Datasheet WTC3 HUB MODULE 2

Datasheet revised: 2015-07-22. Version no. 0.8

HQ KK Wind Solutions A/S

Bøgildvej 3

DK-7430 Ikast

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Datasheet

WTC3 HUB MODULE 2 Hydraulic pitch controller module for wind turbine pitch systems which

uses proportional valves.

Copyright © KK Wind Solutions A/S, Denmark Page 2 of 29

Contents

1 Introduction ........................................................................................................................ 4

1.1 Part numbers .................................................................................................................. 4

2 Important note ................................................................................................................... 4

3 Features .............................................................................................................................. 5

4 Supplies .............................................................................................................................. 6

4.1 Board AC supply input .................................................................................................... 6

4.2 24 VDC valve supply with voltage monitoring ................................................................. 6

4.2.1 Measurement of valve supply ............................................................................ 6

4.3 Transducers supply ......................................................................................................... 7

5 Environmental data ............................................................................................................. 8

5.1 Temperature .................................................................................................................. 8

6 Input ................................................................................................................................... 9

6.1 Analog current input ....................................................................................................... 9

6.2 Digital input .................................................................................................................... 9

6.3 RS485 encoder interface ............................................................................................... 10

6.4 Linear position sensor interface .................................................................................... 10

6.5 RS485 interface (TCM) .................................................................................................. 11

6.6 Valve slider position feedback ...................................................................................... 11

7 On-board sensors .............................................................................................................. 12

7.1 Two axis accelerometer ................................................................................................ 12

8 Output .............................................................................................................................. 13

8.1 Digital output................................................................................................................ 13

8.2 PWM valve output with current measurement ............................................................. 13

9 Fuses................................................................................................................................. 14

10 Ethernet ............................................................................................................................ 15

11 CAN-bus ............................................................................................................................ 16

11.1 CAN setup ..................................................................................................................... 16

11.1.1 CAN address ..................................................................................................... 16

11.1.2 CAN bitrate ...................................................................................................... 16

11.2 Electrical interface ........................................................................................................ 17

11.3 Protocol ........................................................................................................................ 17

11.4 Parameters ................................................................................................................... 17

12 Pitch control ..................................................................................................................... 19

12.1 Linear pitch encoder ..................................................................................................... 19

12.2 4-20mA pitch encoder .................................................................................................. 20

13 LED indicators ................................................................................................................... 21

13.1 32 Vac Power ................................................................................................................ 21

13.2 +24 v Val Supply ........................................................................................................... 21

13.3 Module status ............................................................................................................... 21

13.4 Digital Input .................................................................................................................. 22

13.5 Digital Output ............................................................................................................... 22

13.6 BILL (RS485 encoder interface) ..................................................................................... 22


13.7 MTS (Linear position sensor) ......................................................................................... 22

13.8 TCM (RS485 interface) .................................................................................................. 22

13.9 CAN Rx/Tx ..................................................................................................................... 22

13.10 Ethernet ....................................................................................................................... 23

13.11 Valve Slide .................................................................................................................... 23

13.12 PWM Output A, B & C ................................................................................................... 23

14 Standards .......................................................................................................................... 24

14.1 EMC standards .............................................................................................................. 24

15 Module view ..................................................................................................................... 25

16 Mechanical ....................................................................................................................... 26

16.1 Mounting plate ............................................................................................................. 26

17 Appendix .......................................................................................................................... 27

17.1 Valve supply inrush current .......................................................................................... 27

17.1.1 Supply impedance 0.25 Ω ................................................................................. 27

17.1.2 Supply impedance 1.0 Ω ................................................................................... 28

17.2 Board AC Supply inrush current .................................................................................... 29


1 Introduction

The WTC3 Hub module 2, is the second generation hydraulic pitch control module from KK Wind

Solutions. It is designed to be installed in a wind turbine hub, and control a hydraulic pitch system.

