Zapi AC-2 User Manual download pdf (Page 72)

Page - 72/83 AF2ZP0CE - ACE2 350/450 - User Manual

Cause:

When the key is switched ON, the inverter tries to charge the power

capacitors through a series of a PTC and a power resistance, and check if

the capacitor are charged within a timeout. If the capacitor voltage measured

is less than 20% of the nominal battery voltage, an alarm is signalled; the

main contactor is not closed.

Troubleshooting:

- There is an external load in parallel to capacitor bank, which sinks

current from the controller capacitors pre-charging circuit, thus

preventing the caps from charging. Check if a lamp or a dc/dc converter

or an auxiliary load is placed in parallel to capacitor bank.

- The charging resistance or PTC is opened; insert a power resistance

across line contactor power terminals; if the alarm disappears, it means

the controller internal charging resistance is damaged.

- The charging circuit has a failure, inside the controller.

- There is a problem in the controller power section.

5) COIL SHORT HW KO

Cause:

The hardware circuits which manages short circuits protection of LC and

EB/AUX coils has a problem.

Troubleshooting:

This type of fault is not related to external components; replace the ACE logic

board.

6) DRIVER SHORTED

Cause:

The driver of the main contactor coil is shorted.

Troubleshooting:

- Check if there is a short or a low impedance pull-down between NMC

(CNA#16) and –BATT.

- The driver circuit is damaged in the logic board, which has to be

replaced.

7) AUX DRIVER SHORTED

Cause:

The driver of the electro mechanic brake/ auxiliary electro valve coil is

shorted.

Troubleshooting:

- Check if there is a short or a low impedance pull-down between

NEB/NAUX (CNA#18) and –BATT.

- The driver circuit is damaged in the logic board, which has to be

replaced.

8) SAFETY IN

Cause:

The safety input is opened and accordingly the MC is opened an EB/AUX

OUT coil is driven.

Troubleshooting:

Check the CAN#11 input, if it is connected to –Batt and the alarm is

generated then there is a fault in the SAFETY IN hardware circuit. Replace

the logic board.

9) SAFETY OUT

Cause:

The safety out driver is shorted.

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Zapi AC-2 User Manual Page 72

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