B) Rated load test:
fig. E;
fig. E
C) Checking the secondary diode voltages:
fig. E
fig. F
D) Running time check and closing the machine
fig. E
E) Cutting test
WARNING!
point B)
point A)
fig. E
fig. G
points C)
D)
fig. E
fig. G
A) Rated load test:
fig. G;
fig. G
B) Running time check and closing the machine
fig. G
-
set up the static load generator with the switch settings as
in the table in
-
on the front panel position the cutting current
potentiometer R42 to the maximum (turn the knob
clockwise as far as it will go)and switch on the main switch;
- activate the static load generator, press the torch button
and make sure that:
-
the voltage waveforms on the oscilloscope display
resemble those in
;
-
the output current is +25Adc ±5%, and the output
voltage is +90Vdc ±5%.
-
deactivate the static load generator and switch off the
main switch.
-
set up the dual trace oscilloscope, connecting probe CH1
x 100 to the anode of diode D37 and probe CH2x100 to the
anode of diode D38. Earth connections are both made to
the secondary dissipator;
-
set up the static load generator with the switch settings as
in the table in
;
-
on the front panel position the cutting current
potentiometer R42 to the maximum (turn the knob
clockwise as far as it will go) and switch on the main
switch;
-
activate the resisitive load, press the torch button and
make sure that the waveforms displayed on the
oscilloscope resemble those in
;
-
deactivate the static load generator and switch off the
main switch.
With the load status as in
and the cutting current
adjustment potentiometer (R42) on maximum, switch on the
power source and leave it in operation until the thermostatic
capsules trigger (machine in alarm status). Check the correct
positioning of the internal wiring and finally re-assemble the
machine.
With the power source set up as instructed in the operator's
instruction manual (connect the compressed air supply,
pressure 4.5 bar) make a test cut. Check the dynamic
behaviour of the power source.
Power the power source with a rated voltage of
115Vac. In this case the tests are exactly the same as for the
Tecnica Plasma 31 and can be carried out in the same way
with the exception of the following points in section 1.2:
-
replace
with
in section 1.3);
-
replace
with
in section 1.3);
-
in
and
replace the load in
with the load
given in
in section 1.3.
-
set up the static load generator with the switch settings as
in the table in
-
on the front panel position the cutting current
potentiometer R42 to the maximum (turn the knob
clockwise as far as it will go) and switch on the main
switch;
-
activate the static load generator, press the torch button
and make sure that:
-
the voltage waveforms on the oscilloscope display
resemble those in
;
-
the output current is +16Adc ±5%, and the output
voltage is +86.4Vdc ±5%.
-
deactivate the static load generator and switch off the
main switch.
With the load status as in
and the cutting current
adjustment potentiometer (R42) on maximum, switch on the
power source and leave it in operation until the thermostatic
capsules trigger (machine in alarm status). Check the correct
positioning of the internal wiring and finally re-assemble the
machine.
1.3 Tests for the TECNICA PLASMA 18
- 15 -
TECNICA PLASMA 18 - 31
FIGURE D
1
1
2
0
3
0
4
0
5
0
6
0
Switch number
Position of switch
SETTINGS:
PROBE
PROBE
TIME TOLLERANCES
±20%.
· AMPLITUDE
· AMPLITUDE CH2
·
CH1 x10
· 5V/Div;
·
CH2 x100;
· 100V/Div;
· 5 sec/Div.
CH1
IS 15V ±10%.
IS 380V ±10%.
µ
VERIFY THAT
FIGURE E
1
0
2
1
3
1
4
1
5
1
6
0
Switch number
Position of switch
FIGURE G
1
0
2
0
3
0
4
1
5
1
6
1
Switch number
Position of switch
SETTINGS:
· PROBE CH1 x100
· 100V/Div;
· PROBE CH2 x10;
· 5V/Div;
· 5 sec/Div.
TIME TOLLERANCES:
±20%.
· AMPLITUDE ON
· AMPLITUDE ON CH2 IS
12V ±10%.
µ
VERIFY THAT:
CH1 IS
380V ±10%;
FIGURE F
SETTINGS:
· PROBE CH1 x100;
· 200V/Div
· PROBE CH2 x100;
· 200V/Div;
· 5 sec/Div.
TIME TOLLERANCES:
±20%.
REVERSE AMPLITUDE ON
CH1 E CH2
1000V.
µ
VERIFY THAT:
DOES NOT
EXCEED
