Why do the main circuit breakers trip when the ROTOR is turned on?

Answer : 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. Therefore a standard RCD circuit breaker may trip due to the leakage current.

Note: This article only applies to ROTOR HDA's supplied before July 2021

 What model of ROTOR do I have - ROTOR / ROTOR+?

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

There is also an inrush current caused by the Servo Motor Drive- Wikepedia

Solution

There are a few options to resolve this: 

• Fit a device with a higher RCD trip level - sometimes insurance companies insist on 30mA so this may not be an option. Please check with the local electrical services department.
• Fit an isolation transformer (1:1) between the supply and the machine
• Increase to a D20 breaker with a higher trip level which will cope with leakage current and inrush current.
  • Cabling on the outgoing side of this should be 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..

Note : Singer Engineers involved in the installation of a ROTOR are not qualified to perform any modifications to a customer's mains electrical supply and are not responsible for any delays caused to the installation while this work is carried out.

If you require more information please contact [e-mail] for assistance.