Fault codebUS
The drive did not receive a signal from the controller due to wiring errors or communication issues. The manual's first action is: “Check for wiring errors.”
- Model
- YASKAWA SI-P3
- Display shows
- Option Communication Error (bUS)
- Type
- Fault code
- Source
- Manual p. 56
What bUS means
Option Communication Error p. 56
Common causes
- The drive did not receive a signal from the controller. p. 56
- The communications cable wiring is incorrect. p. 56
- An existing short circuit or communications disconnection. p. 56
- A data error occurred due to electric interference p. 56
- Option is damaged p. 56
What to do
- Check for wiring errors. p. 56
- Correct the wiring. p. 56
- Check disconnected cables and short circuits and repair as needed. p. 56
- ['Prevent noise in the control circuit, main circuit, and ground wiring.', 'If you identify a magnetic contactor as a source of noise, install a surge absorber to the contactor coil.', 'Use only recommended cables or other shielded line. Ground the shield on the controller side or the drive input power side.', 'Separate all communication wiring from drive power lines. Install an EMC noise filter to the drive power supply input.', 'Contact noise in the master controller (PLC).'] p. 56
- If there are no problems with the wiring and the error continues to occur, replace the option. p. 56
Before you service the product, read the safety instructions in the manual p. 16.
If bUS is still not resolved
- Contact Yaskawa or a Yaskawa representative p. 7 “ContactYaskawaoraYaskawarepresentative andprovidethemanualnumbershownonthefrontcoverto ordernewcopiesofthemanual.”
This page summarises what the manufacturer’s manual says about bUS; each statement links to the page it comes from, and quoted lines are copied word for word. It is not a substitute for the manual or for a qualified installer. ManualLib is not affiliated with YASKAWA. Found a mistake? Report an error.