SI-B Communication Error

What does BUS mean?

This fault occurs when using the SI-B or CP-916 communication options if communication is lost after being established. It signifies a disruption in communication with the option card, which can halt control functions or data exchange, leading to operational stoppage and loss of control.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure the SI-B or CP-916 option card is correctly seated in its slot within the inverter.

2. 4

   Inspect for external electrical noise or interference that could disrupt communication.

3. 5

   If the fault persists, consider replacing the communication option card or testing with a different external device.