Electrical requirements - circuit breakers

Ian -

Due to the filters and motors fitted to the ROTOR there is likely to be current flow to earth in the ROTOR drive system….the EMC filters and the shielding on the cables are intentionally designed to filter “noise current” down to earth. A standard RCD circuit breaker fitted in most situations may trip due to the leakage current.

The combination of EMC filters and the drive itself means that the leakage current can be just over the limit of a standard 30mA RCD circuit breaker

Added to this there is an inrush current caused by the Servo Motor Drive- Wikepedia

There are a few options…

  • Fit a device with a higher RCD trip level (sometimes insurance companies insist on 30mA so this might not be an option)
  • Fit an isolation transformer (1:1) between the supply and the machine
  • Increase to a D20 breaker with higher trip level which will cope with leakage current and inrush current.
    • make sure the cabling on the outgoing side of this is suitably sized to be protected by the breaker.

Ideally the ROTOR should be on its own circuit or separate from any other large items such as fridges etc..

 Singer Technicians involved in the installation of a ROTOR are not qualified to perform any modifications to a customers mains electrical supply and are not responsible for any delays caused to the installation while this work is carried out.


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