CABLING POSITION CONTROL AND INTERLOCKS...- 1 - 1. CABLE TWISTS Polar axis T25-100 Declination axis T25-200 1.1 Principle The cable twists accomodate besides cables, also fle xible

3.6m telescopeMAINTENANCE MANUALNUMBER 6

CABLING POSITIONCONTROLAND INTERLOCKS

Edition July 1977 J. Roozeveld van der Yen-~-----

CONTENTS

1. CABLE TWISTS

1.1 Principle

1.2 Description of parts

1.3 Maintenance

2. HEIDENHAIN POSITION INDICATOR (STRIP ENCODER)

2.1 Principle


2.3 Dismounting of parts

3. ITEK ENCODER

4. HEIDENHAIN BACK UP POSITION INDICATOR

5. SIEMENS POSITION INDICATOR

6. LIMIT, INIT AND POSITION SWITCHES

6.1 Polar Axis

6.2 Declination Axis

7. BALL LIMIT SWITCHES

7.1 Principle

7.2 Adjustment

7.3 Inspection

8. ON/OFF MOTORS CONTROLLED BY MOTOR CONTROL BOXES

(MCB)

Page

1

1

1

3

5

5

6

7

8

8

9

9

9

10

11

11

12

12

13

1. Modes of operation 13

2. Types of motordrive 13

3. Location of MCB's and motors on the telescope 14

9. DESCRIPTION OF MOTOR CONTROL BOXES (MCB)

1. General

2. Standard MCB

3. MCB's for main mirror handling

4. MCB's for platform drive motors

10. MODES OF MANUAL MOTOR COMMAND (OFF LINE)

1. By MCB

2. By Remote Control Handset

3. By portable handdrive box

4. Remotely from the control room

15

15

15

17

18

19

19

19

20

21

11. STANDARD JUNCTION BOXES AND MOTOR CONNECTIONS 21

12. THE INTERLOCK SYSTEMS 21

1. General

2. Motor Control Box safety interlocks

3. Principle of the MCB interlock circuit

4. The Interlock Panel

13. LIST OF COMMON ABBREVIATIONS AND EXPRESSIONS

21

22

23

23

25

Nr. Control Manual

14. LIST OF CONTROL MOTORS, MCB SWITCHED

15. LIST OF MCB's, FUNCTIONS AND

LOCATIONS

16. LIST OF JUNCTION BOXES

17. DESCRIPTION OF INTERLOCK SIGNALS

18. LIST OF INTERLOCK DATA

(3b. 6)

(3b.5)

(3b. 8)

(4a.4.4)

(4a.4.3)

page

27

30

34

36

42

- 1 -

1. CABLE TWISTS

Polar axis T25-100Declination axis T25-200

1.1 Principle

The cable twists accomodate besides cables, also fle

xible tubes for oil, water and air. They allow rotation

of the telescope without damage to cables and tubes. The

main part is the cage, consisting of parallel steel

tubes, welded to steel rings. At the inner diameter of

these rings are located the same number of rings or discs.

These parts can rotate or move on ball bearings. At the

polar axis the cage is fixed to the rotating structure

and at the declination axis to the centerpiece. At the

opposite side, there is a moment arm, which, at the

polar axis connects the ring to the pedestal. At the de

clination axis the moment arm connects the ring to the

polar axis structure. Cables and tubes are supported, or

fixed, to the rings. Moreover, there are three steel

cables to avoid pulling forces from the stabilising

springs in cables and tubes. The tubes at one of their

ends are provided with rotating joints.


1.2.1 ~~g~

Polar axis T25-101Declination axis T25-201

The principle of both cages is similar. Each

ring locates 3 ball bearings. Two of them have a fixed

position, the third one is spring loaded to eliminate

clearance. The rotation axis of the bearings in one of

the end rings is in tangential, that of the others axial

- 2 -

direction.

When fitted inside the telescope, both cages

are supported on two rings.

1.2.2 ~~~~~~_9~2£_~2~Y

Polar axis T25-102

Inside this part are located 21 cables, 1

flexible oil tube, 2 flexible water tubes and one air

tube. Three steel cables are fitted to take the pulling

forces, that result from the 3 compression springs.

These have a stabilisation function.

The flexible tubes are supported in a mecha

nism, that can rotate in 2 ball bearings. On this part

is screwed a rotating union, make Deublin. At the peri

phery, there is a track for the three ball bearings, that

allows only rotation but no axial translation.

Q~~~E_~~e!~_E~~g_~22Y

Declination axis T25-202

Inside this part are located 18 cables, 20

flexible water tubes and one flexible air tube. The

construction is similar to that of the polar axis.

1.2.3 !~~~E~~9~~~~_9~2~_~22Y / Polar axis T25-103

!~~~E~~9~~~~_~~e!~_E~~g_~~2Y/ Declination axisT25-203

The construction of both rings is similar.

Tubes and cables are not clamped, but only supported. At

the periphery there is a track for 3 ball bearings that

allow rotation and axial translation.

