CCr

System failure

Lenze · SM29_05 Service Bulletin

What does CCr mean?

This fault indicates a system failure caused by strong interference injection on the control cables or ground/earth loops in the wiring. Such interference can lead to unpredictable system behavior and instability.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Check PE (Protective Earth) connection.

  2. 4

    After troubleshooting, deenergise the device completely (disconnect 24 V supply, discharge DC bus).

Source: Lenze SM29_05 Service Bulletin
Open Manual (Page 328)