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Wiring Details
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Faults & Alarms
Search from below list for VFD-V drive faults & alarms:
| Fault Code | Cause & Solution |
|---|---|
| EF External fault | Cause: External EF terminal closed, and the AC drive would stop the output. – External Fault- This is programmable fault, comes when drive received external signal for external fault. ‹ Soultion: – Eliminate the fault source and then press the RESET button – Give RESET command after fault has been cleared. |
| bb External Base Block | Cause: This fault comes when drive received this command. – When this function is set for the external multi-function input terminals (MI1~MI6), the AC drive will stop the output Soultion: 1. When the external input terminal (B.B) is active, the AC motor drive output will be turned off. 2. Deactivate the external input terminal (B.B) to operate the AC motor drive again. 3. After the signal source is eliminated, “bb” disappeared immediately |
| Lu/Lv Low Voltage | Cause: DC high-voltage side is exceedingly low within the AC drive Soultion: – Check whether the input power voltage is normal – Check whether the loading will be put on another unexpected heavy loading – Whether the 3-phase model is of the single-phase power input or the phase-lacking |
| bF Brake resistor fault | Cause: Brake resistor fault Soultion: 1. If the fault code is still displayed on the keypad after pressing “RESET” key, then there is an hardware issue in drive need to repair or replace drive. |
| cc current clamp | Meaning: cc (current clamp) hardware protection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive. |
| cE- Communication error | Cause: Communication error. ‹ Soultion: – Check whether the communication signal is counter-connected (RJ11) – Check whether the communication form is correct |
| oc Overcurrent | Cause: Output current of the AC drive exceeds the OC level ‹ Soultion: – Extend the accel/decel time – Check whether the motor rating and the AC drive rating match up with each other – Check whether there is short-circuit among U-V-W of the AC drive – Check whether the wiring to the motor is short-circuited or grounded – Check whether the screw between the AC drive and the motor is tightened or not – Check whether the motor is over loaded |
| ov/ou overvoltage | Cause: DC voltage of the main circuit exceeds the over-voltage detection level – 230 V Series: about 400V – 460 V Series: about 800V Soultion: – Check whether the input voltage is within the scope of the rated input voltage of the AC drive, and monitor whether there is any occurrence of the voltage transients – If it is of the motor inertia uprising voltage that caused the exceeding voltage on the DC high-voltage side within the AC drive, the solution is to extend the accel/decel time or install the braking resistor (optional) |
| oH1 IGBT overheat | Cause: The AC motor drive detects IGBT overheating and exceeds the protection level. – Temperature of the cooling fan of the transistor module exceeds the allowable value. Soultion: 1. Check if the ambient temperature or temperature inside the cabinet is too high, or if there is obstruction in the ventilation hole of the control cabinet. – Check the ambient temperature. – Regularly inspect the ventilation hole of the control cabinet. – Change the installed place if there are heating objects, such as brake resistors, in the surroundings. – Install/ add cooling fan or air conditioner to lower the temperature inside the cabinet. 2. Check if there is any obstruction on the heat sink or if the fan is running -Remove the obstruction or replace the cooling fan. 3. Insufficient ventilation space – Increase ventilation space of the drive. 4. Check if the drive matches the corresponded loading – Decrease loading. – Decrease the carrier wave. – Replace with a drive with larger capacity. 5. The drive has run 100% or more of the rated output for a long time. – Replace with a drive with larger capacity. |
| oL overload | Cause: AC drive overload- Output current exceeds the AC drive-bearable current; e.g. could sustain for 60 seconds if the output is 150% of the AC drive rated current. ‹ Soultion: – Decrease the loading and extend the acceleration time – Check whether the motor is overloaded – Decrease the (Pr. 07-02) torque level-up setting – Increase the AC drive output capacity |
| oL1 Motor overload | Cause: Internal electronic thermal relay protections. ‹ Soultion: – Decrease the loading – Check whether the motor is overloaded – Check whether the rated current value of the motor (Pr. 07-00) is appropriate – Check the electronic thermal relay’s function setup – Increase the motor capacity |
| oL2 Motor overload | Cause: OL2- motor overload Motor with exceedingly great loading ‹ Soultion: – Check whether the loading of the motor is too great – Check the setting of the over-torque detection level (Pr. 06-03 ~ 06-05) |
| EF External fault | Cause: External EF terminal closed, and the AC drive would stop the output. – External Fault- This is programmable fault, comes when drive received external signal for external fault. ‹ Soultion: – Eliminate the fault source and then press the RESET button – Give RESET command after fault has been cleared. |
| HPF Hardware fault | Cause: Fault occurred within the protection circuit of the controller. Soultion: – Check every appliance that connects to the AC drive. – After this same fault comes then there is an hardware issue in drive need to repair or replace drive. |
| ocA Over-current during acceleration | Cause: Over-current during acceleration (Output current exceeds triple rated current during acceleration.). Soultion: 1. Short-circuit at motor output: Check for possible poor insulation at the output lines. 2. Acceleration Time too short: Increase the Acceleration Time. 3. AC motor drive output power is too small: Replace the AC motor drive with the next higher power model. |
| ocd Over-current during deceleration | Cause: Over-current during deceleration (Output current exceeds triple rated current during deceleration.) Soultion: 1. Short-circuit at motor output: Check for possible poor insulation at the output line. 2. Deceleration Time too short: Increase the Deceleration Time. 3. AC motor drive output power is too small: Replace the AC motor drive with the next higher power model. |
