11-40
SET-UP AND SAFE OPERATING PROCEDURES
89210000
Problem
Possible Cause
Possible Remedy
Contactor overheating (air
not circulating properly).
Overheat indicators “ON”
Clogged filter
Clean filter thoroughly
(replace if necessary)
Fan not operating, or not
operating efficiently
Replace fan
Cannot initiate a start
sequence
No open circuit voltage
present
See proceeding problem
Manual remote control “Start/
Stop” pendant or jumper
not connected to “Remote
Control” receptacle on control
panel
Remote control pendant or
jumper connector must be
in receptacle
Break in remote control “Start/
Stop” pendant cable
Repair/replace cable
Defective “Start/Stop” switch
on panel
Replace switch
Contactor unit in high
temperature shutdown
Allow contactor unit to
cool/check fan and filter
Defective MCCB*
Replace MCCB*
Erratic or uncontrollable
arc
Constant current (CC) constant
potential (CP) toggle switch on
MCCB improperly set
Reread Section entitled “
Starting Conditions“
Using improper torch
operating conditions for
electrode size (diameter)
See Chart 1 for proper
operating conditions
Insufficient arc voltage
due to “drooping curve”
characteristics of “CP” power
source
Set open circuit voltage
higher at power source.
(Reread Section entitled “
Starting Conditions“)
Ammeter does not register
Break in interconnect cable
which links contactor to
controller
Repair/replace interconnect
cable
Loose connections on shunt
on contactor unit
Check/repair connection
Connector(s) J4/J5/J6
improperly or not firmly
connected on MCCB
Check connector(s) for
solid, proper fit
Defective ammeter
Replace meter
Trouble Shooting Guide