- 3 -

1.2.4 ~~E_9~~~_~~~Y / Polar axis T25-104

~~~~E_~~e!~_E~~g_~~~y / Declination axis T25-204

The construction of both rings is similar.

Tubes and cables are clamped. At the outside there is a

track for the three ball bearings, that allow only axial

translation.

1.2.5 Moment arm

T25-105 Polar axis / T25-205 Declination axis

The moment arms are of a similar construction.

It consists of a steel tube with at both ends spherical

units, make Unibal. Length adjustment can be done by

right- and left hand thread.

Make Deublin

Air Type 1300-82 air, rotor 1300-04

Water Type 055-80 water, rotor 055-94

Oil Type 20 oil, rotor 20-3A

1.3 Maintenance

1 x pro month

Inspection, cleaning and greasing by demounting the

unit of :

- greasing ball bearings

- cleaning and greasing of ball bearing tracks 1 x

- inspection tubes and cables pro 5 years.

- 4 -

- inspection rotating unions

1.4 Dismounting arid mounting procedure

Polar axis cable twist T25-l00

- disconnect cables and tubes

- dismount connection screws of part T25-101-10

- screw on "arm for alpha cable coil" T28-116 to

the cage at side V-beam

- take out screws of part T25-101-11

- lift the cable twist care-

fully backward by 12 t

crane

mounting in opposite direc

tion

fig. 1.4

1.5 Dismounting and mounting the declination axis

cable twist T 25-200

- disconnect cables and

tubes

- use "arm for delta cable

coil T28-115

- take out connection

screws between cage

and declination axis

- move the cable twist

out carefully Fig. 1.5

- 5 -

2. HEIDENHAIN POSITION INDICATOR (Strip encoder) T22-100

2.1 Principle (Creusot Loire drawings T22-02/T22-10)

On each of the telescope axes is mounted a strip en

coder make Heidenhain, Type Lida 55.123.

The main parts of each of the encoders are

- a precise linear coded strip, fixed at the peri

phery of a steel drum, that is screwed to the

telescope axis.

- a photo electric sensing head.

- a small carriage on which is mounted the sensing

head that runs over precise machined tracks on the

periphery of the steel drum. Tracks and strip loca

tion are machined with the same machine fixation

to guarantee an optimum concentricity, necessary

to keep the sensing head within a narrow tolerated

distance from the strip. The carriage is pressed on

its tracks by 2 springs and aXially fixed by a

small moment arm. The steel drum outside is pro

tected by a steel cover, that is provided with

several inspection holes. It is supported with 12

ball bearings on the steel drum. The cover is

connected by a moment arm to the structure to pre

vent rotation.

The resolution of the strip encoder at the polar

axis is 2 seconds of arc and at the declination

axis 3.05 seconds of arc. The resolutions are

reverse proportional to the drum diameters.

- 6 -


The carriages at both telescope axes are the

same. The frame is a machined steel structure. It runs

on 5 ball bearings, 3 of them for radial and 2 for axial

location. The radial bearings are mounted on excenter

shafts for adjustment. The sensing head is screwed to

the frame by means of a support. There are locations for

two compression springs that press the carriage on its

tracks. The spring force can be adjusted by a'screw

spindle and pushes the carriage at the same time to the

radial and axial tracks. At the end of the carriage,

there is made a provision for the fixation of a moment

arm. At the side of the sensing head there is an oval

hole in the carriage frame for adjustment of the sensing

head.

The drum is provided with two tracks for the

radial rollers and one for the axial. The strip is lo

cated in between them. The relative excentricity is

restricted to keep the maximum distance of the sensing

head to the strip within 0,1 of a mm. The tracks are

stainless steel rings, welded to the drum. The diameter

of the polar axis strip is 2'060 mm, and at the decli

nation axis 1'350 mm.

Is machined from high tensile steel. Twb

flexible regions with a diameter of 2 mm are machined

- 7 -

in t~,e, arm to obtain some flexibility" ,This is necessary

to absorb relative movements betwee~ q~um~a~d pedestal.

The fixation to the carriage is done with a cylindrical

part that allows axial adjusting. At the other end is a

spherical end that admits some angular adjustment during

mounting,. After adjusting the sphere will be blocked by

four M6 screws.

2.3 Dismounting of parts

- Disconnect cable.

- Dismount the sensing head by 3 screws M6.l6

from the carriage frame (take care to replace

eventual 'shims correctly when mounting agai~.

- Slacken 4 screws M3.l2 that fix the moment arm

to the carriage.

- Take out 4 screws M8.25, but take care to

support at the same time part 22-07-08 not to

overstress the moment arm.

- 'Move out carefully the moment arm in axial

direction.

- Unscrew the spindles for the compression

spr1ngs, and take them out.

- Remove the carriage.

2.3.2 QE~~_E~!~E_~~!~ (After dismounting of the carriage

and switches)

- Take out the moment a,rm.

- Dismount top C0ver T22-02~03.

- Dismount drum support for cables.

- Dismount steel protection, that can be split

into two parts.

- 8 -

For dismounting the drum the "T" shaped tool has to

be used and the 12 t crane.

Fig. 2.3.2

2.3.3 Drum declination axis (after dismounting of the---------------------carriage and switches)

Dismount the protection cover with help of a

non metallic sling through the inspection holes. Take

care not to touch the coded strip. After this the drum

can be dismounted with non metallic slings.

3. ITER ENCODER *) (Wayne-George RI l8/~5 (c) - QPZ)

This rotary incremental encoder has a shaft resolution

of 18 bits, which corresponds to about 5 seconds of arc. The

resolution in each telescope axis is increased by a factor

100 by a precise friction roller, that is driven by an inter

nal ground surface on the periphery of the large gearwheel

and increasing the resolution on the telescope axis to 0.05

seconds of arc.

4. HEIDENHAIN BACK UP POSITION INDICATOR *)

(Encoder type Rod 1/45.7 with 72000 inc./rev.)

This incremental rotary encoder is driven by one of

the backlash free pinions, engaging the large gearwheel, that

- 9 -

gives a step up ratio of 1 in 18 increasing the resolution

on the telescope axes to 1 second of arc.

5. SIEMENS POSITION INDICATOR *)

(Encoder type V23463-KOIOI-Dl13)

This absolute rotary encoder is driven by one of the

backlash free pinions, that engages the large gearwheel, that

gives a step up ratio of 1 in 18. The encoder itself is

internally provided ~ith a 1 in 10 speed reducer , that gives

the encoder a range of la 000 steps in la revolutions, resul

ting in a resolution on the telescope axis of 1.2 minute of

arc.

*) See also maintenance manual Nr. 2

6. LIMIT, INIT AND POSITION SWITCHES

6.1 Polar axis (T22-02)

The switches, make Bosch, are mounted inside a steel

protection. The drum is provided with 6 cam locations.

The carns are fixed with several clamps and can be shif

ted easily.

The switch positions are indicated on the above men

tioned drawing and correspond to the following functions

- Indication East-West

- Indication of the 12 Hr. position for initialising

purposes. (more practical to do it with the

Siemens encoder).

- 10 -

- Limitation of the rotation to + and - 1000

from the 12 Hr position.

- Limitation of the rotation to + and - 1050

from the 12 Hr position only in Off line mode.

In this mode the software limitswitch is eli

minated and replaced by this hardware limit

switch.

Normally the hardware limitswitches will not be tripped.

Only when the software limitswitch fails, this will

occur. In that case the telescope only can be turned

back when in the off line mode. In case that the 105 0

limit switch is tripped, the telescope only can be turned

back manually. In both cases the telescope will.be stopped

by brake directly.

6.2 Limit, init and position switches, declination axis

(T22-l0)

The position and make of the switches is similar to

that of the polar axis. The drum is provided with 8

camlocations. SWitchpositions are indicated on the

above drawing and correspond to the following functions

- Limitation of rotation to +80 0 and -150 0

