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What causes an internal error 29 (INFT) fault in an Altivar Process Drive?

Published date: 21 June 2019

How can I troubleshoot an Internal Error 29 in a Process Drive? 

Product Line:
Altivar 6xx and Altivar 9xx Process Drives 


Causes and Remedies


Principle:  MCE inverter brick internal Fault

Probable cause:    
  • interrupted communication between the CMP6 (Power baord) and the CMI1 (Inverter brick) during run mode
  • CPLD internal communication error

  • check the high speed link communnication cable between the Inverter brick and the power board.
  • check with SoMove service section the PBM1 fault register for deeper analysis.
  • change the power board
  • change the inverter brick.

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