Zapi COMBIACX, Руководство пользователя

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Analysis and troubleshooting of microcontroller alarms
To Enter the MAIN MENU’ push the Enter button at the Home Page of the hand set
display and Roll for the ALARMS item. Here is the ALARMS list:
1) “CAPACITOR
CHARGE”
Follows the charging capacitor system:
When the key is switched ON, the inverter tries to charge the power capacitors
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.
Troubleshooting:
A) There is an external load in parallel to capacitor bank, which sinks current
from the controller capacitors precharging circuit, thus preventing the caps
from charging. Check if a lamp or a dc/dc converter or a auxiliary load is
placed in // to capacitor bank.
B) The charging resistance is opened; insert a power resistance across line
contactor power terminals; if the alarm disappears, it means the controller
internal charging resistance is damaged.
C) The charging circuit has a failure, inside the controller.
D) There is a problem in the controller power section.
2) “VMN
LOW”
Cause 1: start-up test.
Before switching the LC on, the software checks the power bridge: it turns on
alternating the High side Power Mosfets and expects the phases voltage to
increase toward the rail capacitor value. If the phases voltage does not
increase, this alarm occurs.
Cause 2:
Motor running test. When the motor is running, power bridge is ON, the motor
voltage feedback is tested; if it is lower than commanded value, fault status is
entered.
Troubleshooting:
A) If the problem occurs at start up (the LC does not close at all), check:
- Motor internal connections (ohmic continuity)
- Motor power cables connections
- Motor leakage to truck frame
- If the motor connections are OK, the problem is inside the controller
B) If the alarm occurs during motor running, check:
- Motor connections
- If motor phases windings/cables have leakages towards truck frame
- That the LC power contact closer properly, with a good contact