Connect control power

L1C/L2C and main

power L1/ L2 and L3.

L1C and L2C are not

well connected

The control power

voltage is abnormal.

Set the S-ON 

signal to ON.

Input position

reference

Input reference pulse

counter (U0-09) is 0.

Position reference is not entered:

Whether DI_3 is set as forward drive prohibition or DI_4 is set as reverse drive prohibition.

Check if the DI command pulse inhibit function set by accident.

The load inertia ratio

is too large.

Servo system runs

normally.

Unsatisfactoryposition

deviation generated.

The pulse received(U0-09) is not consistent with the actual position machine.

Whether the equipment is vibrating, adjust by gain.

Check the coupling at the motor shaft locked well.

Connect control power

 L1C/L2C and main

power L1/ L2 and L3.

The LED display or green indicator is off

(bus voltage indicator)

L1C and L2C are

not well connected

The control power

voltage is abnormal.

The Servo drive

is faulty

Refer to 7.2 Faults and Alarms information, find the cause and troubleshoot.

Set the S-ON

signal to ON.

Shaft of Servo Motor

is in free running

status.

Selection of control

mode is incorrect.

Input speed

reference

Servo motor does not

rotate or the speed is

not as expected

Speed reference

(U0-03) is 0.

The analog interface wiring is incorrect. Refer to Chapter 4 for correct wiring. No speed reference:

Whether DI_3 is set as forward drive prohibition or DI_4 is set as reverse drive prohibition.

Whether the reference pulse inhibit input function of DI is used.

Check if the P1-1 speed reference source setting is correct.

When using the internal speed reference, check if P1-2 internal speed command is 0.

Servo motor jitters

at low speed

Motor speed is

not steady.

The load inertia

ratio is too large.

Motor shaft vibrates

left and right.

The load inertia

ratio is too large.

The analog interface wiring is incorrect. Refer to Chapter 4 for correct wiring. No speed reference:

Whether DI_3 is set as forward drive prohibition or DI_4 is set as reverse drive prohibition.

Whether the reference pulse inhibit input function of DI is used.

Check if the P1-1 speed reference source setting is correct.

When using the internal speed reference, check if P1-2 internal speed command is 0.

Internal parameters stored version, total number, range, etc.

The possible reasons are:

1. The driver has been software upgraded.

2. A momentary power failure occurred during parameter storage.

3. Frequent writing of parameters.

1. If the parameter storage is abnormal due to the program update, please update the parameters by restoring the factory default parameters and power on again.

2. Power on again and reset the parameters after restoring the factory settings.

3. Check whether the host computer frequently writes parameters and modify the corresponding parameter writing method.

The driver has detected an overcurrent. The possible reasons are:

1. Motor power lines U, V, W are shorted to ground.

2. Short circuit among motor power line U, V, W phase.

3. The motor power cables U, V, W have poor contact.

4. Internal damage of the motor.

5. The encoder wire is aging and loose.

6. Excessive fluctuations in control power.

1. Please check whether the motor power line wiring is correct.

2. Whether the motor power line wiring is loose or short-circuited.

3. Replace the motor power line.

4. Replace the motor.

5. Replace the encoder cable.

6. If the above methods still could not eliminate the fault, please contact the manufacturer.

Driver bus voltage is below the limit:

(1) 220V driver: normal bus voltage is 310V, undervoltage threshold is 200V.

(2) 380V driver: normal bus voltage is 540V, undervoltage threshold is 400V.

Possible reasons for undervoltage of the main power supply are:

(1) The main power source is not connected.

(2) The input voltage is low, or the voltage drops.

(3) The internal main power relay is damaged.

1. Check if the input voltage of the driver is too low. If it is too low, please increase the voltage or wait for the power supply to be normal, then power on again and see if the fault is cleared.

2. Check the input power voltage of the driver to see if the voltage drops due to the power load change.

The driver detects that the bus voltage is too high. The possible reasons are:

1. Check whether the input voltage is normal:

(1) 220V driver power supply voltage range: -10% - + 10% (198V - 242V)

(2) 380V driver power supply voltage range: -10% - + 10% (342V - 418V)

2. The regenerative resistor resistance is too large, resulting in the braking energy not being absorbed in time.

3. The load inertia is large and the motor accelerates and decelerates too quickly, and the maximum braking energy exceeds the absorbable value.