The module can control up to 3 proportional valves, each one typically used for pitching a wind

turbine blade. The Hub module 2 controls the current in the solenoids of the proportional valve

directly, and does not need proportional valves within build in control electronics. The module can

use both proportional valves with slider feedback (differential transformer) and without. The

module is also able to use both linear position sensors, typically build into the hydraulic pistons, or

simple 4-20mA encoders.

1.1 Part numbers

This datasheet covers the following part numbers.

V5514 ........................................... : Standard edition.

2 Important note

ESD (Electro Static Discharge) sensitive devices on Printed Circuit Board. Take the necessary

precautions when working on ESD sensitive parts.


3 Features

• Control of 3 wind turbine blade pitch positions using proportional valves

• Control of 3 proportional valve slider positions for valves with differential transformer

• Control of 6 proportional valve solenoid currents (2 for each valve)

• 2 x digital output (PNP)

• 2 x digital input (PNP)

• 6 x analog current input ( 2 - 22 mA)

• 6 x Pulse-Width Modulated output with current measurement and overload protection

• 3 x Slide position input ( Differential transformer )

• 3 x Linear position sensor interface

• 3 x RS485 encoder interface (Leine Linde - BiLL protocol)

• 3 x RS485 multidrop interface (TCM)

• CAN interface

• Selectable CAN bitrate

• Selectable CAN address

• Two axis accelerometer

• Ethernet interface for high speed data logging

• Module status read out via LEDs and CAN-interface

• Power supply 32VAC ±30%

• Self-diagnostics

• Power supply monitoring


4 Supplies

4.1 Board AC supply input

Main supply for the whole board. Used for internal power and regulated 24VDC supplies for

transduceres. The supply for PWM output for valves are not included.

Input voltage ................................. : 32VAC +/- 30%

Input current ................................. : max. 1.3A @ min. input voltage

Max. inrush current half wave ....... : ~40A peak (source impedance ~0.25 ohm, See appendix)

Input frequency ............................ : 47..63Hz

Fuse .............................................. : 3.15AT 250V

CPU power after power down ....... : min. 100 ms.

GENConnector Pins Function

X12 – ACPOWER

PE Protective earth

0VAC AC 0V reference

32VAC 32VAC supply input

4.2 24 VDC valve supply with voltage monitoring

Input for 24VDC supplying the PWM Valve output circuit on board.

Input voltage ................................. : 24V +/- 20%

Input current ................................. : max. 10A

Input capacity ............................... : max. 11.3 mF

Input inrush current @ RGEN= 1 Ω .. : 24APEAK / 17AAVAGE in 10ms (See Appendix)

Connector Pins Function

X30 - DC_POWER_IN

GND GND input

GND GND input

+24V 24 VDC input

+24V 24 VDC input

4.2.1 Measurement of valve supply

Measure accuracy ......................... : +/- 2 %

Sample frequency ......................... : 833 Hz

Average filter ................................ : 1..65535 Samples

Update interval (process telegram) : 1..65535 ms

Measure range .............................. : 0..27V

Measure resolution ....................... : 12 bit


4.3 Transducers supply

+24V is available for transducers connected to the module. This supply is accessed in each

connector. The supply are generated form the 32VAC supply input.

Output voltage .............................. : +24VDC +/- 10%

Output current

Group: BILL - MTS - TCM ............. : 750 mA max. total

Group: AI - DI - DO ...................... : 750 mA max. total


5 Environmental data

5.1 Temperature

Operating temperature range ....... : -40..70°C

Storage temperature range ........... : -40..85°C


6 Input

6.1 Analog current input

The analog inputs can be used for either general purpose inputs or for pitch angle encoder inputs.

If used for pitch encoders, input 1, 2 and 3 should be used for the three blades.

