Nidec & Control Technique NE200 & NE300 Drive

Nidec & Control Technique NE200 & NE300 Drive Fault Codes:

Fault Code and MeaningCause and Remedy
Uu1
Bus Under voltage during running
Cause:


Power grid low voltage.



Remedy:

  • Check the input power source.
OC1
Over current in Acceleration
Cause:


1. Acceleration time too short.

2. Power grid low voltage.

3. Inverter power rating too small.



Remedy:

  • Increase the acceleration time.

  • Check the input power source.

  • Choose inverter with higher capacity.
OC2
Over current in Deceleration
Cause:


1. Deceleration time too short.

2. Large load inertia.

3. Inverter power rating too small.



Remedy:

  • Increase the deceleration time.

  • Add suitable brake devices.

  • Choose higher capacity drive.
OC3
Over current at constant-speed
Cause:


1. Abnormal Load mutation.

2. Power grid low voltage.

3. Inverter power rating too small.

4. Encoder sudden offline in closed-loop vector control.



Remedy:

  • Check the load.

  • Check the input power source.

  • Choose higher capacity drive.

  • Check the encoder and its wiring.
Ou1
Over Voltage in Acceleration
Cause:


1. Acceleration time too short.

2. Power supply abnormal.



Remedy:

  • Increase the acceleration time.

  • Check the input power source.
Ou2
Over voltage in deceleration
Cause:


1. Deceleration time too short.

2. Large load inertia.



Remedy:

  • Increase the deceleration time.

  • Add suitable brake devices.
Ou3
Over voltage in constant speed
Cause:


1. Power supply abnormal.

2. Large load inertia.



Remedy:

  • Check the input power source.

  • Add suitable braking devices.
GF (NE300 Only)
Ground Fault
Cause:


1. One output phase got short circuit problem.



Remedy:

  • Check whether the electric motor insulation is weakening.

  • Check whether the wiring between the frequency converter and the electric motor is damaged.
SC
Load short-circuit
Cause:


1. Wiring of inverter and motor get phase-to-phase short circuit.

2. Damage of the inverting module IGBT.



Remedy:

  • Check whether the electric motor coil is short circuit.

  • Ask for the services from manufactures.
OH1
Heat-sink over heat
Cause:


1. Ambient temperature too high.

2. Fan is damaged.

3. Fan air duct is blocked.



Remedy:

  • Lower the ambient temperature.

  • Change the fan.

  • Clear the air duct.
OL1
Motor overload
Cause:


1. Power supply abnormal.

2. Motor rated current set wrongly.

3. The Curve of V/F is not fit.

4. Motor always works with heavy load at low speed.

5. Motor blocked to stall or sudden large load change.

6. Motor power too low.



Remedy:

  • Check the input power source.

  • Check whether the motor’s rated current is correctly set up.

  • Adjust the V/F curve and torque boosting performance.

  • Use specialized electric motor.

  • Check whether the motor or the load is blocked to stall or not.

  • Use motor and inverter of suitable power ratings.
OL2
Inverter overload
Cause:


1. Low voltage in power grid.

2. Load too heavy.

3. Acceleration too fast.

4. Restart the motor still in turning.



Remedy:

  • Check the input power source.

  • Select bigger capacity inverter.

  • Increase the acceleration time.

  • Avoid restarting when the motor is in rotation.
EF0
Communication fault
Cause:


1. Baud rate and parity checksum is set incorrect.

2. Communication interrupted for long time.



Remedy:

  • Check communication parameters correct or not.

  • Check the interface wiring.
EF1
External terminal fault
Cause:


1. Faults comes from external control circuit.



Remedy:

  • Check the external input.
SP1
Input phase loss
Cause:


1. Input R,S,T have phase loss or imbalance.



Remedy:

  • Check input voltage.
SPO
Output phase loss
Cause:


1. There is lack of U,V,W when output.

2. There is a serious unbalance in output.



Remedy:

  • Check U-V-W motor wiring.

  • Check the load.
EEP
EEPROM error
Cause:


1. Function code parameter writing error.

2. EEPROM damaged.



Remedy:

  • Recover factory defaults.

  • Ask for service from supplier.
CCF
Keypad & control board communication interrupted
Cause:


1. Connection cable between keyboard and control panel is broken.



Remedy:

  • Check the connection cable between keyboard and control panel.
bCE
Brake unit fault
Cause:


1. The braking line or braking pipe is broken.

2. Brake resistor is too lower.



Remedy:

  • Check the brake unit, change the brake pipe.

  • Choose the suitable braking resistor.
PCE
Parameter copy Error
Cause:


1. Too long connection cable between keypad and control board leads to interference in parameters transmission.

2. The downloading parameters do not match the existed parameters in the inverter.



Remedy:

  • Shorten the cable between Keyboard and control board to reduce interference.

  • Before downloading, make sure the parameters match the inverter.
IDE
IDE Hall current detection fault
Cause:


1. The current sensoring or hall device get damaged.



Remedy:

  • Ask for service from supplier.
ECE (NE300 Only)
Encoder fault
Cause:


1. Encoder signal wires are connected reversely.

2. Encoder signal wires get damaged.

3. Encoder damaged.

4. Dual-way encoder detected motor direction is not match.



Remedy:

  • Check whether the encoder signal is correctly connected.

  • Check whether the encoder wiring is broke.

  • Change the encoder.

  • Change the encoder direction (F3.16) or alter motor wiring sequence.
LC
Fast current limit fault
Cause:


1. Load too large or motor blocked to stall.

2. Inverter power rating too small.

3. Inverter output circuit loop grounded or SC.



Remedy:

  • Decrease the load and check motor and mechanical part status.

  • Choose higher power inverter.

  • Remove the external fault.
EF2
Terminal close fault
Cause:


1. The FWD or REV terminals close and get power on. But inverter is set to not allow the restart after power failure recovery.



Remedy:

  • Disconnect the FWD or REV terminal first and then power on the inverter.

  • Close the fault detection function for closed terminal fault (FC.11=0).
PIDE
PID feedback error
Cause:


1. PID feedback offline.



Remedy:

  • Check PID feedback line.

  • Disable PID feedback detection (F8.24=0.0%).

  • Increase PID feedback offline detection time (F8.25).
OLP2
Overload pre-alarm error
Cause:


1. Frequency inverter output current is higher than set pre-alarm threshold.



Remedy:

  • Disable pre-alarm function (FC.19=0).

  • Increase pre-alarm threshold value (FC.02).

  • Increase pre-alarm detection time (FC.03).