4.27 CONTACTOR PROTECTIVE RESISTOR MAINTENANCE.
This task covers:
General Mechanics Tool Kit
(item 2, appendix B)
Automotive Fuel and Electrical System Repair, Tool
Kit (item 3, appendix B)
Shut down Generator Set
150 paragraph 2.8.1.
The Generator Sets 150 kW produce lethal voltages.
Turn off power to the EPP III or Generator Set 150 kW before
performing any installation, removal, disassembly, or
Wear protective gloves when performing any work on main
assemblies of the EPP III.
Label all cables before removing electrical or electronic assemblies or
This procedure is the same for all resistors R3 to R6 (Example R3).
The resistor serves as a protective resistor for the coil, when the
contactor is excited.
Remove stanchion by PDU (1, figure 4-41).
Open access door (2) and secure with prop (3).
c. Install stanchion.
To replace any one of these resistors, all resistors to the right of the
one to be replaced must be removed first ot allow access to rear cable
Remove cables 119 through 127 on the bottom of power contactors K4, K5, K6. Refer to
paragraph 5.10 and remove cables from power contactors K4, K5, K6.