Number of inputs .......................... : 6

Input range ................................... : 2..22 mA

Resolution ..................................... : 12 bit

Input resistance ............................ : 200 Ω

Accuracy ....................................... : +/- 1% full scale



Update interval (process telegram) : 1..65535 ms


X1 – AIN1

X2 – AIN2

X3 – AIN3

X4 – AIN4

X5 – AIN5

X6 – AIN6

GND GND

S Signal input

+24V Supply for transducer

6.2 Digital input

The 2 digital inputs are used for safety loop inputs. In order for the module to consider the safety

loop closed, DI1 should be off and DI2 should be on. In all other combinations the safety loop is

considered open, and the module will go into emergency stop state.

Number of inputs .......................... : 2

Input type ..................................... : PNP

Input resistance ............................ : Nom. 1600 Ω

Input ON ....................................... : >17,5VDC

Input OFF ...................................... : <5VDC

Hysteresis ..................................... : typ. 4.5 VDC


On/Off - delay ............................... : 0..655.35 Sec ( 0.01 Sec/step)

Update interval (process telegram) : 1..65535ms


X8 – DI1

X9 – DI2

GND GND

INP Signal input



6.3 RS485 encoder interface

Number of inputs .......................... : 3 (multidrop)

Bus interface ................................. : RS485

Baud rate ...................................... : 38.400

Supported encoders ...................... : Leine&Linde with BiLL protocol

Sample interval ............................. : 100ms



X13 - BILL ENC A

X14 - BILL ENC B

X15 - BILL ENC C

SHLD SHLD

GND GND

A0V Address 0 Volt

A1 Address Bit 1

A0 Address Bit 0

B 485 – B

A 485 – A

+24V Supply for encoder

6.4 Linear position sensor interface

Number of inputs .......................... : 3

Interface ....................................... : Start Stop / Digital pulse interface.

Supported encoders ...................... : MTS Temposonics G-series, Balluff BTL-series.

Measure resolution ....................... : 16 Bit ~ 0.15mm @ 2800 m/sec

Measure range .............................. : 9600 mm.

Sample frequency ......................... : 833 Hz.




X16 - MTS-A

X17 - MTS-B

X18 - MTS-C

SHLD SHLD

GND GND

Rx- Puls receive -

Rx+ Puls receive +

Tx- Puls transmit -

Tx+ Puls transmit +


PI_ENC_A PI_ENC_B PI_ENC_C


6.5 RS485 interface (TCM)

This interface is currently not used, but available for customer specific requests.

Number of inputs .......................... : 3 (multidrop)

Bus interface ................................. : RS485

Baud rate ...................................... : 150..1.000.000

Supported protocol ....................... : Optional

Tx, Rx buffer .................................. : 16 byte.


X19 - TCM-A

X20 - TCM-B

X21 - TCM-C

SHLD SHLD

GND GND

B 485 – B

A 485 – A


6.6 Valve slider position feedback

Number of inputs .......................... : 3

Interface ....................................... : Differential transformer.

Measure source voltage ................ : 10 VAC - 5000 Hz. +/-20%

Measure resolution ....................... : 12 Bit

Sample frequency ......................... : 5.000 Hz.

Average filter ................................ : 1..65535 * 6 Samples

Update interval (process telegram) : 1..65535ms Connector Pins Function

X24 – SLIDE A

X25 – SLIDE B

X26 – SLIDE C

SHLD SHLD

Si- Slide feedback +

Si+ Slide feedback -

So- Slide output + (12 Vac 5khz )

So+ Slide output - (12 Vac 5khz )

PI_ENC_A PI_ENC_B PI_ENC_C


7 On-board sensors

7.1 Two axis accelerometer

Input range ................................... : +/- 1.2 g.

Resolution ..................................... : 15 bit

Sample frequency ......................... : 833 Hz.




8 Output

8.1 Digital output

Digital output 1 (X10) should be used for controlling safety valves. It will be set to on

automatically, when the module is not in emergency stop state.

