Simultaneous Forward/Reverse Command or Digital Input Triggered

What does External Fault mean?

This fault can occur due to two distinct conditions: either a forward and reverse command were simultaneously active for over 500ms, indicating a control signal conflict; or an external device triggered a fault via one of the digital inputs (S1-S6), pointing to an issue in an external safety or interlock circuit. Both scenarios lead to motor stoppage and require careful investigation of control logic and external devices.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   If triggered by a digital input, identify the external device responsible for the fault and rectify the condition at its source.

2. 4

   Verify the functions assigned to the digital inputs (H1-01 to H1-06) to ensure they are configured correctly and do not conflict.

3. 5

   Reset the drive fault via the operator panel or power cycle after addressing the root cause.