4. Excessive deviation of bus voltage detection

1. Check whether the mains input voltage is too high.

2. Check whether the regenerative resistor resistance is reasonable.

3. Extend the acceleration / deceleration time and choose a regenerative resistor with a lower resistance value.

1. When using the internal regenerative resistor, the jumper between C and D be disconnected.

2. When using an external regenerative resistor, the resistor is not connected.

3. The regenerative resistor status detection circuit is abnormal.

1. If using internal regenerative resistor, please confirm whether the short-circuit jumper between C / D is normal.

2. If using an external regenerative resistor, make sure that the external regenerative resistor is connected securely.

3. If an external regenerative resistor is used, please confirm whether the resistance of the regenerative resistor is reasonable.

4. If above methods still could not eliminate the fault, please contact the manufacturer.

The brake resistor vent is turned on, but no feedback signal is detected. The possible reasons are:

1. Failed to open the regenerative resistor.

2. Brake resistor feedback detection failure.

1. Check whether the wiring of the motor encoder cable is loose. If it is loose, tighten it.

2. Replace the encoder cable and power on again.

No Z-pulse signal appears when the motor rotates more than 1 turn.

The possible reasons are:

1. Motor model is wrong.

2. The motor encoder is disturbed or damaged.

1. Check whether the motor model matches the model of the driver.

2. Replace the motor and power on again.

The incremental encoder AB count value is not equal to the ppr * 4. The possible reasons are:

1. Motor model is wrong.

2. Motor encoder is disturbed or damage.

1. Check if the motor power line wiring is loose, and tighten it if it is loose.

2. Change the power cable of the motor, and then power on again.

Exceeds the maximum speed threshold of function code P1-10. Possible reasons are:

1. U / V / W phase sequence of motor power line is wrong.

2. Motor model is wrong.

3. Motor power line error.

4. Motor encoder line error.

1. Please check whether the motor power line is correctly connected.

2. Confirm whether the motor model is correct.

3. Use the correct power cable and encoder cable to connect the wiring.

The power module temperature exceeds the normal value. The possible reasons are:

1. The cooling fan fails.

2. The ambient temperature is too high.

3. The installation of the driver is not reasonable, and the interval is too small then cause abnormal heat dissipation.

1. Check if the cooling fan is running normally. If not, replace the drive.

2. Improve the ambient temperature.

3. Install the Servo driver according to the standard.

The drive has detected that the motor is overloaded. The possible reasons are:
 1. The load is too large, and the motor works for a long time in a state exceeding the rated torque.

2. Large load inertia and frequent acceleration and deceleration.

3. The speed and position loop gain parameters are not set properly.
 4. Locked rotor occurs in the motor.
 5. Servo drive failure.

1. Check whether the load of the motor is too large. If the load is too large, please replace the motor and driver with higher power.

2. Increase the acceleration / deceleration time.

3. Use the host computer software to observe the actual torque and observe whether there is obvious speed overshoot. Adjust appropriate loop gain parameters.

4. Check the mechanical connection and troubleshoot.

5. Replace the Servo driver.

The deviation of the current position pulse exceeds the setting value of [P0-26]( Position deviation limit). The possible reasons for this failure are:

1. The U / V / W line of the motor is not connected or disconnected.

2. The phase sequence of U / V / W wire of the motor is wrong.

3. The motor is overloaded or stalled.

4. The driver gain setting is unreasonable.

5. The position reference speed changes too fast.

1. Check whether the wiring of the motor power line U / V / W is normal.

2. Check the load of the motor. If the load is too large, please replace the driver and motor with higher power. if the stall occurs, please check the machinery.

3. Adjust the gain parameters according to the method in the chapter 6.3 in the user manual.

4. When the change of the position reference speed is too large, the ramp time could be appropriately increased to reduce the speed change rate.

The torque reached the maximum torque limit value and exceeds the setting time of the [P1-19] function code. The possible reasons are:

1. If the load is too large, the driver would output at the maximum torque and still couldnot reach the target speed within the predetermined time.

2. Whether the maximum forward torque limit and maximum reverse torque limit are set too small.

3. The motor stalls.

4. [P1-19] The set torque limit time is too short.

1. Check whether the load is too large.

2. Modify the forward torque limit and maximum reverse torque limit to appropriate values according to the actual application.

3. Check whether the machine stalls. 

4. Confirm whether the setting of function code [P1-19] is reasonable.

1. Check whether it is artificial emergency shutdown protection. If it is, then power on again after other system faults are cleared.

2. If it is a false trigger, please check whether the wiring and function configuration of the DI terminal is normal.

1. When the regenerative resistor is selected as the internal regenerative resistor, it means overheat. 

2. When the regenerative resistor is externally connected, it represents overload.

1.Please confirm whether the load inertia is too large.

2.Please confirm whether it is frequently started and stopped and whether the speed is too high.

3.Please check whether the actual resistance value is larger than the set value.