Yaskawa Modbus TCP/IP SI-EM3D Manual de usuario descargar pdf (Pagina 41)

10 Troubleshooting

Drive-Side Error Codes

Drive-side error codes appear on the drive digital operator. Causes of the errors and corrective

actions are listed below. Refer to the drive manual for additional error codes that may appear

on the drive digital operator.

Faults

Both bUS (Option Communication Error) and EF0 (Option Card External Fault) can appear

as an alarm or as a fault. When a fault occurs, the digital operator ALM LED remains lit.

When an alarm occurs, the ALM LED flashes.

If communication stops while the drive is running, use the following questions as a guide to

help remedy the fault:

• Is the option properly installed?

• Are the communication lines properly connected to the option? Are the wires loose?

• Is the controller program working? Has the controller/PLC CPU stopped?

• Did a momentary power loss interrupt communications?

Digital Operator Display Fault Name

bUS

Option Communication Error

• The connection was lost after establishing initial communication.

• Only detected when the Run command or frequency reference is assigned to

the option (b1-01 = 3 or b1-02 = 3).

Cause Possible Solution

Master controller (PLC) has

stopped communicating

• Check that power is supplied to the PLC

• Check that PLC is not in program mode

Communication cable is not

connected properly

• Check for faulty wiring

• Correct any wiring problems

A data error occurred due to noise

• Check the various options available to minimize the effects of noise

• 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 absorber

to the contactor coil

• Make sure the cable used meets requirements

• Make sure the option ground wire is connected between option FE terminal

and the drive ground terminal connected to earth ground

Option is damaged

If there are no problems with the wiring and the error continues to occur, replace

the option.

10 Troubleshooting

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