Number of outputs ....................... : 2

Output type .................................. : PNP

Output load................................... : Max. 100 mA

Output .......................................... : 0 / 24 VDC

Open load detection


X10 – DO1

X11 – DO2

GND GND

OUT Output +24V Valve supply

8.2 PWM valve output with current measurement

The valve PWM outputs are supplied from X30 "24 VDC valve supply". The supply connected must

have the power capacity needed for the selected valves.

Number of outputs ....................... : 6

Type .............................................. : PNP

Modulation frequency .................. : 5 kHz

Min inductive load ........................ : 3.5 mH

Max resistive load ......................... : 4.5 Ω

Max continuously mean current.... : 2.8 A

Over current protection ................ : 5 Apeak

Current measure range ................. : 0..5 A

Current measure accuracy ............ : +/- 5 %

Resolution ..................................... : 12 bit

Error check .................................... : Over current and to high load resistance


X27 – PWM_A

X28 – PWM_B

X29 – PWM_C

SHLD Shield

a+ Valve a supply +

a- Valve a supply -

SHLD Shield

b+ Valve b supply +

b- Valve b supply -


9 Fuses

Fuse Source Connector Description

F1: T3.15AL250V AC supply X12 AC POWER input

F2: T3.15AL250V AC supply X12 AC POWER input


10 Ethernet

The Ethernet port can be used for high speed data logging. All measurement and output signals

are available.

Number of ports ........................... : 1

Communication speed .................. : 10/100 Mbit/s

Protocol ........................................ : UDP/IP

Connector Function

X7 - Ethernet 10/100 Mbit communication.


11 CAN-bus

Input / output control and measurement data are transferred via the CAN bus interface.

Detailed CAN bus information: bus configurations, cable specification, and line termination are

available in: “Datasheet WTC3 CAN bus”.

11.1 CAN setup

Before the module is powered on, the CAN bus address and bitrate must be set.

Setup is done by the two rotate switches located in the ‘CAN SETUP’ area.

11.1.1 CAN address

The CAN address is set up by the rotate switch ‘ADDRESS’.

ADDRESS Module address

0 Module disabled

1 1

2 2

3 3

4 4

5 5

6 6

7 7

8 8

9 9

11.1.2 CAN bitrate

The CAN bitrate is set up by the rotate switch ‘BITRATE’.

BITRATE CAN bitrate

0 125kBit

1 250kBit

2 500kBit

3 1MBit


11.2 Electrical interface

Bus specification ........................... : FULL CAN 2.0B

Bus impedance .............................. : 120Ω

Termination .................................. : 120Ω (Must be applied externally at end points)


X23 – CAN IN

HI CAN bus signal HI

LO CAN bus signal LO

0V CAN bus reference - connected to GND

SHLD CAN bus shield - connected to GND

X22 – CAN OUT

HI CAN bus signal HI

LO CAN bus signal LO

0V CAN bus reference - connected to GND

SHLD CAN bus shield - connected to GND

11.3 Protocol

The protocol used for transferring data over the CAN bus is a process data based protocol with

adjustable update times. For integrating the module into a standard PLC system a library is

available.

11.4 Parameters

Several parameters can be set up via CAN, the following table lists the parameters:

Parameter Default Function

Linear position sensor gradient 2846.4 m/s Pulse speed for the used sensors. Typically written on the sensor.

Linear position sensor max start

pulse

65535 tics It is considered an error if the start pulse is received after this amount of tics.

Linear position sensor min start

pulse

0 tics It is considered an error if the start pulse is received before this amount of tics.

Linear position sensor max stop

pulse

65535 tics It is considered an error if the stop pulse is received after this amount of tics.

Linear position sensor min stop

pulse

0 tics It is considered an error if the stop pulse is received before this amount of tics.

Linear position sensor error step size

3 counts Every time a measurement error occurs an error counter is incremented by this amount. If

the counter exceeds the value given by parameter “Linear position sensor error fail level”

a sensor error is signalled. Error counting is done individually for each input channel.

Linear position sensor error fail level 128 counts Threshold for signalling an error, see above parameter.

