JLG M600 Service Manual - Manual (Page 186)

SECTION 6 - JLG CONTROL SYSTEM
6-20 – JLG Lift – 3121813
7/7 Flash code 7/7 indicates problems with a motor.
CAPACITOR BANK FAULT - CHECK POWER/MOTOR WIRING
The capacitor bank is not charging. This is probably due to a motor or power wiring error causing illegal current drain; it could also be
due to a very low battery supply.
OPEN-CIRCUIT PUMP MOTOR
Pump point A is collapsing when the pump MOSFETs are pulsed. This is probably due to an open circuit pump motor or a power wiring
error.
WARNING:
If the power wiring between the power module & contactor panel is wrong, this fault can occur – any attempt to operate the vehicle
could damage the power module.
OPEN-CIRCUIT DIRECTION CONTACTOR OR TRACTION MOTOR
Traction point A is collapsing when the traction MOSFETs are pulsed. This is probably due to an open circuit traction motor or direc-
tional contactor or wiring error.
NOTE: This fault is unlikely to be seen due to interaction with speed control …
PUMP POINT A LOW - CHECK POWER / MOTOR WIRING
Pump point A is near 0V when the pump MOSFETs are off. This is probably due to a motor or power wiring error.
STALLED TRACTION MOTOR
The power module traction MOSFET protection circuit is active. This is due to massive current drain and could be a stalled traction
motor or a power wiring error.
7/7 Flash code 7/7 indicates problems with a motor (continued).
STALLED PUMP MOTOR
The power module pump MOSFET protection circuit is active. This is due to massive current drain and could be a stalled pump motor
or a power wiring error.
TRACTION MOTOR OVERLOADED
The traction motor is drawing Excessive current for an extended period of time; the system shuts down to prevent destruction of the
motor or power module.
PUMP MOTOR OVERLOADED
The pump motor has been operating in current limit at a low percentage on for a period of time greater than 10 seconds
TRACTION CURRENT AT ZERO - CHECK SHUNT WIRING
Traction current measurement is at zero. This is probably due to an open-circuit between the current measurement shunt and the
power module.
TRACTION POINT A HIGH - CHECK POWER / MOTOR WIRING
Traction point A is near battery supply when neither direction contactor is energized and the traction MOSFETs are off. This could be
due to a welded direction contactor or a power wiring error.
TRACTION POINT A LOW - CHECK POWER / MOTOR WIRING
Traction point A is near 0V when neither direction contactor is energized and the traction MOSFETs are off. This could be due to a power
wiring error.
Table 6-5. Help Descriptions and Fault Flash Codes