Table 4-2. Troubleshooting-Continued
TEST OR INSPECTION
Remove and disassemble the welder.
Dynamotor-Welder Does Not Develop Welding Current.
Check the brush tension, and for burned or worn brushes.
Remove and disassemble the welder and inspect for the interpole
coils, compound coils, field coils, commutator, DC resistance
element, and the armature.
Remove and correct as necessary. Clean commutator. Adjust exciter
brush tension or replace brushes (paras. 13-1 through 13-10).
Dynamotor-Welder Does Not Furnish Alternating Current.
Remove and disassemble welder to inspect the rotating coils for excitation
voltage, damaged field, and/or defective stator coils.
Repair, replace, or adjust brush tension as necessary (paras. 13-1
Dynamotor-Welder Will Not Function As A Motor (External Power).
Remove and disassemble welder to inspect the stator coils, armature, and
main contactor switch.
Dynamotor-Welder Exciter Does Not Furnish Excitation Voltage Or Voltage
Is Below Required Level.
Inspect for burned and badly worn brushes.
Remove and disassemble welder to check for dirty commutator
and defective field coils and armature.