Miller Electric Big Blue 400P, Big Blue 500 X manual Standard Generator Power

Trouble	Remedy
No remote fine amperage or voltage	Repair or replace remote control device.
control.
	Have Factory Authorized Service Agent check PC1 sensing leads (36 and 37), and connections.
Constant speed wire feeder does not	Reset supplementary protector CB5 or CB6 (see Section 9-8).
work.
	Check and secure connections to Remote 14 receptacle RC14 (see Section 5-11).
	Repair or replace wire feeder.
Low CV weld output.	Set Ampere Range switch to highest range.
	Increase Voltage/Amperage Adjust Control setting.
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 Amperage/Voltage Adjust Control R1, and field current
	regulator board PC1.
C. Standard Generator Power

Trouble	Remedy
No generator power output at ac recep-	Reset receptacle supplementary protectors.
tacles; weld output okay.
	Reset GFCI receptacle.
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, diode/capacitor board D1/C1, and the rotor.
	Reset supplementary protector CB12. Have Factory Authorized Service Agent check diode D1 .
	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 have engine manufacturer’s factory authorized service agent adjust if neces-
ceptacles.	sary. See Section 9-6for idle speed adjustment.
	Have Factory Authorized Service Agent adjust generator power field current resistor R3.
Low output at generator power ac recep-	Check engine speed, and have engine manufacturer’s factory authorized service agent adjust if neces-
tacles.	sary. See Section 9-6for idle speed adjustment.
	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 Only)

Trouble	Remedy
No or low output at optional three-	Place Process/Contactor switch in Weld Terminals Always On - Stick position (see Section 7-3).
phase generator/receptacle RC5.
	Reset supplementary protector CB7(see Section 8-2).
	Reset supplementary protector CB5 (see Section 9-8).
	Check engine speed, and have engine manufacturer’s factory authorized service agent adjust if nec-
	essary. See Section 9-6for idle speed adjustment.
	Have Factory Authorized Service Agent check brushes and slip rings, and field current regulator board
	PC1.
High output at optional three-phase	Check engine speed, and have engine manufacturer’s factory authorized service agent adjust if nec-
generator/receptacle RC5.	essary. See Section 9-6for idle speed adjustment.
	Have Factory Authorized Service Agent check field current regulator board PC1, and PC1 voltage
	feedback circuit.
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.

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