Delta AL057 fault code meaning
Delta / AL057
Series: ASDA-A3, ASDA-H3
Feedback pulse loss
servo drive
Meaning: When P2.081 = 1, the drive checks for lost pulses. This alarm is triggered when the number of lost pulses exceeds the value of P2.082.
Possible causes
- Condition: When P2.081 = 1, the drive checks for lost pulses. This alarm is triggered when the number of lost pulses exceeds the value of P2.082. Cause:
- Pulses are lost during motor operation.
- The pulse signal is affected by noise interference.
Source: ASDA-A3 User Manual (DELTA_IA-ASD_ASDA-A3_UM_SC_20230515) P1164; ASDA-H3 User Manual (DELTA_IA-ASD_ASDA-H3_UM_SC_20260428) P783
Series: ASDA-W3
CN5 Pulse encoder feedback pulse loss
servo drive
Meaning: When the motor uses a pulse encoder and PM.003.U = 1 and P2.081 = 1, the drive checks for lost pulses. This alarm is triggered when the number of lost pulses exceeds the value of P2.082.
Possible causes
- Condition: When the motor uses a pulse encoder and PM.003.U = 1 and P2.081 = 1, the drive checks for lost pulses. This alarm is triggered when the number of lost pulses exceeds the value of P2.082. Cause:
- Pulses are lost during motor operation.
- The A, B, and Z phase pulse signals are affected by noise interference.
- Poor contact in the encoder wiring.
- The optical scale or read head is dirty or scratched.
- The motor moves too fast, causing the encoder pulse frequency to exceed the drive's CN5 limit.
- The P1.074.U setting is inappropriate.
Source: ASDA-W3 Series Servo System Application Technical Manual (DELTA_IA-ASD_ASDA-W3_UM_SC_20251226) P740