ESAB EPP-400 Manuel D'instructions page 292

section 6
problem
LED 6 – (red) Right Over Cur-
rent
note:
If operation at 250A or less is
possible, then the LEFT side is
not working.
LED 9 – (red) Left Over Current
note:
If operation at 250A or less is
possible, then the Right side is
not working.
possible cause
Output current of the right side exceeds
200A because of operating the power source
over 400A.
Cutting at over 250A with a faulty left side
(left side output = 0)
Right current transducer connector loose
or unplugged. PCB loose.
Loose or unplugged connector at right
PWM/Drive Printed circuit board.
P2 at left of PWM / Drive PCB loose or un-
plugged.
Check voltage between P7-6 and P7-7. A
voltage in either polarity of greater than
0.01 V indicates a faulty right current trans-
ducer (TD2).
Faulty PCB1
Faulty right PWM / Drive PCB
Output current of the left side exceeds 250A
because of operating the power source
over 400.
Cutting at over 250A with a faulty right side
(right side output = 0)
Left current transducer connector loose or
unplugged. PCB loose.
Loose or unplugged connector at left PWM
/ Drive Printed circuit board.
P2 at right of PWM / Drive PCB loose or
unplugged.
Check voltage between P7-2 and P7-3. A
voltage in either polarity of greater than
0.01 V indicates a faulty left current trans-
ducer (TD1).
Faulty PCB1
Faulty left PWM / Drive PCB
292
troubleshootinG
action
Turn the output current down to
400A
See faulty left or right side
Secure connections
Secure connection
Secure connection
Replace right current transducer
(TD2)
Replace PCB1 P/N 0558038287
Replace right PWM / Drive PCB P/N
38030
Turn the output current down to
400A
See faulty right side
Secure connections
Secure connection
Secure connection
Replace left current transducer (TD1)
Replace PCB1 P/N 0558038287
Replace left PWM / Drive PCB P/N
38030