Zapi DUALAC2, Operating Handbook

Page: 78 / 85

Page 78
10. STEER SENSOR KO
This is an alarm which signals an out of range of the steering potentiometer signal. The
fault condition is entered in these two following conditions:
- the "Set steer 0 pos" (straight wheels programmation) parameter is wrong (lower
than "Set steer min" or higher than "Set steer max").
- the feedback signal of the steering potentiometer is outside the window defined by
"Set steer min" and "Set steer max" parameters.
In the first case, repeat the steering potentiometer acquisition. In the second case,
check the steering poti and its wiring. Eventually, repeat again the steering
potentiometer acquisition.
11. PEDAL WIRE KO
This alarm is signalled if a fault is detected in the accelerator unit wiring (NPOT or
PPOT cable is interrupted).
12. WRONG SET BATTERY
When the key is turned ON, the controller check the battery voltage and compares it
with the "SET BATTERY" parameter setting. If the actual value is 20% higher or lower
than nominal value, the fault condition is entered.
Replace the battery with a correct battery.
13. SLAVE KO
Slave and Master µCs perform a cross-check in order to verify their functionality. If the
MASTER detects SLAVE µC malfunctioning, it brings the controller in a safe status
opening the power bridge and the Line Contactor.
14. MASTER KO
Slave and Master µCs perform a cross-check in order to verify their functionality. There
are two conditions under which slave enters this fault condition:
- the SLAVE µC receives incoherent can message from the MASTER µC
- the SLAVE µC compares the inputs status and the related MASTER operations,
and find they are not coherent.
In both cases, the SLAVE brings the controller to a safe status opening the power
bridge and the Line contactor.
15. INPUT MISMATCH
Safety related inputs (Fw direction, Rev direction, accelerator ENABLE, SEAT switch)
are input to both microcontrollers by independent hw circuit. The two µCs read these
inputs and compare by exchanging related status on the canbus. If the SLAVE µC finds
a mismatch between its inputs and MASTER inputs, it brings the controller to a safe
status opening the power bridge and the Line contactor.
16. AUX OUTPUT KO
The µP checks the driver of the electromechanical brake coil. If the status of the driver
output does not correspond to the signal coming from the µP, the alarm is signalled. It
is suggested to preliminary check if there is an external short or low impedance pull-
down between NAUX (C31) and -BATT. If no external cause can be found, replace the
logic card.