Terex Genie AL5HT, Руководство по обслуживанию

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May 2015 Service Manual
Generator
Part No. 1265482 AL5HT 59
8-3
How to Check a Generator Diode
High voltage. Exposure to
electrical wires or electrical
current will result in death or
serious injury. Turn off all power
when not needed for testing. Use
extreme caution when working
with high voltage electrical
components.
Electrocution/burn hazard.
Attempting to service the
machine before the capacitor is
fully discharged will result in
death or serious injury.
Note: Be sure the engine has been turned off for at
least 15 minutes before servicing the machine. Use
a voltmeter to confirm there is no residual voltage
in the capacitor.
1 Remove the fasteners securing the end
cover/bearing housing to the generator.
Remove the cover.
2 Locate the diode at the end of the generator.
3 Tag and disconnect the positive wire lead from
the diode.
4 With a multimeter set to test diodes, connect
one multimeter lead to the diode terminal and
the other multimeter lead to the 'Q' lead
terminal of the generator. Note the results.
Note: Refer to the instructions which are provided
for your multimeter to ensure the diode is
accurately tested.
5 Reverse the multimeter lead connections.
Note the results.
Result: The two readings are at a ratio of
3000:1 or higher. The diode is good.
Result: The two readings are at a ratio of less
than 3000:1. The diode is faulty and should be
replaced.
Note: Before installing a new diode, clean the
surface of the exciter rotor core, and run a bead of
a thermal-electrical compound around the base of
the diode (the threads of the diode should not be
coated). Torque to 20 to 30 in-lbs / 2.2 to 3.4 Nm.