40
section 6
troubleshootinG
6.3 fault isolation
Many of the most common problems are listed by symptom.
6.3.1
No output with contactor signal applied
6.3.2
Output limited to 100A
6.3.3
Fans not working
6.3.4
Power not on or low voltage
6.3.5
Fault light illumination
6.3.6
Torch won’t fire
6.3.7
Fusses blown - F1 and F2
6.3.8
Intermittent, interrupted or partial operation
6.3.3 fans not working
problem
possible cause
action
All 4 fans do not run
This is normal when not cutting.
Fans run only when “Contactor On”
signal is received.
None
1, 2 or 3 fans do not run.
Broken or disconnected wire in fan
motor circuit.
Repair wire.
Faulty fan(s)
Replace fans
6.3.1 no output with contactor signal applied
problem
possible cause
action
Contactor signal is applied,
contactor lamp on front
panel is illuminated, K2 and
K3 contactors do not close
and low bus fault light, LED
5 illuminates.
External emergency stop (E-stop) is
open.
Connect isolated contact of E-stop switch to pro
-
vide connection between J1-E and J1-F.
E-stop button on front panel is pushed
in.
Twist and pull out to reset E-stop condition.
Power reset lamp on front panel indi
-
cates a serious fault condition.
Refer to section under fault light illumination.
6.3.2 output limited to 100a
problem
possible cause
action
Power source will not go over
100A.
High current range signal missing.
External control should connect J1-R to J1-T. As
an alternative, in the power source, move the red
wire on TB8-1 to TB8-2.
Summary of Contents for Plasmarc EPP-450
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