Current control Kp 300 %duty/A PID controller parameter.

Current control Ti 10 ms PID controller parameter.

Current control dither amplitude

50 mA This specifies the amplitude of a signal which is added to the current set point. The sign of

the added signal is inverted every time period given by parameter “Current control dither

period”. The purpose of this added signal is to make sure that the solenoid coils are

moved a little, so they will not get stuck.

Current control dither period 10 ms Period for toggling the current dither signal, see above parameter.

Current control cross compensation 100 % Determines amount of compensation between the two sides of each proportional valve.

Slider control Kp 10 mA/% PID controller parameter.

Slider control Ti 65 ms PID controller parameter.

Slider control dead band gain 20 mA/% Additional gain in the valve dead band.


Slider control dead band 100 mA Size of dead band.

Slider control max opening 90 % Limit for slider position (opening) 100% is fully opened.

Piston position control Kp 4 %/mm PID controller parameter.

Piston position control Ti 300 ms PID controller parameter.

Piston position controller integration

reset limit

2 mm Integrator of PID controller is reset if error signal exceeds this value.

Piston position controller dead band

gain

20 %/mm Additional gain in the valve dead band.

Piston position controller dead band 10 % Size of dead band.

Max pitch speed 10 deg/s Maximum pitch speed when controlled by proportional valve.

Pitch calibration angle 0 deg Angle in which pitch position is calibrated.

Current control max error 200 mA It is considered an error if the current controller set point and actual value differs by more

than this value.

Slider control max error 10 % It is considered an error if the slider controller set point and actual value differs by more

than this value.

Piston position control max error 20 mm It is considered an error if the piston position controller set point and actual value differs

by more than this value.

Pitch angle control max error 3 deg It is considered an error if the pitch angle controller set point and actual value differs by

more than this value.

Pitch angle control Kp 2.7 A/deg PID controller parameter.

Pitch angle control Ti 1.0 sec PID controller parameter.

Pitch angle controller integration

reset limit

0.2 deg Integrator of PID controller is reset if error signal exceeds this value.

Pitch angle controller dead band

gain

0 A/deg Additional dead band gain

Pitch angle controller dead band 300 mA Size of dead band.

Turbine type

0 Select turbine type:

0: Encoder with linear position sensor interface X16/X17/X18, and proportional valve with

slider feedback X24/X25/X26.

1: Encoder with 4-20mA sensor interface X1/X2/X3, and proportional valve without slider

feedback. X24/X25/X26 are not used.


12 Pitch control

The main purpose of this module is to perform control of the pitch position of up to 3 blades in a

wind turbine. The module is controlled via CAN as specified in section 11. Using the CAN

communication, the module can be set to two different operation modes, one for turbines which

uses pitch encoders with linear position sensor interface X16/X17/X18, and proportional valves

with slider feedback X24/X25/X26. The other mode is for turbines which use 4-20mA pitch

encoders X1/X2/X3, and proportional valves without slider feedback. The operation of these two

modes will be described below.

12.1 Linear pitch encoder

When the linear pitch encoder mode is selected, the pitch control is done as can be seen below.

In general the pitch control scheme is based on three nested PID controllers.

The pitch references is received via CAN and ramped according to the parameter “Max pitch

speed”. Afterwards the new ramped references are converted into piston lengths which are

compared to the measured values and three PID controllers calculate the required slider position

(valve opening) for each blade. This required slider positions are compared to the measured slider

positions and another set of PID controllers calculate the required current to reach the slider

positions. These required currents are compared to the measured currents and yet another set of

PID controllers calculate the required PWM duty cycles from this. The parameters for the PID

controllers can be set via CAN as described in section 11.4.


12.2 4-20mA pitch encoder

When the 4-20mA pitch encoder mode is selected, the pitch control is done as can be seen below.

In general the pitch control scheme is based on two nested PID controllers.

