Zapi ZAPIMOS Series, Manual

Page: 58 / 66

Page 58
11. VMN LOW, VMN HIGH
The test is carried out during initial diagnosis and in standby.
Possible causes:
a. problem with the motor connections or the motor power circuit; check if the 3 phases
are correctly connected; check if there's a dispersion of the motor towards ground;
b. inverter failure, replace it.
12. VACC NOT OK
The test is made in standby. This alarm indicates that the accelerator voltage is 1V
greater than the minimum value programmed by the PROGRAM VACC function.
Possible causes:
a. the potentiometer is not correctly calibrated;
b. the potentiometer is defective.
13. PEDAL WIRE KO
This alarm is signalled if a fault is detected in the accelerator unit wiring (NPOT or
PPOT cable is interrupted).
14. STBY I HIGH
Test carried out in standby. Check if the current is 0. If not verified, an alarm is signalled
which inhibits machine operations. Possible causes:
a. current sensor failure;
b. logic failure: first replace the logic; if the defect persists, replace the power unit.
15. MAIN CONTACTOR ALARMS
COIL SHORTED:
When the key is switched ON the µP checks the MC driver FF SR. If it does not react in
a correct way to the µP stimulus, the alarm is signalled. Replace the logic board. The
FF SR makes an hardware control of the current in the MC coil. If this is too high, it
opens the MC and the alarm is signalled.
Check if there are external shortcircuit and if the ohmic value of the MC is correct;
otherwise replace the logic.
DRIVER SHORTED:
When the key is switched ON, the µP checks that the MC coil driver is not shorted; if it
is, this alarm is signalled; replace the logic board.
CONTACTOR DRIVER:
When the initial diagnosis is finished, the traction logic closes the MC and checks the
voltage on the Drain of the driver. If this is not low , an alarm is signalled.
Replace the logic.
CONTACTOR OPEN:
The main contactor coil has been driven by the logic board, but the contactor does not
close. Two possible reasons:
a) the wires to the coil are interrupted or not well connected.
b) the contact of the contactor is not properly working.