Troubleshooting - Miller Electric Legend 301 G Owner's Manual

8-7. Troubleshooting

A. Welding
Trouble
No weld output.
Low weld output.
High weld output.
Weld output cannot be adjusted.
Erratic weld output.
No remote fine amperage control.
No 24 volt ac output at Remote
receptacle RC4.
No 115 volt ac output at Remote
receptacle RC4.
OM-4411 Page 34
Check control settings.
Check weld connections.
Disconnect equipment from generator power receptacles during start-up.
Place V/A Adjust switch in Panel position, or move switch to Remote position and connect remote
control to Remote receptacle RC4 (see Sections 5-8 and 6-1).
Check and secure connections to Remote receptacle RC4 (see Sections 5-8).
Check fuse F1 on circuit board PC7, and replace if necessary (see Section 8-6).
Have Factory Authorized Service Agent check brushes, slip rings, and circuit boards PC1 and PC2.
Check weld control settings.
Change position of Engine Control switch and Speed Control switch to achieve desired engine speed.
Place V/A Adjust switch in Panel position, or move switch to Remote position and connect remote
control to Remote receptacle RC4 (see Sections 5-8 and 6-1).
Check and clean air cleaner as necessary (see Section 8-4).
Have Factory Authorized Service Agent check brushes, slip rings, and circuit boards PC1 and PC2.
See engine manual.
Check control settings.
Check for obstructed movement of solenoid linkage.
Have Factory Authorized Service Agent check circuit boards PC1, PC2, and PC7.
Check position of V/A Adjust switch (see Section 6-1).
Have Factory Authorized Service Agent check field current control board PC2.
Check control settings.
Clean and tighten connections both inside and outside unit.
Be sure connection to work piece is clean and tight.
Remove excessive coils from weld cables.
Use dry, properly stored electrodes.
Have Factory Authorized Service Agent check brushes, slip rings, and circuit boards PC1 and PC2.
Place V/A Adjust switch in Remote position (see Section 6-1).
Check and tighten connections to Remote receptacle RC4 (see Section 5-8).
Reset circuit breaker CB5 (see Section 8-6).
Check fuse F2, and replace if open (see Section 8-6).
Remedy