| ocn Over-current during steady state operation | Cause: Over-current during steady state operation (Output current exceeds triple rated current during constant speed.) Soultion: 1. Short-circuit at motor output: Check for possible poor insulation at the output line. 2. Sudden increase in motor loading: Check for possible motor stall. 3. AC motor drive output power is too small: Replace the AC motor drive with the next higher power model. |
| GFF Ground Fault | Meaning: When the drive detects grounding short circuit on the output terminals (U/V/W), the drive closes the gate of the output immediately, the motor runs freely, and the display shows a GFF error. Cause & Solution: 1. Motor burnout or aging insulation occurred – Check the motor insulation value with megger. – Replace the motor if the insulation is poor. 2. Short circuit due to broken cable – Troubleshoot the short circuit. – Replace the cable. 3. Larger stray capacitance of the – cable and terminal – If the motor cable length exceeds 100 m, decrease the setting value for the carrier frequency. – Take remedies to reduce stray capacitance. 4. Malfunction caused by interference – Verify the grounding and wiring of the communication circuit. It is recommended to separate the communication circuit from the main circuit, or wire in 90 degree for effective anti-interference performance. 5. Hardware failure – Cycle the power after checking the status of motor, cable and cable length. If GFF still exists, return to the factory for repair. |
| Lu/Lv Low Voltage | Cause: DC high-voltage side is exceedingly low within the AC drive Soultion: – Check whether the input power voltage is normal – Check whether the loading will be put on another unexpected heavy loading – Whether the 3-phase model is of the single-phase power input or the phase-lacking |
| cF1 Internal EEPROM can not be programmed | Cause: Internal EEPROM can not be programmed. Soultion: 1. Press “RESET” key to the factory setting 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive. |
| cF2 Internal EEPROM can not be read | Cause: Internal EEPROM can not be read. Soultion: 1. Press “RESET” key to the factory setting 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive. |
| cF3 | Cause: AC drive’s detection circuit fault. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| bb External Base Block | Cause: This fault comes when drive received this command. – When this function is set for the external multi-function input terminals (MI1~MI6), the AC drive will stop the output Soultion: 1. When the external input terminal (B.B) is active, the AC motor drive output will be turned off. 2. Deactivate the external input terminal (B.B) to operate the AC motor drive again. 3. After the signal source is eliminated, “bb” disappeared immediately |
| SC/5C Short circuit | Cause: Output side of the AC drive is short circuited. Soultion: – Check whether the motor’s resistance and insulation are functioning right. – Check motor & motor cable. |
| bF Brake resistor fault | Cause: Brake resistor fault Soultion: 1. If the fault code is still displayed on the keypad after pressing “RESET” key, then there is an hardware issue in drive need to repair or replace drive. |
| oH2 Braking transistor over-heat | Cause: Braking transistor over-heat. Soultion: – Check the fan and the ambient temperature – Review the braking time and the braking resistor’s rate of usage |
| FUSE Broken fuse | Cause: Broken fuse- The transistor module of the main circuit is broken – A fused DC circuit fuse Soultion: – Check whether the fuse of the transistor module is functioning right – Check whether the loading side is short circuited or grounded |
| ct1 | Cause: The A/D1 changer within the CPU is defected Soultion: – Replace the controller or the current sensor |
| ct2 | Cause: The A/D2 changer within the CPU is defected Soultion: 1. Replace the controller or the current sensor |
| PId PID motion error | Cause: PID motion error. ‹ Soultion: – Check the PID feedback wiring – Check whether the setting of the parameter is appropriate |
| AcI ACI analog signal loss | Cause: Analog input current loss (including all analog 4–20 mA signals) – When the analog input is lower than 4 mA (only detects analog input 4–20 mA) Solution: 1. Loose or broken ACI wiring – Tighten the terminals again. – Replace with a new cable. 2. External device error – Replace with a new device. 3. Hardware error – If the AcI error still occurs after checking all the wiring, then need to repair drive. |
| cc current clamp | Meaning: cc (current clamp) hardware protection error when power is ON. Cause & Solution: 1. Hardware failure – Cycle the power. 2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive. |
| uEC/vEc R1 setting error | Cause: R1 setting error. ‹ Soultion: 1. Re-do the setting or execute the Tuning function. |
| PHL Phase loss | Cause: Power input phase-lacking Phase-lacking within the input power of the AC drive Three imbalanced conditions existed within the input voltage ‹ Soultion: – Check whether the power voltage is normal. – Check whether the screw at the input power terminal is tightened. |
| FAn Fan fault | Cause: There is an issue in drive cooling fan. Soultion: 1. Check whether the fan is blocked ‹2. After this same fault comes then there is an hardware issue in drive need to repair or replace drive. |
| ErTUn Auto-tune Fail | Cause: The motor parameter-Tuning-failed. ‹ Soultion: – Re-check the wiring and reset the parameter |
| cE- Communication error | Cause: Communication error. ‹ Soultion: – Check whether the communication signal is counter-connected (RJ11) – Check whether the communication form is correct |
| Er-26 | Cause: Upper and lower legs of PWM are of the same LOW level. Soultion: There is an hardware or software issue in drive. Need to repair or replace drive. |
| ErPU KEYPAD communication overtime | Cause: KEYPAD communication overtime Soultion: – Check whether the communication circuit is well-conducted. |
| Er485 RS485 communication overtime | Cause: RS485 communication overtime Soultion: – Check whether the communication circuit is well-conducted. |