LTC Repair Lombardini Engine Troubleshooting - Wacker Neuson

Electrical Troubleshooting Procedures LTC Repair
6.12 Checking the Excitation Capacitor
See Graphic: wc_gr003520
WARNING
Electric shock hazard. Only qualified personnel should conduct this
test.
The excitation capacitor (a) is mounted inside the control panel.
To check the excitation capacitor, carry out the following procedure:
6.12.1 Turn off the lights and shut down the machine.
6.12.2 Remove the screws that secure the control panel cover to the control
box.
6.12.3 Remove the leads from the capacitor and discharge it by placing the
blade of an insulated screwdriver across the two spades of the
capacitor.
6.12.4 Using a multimeter set to the Farad (F) or capacitance (C) scale (200
µF), measure the capacitor’s capacitance. The capacitor should
measure 25±1.25 µF on 60Hz machines; 35±1.25 µF on 50Hz
machines.
If the reading is not within this range, replace the capacitor.
If the capacitor measures within the above range, it is OK.
An alternative capacitor check is to set the multimeter to the 10,000
Ohm scale when checking the capacitor. Observe the reading. If the
reading starts out very low (5.0 Ohms) and continues to climb to an
overload or open reading, the capacitor may be OK. Double check by
installing the capacitor in a known-to-be-working Light Tower. If the
known-to-be-working Light Tower operates correctly, the capacitor is
OK. A second alternative check would be to try a known-to-be-working
capacitor in the original Light Tower. If the Light Tower still does not
produce power, the problem is within the generator.
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