Zapi ACE2 - Page 77

AF2ZP0CL - ACE2 - User Manual Page - 77/85
17) VMN LOW
Cause 1:
Start-up test. Before switching the LC on, the software checks the power
bridge: it turns on alternatingly the High side Power Mosfets and expects the
phases voltage to increase toward the rail capacitor value. If the phases
voltage is less than 66% of the rail capacitor voltage, 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 (a window of
values are considered) fault status is entered.
Troubleshooting:
- 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,
replace it.
- 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
- If no problem are found on the motors, the problem is inside the
controller, replace it.
18) STBY I HIGH
Cause:
The current transducer or the current feedback circuit is damaged in the
controller.
Troubleshooting:
This type of fault is not related to external components so, when it is present,
it is necessary to replace the controller.
19) WRONG 0 VOLTAGE
Cause:
At start-up the high resolution VMN feedback is not comprised in a permitted
window of values centred around 2,5V. The circuit is damaged in the
controller.
Troubleshooting:
It is suggested to 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,
replace the logic board
20) CONTACTOR CLOSED
Cause:
Before driving the MC coil, the controller checks if the contactor is stuck. The
controller drives the bridge for some tens milliseconds, trying to discharge the
capacitors bank. If the capacitor voltage does decrease by 20% of the key
voltage the alarm is generated.
Troubleshooting:
It is suggested to verify the power contacts of LC; to replace the LC is
necessary.