- Limitation of rotation to +850 and -1550 only

in off line mode for the same reason as at

the polar axis.

- Indication horizontal position for top unit

exchange (more practical to do it with the

Siemens encoder).

- Indication vertical position, to allow

switching off of the radial airpads of the

main mirror.

- 11 -

- Indication pole position, to come out of the

ball limitswitch lock.

- Indication equator for intialising purposes

(more practical to do it with the Siemens

absolute encoder).

- Limitation to go 10 under the horizon, during

top unit exchange (only in 12 Hr position) .

7. BALL LIMIT SWITCHES T22-01

The three ball limit switches are mounted on an adjus

table frame, that is fitted to the centerpiece.

7.1 Principle

The main components of the limitswitches are :

- A stainless steel cylindrical part, for each

switch provided with a different internal cone of

150, 70 and 60 •

- A steel ball with diameter of 50 mm.

- Two inductive sensors.

The cones are filled with oil to damp the ball move

ment.

When the telescope tube nears any position smaller

than 150 above the horizon, the ball inside the 150

cone starts rolling over its slope.

The output of both sensors are combined logically

and generate a fail to safe signal. In this case the

slewing speed will be reduced automatically.

After 70 above the horizon the airclamps of the main

mirror are switched on. This allows the main mirror to

be safely tilted through its fully vertical position.

- 12 -

At 60 above the horizon the telescope will be stopped

(with the exception during top unit exchange in the 12

Hr. position).

To come out of the ball limitswitch lock, it is neces

sary to get the authorization of a responsable electronic.

In that case the following has to be done :

1) Press key on rearpanel of central interlock (in

control room)

2) ~ axis then will be activated

3) Turn ~axis in analog mode into pole direction

by handset (in contrd room)

4) Release key on rearpanel

7.2 Adjusting parallel to the tube axis

The frame consists of two parts, one screwed to the

centerpiece and the other fixed to. it by 3 adjustable

screws. These screws allow rotation about 2 axes per

pendicular to the tube axis.

7.3 Inspection

If necessary the ball switch can be opened by dis

mounting the cover. The best way to do this is in the

vertical telescope tube position, to unscrew the bottom

sensor and the M6 deairating screw, to get the oil out

and to clean the inner part of the cone.

For checking the sensors these can be screwed out

and replaced. Care has to be taken to degrease before

mounting the threads and put loctite or fluid packing

on it for oil tightness. The axial position of the sen

sors should be in such a way that the ball cannot touch

these. The face of the sensor therefore has to be re

cessed 1 mm.

- 13 -

8. ON/OFF MOTORS CONTROLLED BY MOTOR CONTROL BOXES (MCB)

For more details is refered to 3.6 m Control Manuals,

Part 1 and 2. Several Figures and lists are taken from these

manuals. They are provided with a new number. The numbers of

the manuals are put between brackets.

8.1 Modes of operation

The normal operation is via computer (On line) and

MCB. Several other modes of manual operation (Off line)

via MCB are possible either locally or remotely, allo

wing emergency action to be taken on the spot, routine

operational maintenance etc. and remote manual control

from the control room in event of computer failure. More

over it is possible to control a single motor directly

with the Portable Handrive Box, by passing the MCB and

its interlocks.

8.2 Types of motor drive

There are different ~ypes of motor drive

- motors with gear reduction

- motors with gear reduction and brake

- motors with gear reduction in line with clutch

in between

- linear action motors

When any intermediate position needs to be measured

then an aboslute digital encoder has been mounted. If a

limited number of intermediate positions has to be

indicated, additional switches are fitted.

All motors are three phase 380 volt star connected.

Their power consumption varies between 0,05 KW and 0,45

KW, exception case of the platform drive system where

0,9 motors are used and at the main mirror line where

a 3 KW motor is used.

- 14 -

8.3 Location of MCB's and motors on the telescope

(Refer to Figs. 8.3-1, -2 and -3)

Figs. 8.3-1 and 8.3-2 show the location of the various

motors and their control boxes on the telescope. All motor

control boxes, junction boxes and motors are identified by

a code which describes their general location and grouping

on the telescope.

The first symbol of all identifying codes is a single

letter which describes the general location as follows : -

A - Aluminizing plant

C - Cassegrain area

D - Dome

F - Fourth floor (Coude floor and hydraulic plant)

G - Gear drive servos (alpha and delta)

H - Hubsection (center section)

M - Mounting

P - Platform

Q - Observing floor

R - Readings (alpha and delta)

U - Top units

The first numerical digit, which follows immediately

after the single letter, is used to descripe different groups

or subassemblies in the same general location. Fig. 8.3-3

shows some examples of the use of this code. Motor control

box MCBHl is located on the hubsection (letter code H) and is

a member of subassembly group 1. Motors Hll and H12 are also

members of subassembly group 1 as the digit which immediately

follows the letter code is a 1. The second and last digits

refer to the numbering of the individual motors.

Junction boxes are similarly identified by a letter J

which is always inserted between the two digits to denote a

junction box. The identification of cables is similar.

- 15 -

9. DESCRIPTION OF MOTOR CONTROL BOXES (M.C.B.)

9.1 General

Each M.C.B. acts as a central grouping point to re

ceive command signals and generate control signals for

several motors.

Although there are minor variations in some of the

M.C.B.'s, all of them are based on a standard motor

control circuit and constructional layout.

Standard M.C.B. 's contain all motor control relays,

interlock protection circuits, computer command inter

faces and manual control facilities for the control of

up to 7 motors (M.C.B 8) and 4 motors (M.C.B. 4). Built

in indicator lights allow visual monitoring of the

control status of each motor.

Modified control boxes are used for the control of

the main mirror carriages (M.C.B. Ql, M.C.B.A) and the

platform drivesystem (M.C.B. Pl).

A special control system is used for controlling the

dome rotation and opening of the hatches. This was

necessary because the transmission of the numerous

control signals to the dome and hatches is wired through

a limited number of slip rings.

9.2 Standard Motor Control Boxes MCB8 and MCB4,

Figs. 9.2-1, -2, -3, -4

The standard MCB's are constructed from steel sheets

with hinged and lockable front doors. The outside di

mensions of the MCB8 are 400 x 400 x 180 mm, that of the

MCB4, 400 x 200 x 180 mm. Figures 9.2-1, -2 and -3 give

a view of the standard MCB.

- 16 -

The construction of the unit is divided into two se

parate parts. All 380 volt, 3 phase wiring, including

motor protection circuit-breakers, Rl/R2 motor control

relays and general interlock B relays, are mounted on

the backplate, Fig. 9.2-4. All 24 volt wiring,

computer control, local remote control circuits and

interlock system, are mounted inside the hinged module

directly behind the frontdoor. This module is normally

held firmly against the rearface of the frontdoor with

permanent magnet clamps. By pUlling the module body

outwards, away from the frontdoor, access is obtained

to the rear of the module. All of the 24 volt control

components are accessible through the rear. A single

large printed circUt inside the module frame carries all

of the 24 volt control components. On Fig. 9.2-3 a

sample is given of a printed circuit for the Coude

Top Unit.

For manual electrical command only the connectors

which are used for interface signals are of importance.

On the left handside are located 6 Hirschmann sockets,

each with 16 female pole connections and on the right

hand panel 1 similar Hirschmann socket. The sockets are

