Servo Motor Alarm Code No. 21 on Samsung Techwin SM321 SMT Machine

Alarm Contents: Motor encoder Communication check alarm.

Operating Condition: After the control power is turned on.

Causes: Motor encoder communication parts failure.
Measures:
Servo-Amp. change.
Servo-motor change.

Causes: Motor encoder cable connection error or failure.
Measures: Motor encoder cable check and change.