Zapi ACEX, Руководство пользователя

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AFCZP0BC – COMBIACX & ACEX - User Manual Page - 69/81
This fault is displayed when the controller detects a low logic level of Key-Off
signal during Start-Up diagnosis.
Troubleshooting:
It is very likely the fault is due to an under voltage, so it is suggested to check:
A) Key input signal down-going pulses (below under voltage threshold) due to
external loads, like DC/DC converters starting-up, relays or contactor
switching, solenoids energizing / de-energizing.
B) Check the connection of power cables to the battery terminal, positive and
negative, to MC and to contBatt and –Batt, which must be screwed
with a torque comprised in the range 5,6Nm÷8,4Nm.
C) If no voltage transient is detected on the supply line and the alarm is present
every time the key is switched ON, the failure is probably in the controller
hardware, so it is necessary to replace the logic board.
24) “EVP DRIV. SHORT.”
Cause:
A) The EVP driver is shorted.
B) The microcontroller detects a mismatch between the valve set-point and the
diver voltage measured on the LOWER EVP output.
Troubleshooting:
Check if there is a short or a low impedance between the negative of the coil
and -BATT. Otherwise the driver circuit is damaged and the controller must be
replaced.
25) “PUMP VMN LOW”
Cause:
The pump motor output is lower than expected, considering the pwm applied.
Troubleshooting:
A) If the problem occurs at start up (the LC does not close at all), check:
- Motor internal connections (ohmic continuity)
- Motor power cables connections
- If the motor connection are OK, the problem is inside the controller
B) If the problem occurs after closing the LC (the LC closed and then opens
back again), check:
- Motor
connections
- If motor windings/cables have leakages towards truck frame
- If no problem are found on the motors, the problem is inside the
controller
C) If the alarm occurs during motor running, check:
- Motor connections
- If motor windings/cables have leakages towards truck frame
- That the LC power contact closer properly, with a good contact
- If no problem are found on the motors, the problem is inside the
controller.
26) “PUMP VMN HIGH”
Cause:
This test is carried out when the pump motor is turning (pwm applied). The
pump motor output is higher than expected, considering the pwm applied.
Troubleshooting:
It is suggested to check:
A) Motor connections
B) If motor windings/cables have leakages towards truck frame
C) If no problem are found on the motors, the problem is inside the controller