E20-001
Fault Causes:
1. Brake not released;
2. Encoder disconnected;
3. Problem with the inverter to motor power line circuit.
E20-003
Fault Causes:
1. Change inverter output phase sequence;
2. Brake not released, check brake circuit and brake wiring;
3. Fault reported when changing phase sequence after the main unit has started rotating, change inverter output phase sequence;
4. Loose connection in power line, causing excessive current during phase commutation.
5. Motor parameter F1-05 setting error
6. Encoder problem Note: Possible causes for this fault during load tuning include brake not being released, incorrect motor or encoder parameter settings, poor encoder signal, unstable power supply, etc.
E20-004
Fault Causes:
1. Z signal not connected
2. Encoder interference Note: If the Z signal is confirmed to be connected, it is recommended to ground the system.
E20-005
Fault Causes:
1. Encoder not connected
2. Encoder circuit hardware damage Note: During operation, encoder CD disconnection does not report a fault, only after shutdown.
E20-007
Fault Causes:
1. Encoder not connected
2. Encoder UVW signal abnormal Note: During operation, encoder UVW signal disconnection does not report a fault, only after shutdown.
E20-009
Fault Causes:
1. Excessive current loop (including zero servo).
2. Encoder interference (especially in cases of occasional fault reports). 3. Encoder phase sequence and inverter output phase sequence reversed. 4. Incorrect motor or encoder parameter settings.
5. Output phase loss (safety, door lock loose connection).
6. Low-power main unit has angle-free self-learning enabled, reporting a fault after power-off and power-on.
7. Mechanical jamming causing large deviation in starting torque, including brake (holding brake) not disengaged.
8. For non-mechanical reasons, redo the main unit self-learning, check the learned values of F2-06/07, and modify F2-11/12/13 based on the learned parameters of F2-06/07 (for low-power main units). If the speed loop or current loop is inappropriate, F2-11 can generally be set to F2-06, the motor tuning value divided by 10.
9. Confirm whether the encoder plug is loose and ensure grounding.
10. Mechanical jamming or high resistance causing large deviation in starting torque.
11. Disabling zero servo and setting F8-01 to 0 resolves the fault, indicating a zero servo issue; reduce the zero servo speed loop parameters. 12. Encoder interference can easily cause occasional fault reports during zero servo operation; grounding and interference shielding are recommended.
13. If the fault is reported occasionally, add an amorphous magnetic ring for testing.
14. For small-diameter mainframes, set F1-24bit12 to 1 (or F1-24=4096) to amplify the judgment threshold. Note: On-site, setting F1-24BIT9 = 1 (or F1-24=512) to disable optimized runaway faults can help determine if it's a false alarm.
E20-012
Fault Causes:
1. Brake not released;
2. Encoder AB signal disconnected;
3. Running contactor not closed.
E20-013
Fault Causes:
1. Encoder disconnected during operation;
2. Interference causing abnormal speed;
3. Brake locked during operation;
4. For low-power systems, reduce F2-00/03 parameters.
E20-014
Fault Causes:
1. Encoder not connected to Z signal;
2. Z signal interference.
E20-019
Fault Causes:
1. Encoder disconnected wire;
2. AB signal interference in sine/cosine encoder.
E20-055
Fault Causes:
1. Z signal interference;
2. Encoder CD signal reversed.
Note: This fault cannot be masked. If the encoder wiring sequence is correct, it is generally caused by interference.