numbered from I to 7. The connectors for internal inter

connection are mounted on the main printed circuit

board inside the hinged module. The Hirschmann sockets

make the connection to the junction boxes via type H3

cable. The other Hirschmann socket at the right hand

side has 16 male pole connections and carries the 3

phase 380 volt power supply into the unit. Two Hughes

88 pole sockets are positioned at the top of the right

handside panel. They carry all the computer command

signals to the MCB and the status signals from the MCB

to the RIOS computer interface.

- 17 -

9.3 Motor control boxes for main mirror handling

MCBQl and MCBA

These MCB's of special design are installed on the

main mirror top carriage MCBQl and bottom carriage MCBA.

These carriages are provided to allow the main mirror to

be removed from the telescope and transported to the

aluminising plant on the basement floor. Control can

only be done by manual pushbuttons on the front door of

each MCB.

MCBQl, mounted on the main mirror top carriage may

also be controlled remotely by cable. Three drive motors

have to be controlled, fast and slow and one for the

hoist. Three phase power is supplied to the units by a

spring loaded cable drum, mounted on the carriage. When

running at fast speed an automatic clutch disengages

the slow motor. The hoist motor drives a screw roller

spindle for lifting the main mirror cell. An additional

interlock limit switch F3 is fitted. It cuts off the

power 20 mm before the mirror is being manoeuvred into

or out of its seating. This 20 mm has to be done manu

ally. When motorised lifting can be used, a green light

on the motor control box is illuminated. Three Hirsch

mann sockets, 16 pole female, are provided on the left

handside panel for connection to the motors via plugs

and H3 type cable and junction boxes. A large junction

box QIJl supplies the fast motor, slow motor and clutch.

The small junction box QIJ2 is used for the hoist motor.

A 19 pole Burndy socket on the right handside of the

MCB is provided for the Remote Control Box. This unit

requires no power supply as all its controls and indi

cators are wired directly ~n parallel with their counter

parts in the MCBQl.

- 18 -

MCBA, mounted on the main mirror bottom carriage, is

of similar design as the MCBQl, with exception that there

is no hoist motor and no remote control socket. Two

Hirschmann 16 pole female sockets are provided on the

left handside panel in a similar way as at the MCBQl.

9.4 Motor control boxes MCBPl for the platform drive motors

It is impossible to drive these motors directly by a

standard MCB, because they are too powerful. Control

signal outputs from MCBPl are wired to a BBC cupboard

on the platform. This is equipped with heavy duty motor

contactors, to operate the platform drive motors. The

BBC cupboard is also used to distribute power to the

MCBPl and the four standard MCB's on the carriages.

Command signals ON line (computer) or Off line

(manual) are received in the MCBPl. Fl and F2 limit

switches are fitted at each extreme of the platform's

travel. Four position microswitches are fitted to the

platform, to sense each of the four loading/unloading

positions. They prevent operation of a carriage until

the correct loading position has been reached. The four

positions are also transmitted to MCBPl and connected

to four indication lamps.

Interlocks within MCBPl prevent fast movement of the

platform drive once a carriage has left its fully back

position. To allow close visual inspection of the align

ment, the platform may be driven, at slow speed only by

the remote control handset. For computer control an

absolute position encoder is fitted.

- 19 -

10. MODES OF MANUAL MOTOR COMMAND (OFF LINE)

10.1 By MCB (Fig. 9.2-3 and 10.1)

The Module Front Panel locates pushbuttons with

indications for up to 7 on-off motors. At the right

handside top there is an On/Off-line selector. With

green light, the Off line mode is selected. The 2 x 7

pushbuttons correspond to the indicated motors. Turning

of the motors is only possible when the respective

interlocks are fulfilled. This is made visible with the

square green interlock signal lamps situated between the

red pushbuttons. When this green lamp is not lighted it

is necessary to check why not. For example considering

on printed circuit MCBU4 Coude Mirror (Fig. 9.2-3) the

locking manoeuvre : when the square green interlock

lamp "Lock" is not lighted, one or more of the small

interlock signal lamps 2.3 or 4 are not lighted. A check

then has to be made with help of Chapter 17, "Descrip

tion of the interlock signals". When lamp 2 is not lighted

at f5 is indicated: Unit locked to carriage. Locking

to the telescope then is impossible. When lamp 3 is not

lighted, see gl that indicates : Coude mirror cover

closed etc. Locking can be done when interlocks f5, gl

and dl are fulfilled. In chapter 18, "List of Interlock

Signal Data", further information is given.

10.2 By Remote Control Handset (Fig. 10.2)

The R.C.H. can be applied with all MCB's, by plugging

the 48 pole Burndy socket in the front door. The push

buttons are in the same configuration as that of the

Module Front Panel, (but without indication). In prac

tice the indication of the Module Front Panel has to be

noted and put on the R.C.H. Operation then will be

the same as directly with the MCB.

- 20 -

10.3 By Portable Handdrive Box (Fig. 10.3)

The motors, with their limit switches, are wired to

a junction box close to the motor. A 16 pole Hirschmann

socket on each junction box connects it via plugs and

H3 type cable to the MCB. With the Portable Handdrive

Box it is possible to operate a motor directly, bypassing

the MCB and its interlocks. This allows direct

on the spot operation of any single motor in emergency

or for maintenance. The Portable Handdrive Box is

equipped with an input supply lead which must be plugged

into a 380 volt, 3 phase supply socket. The 16 pole

Hirschmann socket with H3 type cable from the junction

box, has to be connected to the Portable Handdrive Box.

When the mechanism reaches the full extend of its travel

in either direction, the appropriate normally closed

limitswitch is tripped and an indicator light is illu

minated (Fl and F2). The supply ~o the motor is then

removed until the opposite direction of travel is selec

ted by the three position switch. Attention has to be

given that besides this protection, theIE are no general

interlocks, that f.i. are available when driving from

the MCB, Remote Control Handset o~ Control Room.

When a twospeed motordrive is to be controlled by the

Portable Handdrive Box, each motor must be controlled

individually. Two 16 pole Hirschmann sockets for that

reason are provided on the junction box. When the fast

motor is to be used, the clutch separating the two

motors must be disengaged with another switch on the

Portable Handdrive Box.

When linear motors are controlled, the state of the

internal limit contacts F3 and F4 is displayed on. built

in indicator lamps.

- 21 -

10.4 Remotely from the control room

Manual pushbuttons in the control room may also be

used to control an MCB remotely. Cables from the control

room pushbuttons are normally wired to the 48 pole Burndy

socket on the frontdoor of each MCB. Front panels in the

control room racks carry all the pushbuttons and indi

cator lamps which are required to operate each MCB. There

is a separate frontpanel for every two MCB's that are

controlled. Operation is exactly the same as described

for the Remote Control Handset.

11. STANDARD JUNCTION BOXES AND MOTOR CONNECTIONS

All motors, together with connections from their two

limitswitches Fl and F2, ~re wired to a local junction box

close to the motor. There are two sizes of standard junction

boxes, a small size box for connecting to a single motor

and a larger size for connection to two motors. There are

special types for a pair of motors, that are connected for

two speed drive and for linear motors.

Standard junction boxes act only as wiring connection

points for their respective motor and limitswitch cables.

12. THE INTERLOCK SYSTEMS (Fig.' 9.2-4)

12.1 General

