Repair manual

- if the output current on the load is not 90A, adjust it using
R55 on the control board ( )
- disable the ohmic loads and switch off the machine at the main
switch.
- set up the ohmic loads with the switch settings as in the table in
- on the front panel position the current potentiometer on
maximum (turn clockwise as far as it will go) and switch on the
machine in “ ”;
- start up the ohmic load, press the torch button simulator and
verify that:
- the waveforms displayed on the oscilloscope resemble
those in ;
- the output current is equal to +90Adc 5% and the output
voltageis equal to +116Vdc 10%;
- if the output current on the load is not 90A, adjust it using
R55 on the control board ( );
- disable the ohmic loads and switch off the machine at the main
switch.
To prevent the ohmic loads from being subjected to excessive
overheating, do not leave the machine in operation under these
conditions for long periods.
- set up the dual trace oscilloscope by connecting probes CH1
and CH2 x100 to the secondary outputs of the power
transformer. The earth terminals should be connected
together to the shunt towards the secondary dissipator;
remove the multimeter from the OUT+ and OUT- bump
contacts;
- set up the ohmic load with the switch settings as in the table in
;
- on the front panel position the current potentiometer on
maximum (turn clockwise as faras it will go);
- start up the ohmic load, press the torch button simulator and
make sure the waveforms displayed on the oscilloscope
resemblethose in .
- disable the ohmic load and switch off the machine at the main
switch.
- to carry out the endurance test it is absolutely necessary to
procure 4 static load generators (make a series with 2 pairs in
parallel) to prevent the load generators themselves from
breaking down.
- under the load conditions shown in the table in and with
the cutting current potentiometer on maximum, switch on the
machine in “ ” and keep the torch button pressed
until the thermostatic capsules trigger (machine in alarm
status).
switch on the machine in “test mode”, press the air button on
the panel board and make sure that the solenoid valve remains
energised for a period of approx. 45 seconds (duration of
cooling cycle or post-air).
After making sure the wiring and boards are positioned
correctly, disconnect the oscilloscope and ohmic loads.
HF present in torch.
- Switch on the machine normally (not in test mode) and check
the front panel to makesure the followingLED's light up ( ):
green LED D5 (powersupply);
yellow LED D3 (air pressure too low);
red LED D2 (general alarm);
switch off the main switchon the machine.
fig.7
C) Rated load test:
fig.H;
test mode
fig.H
fig.7
N.B.
D) Checking the secondaryboarddiode voltages:
fig.H
fig.I
E) Endurance test
fig. J
test mode
F) Operational checks:
-
-
Warning!
fig.7
-
-
-
-
±
±
18
SUPERIOR PLASMA 90 HF
Switch number
Switch position
Switch position
6
3
2
1
4
5
000
1
1
1
00
0
0
0
0
LOAD 1
LOAD 2
FIGURE G
SETTINGS
PROBE CH1 x100;
200V/Div;
PROBE CH4 = 10A/Divv;
10mV/Div;
10 sec/Div.
VERIFY THAT:
THE FREQUENCY IS
25KHz 5%;
THE AMPLITUDE ON
CH1 IS 560V 10%;
THE AMPLITUDE ON
CH2 IS 26A 10%.
µ
·
·
·
·
·
·
±
·
±
·
±
Switch number
Switch position
Switch position
111
1
1
1
6
3
2
1
4
5
11
1
1
1
0
LOAD 1
LOAD 2
FIGURE H
SETTINGS
PROBE CH1 x100;
200V/Div;
PROBE CH4 = 50A/Divv;
10mV/Div;
10 sec/Div.
VERIFY THAT:
THE FREQUENCY IS
25KHz 5%;
THE AMPLITUDE ON
CH1 IS 560V 10%;
THE AMPLITUDE ON
CH2 IS 100A 10%.
µ
·
·
·
·
·
·
±
·
±
·
±
FIGURE I
SETTINGS
PROBE CH1 x100;
200V/Div;
PROBE CH2 x100;
200V/Div;
10 sec/Div.
VERIFY THAT:
THE REVERSE
VOLTAGE ON CH1
DOES NOT EXCEED
900v;
THE REVERSE
VOLTAGE ON CH2
DOES NOT EXCEED
900V;
µ
·
·
·
·
·
·
·
FIGURE J
222
2
2
2
6
3
2
1
4
5
22
2
2
2
2
LOAD 1
LOAD 2
222
2
2
2
222
2
2
2
LOAD 3
LOAD 4
Switch number
Switch position
Switch position
Switch position
Switch position