Tweco 500P PowerMaster - Manual (Page 47)

POWERMASTER 500, 500P, 350
Manual No. 0-4749 5-5 SERVICE
FAULT CAUSE REMEDY
5 Control Power circuit
breaker trips OFF
A
B
C
D
Short on the 120VAC rear
outlets or 14 / 19 pin
receptacles
Internal short circuit
Defective main circuit
breaker
Defective control / auxiliary
transformer
A
B
C
D
Repair the external short circuit
Have an Accredited Thermal Arc
Service Provider check and
repair wiring to both contactors,
fans, main pcb, rear 120VAC
outlets, 14 / 19 pin receptacles
and small control transformer
Have an Accredited Thermal Arc
Service Provider replace the
circuit breaker
Have an Accredited Thermal Arc
Service Provider replace the
control / auxiliary transformer
6 Power Source powers up
but no output or incorrect
output
A
B
C
D
E
F
Check open circuit voltage
is correct
Shorted Output Diode
Check front panel controls
are correct
Defective main control pcb
Defective IGBT or input
rectifier
Possible faulty wiring to
current sensor, or faulty
current sensor
A
B
C
D
E
F
Open Circuit Voltage should be
between 55 – 70VDC
Have an Accredited Thermal Arc
Service Provider replace diode
Set Remote / Local to Remote
Check range of main control
500/500P 350
GTAW 5–560A 5–425A
SMAW 5–560A 5–425A
CAG 5–560A 5–425A
GMAW 10–44V 10–38V
Check contactor control
When the contactor is ON the
indicator LED should be ON.
When the contactor is ON there
should be open circuit voltage
on the output terminals
Have an Accredited Thermal Arc
Service Provider replace pcb
Have an Accredited Thermal Arc
Service Provider replace the
IGBT or input rectifier
Have an Accredited Thermal Arc
Service Provider check wiring to
the current sensor, or replace
faulty current sensor
Power Source Problems (con't)