Zapi COMBI AC0, Руководство пользователя

Страница: 73 / 79

AF6ZP0AL - COMBIAC0 & ACE0 - User Manual Page - 73/79
The SW continuously checks for the connection of the two supply ends of the
potentiometer in the accelerator. The test consists of reading the voltage
drop on a sense diode, connected between NPOT (CNA#30) and GND and
cascaded with the potentiometer: if the potentiometer gets disconnected on
PPOT (CNA#25) or NPOT, no current flows in this sense diode and the
voltage on the NPOT connection collapses down.
When the NPOT voltage is less than 0.3V this alarm occurs. This alarm
occurs also when the NPOT voltage is higher than 2Vdc (to detect also the
condition of a broken sense diode).
Troubleshooting:
Check the voltage on NPOT and the potentiometer connections.
13) “TILLER OPEN”
Cause:
Warning: when the tiller is released, after a fixed period of time of standby
(30 seconds) the main contactor open.
Troubleshooting:
At the next travel request the warning disappear.
14) “CURRENT GAIN”
Cause:
The Maximum current gain parameters are at the default values, which
means the maximum current adjustment procedure has not been carried out
yet.
Troubleshooting:
Ask the assistance of a Zapi technician to do the correct adjustment
procedure of the current gain parameters.
15) “WAITING FOR NODE”
Cause:
The controller receives from the CAN the message that another controller in
the net is in fault condition; as a consequence the ACE0/ COMBIAC0
controller itself cannot enter an operative status, but has to WAIT for the
other controller coming out from the fault status.
16) “DEAD MAN ABSENT”
Cause:
This warning (presents only in trucks with “Dead Man” switch) appears when
the “Dead Man” switch is open.
Troubleshooting:
At the next travel request with dead man switch close the warning
disappears.
17) “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.
18) “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.