User manual

Page - 82/89 AE9ZP0BD - DUALAC2/&HP/POWER - User Manual
7) CAPACITOR CHARGE
Follows the charging capacitor system:
When the key is switched ON, the inverter tries to charge the capacitor
through a power resistance, and check if the capacitor are charged within a
timeout. If they do not charge, an alarm is signalled; the main contactor is not
closed.
Possible reasons:
A) the charging resistance is opened.
B) The charging circuit has a failure.
C) There is a problem in the power section.
8) MAIN CONTACTOR ALARMS
COIL SHORTED:
When the key is switched ON the µController checks the LC coil driver
shortcircuit protection hardware. If it does not react in a correct way to the µC
stimulus, the alarm is signalled. Replace the logic board. When the fault
occurs while the LC is closed, the alarm signals a shortcircuit across LC coil.
Check if there are external shortcircuit and if the ohmic value of the MC coil is
correct; otherwise replace the logic.
DRIVER SHORTED:
When the key is switched ON, the µC checks that the LC coil driver is not
shorted; if it is, this alarm is signalled. Preliminary, check if there is an
external short or low impedance pull-down between NLC (C26) and -BATT. If
no external causes can be found out, replace the controller.
CONTACTOR DRIVER:
When the initial diagnosis is finished, the traction logic closes the LC and
checks the voltage on the Drain of the driver. If this is not low , the driver is
not able to close 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 (does not pull-in).
CONTACTOR CLOSED:
Before driving the LC coil, the controller checks if the LC contact is stuck.
The controller drives the bridge for a while, trying to discharge the capacitor
bank. If they don't discharge, the fault condition is entered. It is suggested to
check the contactor contact, if it is mechanically stuck.
9) ENCODER ERROR
This alarm is signalled in following condition: the frequency supplied to the
motor is higher than 20 Hz, and the signal feedback from the encoder has a
jump higher than 20 Hz in few tens millisecond. This condition clearly shows
a malfunctioning of the encoder signal. It is suggested to preliminary check
the encoder wiring; if no fault is found in the wiring it is necessary to replace
the encoder.
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: