User guide

TM-428 Page 20 Miller Legend
6-3. Troubleshooting Circuit Diagram For W elding Generator W ith Optional Remote Control
Test Equipment Needed:
Resistance Values
a) Tolerance
– ± 10% unless specified
b) Condition – 70°F (21°C); cold
machine (no warm-up)
c) Wiring Diagram – see Section 9
d) Stop engine before checking
resistance
R1 29 ohms
R2 34 ohms
R3 35 ohms
R4 2 ohms
R5 2 ohms
R6 thru R17 Less than 1 ohm
CR2 energized
Field current
at weld rpm
Throttle
control relay
control relay CR3
and auxiliary power
control relay CR4
energized at
power/idle rpm
V14/R17
V15
V16/ V17/
R1 R2
I1
I2
V1 1, V12,
V13/R12
V18
V19
R16 R15
R14
R13
Field flashing
disconnect relay CR5
See Section
6-11
for PC3 data
See Section 6-13
for PC5 data
See Section 6-5
for PC1 data
See Section
6-16 for R2 and
R4 adjustment