The pitch references is received via CAN and ramped according to the parameter “Max pitch

speed”. Afterwards the new ramped references are compared to the measured values and three

PID controllers calculate the required current for each blade. These required currents are

compared to the measured currents and another set of PID controllers calculates the required

PWM duty cycles from this. The parameters for the PID controllers can be set via CAN as described

in section 11.4.


13 LED indicators

Information about the module status is indicated by several LEDs placed in groups on the module.

Green LEDs.................. Module related status indicators

Yellow LEDs ................. Input status indicators

Red LEDs ..................... Error indicators

13.1 32 Vac Power

LED Colour Status Means

AC POWER Green ON 32VAC input OK

OFF 32VAC input missing or below 22VAC

13.2 +24 v Val Supply


VAL SUPP. Green ON Valve supply +24V supply present

OFF Valve supply +24V supply missing

13.3 Module status


+1V9 Green ON Internal +1V9 supply present

OFF Internal +1V9 supply missing

+3V3 Green ON Internal +3V3 supply present

OFF Internal +3V3 supply missing

+5V Green ON Internal +5V supply present

OFF Internal +5V supply missing

+15V Green ON Internal +15V supply present

OFF Internal +15V supply missing

-15V Green ON Internal -15V supply present

OFF Internal -15V supply missing

+24V SUPP Green ON Internal +24V supply (DI,AI,DO) present

OFF Internal +24V supply (DI,AI,DO) missing

+24V COM Green ON Internal +24V (BiLL, MTS, TCM) supply present

OFF Internal +24V (BiLL, MTS, TCM) supply missing

CPU LIVE Yellow STEADY CPU not running

FLASHING CPU running

WD Red ON External watchdog is resetting CPU

OFF Normal operation.

MOD. ERR. Red ON A fatal module error was detected. Replace module.


BUS OFF Red ON

An error condition on the CAN bus caused the module to disconnect from the

CAN bus.

All outputs are disabled.

The module must be reset to exit this mode.


GUARD Green Red

OFF Module has not yet been enabled via the CAN-bus.

This is not an error condition.

GREEN

FLASHING

Toggle state every time a guard telegram is received via CAN bus, and guard

function is enabled. The signal will start toggle 10 sec. after receiving the first

SystemEnable telegram via CAN bus.


RED

FLASHING

Toggle state every time a guard telegram is received via CAN bus, and guard

function is disabled. This mode is intended for debugging purposes.



RED ON

A guard timeout occurred. Module is offline CAN, and outputs are disabled by

module.

This is an error condition.

GREEN ON The module might have entered the temperature reset mode.


RESET Red ON Module is in a reset condition, and is not operative.


STAT1 Red - For future use

STAT2 Red - For future use

13.4 Digital Input


DI1

DI2 Yellow

ON Input is active

OFF Input is not active

13.5 Digital Output


DO1

DO2 Yellow

ON Output is active

OFF Output is not active

13.6 BILL (RS485 encoder interface)


A_ERR

B_ERR

C_ERR

Red ON Error

OFF Encoder not used.

Tx Green ON Indicating Tx activity on RS485 bus

Rx Yellow ON Indicating Rx activity on RS485 bus

13.7 MTS (Linear position sensor)


A_ERR

B_ERR

C_ERR

Red ON

Sensor measurement error, check wiring between module connector X16/X17/X18

and sensor

OFF Sensor measurement ok.

13.8 TCM (RS485 interface)


A_ERR

B_ERR

C_ERR

Red ON Not used

OFF Not used

Tx Green ON Indicating Tx activity on RS485 bus

Rx Yellow ON Indicating Rx activity on RS485 bus

13.9 CAN Rx/Tx


CAN Tx Green ON Indicating Tx activity on CAN bus

CAN Rx Yellow ON Indicating Rx activity on CAN bus


13.10 Ethernet


LINK Green ON Connected

OFF Not connected

SPEED Yellow ON 100 Mbit/s

OFF 10 Mbit/s

ACT Yellow ON No activity

OFF Data transfer active (Rx or Tx)

13.11 Valve Slide


A_ERR

B_ERR

C_ERR

Red ON

Module cannot control slider position, check wiring between module connector

X24/ X25/X26 and valve slider feedback.

