Miller TM-268 Technical Manual - Page 15

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Miller TM-268 Technical Manual
Trouble
High generator output at platform AC
receptacles.
Erratic generator output at platform AC
receptacles.
Notes
Belt Driven Generator
Verify generator is running at 3600 rpm (60 Hz) or 3000 rpm (50 Hz).
Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if indicated. See
Section 8-8.
Check power board PC1 and connections. Check rotor PWM voltage (see Section 8-2 and 8-4) and re-
place if indicated.
Check control board PC2 and connections, and replace if indicated (see Section 8-6).
Check and secure electrical connections at platform, generator, and control box.
Verify generator is running at 3600 rpm (60 Hz) or 3000 rpm (50 Hz).
If generator voltage is approximately 60 volts (instead of normal 230−240 volts AC), replace control board
PC2.
Check circuit breaker CB1 for loose terminals. Check continuity across poles of CB1. Reset or replace
CB1 (see Section 4-2).
Check slip rings, wiring to brushes, and brush position on slip rings. Install new brushes if indicated. See
Section 8-8.
Disconnect leads 12 and 13 from brushes, and check continuity across slip rings nominal reading is 26
ohms). Replace generator if rotor is open.
Check power board PC1 and connections, and replace if indicated (see Section 8-4).
Check control board PC2 and connections, and replace if indicated (see Section 8-6).
Remedy
TM-268 819 Page 13