Troubleshooting - Miller Electric CP-302 Owner's Manual

4-3. Troubleshooting

Trouble
Completely inoperative; fan does not run.
No weld output; fan motor FM running.
Excessive line current; line fuse(s) and/or circuit
breaker(s) open repeatedly.
Weld output available; fan does not run.
Fan runs slowly.
Limited output and low open-circuit voltage.
Erratic or improper weld output.
No 115 volts ac output at Remote 14 receptacle RC8. Reset circuit breaker CB1, if necessary (see Section 2-12).
No 24 volts ac output at Remote 14 receptacle RC8.
Limited output.
OM-259 Page 22
Place line disconnect switch in the On position (see Section 2-15).
Check and replace open line fuse(s) (see Section 2-15).
Check for proper jumper link positions (see Section 2-14).
Check for proper input connections (see Section 2-15).
Reset circuit breakers CB1 and/or CB2, if necessary (see Section 2-12).
Unit overheated. Allow unit to cool with fan on (see Section 2-2).
Check fuseable link (see Section 4-2).
Have Factory Authorized Service Agent check control relay CR1.
Check for proper input connections (see Section 2-15).
Check for proper jumper link positions (see Section 2-14).
Check for and remove anything blocking fan blades.
Have Factory Authorized Service Agent check fan motor FM.
Check for proper jumper link positions (see Section 2-14).
Check and replace open line fuse(s) (see Section 2-15).
Check for proper input connections (see Section 2-15).
Check for proper jumper link positions (see Section 2-14).
Check for proper jumper link positions (see Section 2-14).
Check for proper input connections (see Section 2-15).
Select correct size weld cables (see Section 2-10).
Clean and tighten weld cable connections (see Section 2-10).
Have Factory Authorized Service Agent adjust brush contact on slide wire.
For 250 ampere models, check tap slope connections (see Section 2-8).
For 300 ampere models, check inductance connections (see Section 2-9).
Install wire feeder according to it's Owner's Manual.
Reset circuit breaker CB2, if necessary (see Section 2-12).
Check fuseable link (see Section 4-2).
Remedy