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section 6
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
6.3.1 no output with contactor signal applied
problem
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.
6.3.2 output limited to 100a
problem
Power source will not go over
100A.
6.3.3 fans not working
problem
All 4 fans do not run
1, 2 or 3 fans do not run.
possible cause
External emergency stop (E-stop) is
open.
E-stop button on front panel is pushed
in.
Power reset lamp on front panel indi-
cates a serious fault condition.
possible cause
High current range signal missing.
possible cause
This is normal when not cutting.
Fans run only when "Contactor On"
signal is received.
Broken or disconnected wire in fan
motor circuit.
Faulty fan(s)
Connect isolated contact of E-stop switch to pro-
vide connection between J1-E and J1-F.
Twist and pull out to reset E-stop condition.
Refer to section under fault light illumination.
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.
None
Repair wire.
Replace fans
40
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