Interlocks are necessary to protect the telescope

from damage and to ensure the safety of operating,per

sonnel and are incorporated in both the hardware and

software of the telescope. The software interlocks are

- 22 -

written into the computer programm to duplicate the

function of the hardware interlocks, giving a double

level of protection.

There are two systems of hardware interlocks.

!h~_~2~2E_£2~~E2!_!~~~E!29~§concern the operation ofthe ON/OFF switched motors, which are controlled by

the MCB's.

!h~_~~!~_§~EY29E!Y~_!~~~E~2~~§concern only the servomotors and brakes for the telescope main drives.

Interlocks ensure that proper procedures are followed

during the control of the telescope, during top unit ex

change and when removing certain parts from the telescope

for maintenance purposes. During manual control by MCB,

by Remote Control Handset and from the Control room,

these procedures are carried out automatically. If the

Portable Handdrive Box is used, then there is only

protection by the local Fl, F2 limitswitches.

12.2 Motor Control Box safety interlocks (Figs. 9.2-4,12.2-1

and -2)

The interlock system directly concern the operation

of the motors and their MCB's. The general safety inter

lock system is not constructed as a one piece unit. Every

MCB contains a logic panel which is a part of the inter

lock system. This panel defines the logical conditions

which must be satisfied before a motor is allowed to

operate.

All standard MCB's contain a special relay, the "B"

relay for each motor. This "B" relay must be energized

by the interlock system before the relevant motor can

be operated. A visual indication of the "B" relay. status

is provided. This is a green light positioned between

- 23 -

every pair of control pushbuttons for each motor.

The end positions are determined by Fl and F2 limit

switches which affects the Rl or R2 motor control relays

inside the MCB and the Fl and F2 indicator lights are

illuminated. In many cases the end position is a logical

condition that affects the "B" relays of other motors.

The Fl, F2 signals in that case are retransmitted out

of the MCB as a general safety signal. Movements of the

motor in either direction is controlled by the motor

control relays Rl and R2.

To simplify the distribution of interlock signals

between different parts of the system two distribution

boxes are used. These are labelled Distribution BoX H,

(DBXHl and Distribution BoX F, (DBXF) (Fig. 12.2-2).

As most of the interlock signals are generated by the

Fl F2 limitswitches of the motors, the motor code itself

is used. The code for the interlock signal becomes the

motor code followed by the limitswitch designation. For

example H13F2 is the code for the F2 limit switch signal

from motor H13. The abbreviated code for interlock signal

H13F2 is gl. Its function : M3 locked to arm (Chapter

18, list of Interlock Signal data).

12.3 Principle of the MCB Interlock Circuit (Fig. 9.2-4)

Each motor has an individual chain of interlock contacts

wired to its "B" relay. All three F contacts from other

motors must be closed to energize the "B" relay.

12.4 The interlock panel (Fig. 12.4)

Each standard MCB incorporates a panel which visually

illustrates the logical fuction of each motor. An example

- 24 -

is given in Fig. 12.4 which shows the interlock panel

for MCBHl (Mirror 3 arm). Each of the seven motors

controlled by the MCB is listed in a column on the left

handside. Across the top of the panel a row of twelve

LED indicators provide a visual signal for each of the

interlock conditions. Each relay contact which is used

to build up a motor function is shown on the panel by

a pair of adjacent small sockets. These sockets have a

functional purpose described below. The interlock chain

for each motor runs across the panel horizontally, from

right to left, and is drawn to represent the motor func

tion. The beginning of the chain, on the right, is the

point at which the 24 volt supply enters each chain. The

end of the chain on the left is the point to which each

"B" relay is connected.

Many motors such as HIS have a simple function which

is wired with a series chain of a few contacts. Other

motors have more complicated logical functions. The

interlock panel, together with the LED's, gives an

immediate representation of each motor's logical func

tion. The interlock panel also has a functional purpose.

Each pair of adjacent small sockets represents a relay

contact, but in practice they are also wired in parallel

with the actual relay contacts themselves. This allows

jumper link to be manually inserted across any interlock

contact to bypass it. This facility is provided in case

a fault develops in the wiring or source of an interlock

signal.

The insertion of these jumper links is a temporary

measure and never should be done by any mechanic without

a special authorisation of the responsable electronic.

- 25 -

13. LIST OF COMMON ABBREVIATIONS AND EXPRESSIONS

al •.••. Val

B19, B28, B48

All •••.• U4 7

B Relay

C Relay

R Relay

H6, H16

HGS 88

H3 cable

DBXH, DBXF

Fl I F2 relays

F3 I F4

Interlock

Interface

Display

Interlock signals

Burndy 19, 28 and 48 pole connector

Motor designation

General Interlock Relay

Computer interface

Motor Control Relay

Hirschmann 6 and 16 pole connector

Hughes 88 pole connector

Special cable with screened centersection

carrying 5 x 1 mm2 conductors for 3 phase

power lines and outersection of 11 x 0,4

mm2 conductors for 24 volt connectors

Distribution Boxes

Limitswitches

Intermediate switches

A device activated by the operation of

some other device with which it is directly

associated to govern succeeding operations

of the same or allied devices

Internal connection between two systems

A device used for the indication and

quantitative evaluation of computation

results

Monitoring element A device that converts the output quantity

into a signal

On line Computer controlled

Off line

MCB

JBX

Remote Control

RIOS

L.E.D.

CBR2

Hardware

Software

Logic

- 26 -

Manual controlled

Motor Control Box

Junction Box

Control of an operation from a distance

Remote Input Output Station

Light Emitting Diodes

Ball limit switch

The mechanical magnetic electrical and

electronic devices from which a computer

is constructed.

Instruction sequence for computers

The science that deals with the princi

nl p.~ i'lnd criteria o-F ~.raJJ.n.i tv in thought

and demonstration (Boolean Algebra)

- 27 -

14 (3b.6) LIST OF CONTROL MOTORS (MCB SWITCHED)

MotorDesignation

All

A12

Cll

C12

C13

C14

C15

C21

C22

C23

C24

F47

F48

Hll

H12

H13

H14

HIS

H21

H22

H23

H24

H25

H31

H32

H41

H42

H43

Function

Basement carriage, drive slow

Basement carriage, drive fast

Mirror 3, alignme~t drive 1

Mirror 3, alignment drive 2

Mirror 3, alignment drive 3

Mir+or 3, cover drive

Mirror 3, cover drive

Mirror 3, hook lock on baffle

Sky baffle drive

Mirror 3, power plug drive

Mirror 3, twin lock on baffle

Mirror 5, cover drive

Mirror 5, pivot arm drive

Mirror 3, arm drive slow

Mirror 3, arm dr~ve fast

Mirror 3, lower arm lock

Mirror 3, upper arm lock

Mirror 3 arm lock on hubsection

Counterweight 1, N-E

Counterweight 2, S-E

Counterweight 3, s-wCounterweight 4, N-W

Small horizontal counterweight

Main mirror cover drive

Main mirror cover drive

Top ring fixation 1

Top ring fixation 2

Top ring fixation 3

./ .

ControlMCB

MCBA

MCBA

MCBCl

MCBCl

MCBCl

MCBCl

MCBCl

MCBHl

MCBCl

MCBCl

MCBHl

MCBFl

MCBFl

MCBHl

MCBHl

MCBHl

MCBHl

MCBHl

MCBH2

MCBH2

MCBH2

MCBH2

MCBH2

MCBH2

MCBH2

MCBH3

.f.1CBH3

MCBH3

14 (3b.6)(Continued)

- 28 -

MotorFunction Control

Designation MCB

H44 Top ring fixation 4 MCBH3

Mll Mirror 4, alignment drive 1 MCBMl..M12 Mirror 4, alignment drive 2 MCBHl

M13 Mirror 4, alignment drive 3 MCBMl

M14 lUrror 4 cover drive MCBMl

M2l Pol~r counterweight MCBMl

M3l Declination lock drive MCBMl

Pll Platform drive 1 fast MCBPl

P12 Platform drive 1 slow MCBPl

P13 Platform drive 2 fast MCBPl

P14 Platform drive 2 slow MCBPl

P2l Carriage 3, drive slow MCBP2

P22 Carriage 3, drive fast MCBP2

P23 Carriage 3, lock top-unit in MCBP2,

P24 Carriage 3, rear lift MCBP2

