WACKER Group LTC 4 - Checking Receptacle’s Circuit Breaker

Electrical Troubleshooting Procedures LTC Repair
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7.38 Checking Receptacle’s Circuit Breaker
See Graphic: wc_gr003100
Electric shock hazard. Only qualified personnel should conduct this
test.
Complete this test with the machine running.
7.38.1 Using the AC voltage setting on the multimeter, measure the incoming
voltage to the receptacle’s circuit breaker by measuring between the
black-yellow wire (a) and the neutral wires (b) of the terminal strip.
There should be 120V±10%.
• If 120V±10% is not measured, the receptacle’s circuit breaker is
not receiving voltage. Check the condition of the wiring between
the receptacle’s circuit breaker and the terminal strip. Repair/
replace the wiring as needed.
• If 120V±10% is measured, continue.
7.38.2 Make sure the receptacle’s circuit breaker is in the “ON” position.
7.38.3 Measure the outgoing voltage from the receptacle’s circuit breaker by
measuring between the black-yellow wire (c) and the neutral wires (b)
of the terminal strip. There should be 120V±10%.
• If 120V±10% is not measured, the receptacle’s circuit breaker is
not functioning. Confirm that receptacle’s circuit breaker is mal-
functioning by checking its continuity. Replace the circuit breaker
if needed.
• If 120V±10% is measured, continue troubleshooting by checking
the earth-leakage circuit breaker.
WARNIN
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