User guide

TM-428 Page 16 Miller Legend
B. 50 Or 60 Hz Auxiliary Power
Trouble Remedy
No auxiliary power output at recep-
tacles RC1, RC2, or RC3.
Run engine at power/idle speed.
Reset circuit breakers CB1 and CB2. Effective with Serial No. KE629034, also reset circuit breakers
CB5
and CB7 (see Section 4-3).
Check receptacles RC1, RC2, RC3 for continuity and proper connections. Replace receptacle(s) if nec -
essary.
Check connections to terminal strip 1T .
Clean slip rings, and install new brushes if necessary (see Section 6-15).
Check coil voltage and connections of control relay CR4. Check continuity of coil and condition of con -
tacts. Replace CR4 if necessary.
Check diode D4, and replace if necessary .
Check idle board/module PC1 and connections (see Section 6-5).
Check control transformer T1 for signs of winding failure. Check continuity across windings, and check
for proper connections. Check primary and secondary voltages. Replace T1 if necessary .
Disconnect leads 21, 23, and 33 from brushes, and check continuity across slip rings. Replace rotor
if necessary.
Disconnect leads 48 and 49 from voltage regulator board PC2, and check continuity between leads 48
and 49. Disconnect leads 50, 51, 52, and 53 from stator . Check continuity between leads 50 and 51,
and 52 and 53. Replace stator if necessary .
Low auxiliary power output. Check connections to terminal strip 1T .
Clean slip rings, and install new brushes if necessary (see Section 6-15).
Check integrated rectifier SR2, and replace if necessary .
Check coil voltage and connections of control relay CR3. Check continuity of coil and condition of con -
tacts. Replace CR3 if necessary.
Check voltage regulator board PC2 and connections, and replace if necessary .
High auxiliary power output. Check engine speed, and adjust if necessary .
Check voltage regulator board PC2 and connections, and replace if necessary (see Section 6-9).
C. 100 Hz Auxiliary Power
Trouble Remedy
No auxiliary power output at receptacle
RC4.
Run engine at weld speed.
Reset circuit breaker CB3 (see Section 4-1).
Check receptacle RC4 for continuity and proper connections. Replace receptacle if necessary .
Disconnect leads 90, 91, 92, and 93 from stator . Check continuity between leads 90 and 91, and 92 and
93. Replace stator if necessary.
Check diode D4, and replace if necessary .