P25 Carriage 3, front lift MCBP2



P33 Carriage 4 , lock top-unit in MCBP3


P35 Carriage 4, front lift MCBP3



P43 Carriage 1, lock top-unit in MCBP4


P4S Carriage 1, front lift MCBP4

PSl Carriage 2 drive MCBPS

P52 Carriage 2 lift MCBP5

./ .

14 (3b.6) (Continued)

MotorDesignation

- 29 -

Function ControlMCB

Qll Mirror top carriage, drive slow MCBQl

Q12 Mirror top carriage, drive fast MCBQl

Q13 Mirror top carriage, lift MCBQl

Q2l Polar lock drive MCBFl

Ull Prime focus, lock to telescope MCBUl

U12 Prime focus, lock to telescope MCBUl

U2l Prime focus, cage turn MCBUl

U22 Prime focus, chair drive MCBUl

U3l Cassegrain mirror, colI. drive MCBU3

U32 Cassegrain mirror, colI. drive MCBU3

U33 Cassegrain mirror, focus slow MCBU3

U34 Cassegrain mirror, focus fast MCBU3

U35 Cassegrain mirror, lock MCBU3

U36 Cassegrain mirror, lock MCBU3

U37 Cassegrain mirro~, cover drive MCBU3

U4l Coud~ mirrorl, colI. drive MCBU4

U42 Coud~ mirroxz, coll. drive MCBU4

U43 Coud~ mirron, focus slow MCBU4

U44 Coud~ mirrorl, focus fast MCBU4

U45 Coud~ mirror~, lock MCBU4

U46 Coud~ mirroIl, lock MCBU4

U47 Coud6 mirroD, co.ver drive MCBU4

- 30 -

15 (3b.5) LIST OF MCB's, THEIR FUNCTIONS AND LOCATIONS

Desig. Nr. of spare Function Locationmotors controls

MCBA* 2 All = Carriage drive slow Main mirrorAl2 = Carriage drive fast bottom carriag

MCBCl 7 0 Cll = Mirror 3 alignment drive Center pieceCl2 = Mirror 3 alignment driveCl3 = Mirror 3 alignment drive

I

C14 = Mirror 3 cover

ClS = Mirror 3 cover

C22 = Sky baffle drive

C23 = Mirror 3 power plug

MCBFI 3 4 F47 = Mirror 5 cover Fourth floorF48 = Mirror 5 arm drive

021 = Alpha lock drive

MCBHl 7 0 Hll = Mirror 3 arm drive slow Center piece

H12 = Mirror 3 arm drive fast

H13 = Mirror 3 lock to arm (lower)

Hl4 = Mirror 3 lock to arm (upper)

HIS = Mirror 3 arm lock on hubsect.

C2l = Mirr. 3' hook lock on sky baf.

C24 = Mirr. 3 twin lock on sky baf.,

MCBH2 7 0 H2l = Vertical counterw. N-E Center piece

H22 = Vertical counterw. S-E

H23 = Vertical counterw. s-wH24 = Vertical counterw. N-WH25 = Small horizont. counterw.

H3l/H32 = Main mirror cover, ./ .HSl = Contacts only for top units


- 31 -

-Desig. Nr. of spare Function Location

motors controls

-MCBH3 4 3 H4l = Top ring fixation Center piece

,"

H42 = Top ring fixation



.MCBMl 6 1 Mll = Mirror 4 alignment drive Mounting

Ml2 I: Mirror 4 alignment drive

Ml3 = Mirror 4 alignment drive

Ml4 = Mirror 4 cover

M2l = Polar counterweight

M3l = Delta lock drive

I

MCBP1* 2 0 P1l/13 = Platform drive slow Platform

P12/14 = Platform drive fast

W''SP2 5 2 P21 = Carriage 2 drive slow Carriage 2

P22 = Carriage 2 drive fast

P23 = Lock unit on carriage

P24 = Rear lift

P25 = Front lift

MCBP3 5 2 P31 = Carriage 4 drive slow Carriage 4

P32 = Carriage 4 drive fast


P34 = Rear lift

P35 = Front lift

. I .

- 32 -


nit

un!1

Desig. Nr. of Spare Function LocationMotors controls

MCBP4 5 2 P4l = Carriage 1 drive slow Carriage 1P42 = Carriage 1 drive fast


P44 = Rear lift

P45 = Front liftI

MCBP5 2 2 P51 = Carriage 2 drive Carriage 2

P52 Cl Carriage 2 lift.

MCBQl* 3 011 = Carriage drive slow Main mirror

Q12 1:1 Carriage drive fast top carriage

013 1:1 Lift drive.MCBUl 3 1 Ull/Ul2 Cl Prime focus unit lock Prime focus u

U21 III Prime focus cage chair turn

U22 = Prime focus cage chair drive

MCBU3 6 1 U31 1:1 Cassegr. mirror collimator Cass. mirror

U32 = Casse~r. mirror collimator

U33 1:1 Cassegr. mirror focus slow

U34 1:1 Cassegr. mirror focus fast

U35/U36 = Cassegr. mirr. unit lock

U37 = Cassegr. mirror cover

./ .

- 33 -


t

Desig. Nr. of spare Function LocationMotors controls

MCBU4 6 1 U4l = Coud~ mirror collimator Coud~ mirror uni

U42 = Coud~ mirror collimator

U43 = Coud~ mirror focus slow

l)44 = Coud~ mirror focus fast

U45/U46 = Couda'mirror unit lock

U47 = Coud~ mirror cover

* Special MCB's, refer to relevant section: -

(MCBA)

(MCBP1)

(MCBQ1)

- 3b.3,4

- 3b.4.5

- 3b.3.3} 3.6 m Control Manual Part 2

- 34 -

16 (3b.8) LIST OF JUNCTION BOXES

MOTOR (S) JUNCTION BOX E.S.O No. DWG. No.DESIGNATION

All, A12 A1J1 M-0431-l V .4.1

C1l to C15 *1 see note

C2l, C22 C2J1 E-0706-3 V .6.10

C23 C2J2 M-0333-1 V .6.4.'

C24 C2J3 E-0706-2 V .6.6

F47 F4J3 M-0511-2

F48 F4J1 M-0333-l V .6.4

Hll, Hl2 H1J1 E-0706-1 V .6.9,

HlJ5*2H13 H1J2, M-0334-1 V .6.1

H14 H1J3, H1J5*2 M-0334-1 V .6.1

H15 H1J4 M-0334-1 V .6.1

H21 H2Jl M-0334-l V .6.1

H22 H2J2 M-0334-l V .6.1

H23 H2J3 M-0334-l V .6.1

H24 H2J4 M-0334-1 V .6.1

H25 H2J5· M-0334-1 V .6.1

H31 H3J1 M-0332-1 V .6.2

H41 H4J1 M-0359-1 V .6.3

H42 H4J2 M-0359-1 V.6.3

H43 H4J3 M-0359-1 V .6.3

H44 H4J4 M-0359-1 V .6.3

Ml1, M14 MlJ1 M-0330-l V 6.7

M12, Ml3 MlJ2 M-0330-1 V .6.7

M2l M2Jl M-0334-1 V.6.1

M31 M3Jl M-0359-1 V .6.3

Pll to P14 no junct.box

P21, P22 P2J1 M-0336-1 V .6.13

P23, P24 P2J2 M-0337-1 V.6.l2

./ .

- 35 -


MOTOR(S)JUNCTION BOX E.S.O. No. Dt'JG. No.

DESIGNATION

P25 P2J3 M-0334-1 V .6.1

P31, P32 P3J1 M-0336-1 V .6.13

P33, P34 P3J2 M-0337-1 V .6.12

P35 P3J3 M-0334-1 V.6.1

P41, P42 P4J1 M-0336-1 V .6.13

P43, P44 P4J2 M-0337-1 V .6.12

P45 P4J3 M-0334-1 V .6.1

P51 PSJ1 M-0334-1 V .6.1

P52 P5J2 M-0333-1a v.6.5

011, Q12 Q1J1 M-0431-1 V.4.1

Q13 Q1J2 M-0431-1 V .4.1

021 Q2J1 M-0359-1 V .6.3

U11, U12 U1J1 M-0332-1 V .6.2

U21, U22 U2J1 M-0348-1 v.6.11

U31, U32 U3J1 M-0330-1, V .6.7

U33, U34 U3J2 M-0335-1 V .6.8

U35, U36 U3J3 M-0332-1 V .6.2

U37 U3J4 M-0334-1 V .6.1

U41, U42 U4J1 M-0330-1 V .6.7

U43, U44 U4J2 M-0335-1 V .6.8

U45, U46 U4J3 M-0332-1 V.6.2

U47 U4J4 M-0334-1 V .6.1

*1 _ Motors C11 to C21 are connected to their motor control

boxes via a motorized coupling mechanism. Connections are

made directly via the plugs and sockets and no junction

boxes are required.

*2 _ These junction boxes are wired to their motor control

box (MCBH1) via another junction box (H1J5).

- 36 -

17 (4a.4.4) DESCRIPTION OF THE INTERLOCK SIGNALS

Each interlock signal is identified by its two symbol

code. For the full codes refer to chapter 18, list of InterlockSignal Data.

al, a2, a3, a4 - 'Carriage completely back' - these four inter

lock signals are wired from Fl endswitches on

the top unit carriage drives. Each limit switch

is activated by a cam at the end of the appro

priate carriage rails. The signal is trans

mitted when the carriage has been drawn comple

tely back, away from the telescope tube.

zl - 'All carriages completely back' - this combined

interlock signal is generated in MCBPI using

the four signals listed above, (al.a2.a3.a4).

as, a6, a7, aB - 'Carriage on manual' - these local interlock

signals are only used in the carriage MCB's

where they. are generated. They transmit when

the appropriate carriage has been switched to

manual control and they are wired from the

ON LINE/OFF LINE selector relay.

bl, b2, b3, b4 - 'Carriage in loading/unloading position'

these interlock signals are generated by four

position switches which transmit in each of

the four loading/unloading positions of the

moving platform.

./ .

- 37 -

17 (4a. 4 .4) (Continued)

b5, b6, b7, ba - 'Carriage in fast drive sector' - these

local interlock signals are only used in the

carriage MCB's where they are generated. Each

limit switch follows a cam running alongside

the appropriate, carriage rails. When the

carriage 1s running over the centre section of

rail, clear of both the telescope tube end

and the completely back position, the interlock

signal is transmitted to allow the carriage

to be moved at fast speed.

cl, c2, c3

c4

dl

d2

- 'Top unit misalignment' - these interlock signals

are transmitted by sensor switches within the

top ring when the incoming top unit is not

correctly aligned.

- 'Tube upper misalignment' - this combined inter

lock signal is generated in MCBPl.

- 'Top unit fully in' - thi~ interlock signal is

generated by a sensor switch on the top ring.

The signal transmits when a top unit has been

driven fully into the telescope tube.

- 'Top ring locked' - combined interlock signal

which is generated in MCBH3. It transmits when

all four locks have fUlly engaged to lock the

top ring into the telescope.

./ .

17 (4a.4.4)

- 38 -

(Continued)

d3

el, e2, e3

eS, e6, e7

fl, f2, f3

