Option Communication Error

What does bUS mean?

This fault signals a critical communication failure involving an installed option card, indicating a disruption in data exchange with either the drive or an external controller. Causes range from incorrect or damaged wiring and short circuits to significant electrical interference or improper option card installation. Such a communication breakdown prevents the drive from receiving essential commands or feedback, potentially leading to unexpected stops or complete loss of control.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Assess the installation environment for sources of severe electrical interference, such as magnetic contactors or unshielded power cables, and implement mitigation strategies like shielded cables, noise filters, or surge protective devices.

2. 4

   If all previous steps fail to resolve the issue, the option card itself may be damaged and requires replacement.