SME AC-M1, Manual

Page: 39 / 62

Maximum battery voltage:
●
Alarm code: 1
●
Alarm level: 1
●
Alarm cause: too high an inverter voltage.
If the controller detects such a fault, follow these tips:
1. Such an alarm can be caused by the presence of braking currents; when the
vehicle is on release or reverse braking ramp, motors work as generators, and
battery voltage could exceed over-voltage limit.
In a case like that, the battery condition should be verified (if the battery is new it is
necessary to do some charge-discharge cycles before reaching the rating declared
by the constructor) or has a high internal resistance due to an element failure.
If the case is the second and it is not possible to change the battery, the solution
may be to reduce the release and reverse braking ramp (see paragraph “Drive
motor” on the EyePlus manual).
2. Verify if the battery is still in good conditions.
3. Check if the wiring to the battery positive or negative terminals and the coil
connections are correct.
4. If this alarm is present when the battery voltage is in the correct range, replace the
control board .
Minimum battery voltage:
●
Alarm code : 2
●
Alarm level : 1
●
Alarm cause : too low a battery voltage.
In case of minimum battery voltage alarm, follow these tips:
1. Check if the wiring to the battery is incorrect or if the positive or negative terminals
are corroded;
2. Verify the battery conditions: if the electrolyte inside is partially exhausted, an under
voltage alarm can sometimes be detected from the controller; in case of low battery
charge (<10%), high current rates (i.e. if the motor is working in full load conditions)
could cause an under voltage alarm, in particular in presence of an exhausted
battery.
3. If this alarm is present when the battery voltage is in the correct range, replace the
control board.
PRELIMINARY VERSION 39