6.4 Fault Detection 6.4 Fault Detection u Fault Displays, Causes and Possible Solutions Table 6.7 Detailed Fault Displays, Causes and Possible Solutions Troubleshooting 6 SIEP C710606 33A OYMC AC Drive – J1000 User Manual 123 LED Operator Display Fault Name CE MEMOBUS/Modbus Communication Error No data was received for longer than 2 seconds. Cause Possible Solution Faulty communications wiring, or a short circuit exists. • Check for faulty wiring. • Correct the wiring. • Check for loose wiring and short circuits. Repair as needed. A communications data error occurred due to noise. • Check the various options available to minimize the effects of noise.
• Counteract noise in control circuit, main circuit, and ground wiring. • Use OYMC-recommended cables, or another type of shielded line. Ground the shield on the controller side or on the drive input power side. • Ensure that other equipment such as switches or relays do not cause noise and use surge suppressors if required. • Separate all wiring for communications devices from drive input power lines. Install a noise filter to the input side of the drive input power. LED Operator Display Fault Name CoF Current Offset Fault There is a problem with the current detection circuit.
Cause Possible Solution While the drive automatically adjusted the current offset, the calculated value exceeded the allowable setting range. Replace the drive. LED Operator Display Fault Name or CPF00 or CPF01 CPF11 – RAM Fault CPF12 – Problem with the ROM (FLASH memory) CPF14 – CPU error (CPU operates incorrectly due to noise, etc.) CPF17 – A timing error occurred during an internal process CPF18 – CPU error (CPU operates incorrectly due to noise, etc.) Cause Possible Solution Hardware is damaged. Replace the drive. LED Operator Display Fault Name CPF02 A/D Conversion Error An A/D conversion error occurred. Cause Possible Solution Control circuit is damaged. Cycle power to the drive.
If the problem continues, replace the drive. Control circuit terminals have shorted out (+V, AC). • Check for wiring errors along the control circuit terminals. • Correct the wiring. Check the resistance of the speed potentiometer and related wiring. Control terminal input current has exceeded allowable levels. • Check the input current. • Reduce the current input to control circuit terminal (+V) to 20 mA. LED Operator Display Fault Name CPF06 EEPROM Data Error There is an error in the data saved to EEPROM. Cause Possible Solution Control circuit is damaged. Cycle power to the drive. If the problem continues, replace the drive.
The power supply was switched off when parameters were written (e.g., using an option unit). Reinitialize the drive (A1-03). LED Operator Display Fault Name CPF08 EEPROM Communication Fault EEPROM communications are not functioning properly. Cause Possible Solution Control circuit is damaged. Cycle power to the drive. If the problem persists, replace the drive. LED Operator Display Fault Name or CPF20 or CPF21 One of the following faults occurred: RAM fault, FLASH memory error, watchdog circuit exception, clock error • RAM fault. • FLASH memory error (ROM error). • Watchdog circuit exception (self-diagnostic error). • Clock error. Cause Possible Solution Hardware is damaged.
Replace the drive.