8145

Category: Alarm

Cause

Condition: When P2.081 = 1, the drive checks for missing pulses. This alarm occurs if the missing pulse count exceeds P2.082. Causes:

1. Pulses are lost during motor operation.
2. The pulse signal is affected by noise.

Corrective action

1. Check whether noise interference causes missing pulses in the motor encoder feedback.
2. If an interference source exists, check as follows: (a) Verify that the motor grounding terminal is properly grounded; connect the power cable grounding conductor (yellow-green) to the drive heatsink (Heat Sink). (b) Use shielded feedback signal cable. Separate signal cables from power cables and high-current wiring to prevent interference.
3. If the encoder feedback is a square-wave digital signal, check whether excessive motor speed exceeds the hardware maximum reception limit of 20 MHz (after 4-fold multiplication).
4. In addition to eliminating noise sources, appropriate filtering can remove noise when the encoder uses square-wave digital signals. When the main encoder signal comes from CN2 (PM.003.U = 0), configure PM.003.Z; when it comes from CN5 (PM.003.U = 1), configure P1.074.U.
5. Use P1.055 to limit the maximum motor speed.
6. Check that P2.083 is set correctly. Power on again to clear.