Page - 76/85 AF2ZP0CL - ACE2 - User Manual
and negative, to MC and to controller +Batt and –Batt, which must be
screwed with a torque comprised in the range 13Nm÷15Nm.
- If no voltage transient is detected on the supply line and the alarm is
present every time the key is switched ON, the failure is probably in the
controller hardware, so it is necessary to replace the logic board.
Troubleshooting of fault displayed during motor driving; in this case it can
be an under voltage or an over voltage condition.
- If the alarm happens during traction acceleration or driving hydraulic
functions, it is very likely it is an under voltage condition; check battery
charge condition, power cable connection.
- If the alarm happens during release braking, it is very likely it is due to
over voltage condition; check line contactor contact, battery power cable
connection.
14) LOGIC FAILURE #3
Cause:
Hardware problem in the logic card circuit for high current (overload)
protection.
Troubleshooting:
This type of fault is not related to external components, so, when it is present
it is necessary to replace the ACE logic board.
15) POWER MOS SHORTED
Cause:
Before switching the MC on, the software checks the power bridge: it turns
on alternatingly the Low side and High side Power Mosfets and expects the
phases voltage to decrease down to –BATT (increase up to +Batt). If the
phases voltage do not follow the commands, this alarm occurs.
Troubleshooting:
This type of fault is not related to external components; replace the controller.
16) VMN HIGH
Cause 1:
Before switching the LC on, the software checks the power bridge: it turns on
alternatingly the Low side Power Mosfets and expects the phases voltage to
decrease down to -BATT. If the phases voltage is higher than 10% of
nominal battery voltage, this alarm occurs.
Cause 2:
This alarm may occur also when the start up diagnosis is overcome, and so
the LC is closed. In this condition, the phases’ voltages are expected to be
lower than 1/2 Vbatt. If it is higher than that value, 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
- If the motor connection are OK, the problem is inside the controller,
replace it.
- If the problem occurs after closing the LC (the LC closed and then opens
back again), check:
- Motor connections
- If motor phases windings/cables have leakages towards truck frame
- If no problem are found on the motors, the problem is inside the
controller, replace it.
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