Troubleshooting - Miller Bobcat 250 Owner's Manual

8-9.

Troubleshooting

A. Welding Troubleshooting
Trouble
Low or no weld output; generator
power output okay at AC receptacles.
No weld output or generator power
output at AC receptacles.
Low weld output.
High weld output.
Erratic weld output.
B. Generator Power Troubleshooting
Trouble
No or low generator power output at
AC receptacles; weld output okay.
No generator power or weld output.
Low power output at AC receptacles.
High power output at AC receptacles.
OM-249336 Page 46
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Complete Parts List is available at www.MillerWelds.com
Check control settings.
Check weld connections.
Check fuse F2, and replace if open (see Section 8-5).
Have Factory Authorized Service Agent check brushes, slip rings, and integrated rectifiers SR2 and
SR3.
Be sure all equipment is disconnected from receptacles when starting unit.
Check fuses F1 and F2, and replace if open (see Section 8-5).
Check plug PLG6 connection.
Have Factory Authorized Service Agent check brushes, slip rings, and integrated rectifiers SR2,
SR3.
Check fuse F2, and replace if open (see Section 8-5).
Check control settings.
Check engine speed, and adjust if necessary (see Section 8-7 or 8-8).
Service air cleaner according to engine manual.
Have Factory Authorized Service Agent check brushes, slip rings, and integrated rectifiers SR2,
SR3.
Check control settings.
Check engine speed, and adjust if necessary (see Section 8-7 or 8-8).
Check control settings.
Tighten and clean connections to electrode and workpiece.
Use dry, properly-stored electrodes for Stick and TIG welding.
Remove excessive coils from weld cables.
Clean and tighten connections both inside and outside welding generator.
Check engine speed, and adjust if necessary (see Section 8-7 or 8-8).
Have Factory Authorized Service Agent check brushes, slip rings, and integrated rectifiers SR2,
SR3.
Reset supplementary protector(s) (see Section 7-1).
Press optional GFCI receptacle Reset button (see Section 7-1).
Check fuse F1, and replace if open (see Section 8-5).
Check plug PLG6 connection.
Have Factory Authorized Service Agent check brushes, slip rings, and integrated rectifier SR3.
Be sure all equipment is disconnected from receptacles when starting unit.
Check fuses F1 and F2, and replace if open (see Section 8-5).
Check plug PLG6 connection.
Have Factory Authorized Service Agent check brushes, slip rings, and integrated rectifiers SR2 and
SR3.
Check fuse F1, and replace if open (see Section 8-5).
Increase Fine control R1 setting to max.
Check engine speed, and adjust if necessary (see Section 8-7 or 8-8).
Remedy
Remedy