Zapi COMBI AC1 User Manual

11.7 Analysis and troubleshooting of Slave alarms
1) “EVP DRIVER SHORTED”
Cause:
The EVP driver is shorted.
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.
2) “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.
3) “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
4) “ANALOG INPUT”
Cause:
This alarm occurs when the A/D conversion of the analog inputs gives frozen
value, on all of the converted signals, for more than 400msec. The goal of
this diagnosis is to detect a failure of the A/D converter or a problem in the
code flow that omits the refreshing of the analog signal conversion.
Troubleshooting:
If the problem occurs permanently it is necessary to substitute the controller.
5) “LOGIC FAILURE #1”
Cause:
This fault is displayed when the controller detects an overvoltage or
AEQZP0BA – COMBI AC1 - User Manual Page - 77/86

Zapi COMBI AC1 Specifications

General

Brand	Zapi
Model	COMBI AC1
Category	Inverter
Language	English