In Resistive Load Operation, The Output Voltage Is Not Regular - Cebora SOUND MIG 2035/M Pulse Service Manual

CEBORA S.p.A.

3.3.8 - In resistive load operation, the output voltage is not regular.

For the following tests set continuous "Mode" (led L lit) and the working program n° 1, (see
table 2.8.1). Turn the knobs (B) and (I) all the way clockwise (to maximum) and set the other
knobs to their central position.
OPEN-CIRCUIT OPERATING TEST.
Power source output terminal (F)(-) and (E)(+) = approximately +62 Vdc, with start button
pressed, without output load.
♦ Carry out the test in par. 3.3.7.
For the following tests use a resistive load capable of withstanding the maximum power
source current. The appropriate values are shown in the table.
Resistive load
resistance
0.12 ohm
OUTPUT VOLTAGE TEST ON RESISTIVE LOAD.
Power source output terminals (F)(-) and (E)(+) = values as shown in the table, with start
button pressed.
♦ Correct operation.
POWER BOARD (26) POWER SUPPLY TEST.
Power board (26), terminals TP3(+) and TP4(-) = approximately +290 Vdc, with start button
pressed and power source loaded (table conditions).
♦ Check for the presence of mains voltage at terminals TP1 and TP2 of power board
(26).
♦ Check the voltage on power board (26), connector J3, terminals 3(+) and 4(-) =
+13 Vdc (end DC-capacitors pre-charge signal). If absent, check the wiring
between J3 power board (26) and J11 control board (27), and check, with power
source off and J11 on control board (27) disconnected, the resistance between the
terminals 3 and 4 of J3 power board (26). Correct value = approximately 400
ohms. If 0 ohm (short-circuit), replace power board (26) and control board (27).
If >Mohm (circuit broken), replace power board (26).
♦ Replace the power board (26).
3.302.161
NOTE
Correct?
YES
NOTE
Maximum output
current
200 Adc
Correct?
NO
Correct?
YES
NO
Power source
output voltage
+24 Vdc Start button pressed
YES
NO
Condition
24/03/2004
24