TROUBLE, SYMPTOM AND CONDITION
PROBABLE CAUSE
TEST, CHECK, AND/OR REMEDY
MACHINE WILL NOT OPERATE (CONTINUED)
4. Contactor operates and blows line fuses. (Continued)
Step 2. Line fuses too small.
Install fuses of proper amperage rating. Refer to Section
1-2, Fig. 1 for proper fuse size.
Step 3. Links on voltage changeover board incorrectly connected.
Check appropriate voltage changeover diagram in
Chapter 8 for proper link positions. Make correction as
necessary.
Step 4. SCR failure or shorted flyback diode.
Refer to detailed troubleshooting instructions.
Step 5. Short circuit in primary connections.
Remove short circuit.
UNIT TRIPS OUT AFTER STARTING.
1. Unit delivers power but soon shuts down.
(Thermal overload, electronic overload or overvoltage circuit trips).
Step 1. Power supply overloaded.
Reduce load, overload can be carried only for a short
time.
Step 2. Duty cycle too high.
Do not operate continually at overload currents.
Electrical Troubleshooting Chart
Figure 1 (Sheet 3 of 7 Sheets)
OM-2010
3-4 April 10/89 Revised
Page 6
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