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© Mitsubishi Forklift Trucks 2013. All
© Mitsubishi Forklift Trucks 2013. All
CODE
CODE
19
19
28
28
rights reserved.
rights
reserved.
Revision: B
Revision: B
PBV20N2
PBV20N2
TRUCKTOOL
TRUCKTOOL
AND
AND
DISPLAY
DISPLAY
Over or under voltage detected
Over or under voltage detected
LOGIC FAILURE #1
LOGIC FAILURE #1
This alarm is displayed when the controller detects an
This alarm is displayed when the controller detects an overvoltage or undervoltage condition.
The overvoltage threshold is 35 V and the undervoltage threshold is 9.5 V in the 24V controller.
The overvoltage threshold is 35 V and the undervoltage threshold is 9.5 V in the 24V controller.
If the alarm is displayed at startup or in the standby mode, it is due to an undervoltage. In such
If the alarm is displayed at startup or in the standby mode, it is due to an undervoltage. In such
a case, check the following:
a case, check the following:
The key input signal voltage drops below th
The key input signal voltage drops below the undervoltage threshold due external loads,
•
•
such as DC/DC converters starting up or relays or contactors energizing or de-energizing.
such as DC/DC converters starting up or relays or contactors energizing or de-energizing.
If no voltage transient is detected on the supply line and the
If no voltage transient is detected on
•
•
the key is switched ON, the problem is in
the key is switched ON, the problem is in the COMBIACX controller.
If fault is displayed during motor driving, it is due to an undervoltage or an overvoltage
If fault is displayed during motor driving, it is due to an undervoltage or an overvoltage
condition.
condition.
If the alarm occurs during traction acceleration or driving hydraulic functions, it is caused by
If the alarm occurs during traction acceleration or driving hydraulic functions, it
•
•
an undervoltage condition. In such a case, check the
an undervoltage condition. In such a case, check the battery charge level and the power
cable connections.
cable connections.
If the alarm occurs during release braking, it
If the alarm occurs during release braking, it is caused by an overvoltage condition. In such
•
•
a case, check the line contactor tips and the battery power cable connections.
a case, check the line contactor tips and the
In some cases, this error can also happen during
In some cases, this error can also happen during normal operation. Sharp hits may cause the
emergency stop switch contacts to open for a short period of time. This causes a short 0
emergency stop switch contacts to open for a short period
pulse to the key line causing this error.
pulse to the key line causing this error.
Pump motor output voltage error (low)
Pump motor output voltage error (low)
PUMP VMN LOW
PUMP VMN LOW
Cause 1: Startup test
Cause 1: Startup test
Before switching the main contactor on, the software checks the power bridge. It turns on the
Before switching the main contactor on, the software checks the power bridge.
high side power mosfets one by one
high side power mosfets one by one and expects the phase voltage to
capacitor value. If the phase voltage does
capacitor value. If the phase voltage does not increase, this alarm occurs.
In such a case (the main contactor does not close at all), check the following:
In such a case (the main contactor does not
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 problem is in the COMBIACX controller.
If the motor connections are OK, the
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 commanded value, this alarm occurs.
the motor voltage feedback is lower than
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 truck frame
Whether the motor's phase windings or cables have leakages towards the
•
•
That the main contactor closes properly, with a good contact
That the main contactor closes properly, with a
•
•
If no faults are
If no faults are found, the problem is in
found, the problem is in the COMBIACX controller.
https://www.forkliftpdfmanuals.com/
Document ID: 615023
Document ID: 615023
DESCRIPTION
DESCRIPTION
(Alarm)
(Alarm)
overvoltage or undervoltage condition.
e undervoltage threshold due external loads,
the supply line and the alarm is displayed every time
the COMBIACX controller.
battery charge level and the power
is caused by an overvoltage condition. In such
battery power cable connections.
normal operation. Sharp hits may cause the
of time. This causes a short 0 V V
(Alarm)
(Alarm)
and expects the phase voltage to increase toward the rail
not increase, this alarm occurs.
close at all), check the following:
problem is in the COMBIACX controller.
the commanded value, this alarm occurs.
good contact
the COMBIACX controller.
155 (244)
155 (244)
Service Manual
Service
Manual
Stored
Stored
alarm is displayed every time
is caused by
Stored
Stored
It turns on the
increase toward the rail
truck frame
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