C) Rated load test:
fig. F
fig. F
fig. 7
D) Checking the secondary diode voltages:
fig. F
fig. G
E) Running time test and closing the machine
fig. F
F) Welding test
A) Rated load test
fig. H
Fig. H
fig. 5
-
set up the ohmic load with the switch settings as in the
table in
;
-
on the front panel turn the current potentiometer to
maximum (turn clockwise as far as it will go);
-
start up the ohmic load and make sure that:
-
the waveforms displayed on the oscilloscope resemble
those in
;
-
the output current is equal to +120Adc
5% and the
output voltage is equal to +24.8Vdc 5%; if the output
current reading is not 120A ±5%, adjust the current
using jumpers JP1, JP2 and JP 3 (
).
-
switch off the ohmic load.
-
set up the dual trace oscilloscope, connecting probe CH1
(x100) to the anode of diode D33 and probe CH2 x100 to
the anode of diode D34. The earth terminals should be
connected together to 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 turn the current potentiometer to
maximum (turn clockwise as far as it will go);
-
start up the ohmic load and make sure the waveforms
displayed on the oscilloscope resemble those in
.
-
switch off the ohmic load and switch off the main switch.
Under the load conditions shown in
and with the current
adjustment potentiometer R23 on maximum, switch on the
power source and leave it in operation until the thermostatic
capsules trigger (machine in alarm). After making sure the
internal wiring is positioned correctly assemble the machine
once and for all.
With the power source set up according to the instructions in
the handbook make a test weld at 80A (electrode diameter 2.5
mm). Check the dynamic behaviour of the power source.
In this case the tests are the exactly the same as those for the
Tecnica 144 and can be carried out in the same way, with the
exception of the rated load test (point 1.2 C).
-
set up the ohmic load with the switch settings as in the table
in
;
-
on the front panel turn the current potentiometer to
maximum (turn clockwise as far as it will go);
-
start up the ohmic load and make sure that:
-
the waveforms displayed on the oscilloscope resemble
those in
;
-
the output current is equal to +150Adc ±5% and the
output voltage is equal to +26Vdc ±5%; if the output
current reading is not 150A ±5%, adjust the current
using jumpers JP1, JP2 and JP 3 (
).
-
switch off the ohmic load.
Scheduled tests for the TECNICA 164
±
±
- 14 -
TECNICA 144 - 164
SETTINGS:
· PROBE CH1 x100
· 100V/Div;
· PROBE CH2 x10;
· AMPLITUDE CH1
IS
· AMPLITUDE CH2
IS
- 5V/Div;
- 5 sec/Div.
320V ±10%;
8V ±10%.
VERIFY THAT
µ
FIGURE F
1
3
2 3
2
4
2
5
2
6
2
3
FIGURE G
SETTINGS:
· PROBE CH1 x100
· 50V/Div;
· PROBE
·
·
CH2 x100;
50V/Div;
5 sec/Div.
-
ON CH1
AND CH2 DOES NOT
EVCEED 250V.
VERIFY THAT:
µ
REVERSE
AMPLITUDE
position switch
position switch
number switch
number switch
SETTINGS:
· PROBE CH1 x100
· 100V/Div;
· PROBE CH2 x10;
- 5V/Div;
- 5 sec/Div.
· AMPLITUDE CH1
IS 320V ±10%;
· AMPLITUDE CH2
IS 8V ±10%.
VERIFY THAT
µ
FIGURE H
1
3
2 3
3
4
3
5
2
6
1
3
