LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson

Electrical Troubleshooting Procedures LTC Repair
6.21 Checking Individual Circuit Breakers
See Graphic: wc_gr003073
WARNING
Electric shock hazard. Only qualified personnel should conduct this
test. Do not perform this test if you or the machine are wet.
Complete this test with the machine running. Test power to all circuit
breakers or just the circuit breaker in question.
6.21.1 Unplug the light(s) at the upper mast quick-disconnect plugs or
disconnect the lights at the junction box.
6.21.2 Remove control panel front cover.
6.21.3 Place the main circuit breaker in the ON position.
6.21.4 Using the AC voltage setting on the multimeter, test for 230V±10%
incoming voltage by measuring across the input wires (a) (R/B, R, Br,
or Br/Y (Br/W on some models)) at the back of the circuit breaker(s)
and the wires at the terminal strip (b).
If 230V±10% is not measured, it indicates a problem with voltage
reaching the circuit breaker. Check the continuity of the wiring
between the terminal strip and the circuit breaker. Repair or
replace the wiring as needed.
If 230V±10% is measured at the circuit breaker, continue.
6.21.5 Place the circuit breaker being tested in the ON position and measure
the voltage between the outgoing side of the circuit breaker (c) and the
wires at the terminal strip (b).
If 230V±10% is not measured, it indicates a problem with the
circuit breaker. Check the continuity of the circuit breaker.
Replace the circuit breaker if needed.
If 230V±10% is measured, voltage is being supplied through the
circuit breaker. Continue troubleshooting by checking the function
of control panel capacitors. See section Checking Incoming
Voltage to Control Panel Capacitor(s).
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