7.3. ALARMS AND SIGNALS
The indications that follow are an aid for identifying and possibly eliminating the causes of
machine faults or problems. Remember, however, that the electric and electronic equipment
can only be repaired by qualified and authorised technicians. Repairs carried out incorrectly
can create risks to user safety and undermine good machine operation.
Causes, checks and possible solutions
Conveyor encoder
malfunction
The PLC is not receiving any count from the encoder.
Check encoder operation.
Make sure the connection between the PLC and the drive, or between the PLC and the
inverter, is correct.
A mechanical block has occurred.
The drive is faulty.
Make sure all the mechanical components can move freely.
Check drive and motor operation.
The final position was not reached within the established lapse of time.
Make sure all the mechanical components can move freely.
Check drive and motor operation.
The belt conveyor has stopped beyond the preset position.