© Mitsubishi Forklift Trucks 2013. All
© Mitsubishi Forklift Trucks 2013. All
rights reserved.
rights reserved.
Revision: B
Revision: B
Document ID: 615023
Document ID: 615023
156 (244)
156 (244)
PBV20N2
PBV20N2
Service
Service Manual
Manual
CODE
CODE
TRUCKTOOL
TRUCKTOOL
AND
AND
DISPLAY
DISPLAY
DESCRIPTION
DESCRIPTION
29
29
Pump motor output voltage error (high)
Pump motor output voltage error (high)
PUMP VMN HIGH
PUMP VMN HIGH
(Alarm)
Stored
(Alarm)
Stored
This test is carried out when
This test is carried out when the pump motor is turning. The
the pump motor is turning. The alarm indicates that the pump
alarm indicates that the pump
motor output is higher than
motor output is higher than expected.
expected.
In such a case, check the following:
In such a case, check the following:
•
•
Motor connections
Motor connections
•
•
If the motor windings or cables have leakages to
If the motor windings or cables have leakages towards the truck frame
wards the truck frame
If no problems are found
If no problems are found on the motor, the problem is
on the motor, the problem is in the COMBIAX controller.
in the COMBIAX controller.
30
30
Traction motor output voltage error
Traction motor output voltage error
(low)
(low)
VMN LOW
VMN LOW
(Alarm)
Stored
(Alarm)
Stored
Cause 1: Startup test
Cause 1: Startup test
Before switching the main contactor on, the
Before switching the main contactor on, the software checks the power bridge. It turns the high
software checks the power bridge. It turns the high
side power mosfets on one by one
side power mosfets on one by one and expects the phase voltage to
and expects the phase voltage to increase toward the rail
increase toward the rail
capacitor value. If the phase voltage does
capacitor value. If the phase voltage does not increase, this alarm occurs.
not increase, this alarm occurs.
In such a case (the main contactor does not
In such a case (the main contactor does not close at all), check the following:
close at all), check the following:
•
•
Motor internal connections (ohmic continuity)
Motor internal connections (ohmic continuity)
•
•
Motor power connections
Motor power connections
•
•
Motor leakage to the truck frame
Motor leakage to the truck frame
If the motor connections are OK, the
If the motor connections are OK, the problem is in the COMBIACX controller.
problem is in the COMBIACX controller.
Cause 2: Motor running test
Cause 2: Motor running test
When the motor is running and the power bridge is on, the motor voltage feedback is tested. If
When the motor is running and the power bridge is on, the motor voltage feedback is tested. If
the motor voltage feedback is lower than
the motor voltage feedback is lower than commanded value, this alarm occurs.
commanded value, this alarm occurs.
In such a case, check the following:
In such a case, check the following:
•
•
Motor connections
Motor connections
•
•
Whether the motor’s phase windings or cables have leakages towards the t
Whether the motor’s phase windings or cables have leakages towards the truck frame
ruck frame
•
•
That the main contactor closes properly, with a
That the main contactor closes properly, with a good contact.
good contact.
If no faults are
If no faults are found, the problem is in
found, the problem is in the COMBIACX controller.
the COMBIACX controller.
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