1105

MM

A U

NITS

125-130A

Language: English

Date C

reation: Jan. 2005

Rev.: 00

Service Manual

Pag. 3

INVER

TERS M

MA

130A

1105

1.0R

EPAIR

INSTR

UC

TION

S

1.1G

ENER

AL C

LEAN

ING

Rem

ove the machine shell and clean carefully

with com

pressed air.

1.2M

AC

HIN

E: VISUA

L INSPEC

TION

1.C

heck the general conditions of the electroniccircuit ref. 1, particularly:

•the varistor (R

V1) (fig. 1) if it presents burst-ing m

arks

•the state of the levelling condensers C

32and C

33 (fig. 2) check if there are swellings

In ca

2.C

heck on all the harnesses the insulation ofthe cables and the state at the connectionpoints.

1.3C

HEC

K O

F THE M

AIN

CO

MPO

NEN

TS WITH

TES

TER

(OH

MM

ETE

R) O

N TH

E C

IRC

UIT

REF. 1

1.C

heck for the presence of short circuits on therectifier bridge (VD

1) and the correct value ofthe pow

er resistance (R14) (fig. 3).

C33

R14

RV1

C32

or breaks on the container

•check for the presence of cracks or breakson the w

elds of the following com

ponents:

•transform

er T1

•im

pedance L2

•the presence of burn tracks or electric dis-charge m

arks on the printed circuitse of faults, replace the electronic circuit ref. 1

1.IG

BT of the prim

ary circuit and diodes of recy-cle: test points G

-C, G

-E, C-E

of components 1

and 2; points A-K of components 3 and 4 (fig.

4).

2.D

iodes of the secondary circuit: check points1-K of diodes VD

1 and VD2 (fig. 5).

If there are short circuits or faults during thesetests, replace the electronic circuit.

FIG. 1 REF. 1

FIG. 2 REF. 1

FIG.3R

IF. 1

VB1FIG. 4 R

IF. 1

34

12

Pag. 5

INVER

TERS M

MA

130A

1105

1.4C

HEC

K

OF

GEN

ERA

TOR

O

PERA

TION

1.

FIG. 5 REF. 1

VD1

VD2

E AF B

FIG. 8 REF. 1

WITH

OSC

ILLOSC

OPE A

ND

VOLTM

ETERC

onnect a feeder on the zener V13 with G

ND

on the anode and supply with approx. 15V

dc;set the oscilloscope on a tim

e base of 5 uSand a range of 0.5 V

/Div w

ith probe x10 andverify:

•the presence betw

een points: E (GN

D) - A

(probe) and F (GN

D) - B

(probe) (fig. 6) ofthe w

aveform show

n in fig. 7: if the wave-

form differs from

the one in the figure or it isnot present, the electronic circuit is broken. Solution: board replacem

ent ref. 1.

2.D

isconnect the feeder; set the oscilloscopew

ith a range of 1V/Div and connect the probe

X100 between points M

and P (fig. 9); connectthe m

achine to the power supply, sw

itch it on:

•the m

otor fan starts up, and after approx. 2seconds a w

ave will appear as in fig. 9.

FIG. 7 REF. 1

FIG.8 RIF. 1

P

FIG. 9 REF.1

M

Pag. 7

INVER

TERS M

MA

130A

1105

•check w

ith a voltmeter that the output volt-

age is approx. 47Vdc (see test specification

point 2).

•If the w

ave form does not appear or the out-

put voltage is not correct, replace the elec-tronic circuit ref. 1

Carry out the final test after the repair.

2.0FIN

AL TEST

1.C

arry out the safety test according to our oper-ative instruction N

. SLL12, before proceeding,act as follow

s:

•on the electronic board (ref. 1) short-circuitpoints U

, T and a rheophore of the primary

Afteoff.23456789

FIG. 10 RIF. 1

UT

PR

IMA

RY

CIR

CU

ITO

F THE

TRA

SF.

circuit of the transformer (fig. 10)

•sw

itch on

•short-circuit the feeder plug

•short-circuit the output dinse..

r the test remove all the short circuits and sw

itch

.C

onnect the generator to the power supply

(230 Vac), switch it on and check if the voltage

of the outputs is 47 Vdc (+/- 5%): sw

itch off thegenerator.

.C

onnect the generator to the resistive load: theload m

ust be regulated so that the voltage onthe load, w

ith maxim

um current, is betw

een20V

and 23V. Apply oscilloscope probe as in

fig. 8

.Set the regulation knob to the centre of thedial, sw

itch on the generator, turn the knob tothe m

aximum

welding current and read w

iththe am

perometer the m

aximum

current indi-cated on the technical table w

ith +/- 5% toler-

ance. You will see on the oscilloscope a

waveform

as in fig. 11.

.If the current readings differ, use the trim

mer T

(fig. 13) to obtain the correct current value.

.Short-circuit the load and verify that after 1,5sec. the current descends to approx. 25A.

.R

egulate the resistive load to measure the

minim

um current (5A - 20V

), set the minim

umcurrent on the frontal panel and check w

ith theam

perometer that there is a value near than

the one indicated on the technical table.

.D

isconnect the probe, switch off the generator

and with the load to the m

aximum

current, letthe m

achine work at the greatest capacity.

.C

arry out MM

A welding tests at m

aximum

cur-rent (one electrode)

FIG. 11 REF. 1

FIG. 12 REF. 1

T

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SCHEMA ELETTRICO

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DIAGRAM

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A ELÉCTRICO

1105TAV. 2

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