YASKAWA SI-EP3 Installation Manual

Also see for SI-EP3: Technical manual Technical manual Technical manual Installation manual

Contents

YASKAWA ELECTRIC TOBP C730600 89D YASKAWA AC Drive Option SI-EP3 Installation Manual 579 Troubleshooting9 Troubleshootingu Drive-Side Error CodesDrive-side error codes appear on the drive keypad. Table 13 lists causes of the errors andpossible corrective actions. Refer to the drive Technical Manual for additional error codesthat may appear on the drive keypad.n FaultsBoth bUS (Option Communication Error) and EF0 (Option Card External Fault) can appearas either an alarm or as a fault. When a fault occurs, the keypad ALM LED remains lit.When an alarm occurs, the keypad ALM LED flashes.Check the following items first when an error code occurs on the drive:• Communication cable connections• Make sure the option is properly installed to the drive• Operation status of the controller program and controller CPU• Did a momentary power loss interrupt communications?Table 13 Fault Displays, Causes, and Possible SolutionsKeypad Display Fault NamebUSOption Communication Error• After establishing initial communication, the connection was lost.• Only detected when the run command frequency reference is assigned to theoption (bl-01 = 3 or bl-02 = 3).Cause Possible SolutionNo signal was received from thePLC. • Check for faulty wiring.• Correct any wiring problems.Faulty communications wiringAn existing short circuit orcommunications disconnection Check disconnected cables and short circuits and repair as needed.A data error occurred due toelectric interference.• Counteract noise in the control circuit, main circuit, and ground wiring.• If a magnetic contactor is identified as a source of noise, install a surge absorberto the contactor coil.• Use only recommended cables or other shielded line. Ground the shield on thecontroller side or the drive input power side.• Separate all communication wiring from drive power lines. Install an EMCnoise filter to the drive power supply input.• Counteract noise in the master controller (PLC).The option is not properlyconnected to the drive. Reinstall the option.Option is damaged. If there are no problems with the wiring and the error continues to occur, replacethe option.