Fault Rectification

Only qualified electricians are allowed to maintain the VFD. Before working on the VFD, read the safety instructions in the Safety Precautions section.

6.2.1 Alarm and Fault Indications

Faults are indicated by LEDs. Refer to the Operation Procedure. When the TRIP light is on, an alarm or fault message on the panel display indicates an abnormal condition of the VFD. P07.27-P07.32 record the latest 6 fault types, and P07.33-P07.56 record the operational data for the latest 3 fault types. Using the information in this section, most alarm and fault causes can be identified and corrected. If the issue is not resolved, contact the INVT office.

6.2.2 Fault Reset

The VFD can be reset by pressing the STOP/RST button, through digital input, or by switching the power light off. Once the fault is cleared, the motor can be restarted.

6.2.3 Fault Instructions and Solutions

When a fault occurs on the VFD, follow these steps:

   • Check the keypad to ensure there is no issue. If no issues are found, contact the local INVT office.
   • If no problems are found, check P07 and review the fault parameters recorded when the current fault occurred, along with all related parameters.
   • Review the table below for detailed solutions and check the corresponding abnormal condition.
   • Clear the fault and seek additional help if necessary.
   • Clear the fault and perform a fault reset to restart the VFD.

P07.27 Current fault type:
P07.28 Previous fault type 1:
P07.29 Previous fault type 2:
P07.30 Previous fault type 3:
P07.31 Previous fault type 4:
P07.32 Previous fault type 5:

Code: 6

   • Current Fault: 0 - No fault

   • 4: OC1 – Over-current during acceleration
   • 5: OC2 – Over-current during deceleration
   • 6: OC3 – Over-current at constant speed
   • 7: OV1 – Over-voltage during acceleration
   • 8: OV2 – Over-voltage during deceleration
   • 9: OV3 – Over-voltage at constant speed
   • 10: UV – DC bus under-voltage
   • 11: Motor overload (OL1) – Motor is overloaded
   • 12: VFD overload (OL2) – VFD is overloaded
   • 15: Rectifier module overheating (OH1)
   • 16: Inverter module overheating fault (OH2)
   • 17: External fault (EF)
   • 18: 485 communication fault (CE)
   • 21: EEPROM operation fault (EEP)
   • 22: PID response offline fault (PIDE)
   • 24: Running time expiration (END)
   • 25: Electrical overload (OL3)
   • 36: Under-voltage fault (LL)

P07.33 Current operating frequency:

   • 0.00Hz – Current operating frequency.

P07.34 Ramp reference frequency:

   • 0.00Hz – Reference frequency at the current fault.

P07.35 Output voltage during current fault:

   • 0V – Output voltage during the current fault.

P07.36 Output current during current fault:

   • 0.0A – Output current during the current fault.

P07.37 DC bus voltage during current fault:

   • 0.0V – DC bus voltage during the current fault.

P07.38 Highest temperature during current fault:

   • 0.0°C – Highest temperature recorded during the current fault.

P07.39 Input terminal status:
This parameter indicates the status of the input terminals at the time of the current fault.