Miller MSW-41 - Troubleshooting Circuit Diagram For 1.5 & 2.5 KVA, 220 Volts Models

TM-716 Page 17MSW And LMSW Series
6-4. Troubleshooting Circuit Diagram For 1.5 And 2.5 KVA, 220 Volts Models
Resistance Values
a) Tolerance − 10% unless specified
b) Turn Off unit and disconnect plug
before checking resistance
R1 1.5 kVA, 220 V model: 1.1 ohms
2.5 kVA, 220 V model: 0.8 ohms
Test Equipment Needed:
072 065-C
Voltage Readings
a) Tolerance − 10% unless specified
b) Reference − as indicated
c) Wiring Diagram − see Section 8
V1 230 volts AC
V2 230 volts AC with S1 closed
V3 115 volts AC with S1 closed
V4 115 volts AC with PB1 closed
V5 115 volts AC with PB1 closed and TD1 not
timed out
V6 230 volts AC with W energized
V7 1.5 kVA, 220 V model: 1.6 volts AC
open-circuit voltage
2.5 kVA, 220 V model: 2.5 volts AC
open-circuit voltage
A, B
V7
See Section
6-5 for
waveforms A, B
V6/R1
V3 V4
V1 V2
V5
V4
V3
Contactor W