front panel on 12A, connect the machine to the 3-phase power
figure I.
supply 400 Vac and switch it on.
- With the load switched on, check that the voltage and current wave
forms displayed on the oscilloscope resemble those in
figure G
.
Voltage at ends of load: 28,8V ±5%
Current in load: 220A ±5%
Voltage at ends of load: 20,5V ±5%
Current in load 12A ±5%
NOTE.
In order not to subject the static load generator to excess
overheating, do not leave the machine operating under these
C) Average load test:
conditions for a long.
- Set up the static load generator with the switch settings as in the
table in
figure H
, on the front panel position the welding current
E) Checking the secondary board diode voltages:
potentiometer on 130A and switch on the machine.
- Connect 2 voltage probes x100 between the 2 outlets of the power
- Check that the voltage and current wave forms displayed on the
transformer on the secondary board (prods) and the shunt towards
oscilloscope resemble those in
figure H
.
the dissipator (earth).
- Connect the 2 probes to the oscilloscope and under the load
conditions given in the table in
figure I
, switch on the machine and
position the current potentiometer on maximum.
- Check that the voltage wave forms displayed on the oscilloscope
resemble those in
figure J
.
Voltage at ends of load: 25,2V ±5%
Current in load 130A ±5%
D) Rated load test:
- Set up the static load generator with the switch settings as in the
table in figure I, on the front panel position the welding current
F) Operational checks:
potentiometer on 220A and switch on the machine.
- Hot Start check.
N.B.
if the output current on the load is not 220A, adjust the current
Set the static load generator so as to obtain a current of 100A±5%
using trimmer R62 on the control board
(figure 7)
with a voltage of 24V±5% (Setting:
3-2-2-2-2-2
) and keeping it
- Check that the voltage and current wave forms resemble those in
switched off for the time being, set the Hot Start adjustment
Figure I
Figure H
Figure G
Figure J
Amplitude tollerance:
÷10%
Current scale:
1V=10A
Amplitude tollerance:
÷10%
Inverse voltage peak should not exceed 250V
Switch number
Position number
Switch number
Position number
Switch number
Position number
Amplitude tollerance:
÷10%
Current scale:
200mV=2A
Amplitude tollerance:
÷10%
Current scale:
1V=10A
SUPERIOR 240 CE
16
