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AE0ZP0EC - AC-0 SSL SENSORED - User Manual
or NPOT, no current flow in this sense diode and the voltage on
the NPOT connection collapses down.
When the NPOT voltage is less than 0.3 V this alarm occurs.
This alarm occurs also when the NPOT voltage is higher than 2
Vdc (to detect also the condition of a broken sense diode).
- Remedy:
Check the voltage on NPOT (CNB#11) and the potentiometer
connections.
12.1.5 Five Blinks Alarms
1) ENCODER
ERROR
MDI-PRC Code = 70
- Cause:
Two consecutive readings of the encoder speed are too much
different in between: because of the inertiality of the system it is
not possible the encoder changes its speed a lot in a short
period. Probably an encoder failure has occurred (e.g. one or
two channels of the encoder are corrupted or disconnected).
- Remedy:
Check both the electric and the mechanical encoder
functionality. Frequently we experienced one of the two Sensor
bearing’s ring, slips inside its seat raising this alarm condition.
Also the electromagnetic noise on the sensor bearing can be a
cause for the alarm.
2) STBY I HIGH
MDI-PRC Code = 53
- Cause:
This diagnosis is executed only when the main contactor is
opened and asked to be closed (e.g. at key on or when the
main contactor is opened and a new motion request turns
active). Then the outputs of the Current amplifiers must be in a
narrow window close to 2.5 Vdc (from 2.26 V to 2.74 V).
Otherwise this STBY I HIGH alarm occurs.
- Remedy:
If the alarm occurs permanently, it is necessary to replace the
controller.
3) I=0
EVER
MDI-PRC Code = 49
- Cause:
This test is carried out when the motor is running, and it verifies
that the current feedback sensor is not constantly stuck to 0.
- Remedy:
If everything is ok for what it concerns the motor, the problem
could be in the current sensor or in the related circuit.
12.1.6 Six Blinks Alarms
1) COIL
SHORTED
MDI-PRC Code = 76
- Cause:
This alarm occurs when there is an overload on one of the
following connections: CNA#1, CNA#3, CNA#4 and CNA#6.
Typically the problem is due to a short circuit of one of the coils
connected to these outputs. After the overload has removed,
the alarm exits automatically by releasing and then enabling a
travel demand.
- Remedy:
Check the coils of the main contactor (CNA#1) and of the first
(CNA#3), the second (CNA#4) and the third (CNA#6) auxiliary
outputs.