Background / Cause:

Abnormal three-phase power output of the controller. Caused by internal drive circuit damage, motor short circuit or wiring short circuit.

Solutions:

1.Power off the device immediately and check all motor connecting wires.

2.Check for short circuit, open circuit and line leakage of motor lines.

3.Remove motor wiring and power on to test if the fault disappears.

4.If fault still exists after disconnecting motor, replace the controller directly.

Notes:

Do not keep powering on to avoid burning out more internal components.

Background / Cause:

Abnormal working state of electromagnetic brake. Caused by brake coil damage, loose wiring, insufficient power supply or stuck brake structure.

Solutions:

1.Power off and check brake power line and connector for loose contact or broken wire.

2.Manually test brake release and reset to confirm flexible movement.

3.Detect whether brake coil is open circuit or short circuit, replace damaged coil.

4.Check brake output voltage of controller, repair or replace control board if abnormal.

Notes:

Brake failure will cause door sliding risk, stop using immediately.

Background / Cause:

The actual opening and closing stroke of the door is too small, lower than the system minimum recognized distance, triggering fault prompt.

Solutions:

1.Adjust the installation position of upper and lower limit switches to increase effective stroke.

2.Modify internal travel parameters to adapt to short-stroke doors.

3.Confirm no limit misalignment causing stroke compression.

4.Reperform electronic travel learning after adjustment.

Notes:

This fault mostly appears on small-sized short-stroke doors.

Background / Cause:

This fault occurs when the controller detects excessive current draw, typically caused by a sudden load spike, mechanical binding, motor damage, or a controller hardware fault.

Solutions:

1.Check for mechanical obstructionInspect the door track, rollers, and curtain for jamming, debris, or excessive resistance. Ensure the door moves freely by hand.

2.Test in Jog modeRun the motor in Jog mode. If the fault triggers immediately, the issue is likely with the controller or motor wiring.

3.Verify motor and cable conditionCheck the motor power cable for damage or loose connections. Measure the three-phase winding resistance; values should be balanced with no short to ground.

4.Replace the controller if neededIf the motor and wiring are normal, the controller may have a hardware fault. Swap it with a known working unit to confirm.

Notes:

• Avoid operating the door with excessive load, as this can cause repeated overcurrent faults and damage the motor or controller.

• If the fault occurs only under specific conditions (e.g., high speed), reduce the operating speed or check for binding at that position.

Background / Cause:

This fault is triggered when the controller receives abnormal or no feedback signals from the encoder. It is usually caused by loose wiring, damaged encoder cables, encoder failure, or strong electromagnetic interference.

Solutions:

1.Check encoder cable and connectionsPower off the system and inspect the encoder cable between the motor and controller. Ensure all connectors are tight, pins are not bent, and the cable has no cuts or breaks.

2.Verify encoder mounting and alignmentCheck that the encoder is securely mounted on the motor shaft with no play. Loose mounting can cause unstable signals during operation.

3.Eliminate electromagnetic interferenceSeparate the encoder cable from high-voltage power cables (e.g., motor power wires) to avoid interference. If possible, route the encoder cable in a separate shielded conduit.

4.Avoid manual door movement during operationDo not push or pull the door by hand while the system is powered on, as this can damage the encoder or corrupt its position data.

5.Test with a known good encoder/controllerIf the above steps do not resolve the issue, swap the encoder or controller with a working unit to identify which component is faulty.

Notes:

• Always use shielded encoder cables and ensure the shield is properly grounded to minimize interference.

• If the fault occurs frequently during high-speed operation, check the encoder’s maximum pulse rate rating against the door speed.

Background / Cause:

This fault is triggered when the controller detects a mismatch between the motor’s actual rotation direction and the feedback from the encoder. It is usually caused by incorrect encoder wiring, reversed motor phase sequence, or wrong direction parameters.

Solutions:

1.Check encoder wiring sequenceVerify the encoder signal wires (A/B phase) are connected correctly to the controller. Swapped A/B phases will reverse the direction signal and trigger this fault.

2.Swap motor power phases if rotation is reversedIf the door moves in the opposite direction to the command, swap any two of the three motor power phases to correct the rotation direction.

3.Verify encoder direction parametersAccess the controller settings to check if the encoder direction parameter matches the motor’s rotation. Adjust the setting if needed.

4.Re-run position learningAfter correcting wiring or parameters, perform a full electronic travel learning to reset the encoder position data.

Notes:

• Do not operate the door with reversed direction, as this can damage the mechanical stops or encoder.

• Always power off the system before adjusting motor or encoder wiring to avoid damage.

Background / Cause:

This fault indicates the controller is not detecting all three motor phases. It is usually caused by loose motor cables, damaged motor windings, or a faulty controller output.

Solutions:

1.Check motor power connectionsInspect the three-phase power cable between the controller and motor. Ensure all terminals are tight and no wires are broken or burnt.

2.Test motor winding resistanceMeasure the resistance of each motor phase at the controller end. The three values should be balanced (within ±5% of each other) and show no continuity to ground.

3.Verify the controller outputIf the motor and cable are normal, test the controller output phases with a multimeter. If no output is detected, the controller’s power stage may be damaged.

4.Replace faulty componentsIf resistance is unbalanced, the motor winding is damaged and needs replacement. If the motor is good, replace the controller.

Notes:

• Do not run the motor repeatedly with this fault, as it can cause permanent damage to the windings.

• Always power off the system before checking motor connections to avoid electric shock.

Background / Cause:

This fault is triggered when the controller cannot detect proper brake release or operation. It is typically caused by loose wiring, a damaged brake coil, mechanical jamming of the brake mechanism, or a faulty controller output.

Solutions:

1.Inspect brake wiring and connectionsPower off the system and check the brake power cable and terminals. Ensure all wires are tight, not damaged, and securely connected to both the controller and the motor brake.

2.Verify brake mechanical operationManually release the brake lever (if available) to confirm the brake mechanism moves freely. Check for wear, rust, or debris that may cause jamming.

3.Test the brake coil resistanceUse a multimeter to measure the resistance of the brake coil. Compare the reading with the specification (typically around 100–200Ω, depending on the model). An open circuit or short circuit indicates a damaged coil.

4.Check controller brake outputIf the brake and wiring are normal, test the controller’s brake output signal. If no voltage is present during brake release, the controller’s output circuit may be faulty.

5.Replace faulty componentsReplace the brake assembly if the coil or mechanism is damaged. If the brake is good, replace the controller to resolve the output fault.

Notes:

• Never operate the motor with a stuck brake, as this can cause severe overheating and permanent damage to both the motor and brake.

• Always confirm the brake releases fully before testing the door under load.