41
6.3.4 power not on or low voltage
problem
possible cause
action
Power source inoperable:
Main power lamp is off.
Missing 3-phase input voltage
Restore all 3 phases of input voltage to within
±10% of nominal line.
Missing 1 of 3-phase input voltage
Restore all 3 phases of input voltage to within
±10% of nominal line.
Low open circuit voltage
Fuse F3/F4 blown
Replace F3/F4
Pilot arc Contactor (K4) faulty
Replace K4
Faulty Control PCB1
Replace Control PCB1 (P/N 0558038312)
problem
possible cause
action
Fault light illuminates at the end of
cut but goes off at the start of the
next.
Normal condition caused when ter
-
minating the arc by running the torch
off the work or the arc being attached
to a part that falls away.
Reprogram cutting process to
ensure arc is terminated only by
removing the “Contactor On” signal.
LED 3 – (amber) Bus Ripple
Imbalance of 3-phase input power
Maintain phase voltage imbalance
of less than 5%.
Momentary loss of one phase of
input power
Restore and maintain input power
within ±10% nominal
Faulty control PCB1
Replace PCB1 P/N 0558038312
LED 4 – (amber) High Bus
One or more phases of input voltage
exceed nominal line voltage by more
than 15%.
Restore and maintain line voltage
within ±10%
Faulty control PCB1
Replace PCB1 P/N 0558038312
One or more shorted diode rectifiers
(D25-D28) on the “Electrode Plate”
Replace shorted diode rectifiers
LED 5 – (amber) Low Bus
One or more phases of input volt
-
age are lower than nominal by more
than 15%.
Restore and maintain within
±10% of nominal
Blown F1 and F2 fuses
See F1 and F2 in Blown
Fuses Section
Over temp Light comes on.
See over temp in Fault Light Section
Imbalanced 3-phase input
power
Maintain phase voltage imbalance
of less than 5%
Momentary loss of one phase of
input power
Restore and maintain within
±10% of nominal
Faulty Main Contactor (K1)
Replace K1
FAULTY Control PCB1
Replace PCB1 P/N 0558038312
section 6
troubleshootinG
6.3.5 fault light illumination
Summary of Contents for Plasmarc EPP-450
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