Miller Electric Big 40 CAT manual Standard Generator Power, Engine

Trouble	Remedy
Min or max CV weld output only.	Check position of Voltage/Amperage Adjust control and Voltage/Amperage Adjust switch.
	Repair or replace remote control device.
	Have Factory Authorized Service Agent check field current regulator board PC1.

C. Standard Generator Power

Trouble	Remedy
No generator power output at ac recep-	Reset receptacle circuit breakers.
tacles; weld output okay.
No generator power or weld output.	Disconnect equipment from generator power receptacles during start-up.
	Check fuses F1 and F2, and replace if open (see Section 9-8). Have Factory Authorized Service Agent
	check integrated rectifier SR1, capacitor C9, and the rotor.
	Reset circuit breaker CB12. Have Factory Authorized Service Agent check diode D1 (CC models) or field
	current regulator board PC1 (CC/CV models) (see Section 9-8).
	Have Factory Authorized Service Agent check brushes and slip rings, and field excitation circuit.
High output at generator power ac re-	Check engine speed, and adjust if necessary.
ceptacles.
	Have Factory Authorized Service Agent adjust generator power field current resistor R3.
Low output at generator power ac recep-	Check engine speed, and adjust if necessary.
tacles.
	Check fuse F1, and replace if open (see Section 9-8). Have Factory Authorized Service Agent check inte-
	grated rectifier SR1, resistor R3, and capacitor C9.
D. Optional Three-Phase Generator Power (CC/CV Models)

Trouble	Remedy
No or low output at optional three−	Place Process/Contactor switch in Electrode Hot - Stick position (see Section 7-3).
phase generator/receptacle RC5.
	Reset circuit breaker CB7(see Section 8-2).
	Reset circuit breaker CB5 (see Section 9-8).
	Check engine weld/power speed, and adjust if necessary (see Section 9-6).
	Have Factory Authorized Service Agent check brushes and slip rings, and field current regulator board
	PC1.
High output at optional three−phase	Check engine weld/power speed, and adjust if necessary (see Section 9-6).
generator/receptacle RC5.
	Have Factory Authorized Service Agent check field current regulator board PC1.
Erratic output at optional three−phase	Have Factory Authorized Service Agent check brushes and slip rings, and field current regulator board
generator/receptacle RC5.	PC1.
E. Engine

Trouble	Remedy
Engine will not crank.	Check battery, and replace if necessary.
	Check battery connections and tighten if necessary.
	Circuit breaker CB10 may be open. CB10 automatically resets when fault is corrected (see Section 9-8).
	Have Factory Authorized Service Agent check engine wiring harness and components.
	Check engine wiring harness plug connections.
	Have Factory Authorized Service Agent check Engine Control switch S1.
OM-4406 Page 52	Return To Table Of Contents