Mosa DSP 400 YSX, Use And Maintenance Manual

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TROUBLE SHOOTING DSP - EP5/EP7/ES
M
40.1
12/05/05 M40DSP/EP5-ES_GB
PROBLEM POSSIBLE CAUSE WHAT TO DO
P1 All functions performed
by the WDC are regular,
but there is no tension
on the welding sockets
1) Position of regulation poten-
tiometer incorrect knob
1) Adjust the position of the WDC regulation knob on the
potentiometer spindle so that the potentiometer is not
completely at the end of its travel when the knob reaches its
minimum position. Idem for the RC1 remote control knob.
1) Replace the WDC. 1) WDC defective P2 Malfunction in the
selection of welding
processes or in their
confirmation on other
functions performed
by the WDC
P3 Blinking “ON” LED 1) Current sensor connector
P3
2) Aux power voltage value
(±15V) too high or too low
1) Connector P3 not inserted or defective - see drawing 5
2) Check the aux trasformer, see drawing 1
P4 Blinking red LED 1) The chopper thermic
protection is intervening
2) Temperature sensor situated
on chopper (NTC resistor)
short circuited or open.
3) WDC defective
1) The output is inhibited automatically; let the motor continue
to run to cool down the chopper, and after a few minutes the
LED will automatically switch off and there will be current/
voltage once again at the welding sockets.
2) Check chopper connector, drawing 2, from pin 1-2. The
resistor must be bigger than 1800
Ω
and less than 25 K
Ω,
otherwise the led blinking.
Replace the chopper.
In the meantime you can work cutting the wire which arrives
to pin 1 - pin 2 and put on it one resistor 10
K
Ω.
In this case the thermic protection don’t work but you can
use the machine.
3) Replace the WDC.
P5 Red LED always on
1) WDC defective
2) Chopper defective
3) Current sensor defective
1) Switch off the machine and start it up again; if the LED remains
off try to weld, verifying that the welding is regular; if the LED
lights up again. Replace the WDC.
2) Check the chopper as shown on drawing 2.
3) Replace the sensor.
1) Check the remote control as drawing 4
2) Replace the WDC
P6 PHG1 remote does not
operate.
1) Remote control (or cable)
defective.
2) WDC defective.
P7 The welding current
is always at max or
always at minimum
1) Potentiometer on WDC
defective
2) WDC defective
3) Welding current sensor
defective
1) Check from pin 1-12 connector P4 (pin 1 - ground see
drawing 3)
2) Replace the WDC
3) Replace the current sensor
P8 No voltage at the
welding sockets in
CV mode
1) Defective wire feeder cable
2) Defective wire feeder
3) Defective WDC
1) Check the connections pin to pin of the wire
2) Check the wire feeder
3) Without wire feeder cable put the pin I in short circuit with G
on remote control connector, the led ON must be light - WDC
ok otherwise change WDC
P9 No welding or
generation output
1) Short circuit of chopper.
2) Short circuit of generation
unit.
3) Alternator defective.
1) Disconnect the chopper and re-start the machine; if there is
now an output present, replace the chopper
2) Disconnect the auxiliary output circuit and re-start the machine;
if there is now an output present, there is a short circuit in the
auxiliary output circuit or in one of the components
3) Disconnect all outputs on the alternator (welding and
© MOSA REV.0-05/05
WELDING