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CIRCUIT PROTECTION
FIELD CIRCUIT FUSE. This 1/2 amp slow blow fuse, located on the Relay PC board, protects the field cir- cuit. It will blow if the field shorts or if one of the field circuit components on the Relay PC board fails.
MOTOR THERMAL PROTECTION. The temperature sensing thermal protector mounted in the motor opens the relay circuit when the motor overheats because of excessive loading or frequent triggering. This protects the motor without nuisance tripping. The thermal pro- tector automatically resets itself after the motor cools sufficiently (may take
CIRCUIT BREAKER. The 5 amp circuit breaker locat- ed above the drive rolls normally trips only when an overload occurs because of excessive loading in the wire feed cable, or a defective motor or control com- ponent. After allowing a minute for cooling, push the reset button and weld. If it trips again, be sure the wire feed cable is clean and the proper size for the wire diameter being fed. If it still trips, look for a defective electrical component.
AVOIDING GROUND LEAD PROTECTOR (GLP) ACTIVATION
The frame of the
When the protector is tripped, the welding contactor in the power source will not close when the gun trigger is pressed.
DO NOT allow the electrode to contact the case of the wire feeder or the uninsulated part of the wire reel stand when the gun trigger is activated.
Be sure that all work lead connections to the work make tight
DO NOT allow excess input cable or work cable to be placed closer than three feet from the wire feeder.
DO NOT coil excess input cable assembly or use a coiled assembly as shipped from the factory. Instead, loop the excess cable length back and forth in three to six foot straight lengths. Coiling the input cable results in a transformer action between the electrode conductor cable and the ground lead in the multiconductor control cable. This transformer action can cause a current to flow in the ground lead which will falsely activate the GLP circuit.
To reset the GLP circuit, press the white button above the drive motor and to the right of the circuit breaker.
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