Can we use MX continuous Shunt trip to open/Trip NSX MCCB on Schneider ATS with UA controller & IVE ?


15 September 2022

If the shunt signal is continuous, it can keep breaker in trip position, but UA controller will keep trying to close the breaker. Unfortunately, this is not recommended.

If you activate permanently the MX on the breaker which should be closed, the UA controller keeps on sending a permanent closing order to the breaker. As a result, the Motor will try to charge the breaker every second when the MX is activated. It will damage the Motor Mechanism if those charging cycles last several ten seconds. As soon as the MX command is removed, the breaker will close normally.
The ATS is not really designed to mix automatic orders coming from UA controller and manual one coming from MX.