MAINTENANCE
OPERATOR MANUAL
64
EPS14P
65
OM-EPS14P2019001-EN
Display ALARM Fault name Recommended inspection
02A28 PUMP VMN LOW Oil pump VMN low
Possible cause: When the motor is turned on, the low-end voltage of
MOS tube is higher than 10% the normal battery voltage, or the phase
voltage is higher than 50% the battery voltage.
Possible causes:
1.Incorrect phase connection or faulty circuit of the motor. Check the
motor for incorrect phase connection. Check the motor for current
leakage to the ground. Check the motor for broken coil.
2.Replace the controller.
02A29 PUMP VMN
HIGH
Oil pump VMN high
Possible cause: When the motor is turned on, the low-end voltage of
MOS tube is higher than 10% the normal battery voltage, or the phase
voltage is higher than 50% the battery voltage.
Possible causes:
1.Incorrect phase connection or faulty circuit of the motor. Check the
motor for incorrect phase connection. Check the motor for current
leakage to the ground. Check the motor for broken coil.
2.Replace the controller
02A30 vmn low 3 phase wire fault Check the 3 phase wire of motor
02A31 vmn high VMN high
Possible cause: When the motor is turned on, the low-end voltage
of MOS tube is higher than 10% the normal battery voltage, or the
phase voltage is higher than 50% the battery voltage. Possible causes:
1. Incorrect phase connection or faulty circuit of the motor. Check the
motor for incorrect phase connection. Check the motor for current
leakage to the ground. Check the motor for broken coil. 2. Replace the
controller.
02A32 PUMP VMN NOT
OK
02A37 contactor closed Main contactor get
stuck
Check whether the main contactor get stuck
02A38 contactor open Main contactor open 1. Broken circuit of main contactor coil. 2. Main contactor damaged
02A40 AUX DRIV.SHRT. Short circuit of
auxiliary drive
Short circuit of drive circuit of electromagnetic brake or auxiliary
electric brake.Check for short circuit or low-impedance push-pull
output between A16 and –BATT. Fault with drive circuit of logic card.
Replace the controller.
02A41 WRONG
BATTERY
Fault with battery
setting
While the forklift is being started, the controller checks whether battery
voltage is within the nominal voltage range.
1. Check whether the “BATTERY VOLTAGE” setting in the “TESTER”
agrees with the indication of the voltmeter. In the case of disagreement,
change battery voltage setting to be the same as the measured value,
by using the “ADJUST BATTERY) function. 2. Replace the battery.
02A42 AUX DRIV.OPEN NFault with drive of
auxiliary output)
Drive circuit of auxiliary coil is unable to drive the load. Device itself or
drive coil is damaged. Replace the controller.
02A47 EVP2 NOT OK NAUX2 input voltage
is outside the range
Check whether NAUX2 input voltage is within the range. If not, re-
calibrate the maximum and minimum of NAUX2, and turn the key
switch to “ON” again. This fault will disappear.;
02A48 EVP1 NOT OK NAUX1 input voltage
is outside the range/
(CAD fault table: Open
circuit of proportional
valve drive circuit)
Check whether NAUX1 input voltage is within the range. If not, re-
calibrate the maximum and minimum of NAUX1, and turn the key
switch to “ON” again. This fault will disappear.
02A49 LIFT + LOWER Faults with lifting and
lowering exist at the
same time
1. Improper operation; 2. Self fault of lift and lowering switch; 3.
Replace the controller;
i=0 ever Drive current cannot
be stopped
If the connection of motor 3 phase wire has no problem, please replace
the controller
02A50 EVP1 COIL OPEN Open circuit of
NAUX1 coil
Check NAUX1 coil for open circuit, and whether EVP1 type setting is
correct.
02A51 EVP2 COIL OPEN
Open circuit of NAUX2
coil
Check NAUX2 coil for open circuit, and whether EVP2 type setting is correct.
TILLER OPEN
Tiller input switch is
disconnected
With the triller input switch disconnected, after a period approximately 30s
has elapsed, the main contactor will disengage and the warning will occur.
The warning will not occur next time the forklift is operated.
Display ALARM Fault name Recommended inspection
02A52 PUMP I=0 EVER Oil pump I=0 fault
Check whether the power supply line of the oil pump
motor is in good condition. If the line is in good condition,
replace the controller;
02A53
STBY I HIGH Standby current is high
The micro controller system has detected that the signal
of the current sensor is outside the permissible range of
current with the forklift in the idling state. This fault is
irrelevant to external components. Replace the controller.
WRONG ZERO Error of zero voltage
While the forklift is being started, feedback value of high
end voltage of VMN is not in the order of 2.5V. Circuit of the
controller is damagedFault analysis: The following checks are
recommended.Check internal connection of the motorCheck
power cable connection of the motor.Check for drain current
between the motor and the forklift housing.If the motor
connection is in good condition, the fault is in the controller
interior. Replace the controller.
02A54 LOGIC FAILURE #1 Logic card fault #1
Faults caused by under-voltage or over-voltage protection.
In 24V system, the controller detects a voltage above 45V
or below 9V; In 48V system, the controller detects a voltage
above 65V or below 11V.
Possible causes: 1. Whether there is short circuit in the
circuit system, such as DC-DC, brake coil, etc., or whether
the controller input power supply is in good contact.
2.Whether the battery voltage is over low or over high.
3.Check if the power cable above the terminals such as B+,
B, main contactor is tight.
4.Whether the calibration parameter of controller voltage is
consistent with the actual voltage.
5.Fault with the hardware circuit protected by over-voltage
on the logic card. Replace the controller.
02A55 LOGIC FAILURE #2 Logic card fault #2 Fault with the phase voltage feedback hardware circuit in
the logic card. Replace the controller.
02A56 PUMP I NO ZERO Current exceeds limit while
pump motor does not run
Replace the controller;
02A60 CAPACITOR CHARGE Capacitor charging error
With the key switch turned to “ON”, the controller will
charge the capacitor via the power resistor. The controller
will detect whether the capacitor is fully charged within the
specified time. If the capacitor is not fully charged within
the specified time, and the capacitor voltage is still less
than 20% the battery voltage, the controller will display the
warning and the main contactor will not engage.
02A61 THERMIC SENS. KO Temperature sensor fault
Controller temperature sensor output signal is outside the
range. This fault is not related to external components.
Replace the controller.
high temperature Controller overheating Measure the temperature of controller base plate.
02A62
TH.PROTECTION Controller over-temperature
protection
Lower the controller temperature to below 85oC. If the fault
still exists, possibly the temperature sensor or controller
becomes faulty. Replace the controller.
02A64 TILLER ERROR Interlock mismatches H&S
input
Replace the controller;
02A65 MOTOR TEMPERAT. Motor temperature high
1. If the motor temperature digital switch is turned on, or
analogue signal exceeds the cutout value, then the fault
results. 2. When motor temperature rises to 120 ° C, the
controller will display the warning. The forklift still can
travel but the maximum current is reduced with the forklift
performance degraded. When the motor temperature
reaches 125 ° C, the motor stops working. In this case,
action shall be taken to cool the motor. 3. The fault still
exists when the motor cools, check the line. If all have no
faults, replace the controller.
02A67
SENS MOT TEMP KO Temperature sensor fault
Symptom: Output signal of motor temperature sensor is
outside the permissible range. Solution: Check the signal
value and connection of the sensor. If they are normal, the
fault occurred in the controller.
NO CAN MSG. No CAN signal Fault with CAN communication between steering and
towing. Check CAN connection, as well as version and
configuration of software.
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