Miller Big Blue Duo Pro 700 X Owner's Manual page 66

Trouble
Low open-circuit voltage.
No remote fine amperage or voltage
control.
Constant speed wire feeder does not
work.
Low CV weld output.
Min or max CV weld output only.
B. Standard Generator Power
Trouble
No generator power output at AC re-
ceptacles; weld output okay.
No generator power or weld output.
High output at generator power AC
receptacles.
Low output at generator power AC
receptacles.
C. Three-Phase Generator Power
Trouble
No or low output at three-phase gener-
ator/receptacle RC5.
High output at three-phase generator/
receptacle RC5.
Erratic output at three-phase genera-
tor/receptacle RC5.
D. Engine
Trouble
Engine will not crank.
Engine cranks but does not start.
OM-282302 Page 62
Check engine speed, and adjust if necessary.
Check fuses F1 and F2, and replace if open (see Section 8-8). Have Factory Authorized Service
Agent check integrated rectifier SR2, capacitor C6, and the rotor.
Check engine speed, and adjust if necessary.
Check position of Process/Contactor switch.
VRD is on.
Check and secure connections to Remote receptacle (see Section 5-9).
Repair or replace remote control device.
Have Factory Authorized Service Agent check current sensing devices, and connections.
Reset supplementary protector CB9 or CB29 (see Section 8-8).
Check and secure connections to Remote receptacle (see Section 5-9).
Repair or replace wire feeder.
Increase Voltage/Amperage Adjust Control setting.
Check position of Voltage/Amperage Adjust control and Process/Contactor switch.
Repair or replace remote control device.
Reset receptacle supplementary protectors. Reset GFCI receptacle.
Disconnect equipment from generator power receptacles during start-up.
Check fuses F1 and F2, and replace if open (see Section 8-8). Have Factory Authorized Service
Agent check integrated rectifiers SR1 and SR2, capacitor C6, and the rotor.
Reset supplementary protector CB4. Have Factory Authorized Service Agent check integrated recti-
fier SR1 .
Have Factory Authorized Service Agent check brushes and slip rings, and field excitation circuit.
Check engine speed, and adjust if necessary.
Have Factory Authorized Service Agent adjust generator power field current resistor R3.
Check engine speed, and adjust if necessary.
Check fuse F1, and replace if open (see Section 8-8). Have Factory Authorized Service Agent check
integrated rectifier SR2, resistor R3, and capacitor C6.
Have Factory Authorized Service Agent check brushes and slip rings.
Reset supplementary protector CB1 (see Section 8-8).
Check engine weld/power speed, and adjust if necessary (see Section 8-6).
Have Factory Authorized Service Agent check brushes and slip rings.
Check engine weld/power speed, and adjust if necessary (see Section 8-6).
Have Factory Authorized Service Agent check brushes and slip rings.
Supplementary protector CB2 open. Reset CB2.
Check battery connections and tighten if necessary. Check battery, and replace if necessary.
Circuit breaker CB10 may be open. CB10 automatically resets when fault is corrected (see Section 8-
8). Have Factory Authorized Service Agent check engine wiring harness and components.
Check engine wiring harness plug connections.
Have Factory Authorized Service Agent check control relay CR5 and Engine Control switch S1.
Check fuel level.
Remedy
Remedy
Remedy
Remedy