RL Controls - Industrial Electronic Drives and Automation

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KEB System

The KEB S4 servo system is obsolete with 

no direct replacement.


The S4s used on Arvor machines are not standard,

they have special firmware written by KEB France.


KEB Germany have no record or knowledge of this firmware, KEB France no longer support

this product.


RL Controls are at present trying to obtain back up for this product.


Please be aware that many different companies offer a repair service on KEB Servo / inverter products, If they overwrite your firmware we have no way of restoring it, and your drive will at present not function in your Arvor machine again.


We do hold all user codes, KEB software, and interfaces.


This page will be updated IF / when we obtain a back up service.