Code bUS (Alarm): Option Communication Error

Code type: Alarm / minor fault Manual section: Yaskawa V1000 Troubleshooting Connection is broken or master controller stopped communicating. - Check for faulty wiring. - Correct the wiring. - Repair ground wiring or disconnected cables. Option card is damaged. If there are no problems with the wiring and the fault continues to occur, replace the option card. The option card is not properly connected to the drive. - The connector pins on the option card are not properly lined up with the connector pins on the drive. - Reinstall the option card. A data error occurred due to noise. - Check options available to minimize the effects of noise. - Take steps to counteract noise in the control circuit wiring, main circuit lines and ground wiring. - Try to reduce noise on the controller side. - Use surge absorbers on magnetic contactors or other equipment causing the disturbance. - Use cables recommended by Yaskawa, or another type of shielded line. The shield should be grounded on the controller side or on the drive input power side. - All wiring for communications devices should be separated from drive input power lines. Install an EMC noise filter to the input side of the drive input power.