PowerLogic T300 - On SC150 module, how to use SF6 loss interlock to prevent MV switch operation?

[med]

The SC150 module is used to control a motorized SF6 MV switch fitted with an auxiliary contact that will close in case of an SF6 loss (in a normal situation, this auxiliary switch is open).

How can I set the interlock in CoreDB to prevent the SC150 from operating (open or close) the MV switch in case of SF6 loss (auxiliary contact CLOSED), and only authorize it in case this auxiliary contact is OPEN?

[TomBerry]

Answer #1     Built-in functionality for the SC150

If each switch has its own SF6 level indication (e.g. for switch boards)

Connect the SF6 indication to digital input 5 of the SC150.
On the Settings, Switch Control page, Tab: Interlocking

Set the options on how this input should affect the open and close commands
Options are

   None = not blocked (DI state is ignored),

   Block if true (auxiliary contact is closed),

   Block if false (auxiliary contact is open)

See the user manual pp202-203 Interlock Function on SC150 Module.

If one gas low indication is used for many switches, e.g. for some types of ring main unit, then this needs a modification in CoreDB.

I'll describe this in another reply.