Zapi COMBI AC1 User Manual

11.9 Analysis and troubleshooting of Slave warnings
1) “CURRENT SENSOR LOW”
Cause:
The pump chopper current sensor feedback is too low (below 0.5V).
Troubleshooting:
This type of fault is not related to external components; replace the controller.
2) “HW FAULT VALVE”
Cause:
The slave has detected that the master microcontroller is not able to stop
hydraulic valves functions
Troubleshooting:
This fault is not related to external components, so it is necessary to replace
the controller.
3) “VALVE COIL SHORTED”
Cause:
This alarm occurs when there is a short circuit on an on/off valve coil.
Troubleshooting:
A) If the fault is present at start up, it is very likely that the hw overcurrent
protection circuit is damaged, it is necessary to replace the controller.
B) If the fault is present when the controller drives the outputs, the problem
is located in the harness and in the coils.
4) “VALVE DRIVER SHORTED”
Cause:
One or more on/off valve drivers are shorted.
Troubleshooting:
Check if there is a short or a low impedence between the negative of one of
those coils and –BATT. Otherwise the driver circuit is damaged and the
controller must be replaced.
5) “VALVE CONT DRIVER”
Cause:
One or more on/off valve drivers is not able to drive the load (cannot close).
Troubleshooting:
The device or its driving circuit is damaged, replace the controller.
6) “EVP DRIVER KO”
Cause:
The EVP valve driver is not able to drive the load (cannot close).
Troubleshooting:
The device or its driving circuit is damaged, replace the controller.
7) “PUMP STBY I HIGH”
Cause:
In standby condition (pump motor not driven), the feedback coming from the
current sensor in the pump chopper gives a value too high (>0,8).
Troubleshooting:
This type of fault is not related to external components; replace the controller.
AEQZP0BA – COMBI AC1 - User Manual Page - 81/86

Zapi COMBI AC1 Specifications

General

Brand	Zapi
Model	COMBI AC1
Category	Inverter
Language	English