'Top ring in' - these four local interlock

signals are only used in MCBH3. They ensure

that the top ring is in contact with all four

locks before the top ring is locked to the

telescope.

- 'Forks completely in' - these local interlock

signals are only used in the carriage MCB's

in which they are generated. A push switch on

each carriage transmits a signal when the forks

are fully engaged in the top unit. Each top unit

may only be locked to its respective carriage

after this signal has been transmitted.

- 'Carriage empty' - these local interlock signals

are only used in the carriage MeB's where they

are generated. The forks on each carriage are

fixed using a centre pivot bearing and a rear

spring mounting. When the top unit weight is

taken on the forks the mounting springs de

flect and trigger push switches at the rear

of ~~e carriages. These interlock signals prevent

the front lift motors from operating unless the

top unit is removed,

- 'Unit locked to telescope' - these interlock

signals are generated by F2 endswitches on the

top unit locks. The ~ignals are transmitted

when the appropriate top unit is fully locked

into the telescope tube.

. ./ .

- 39 -

17 (4a.4.4) (Continued)

fS, f6, f7

gl, g2

hI

- 'Unit locked to carriage' - these interlock

signals are generated by F2 endswitches on the

carriage locks. The signals are transmitted

when the appropriate top unit is fully locked

into its carriage.

- 'Mirror cover closed' - these signals are trans

mitted when the covers are fUlly closed to

protect the mirrors.

o- 'Tube above 15 ' - this interlock signal is

generated by a.ball switch in the ball switch

case, CBR2. It is transmitted when the optical

axis of the telescope tube is at an elevationo '

of greater than 15 with respect to the hori-

zon

h2 (tube above 70), h3 (tube above 6

0) - same type of function

as hI but for different elevation angles.

jl, j2, j3, j4

R2lFl to R2lF9

Fl (~) to F9 (cS)

'Telescope tube position' - these interlock

signals are generated by push switches follo-"

wing a cam on the declination axis drive. They

transmit at various different positions of the

telescope tube.

k

RllFl to RllF6

Fl Pl.) to F6 (ol)

- 'Horse-shoe position' - these interlock signals

are generated by push switches folloWing a cam

on the polar axis drive. They transmit at dif

ferent positions of the horse-shoe.

./ .

- 40 -


ml, m2 - 'Telescope tube lock' - Fl, F2 endswitch signals

from the declination axis lock pin.

m3, m4 - 'Telescope tube balanced' - when the telescope

tube is locked there is a small amount of free

side movemovement in the lock pin itself. Two

push switches are positioned on each side of

the lock pin to ensure that the tube is balanced

correctly. The interlock signals are transmitted

unless there is enough unbalance force in either

direction to depress one of the switches.

nI, n2 - 'Horse-shoe lock' - Fl, F2 endswitch signals

from the polar axis lock pin.

n3, n4 - 'Horse-shoe balanced' - same type of function

as m3, m4.

01, 02 - Oil lubrication - interlock signals from oil

pressure switches in the oil supply lines to

the gear drives of the declination and polar

axis. These interlock signals operate in an

inverted manner because the sensors used have

contacts of the normally open type. These

signals transmit when there is insufficient

oil pressure in the supply to the gear drives.

'. / .

- 41 -


03, 04 - Hydrostatic bearing oil pads - combined

interlock signals from the pressure and flow

monitors in the oil supply lines to the decli

nation and polar axis hydrostatic bearings. The

interlock signals transmit when the oil pressure

and flow to their respective bearing pads are

above the minimum required levels.

p1, p2, p3, p4 - Mirror 3 arm signals - these interlock signals

are generated by limit switches on mirror 3

arm. p1 is transmitted when the arm is locked

on the hubsection. p4 and p2 are the F1, F2

endswitch position signals from mirror 3 arm

drive. p3 is trans-

mitted when the arm is not at either end of its

travel, to allow the arm to be moved at fast

speed.

q1 to a6 _ Mirror 3 signals - these interlock signal are

all generated by the Fl, F2 endswitch position

signals of the various motorized mechanisms on

mirror 3.

r1, r2, r3, r4 - 'Emergency switches - these interlock signals

come from manually operated emergency switches

situated at various points on the telescope .

./ .

- 42 -

18 (4a.4.3) LIST OF INTERLOCK SIGNAL DATA

INTERLOCK SIGNAL TYPE SOURCE FUNCTION

al P41Fl EXT. MCBP4 Carriage 1 completely backa2 PSIFl EXT. MCBPS Carriage 2 completely backa3 P21FI EXT. MCBP2 Carriage 3 completely backa4 P31Fl EXT. MCBP3 Carriage 4 completely backzl (al. a2. a3 •a4) COMB. MCBPl All carriages completely back

as OFF line P2 LOCAL MCBP2 Carriage 3 on manuala6 OFF line P3 LOCAL MCBP3 Carriage 4 on manual

a7 OFF line P4 LOCAL MCBP4 Carriage I on manual'

aB OFF line PS LOCAL MCBPS Carriage 2 on manual

pl PISF3 LOCAL MCBPI Carriage 3 loading position

b2 PISF4 LOCAL MCBPI Carriage 4 loading positionb3 PlSFS LOCAL MCBPl Carriage 1 loading positionb4 PISF6 LOCAL MCBPl Carriage 2 loading position.bS P22FI, P22F2 LOCAL MCBP2 Carriage 3 fast drive sectorb6 P32Fl, P32F2 " LOCAL MCBP3 Carriage 4 fast drive sector

b7 P42FI, P42F2 LOCAL MCBP4 Carriage I fast drive sector

bB PS2FI, PS2F2 LOCAL MCBPS 'Carriage 2 fast drive sector

cl HSIFI EXT. MCBH2 No tube west misalignment

c2 HSIF2 EXT. MCBH2 No tube east misalignment

c3 HSIF3 EXT. MCBH2 No tube bottom misalignment

c4 (c1.c2) COMB. MCBPI No tube upper misalignment

dl HSIF4 EXT. MCBH2 Top unit fUlly in

d2 - COMB. MCBH3 Top ring locked

d3 n41F3toH44F3 LOCAL MCBH3 Top ring in.,

./ .

18 (4a. 4.3) (Continued)

- 43 -

INTERLOCK SIGNAL TYPE SOURCE FUNCTION II

el P23F3 LOCAL MCBP2 Carriage 3 forks in

e2 P33F3 LOCAL MCBP3 Carriage 4 forks in

e3 P43F3 LOCAL MCBP4 Carriage 1 forks in

eS P23F4 LOCAL MCBP2 Carriage 3 empty

e6 P33F4 LOCAL MCBP3 Carriage 4 empty

e7 P43F4 LOCAL MCBP4 Carriage 1 empty

.f1 U45F2 EXT. MCBU4 Coude locked to tube

f2 U3SF2 EXT. MCBU3 Cassegrain locked to tube

f3 UIIF2 EXT. MCBUl Prime focus locked to tube

fS P23F2 EXT. MCBP2 Unit locked to carriage 3

f6 P33F2 EXT. MCBP3 Unit locked to carriage 4

f7 P43F2 EXT. MCBP4 Unit locked to carriage 1:

gl U47F2 LOCAL MCBU4 Coude mirror cover closed

g2 U37F2 LOCAL MCBU3 Cassegrain mirr. cover closed

hl R22Fl EXT. CBR2 Tube above lSo

h2 R22F2 EXT. CBR2 Tube above 70

h3 R22F3 EXT. CBR2 Tube above 60

jl R2lF3 EXT. SERVOS Tube vertical

j2 R21F4 EXT. SERVOS Tube horizontal

j3 R21F7 LOCAL SERVOS Tube above horizon

j4 R2lF5 LOCAL SERVOS Tube above pole

Fl (6) R2lFl LOCAL SERVOS Tube limit south

F2 (6) R21F2 LOCAL SERVOS Tube limit north

FG (0) R2lFG LOCAL SERVOS Tube at equator

Fa (0') R21F8 LOCAL SERVOS Tube end stop south

F9(6") R2lF9 LOCAL SERVOS Tube end stop north

./ .


- 44 -


k

Fle..:)

F2(Cll)

F3 (od

F5(~)

F6 (cO

ml

m2

m3

m4

nl

n2

n3

n4

01

02

03

04

pl

p2

p3

p4

RI1F4

RllFl

R1IF2

RllF3

R11F5

RllF6

M31F2

M31Fl

M31F3

M31F4

Q21F2

Q21Fl

Q21F3

Q21F4

G23Fl

G13Fl

H15F2

H11F2

HI1F3

HllFl

EXT.

LOCAL

LOCAL

LOCAL

LOCAL

LOCAL

EXT.

EXT.

LOCAL

LOCAL

EXT.

EXT.

LOCAL

LOCAL

LOCAL

LOCAL

EXT.

EXT.

EXT.

LOCAL

LOCAL

LOCAL

SERVOS

SERVOS

SERVOS

SERVOS

SERVOS

SERVOS

MCBMl

MCBM1

MCBMl

MCBMl

MCBFl

MCBFl

MCBFl

• MCBF1

HYD.*

HYD.*

HYD.*

HYD.*

MCBHl

MCBHl

MCBHl

MCBHl

Horse-shoe at 12 O'clock

Horse-shoe limit east

Horse-shoe limit west

Horse-shoe init. oi

Horse-shoe end stop east

Horse-shoe end stop west

Telescope tube lock in

Telescope tube lock out

Tube balanced +

Tube balanced -

Horse-shoe lock in

Horse-shoe lock out

Horse-shoe balanced +Horse-shoe balanced -

£oil lubrication

~ oil lubrication

b hydrostatic bearings

::.t hydrostatic bearings

M3 arm lock to Hubsection

M3 arm in

M3 arm on fast sector

M3 arm out on hubsection

ql H13F2

q2 C21F2

q3 C14F2, C1SF2

q4 C23Fl

LOCAL

LOCAL

EXT.

EX'I.' •

MCBHl

MCBHl

MCBCl

MCBCl

M3 locked to arm (lower)

M3 hook locked to sky baffle

1-13 cover closed

M3 power plug out

./ .

- 45 -



q5

q6

q7

C24F2

Hl4Fl

C2lF3

EXT.

LOCAL

LOCAL

MCBHl

MCBHl

MCBHl

