A Motor Controller - Genie Z-30/20N Service Manual

June 2011
REV A
10-1
Motor Controller
The drive motor controller is located under the non-
steer end drive chassis cover. The drive motor
controller can recognize machine drive
malfunctions and display controller fault codes by
flashing a LED at the ground controls and on the
motor controller. See the Fault Code section of this
manual for a list of fault codes and additional
information. There are no adjustments needed on
the drive joystick controller. For further information
or assistance, consult the Genie Industries Service
Department.
How to Test the Motor Controller
Note: Use the following procedure to test the motor
controller. If the motor controller is found to be
faulty, note which test failed and which fault code
(if any) was present at the time of failure.
1 Turn the key switch to the off position and
disconnect the battery packs from the machine.
2 Tag and disconnect all power cables from the
motor controller.
Electrocution/burn hazard. Contact
with electrically charged circuits
could result in death or serious
injury. Remove all rings, watches
and other jewelry.
3 Press the release tab on the motor controller
harness connector and remove the motor
controller harness connector from the motor
controller.
4 Set an ohmmeter to diode test mode.
Part No. 139378 Z-30/20N • Z-30/20N RJ • Z-34/22 • Z-34/22N
Section 4 • Repair Procedures
Motor Controller
5 Connect the leads from an ohmmeter to test
each motor controller terminal combination
listed below and check the forward / reverse
bias (diode test).
Result: All desired results must be within the
specified range. If any test has a result not
within the specified range, replace the motor
controller.
Forward Bias:
Test
Positive Lead Negative Lead
M- B+
B- M-
F1 B+
F2 B+
B- F1
B- F2
Reverse Bias:
Test
Positive Lead Negative Lead
B+ M-
M- B-
B+ F1
B+ F2
F1 B-
F2 B-
Desired result
0.4 to 0.45
0.4 to 0.45
0.45 to 0.5
0.45 to 0.5
0.45 to 0.5
0.45 to 0.5
Desired result
Rises to .0L V
Rises to .0L V
Rises to .0L V
Rises to .0L V
Rises to .0L V
Rises to .0L V
4 - 45