Yes - Polaris GEM E Series Service Manual

DRIVE AND POWER SYSTEM (Continued)
Step
6 Apply foot brake, turn the key on, release emergency
brake, momentarily step on accelerator pedal and
measure the voltage between the white wire
connected to the contactor coil and 72 volt negative
terminal at PSDM.
Is there approximately 72 volts DC?
7 Measure the voltage on the black/green wire on the
contactor, turn the key on, apply foot brake, release
parking brake, momentarily depress accelerator
pedal.
Does voltage go from 72 volts to 0 volts?
8 Turn the master disconnect switch off.
ohmmeter and measure the resistance at the
black/green wire connected to the main contactor coil
and pin 17 of the 23-pin connector on the top of the
motor controller.
Is the resistance approximately 0 ohm?
9 Steps 8a through 8c will verify critical inputs to the
motor controller. Each must be present before the
motor controller will close the main contactor.
Are all critical inputs good?
9a With the key and the master disconnect switch in the
ON position, measure the voltage between pin 1 of
the 23-pin connector on the top of the motor
controller and the 72-volt negative terminal on the
controller.
Is the voltage approximately 72 VDC?
9b Measure the voltage at pin 2 of the 23-pin connector
with the key switch in the ON position.
Is the voltage approximately 72 VDC?
9c Turn the master disconnect switch OFF.
Use an ohmmeter, measure the resistance at the
PSDM -72 VDC terminal and the motor controller 72
VDC ground.
Is the resistance approximately 0 ohms?
10 Turn the key switch ON and measure the voltage at
the PSDM connector J5 pin A.
Is the voltage approximately 72 VDC?
November 2007
Action
Use an

Yes

Proceed to Step 7.
Replace the contactor.
Proceed to Step 9.
Replace the motor
controller.
Proceed to Step 9b.
Proceed to Step 9c.
All critical inputs (for
contactor operation)
are good.
Replace the harness
between the PSDM and
the main contactor coil.
Refer to the Main
Contactor Circuit
Diagram.
ELECTRICAL 5 - 14
No
Proceed to Step 10.
If voltage on the
back/green wire stays
at 72 volts proceed to
Step 8.
Replace controller
wire harness.
Troubleshoot
circuit(s) suggested in
Steps 9a through 9c.
Use the Main
Contactor Circuit
Diagram to determine
where the constant
72 VDC to the
controller has been
lost.
Use the Main
Contactor Circuit
Diagram to determine
where the constant
72 VDC to the
controller has been
lost.
Replace the wire
between the PSDM
-72 VDC terminal and
the motor controller.
Proceed to Step 10a.
GEM Service Manual