M3 twin locked to sky baffle

M3 unlocked to arm (upper)

M3 mech. locked to sky baf.

rl emergency SW.

r2 emergency SW.

r3 emergency SW.

r4 emergency SW.

zl (al.a2.a3.a4)

z2 (j2.k.nl.ml )

z3 (z2.cl.c2.c3)

z4 (k.nl)

LOCAL

LOCAL

LOCAL

LOCAL

COMB.

COMB.

COMB.

COMB.

SERVOS

SERVOS

SERVOS•

SERVOS

MCBPl

MCBFl

MCBPl

MCBFl

Prime focus cage emergency

Center section emergency

Cassegrain cage emergency

Platform emergency

tl

t2

t3

t4

Sal

Sa2

Val

Q3lF2

Q31Fl

Q3lF3

Q3lF4

LOCAL

LOCAL

LOCAL

SERVOS

SERVOS

CBR2

These interlock signals are

intended to replace

ml, m2, m3, m4.

Main mirror air support

Main mirror air clamps

HYD.* - These signals are wired in the BBC hydraulic plant,

MCBU

MIRROR 4',

M1', M12M13. M14

fU31' U32, U33, U34.U3S, U36 ,U37U41, U42, UI,3, UI,I"UI,S, U'&,UI,7Ul1, U12, U21) U22,U23

(MIRROO 3: C1l,C12 ,C13. C11, I C1S/ t~KY SAl;: C21 \ C22 , C23

READINGS R2l OBXH

R23

46

Approv,

Niln",:

S - 103

Number:

cs - E - 0654 - 2(rig. 3b.7-A)

Object:

LOCATIONS

ESO

OF ON - OFF MOTORS AND 'SERVOSFIG 8.3-1

EUROPEAN SOUTHERN OBSERVATORV,1211 GENEVA 23

TELESCOPE PROJECT DIVISiON·

..... 1, ..:r,-~ • ." .... ~ rl Y ':.

" ~-'- ~;.-=-- -,

"""" f 1.1-0"1 ""t "; .... u': .. r JIl'. C

., r • ')!: r"\

"

-1-

~. ~'__ SCCUCE

AlJXILIA~V

~\ I TELESC~PE~ ~.

~~:, \~J \\.,\~ , .... \~:'. .\' \ '1.\ •~~

-~~2.-':)~~'L..)::ff~i·- ---.:..... "'--::;"-~I~-··-·-·'

• \' wn ~.~~ : I :,

SYSTEM J j" ~~ \;..!'., 'r.-'~' MC:1-S

COMPUTER-,',· ~4' ·,/l_-<sc;;:-s: III ~ J.i _ I ! ..."; I oax - 5~ ~ C""'-'/

I L! ;.-.~ ..~, .'

,--r-- I iI I :

I 1 '. 1 ~

1

1 I !: .J ! I

l' I

"--

Mirror 5

1= -FOURTH FLOOR/' /V'CD Fl·n I

RIOS FODX F

•. - .- POXFl .·F2 ----

.OIL CONTROLPUMP STATION

'HYDRAULIC PLANT)

~-----.:

D-OOM[;

A - ALUMINIZ'NG PLANT

~-T~UNITSRIDS U3 ""'-RIOS U4

MC~ ~,....®._'"~0 -1:)

"TI-(;)(X)"tAlI

~

popLATFORMRIOS-PMCa -PtMCD""'\ I' I;: -P2·P5

~ -DOM;'" IMCD O! ( 'HATCHES. .' I! \\J< /OS 0' I ':.~/;:)sCR!;EI'lI I ' I I

I U, '. :' ; !' -

I'~~ r'-" ~~.

l·,,:J@0)I, .~I ("'\

r,f

. ~OO~A .;' "C'''',, I:' '../~;dso !~

I,' ~--- ......, 'I. R/CS-O [SV""~TS::vI1 )

48

m=LETTER FOR GENERAL LOCATION

~ Nw·mER OF GROUP (SU8ASSEM8LY)

t ,NUMBER OF MOTOR "

F1o

H11 F2o

Fto

Ht2 F2o

Hll- t Htt-2 Hl'-3 H12-1 H12-2 H12- 3

MOTOR CAN BE CONTROLEDHERE BY THE HAND -DRIVE

H1 J1

LETIERGEN.LOC.

No OF GROUp<I--'

.Jo OF BOX

H3 TYP CABLE,--~MCBH'

H10-2

(

Hl1-4 MAX.7 MOTORSPER BOX

RIOS H

H3 TYPE CABLEHtO-l

MCBH2

MCBH3

MCBC tCBR 2

H20-10'

H30-1

Cl0-1

R20-1

OSXHINTERLOCKS

380V

HOO-2 HOO-t

CS-E-0654-1

(Fig. 3b.7-C)

-~

s- 103Arprov.

.----,...---,------.----------t-'--------Dl'to: tl;Jme: Scalo: Number:I----·I-.-;.....;~-I---...:..~;",;."...-I

Drawn 2. 4. 7& KtU21

Object:

EXAMPLE OF ON-OFF MOTORS CABLING F'IG 8.3-3

C~OI.'t- <,;..; ._

EUROPfAU SOUTHERN OOSI:nVATORY. \211 GI:Nr:VA 23

T r: r r.:'~ f' [" ,,~~ tJ ~.~ (' •p= e""" ~... «"I~ ~ C ..,,r.. i. t:;" 'J v. a- • .. .... to.. J; -.. .... • I .. ' ". ......, .. 'J-_...- ..-~--~ • ...~~,. .~~-:-'t"j _'4.11.. •••• 't.c...-J.....

2 Hughes 88pole sockets tocarry computer signals to MCaand status signals from MCato RIOS computer inter face.

o 0

o 0

sittmcmsD7

o key

Front door

1

4

2

5

3

6

Do

o 0

."_.CO

!DN

I-

Burndy socket - 48 polasfor remote control Handset(normally comccted withControl room).

STANDARD MOTOR CONTROL BOX M.C.B.8

Left side -6 Hirschmam sockets16potes for 6 motors.

Back plate and 380 Vwiring

Front doorFront panel of hinged module

50

Back side offront panel

PHOTOGRAPH OF M.C.B

Fig. 9.2-2

I Collimator Focus IR- Red lightG - Gr~en light

Mol Prot.

ooff line

o

."1O"CDN

I

W

Collimation

Focus sLowFocus fastLock

Cover

IlID [[] rID [ID [Q] lID [ID [Q] [[] []] [[] (]J'U41 U42 U43 U44

J Lock Cover IIlID rID [[] [ID [ID [ID [BJ rnJ IJ[]I

unlock lock open dosed

(small interlock signal lamps)~ ~ ~ ~ 0 0 0 0 0 0 0 0 0.

U45l F£2 L-J-+-----------U41 ~---u:O-f1

U42~----1 : Interlock panel ..U43 : (printed circuit). .U44 U47:F2

U~6 P2d~:~10F447 f5 g1 d

MODULE FRONT PANEL

M.C.B. U4Coude mirror

(11....

+ +

lOCALINTERLOCK

----- F2F1' -----

yF-CONTACTS FROM OTHER MOTORS

3

GENERAL INTERLOCK

Onte: tlamel Scala: Number:Drawn 30.9.16 KLU'u FIG 9.2-4Approv, J!~ S -103

ObJecll( Fig. 4.2.4)PRINCIPLE OF INTERLOCKS

E" SO EUROPEAN· SOUTUERN OOSERVAYOICY,121t GENE~A 23

TELESCOPE PROJECT DIVISION

53

From Control Room-MeB

'- '''''----IRemote-Control__----. .Hgndset

~--1"""- To MCB HI' -H2.- H ,

CBR2.- UI.-(U3).- U~)

f, F 2

l'3)~i-@-t{( '.)JBX

'-) 1-~-~-?-rli~-eJ-------jO=380 v

To max 7 motors

CommandRIOSH

"'---4(RIOS U)~_~_-1Status

220v

220v

r-----

380 v

1-----1(omputer

DBX H

) ( & Cable Twist

) C:' Cable TWist

IIITo servos for I

eC+& axes I

I

IIL- .....l

CONTROL ROOM

DBX F

r------------------.I MCB

1---~~-1 PI

II '----I on carriages

ONPlATFORM=7--------~

GENERAL PRINCIPLE OF ON/OFFMOTOR COMMAND

Fig. 10.1

54

dy 48 pin

~-

Burn

II0 0 0 0

ICIJCDCIJ ITJIJ t

0 0 0 0

Ic::oCDD:JI1 ~ 1

"'"'"ON/OFF line selection

REMOTE CONTROL HANDSET

Fig. 10.2

~O

~O

Li'O

tr"O z(')lteye

S"0

0,....-

00

----

~0)

w>-a::Cl

I

ClZ«J:

w..Jm~a::oa.

Fig. 10.3-1

OJ

56

H~~IOl t: LOCAL+ HfM. L~C. + ++ +

! ~I! ! ! b ,! ~F1 I~~ COMPUTER

"~L~. ... COMPUTER " f2• \', \COMMAND ~ ,.l

:ND L I.:I"DWITCH SWITCH

LEFT

~TO Gt::NERAL

INTERLOCK CIRCUIT

+

COMPUT. STATUSF1 TO MOTOR

~

F2

+

/'7 ~ ~ ~q R

-tlr--~-1=t--+-{::==i.:n=I---,=;~~ M®PR~T~CT. (ONE LAMP PER Mesl

~LAYOUT OF CONTROL LAMPS

AND BUTTONS

FROM GENERALINTERLOCI< -e.--_

Dalo:

Drewn 13.9. 7G

Approv.

Namo:

S -103

Number:

FIG 12.2-1

Object:

PRINCIPLE OF A MOTOR CONTROL (Fig. 4.2.2.)'

ESOEUROPEAN SOUTIIERN ODSERVATORY.1211 GENEVA 23.TELESCOPE PROJECT D~V;S~O'~',,~

57

IO~u:Ell.

CDIJ1ull.~

~00

m Ncc

Ull. ~ ...J

~ 0cc....z0

~ m:- U

n: u M0 ::Ea. ;.-u.I- Ol/)<! >::.:::...J ccua. CD wet

u- ~ l/)a::iD.

I, I

x- ><_M~ (J)::>::>::> 0 r--

.... '--.,--J

Z IT]::> mMCl. Ux i>-0 ::E....

CONU xtu :::EUIJJa: N

a: 0::(X)

~ uzwu cou-.... u-

ID ..Ux::E

Dalo: Namo:Drawn 26. 1. 77 'c<Ll.R.tAApprov.

~ 1'-./ CL,,~- '-../

.... " U.,,'h' ><,.-.... ·tI a:,.-...., CD 0

l- D 9l/) ....~

l/) u.~.... .... :c....

0:t.' ::>z 0t= m_ u.

CDz u u-::> ~~ ~LL0::t:

NUlnber:

FIG 12.2-25-103

ObJoct:

(FIG 4.1.2)

ESO

LAYOUT OF THE INTERLOct< CABLH\!G

EunOPEAN SOUTHERN OUSERVATORY, 1211 GEUEVA 23

TELESCOPE PROJECT D~V!Sldr-J

o o o ® ~ o @ o @ ® o ®

1 2 3 4 5 6 7 8 9 10 11 12

Arm drive slow

km drive fast

Lower look in armUpper 100:< in <:.rm

Lock on hubs.Hook lockTwin lock

H11< ~ -0 C ~ = 0 0-----H12-..:::-0 ()-"'~-C C 0 o-JH13< 0 C--~ c--o 0--0 0H14<:::J- 0 C-------JH15< . -0 0--0 0-----C21< C~ C -0 COO-C24< 0 0 I

Hl1 F3 C21F3

p3 q7

C21F2

q2

H13F2

ql

H14F2

q1

H14Fl

q6

C24F2 C14/15F2" HllF2

q5 q3 p2

Hl1 F1

p4 z2C23Fl

q4

01en

p3 = mirror 3 arm on fast drive sectorq7 = ~ir. 3 locked to sky baf. (~ech. lock)q2 = mire 3 locked to sky baf. (hook lock)ql = nir. 3 locked to a~ (lower fi~ser)

q6 = nir. 3 ~nlocked fro~ arm (upper fi~ge=)

q5 = mir. 3 locked to sky baf. (twin lock)q3 = mirror 3 CO~2r closedp2 = nirror 3 ar~ inp4 = nirror 3 a~ outZ2 = Telescope position (see MeB?I)q4 = mir~or 3 pcwer plug out

iiliCBH 1

Mirror 3 Arm

Interlock panel

N:'~·1BER:

( ~. 4 ") -)r 19 . . _ . ::>

I::!!I'" 0'''1::' ,,·V-=,\11 """._- C'C_. ,_-

1-.. n. 9.i6 ;<...;.40:-.~I •I~l _

Nr.

8.3-1

8.3-2

8.3-3

Nr. ControlManual

3b.7-A

3b.7-B

3b.7-C

INDEX OF FIGURES----------------

Subject Page

Locations of ON/OFF motors 46and servos

Location of MCB and RIOS 47

Example of ON/OFF motors cabling 48

9.2-1

9.2-2

9.2-3

9.2-4

10.1

10.2

10.3-1

4.2.4

Standard Motor Control BOx MCB8

Photograph of MCBU4

Module Front Panel of MCBU4

Principle of interlocks

General principle of ON/OFFmotor command

Remote Control Handset

Portable Hand-Drive Box

49

50

51

52

53

54

55

12.2-1 4.2.2

12.2-24.1.2

Principle of a ON/OFF MotorControl

Layout of the Interlock cabling

56

57

12.4 4.2.5 MCBHl Mirror 3 Arm 58

Documents

CABLING POSITION CONTROL AND INTERLOCKS...- 1 - 1. CABLE TWISTS Polar axis T25-100 Declination axis T25-200 1.1 Principle The cable twists accomodate besides cables, also fle xible