OFF Slider position control and measurement ok.

13.12 PWM Output A, B & C


ERR Red ON

Module cannot control the current in the solenoids, check wiring between module

connector X27/ X28/X29 and valve solenoids.

OFF Current control and measurement ok.

A

B Yellow

The light intensity depend on the PWM duty cycle


14 Standards

14.1 EMC standards

DS/EN 50081-2:1994 ............ :Electromagnetic compatibility - Generic emission standard - Part 2:

Industrial environment

DS/EN 61000-6-2:1999 ........ :Electromagnetic compatibility (EMC) - Part 6-2: Generic standards –

Immunity for industrial environment


15 Module view

Supply fuse 3,15A

32 Vac supply

Digital Out 2

Bill encoder

C - B – A Digital Out 1

Digital in 2

MTS sensor

C – B – A Digital in 1

TCM / RS485

C – B – A Ethernet

CAN Analog in 6

IN / Out 4..20 mA

Analog in 5

Slide Pos 4..20 mA

C – B – A Analog in 4

4..20 mA

PWM – A Analog in 3

4..20 mA

Analog in 2

PWM – B 4..20 mA

Analog in 1

4..20 mA

PWM – C

Valve supply Module status.

24 Vdc


16 Mechanical

16.1 Mounting plate

50

,00

274,00

57

,00

14,00260,00

38

9,0

03

96

,00

Ø10.00

Ø5,50

40

5,0

0

PC

B

22,00252,00


17 Appendix

17.1 Valve supply inrush current

The Valve supply input on X30 have a high capacitance on the input. That gives a high inrush

current when applying a power supply to it.

This shows the curves for two scenarios. Supply impedance on 0.25Ω and one with 1Ω.

17.1.1 Supply impedance 0.25 Ω

Time

0s 2ms 4ms 6ms 8ms 10ms 12ms 14ms 16ms 18ms 20ms1 V(Rgen:2) 2 -I(Cload)

0V

4V

8V

12V

16V

20V

24V1

0A

20A

40A

60A

80A

100A2

>>

Green = Voltage on input (Y axis 1)

Read = Current (Y axis 2)


17.1.2 Supply impedance 1.0 Ω

Time

0s 2ms 4ms 6ms 8ms 10ms 12ms 14ms 16ms 18ms 20msV(Rgen:2) -I(Cload)

0

4

8

12

16

20

24

Green= Voltage on input

Read= Current


17.2 Board AC Supply inrush current

The board has some capacity in the supply circuit and when power is applied it will result in Inrush

currents of higher levels.

A simulating of the circuit results in the following graph:

Time

0s 2ms 4ms 6ms 8ms 10ms 12ms 14ms 16ms 18ms 20ms 22ms 24ms 26msV(C2:+) I(RGEN1) V(V1:+,V1:-)

-60

-40

-20

-0

20

40

60

Voltage = 32VAC

Generator impedance = 0.25 ohm

Green = AC Voltage on input

Blue = AC Current on input

Red = Voltage inside circuit after diode bridge.

Note: An inductor on the input limits the current raise and that results in a relative little inrush

current.

Liability note

This document has been prepared with care. The product described is, however, constantly under development. For this reason the

document may not in every case have been checked for consistency with regards to performance data, standards or other

characteristics to the products delivered. In the event that this document contains technical or editorial information not reflected in

the products delivered, we reserve the right to make alterations to this document at any time and without prior warning. The data,

diagrams, descriptions and other information in this document shall not in any way form the basis of a direct or indirect claim against

us if the products have been delivered and the modifications in the products are not reflected in this document.

Documents

Datasheet WTC3 HUB MODULE 2