The error on Yaskawa drives typically indicates a Digital Operator Communication Error , which occurs when the drive does not receive any data from the digital operator (keypad) for a specific duration. 1. Common Causes

: A more specific "Hardwire Baseblock" fault indicating the safety circuit signals are persistently inconsistent.

In some models, errors in the "H" range relate to the Safe Disable or Hardwire Baseblock (HBB) circuits. A timing lag or incorrect wiring between the /HWBB1 and /HWBB2 input signals can trigger specific H-series alarms.

If the error remains, the digital operator itself may be faulty and require replacement.