Dairy electrics advice

[Demolition Man]

Installing a vacum pump with an NFO drive and VPC. My electrician is wiring everything up but is confused as to what the motor protection in the diagram attached needs to be. The dairy engineer told him its a contactor below the NFO bypass switch but the diagram says fuse protection at 4.6 Amp. Can anybody enlighten me as to what the area circled blue represents?

 

[TomB]

I’m no sparky but a starter with overloads set at 4.5amps.?

 

[Demolition Man]

I’m no sparky but a starter with overloads set at 4.5amps.?

Exactly, says 4,6 Amp circled in blue on the drawing yet main breaker slow release 25Amp . A call to DeLaval is in order, just have to wait until Monday.

 

[William james]

What size of motor is it? It will be 4.6 Amps per phase.

 

[William james]

Sorry when I looked diagram seen it must be a 2.2kw motor

 

[Demolition Man]

Have figured it out now . Switch over top and bottom (isolate supply from NFO. Starter and fuse at 4-6Amp per phase with thermal overload protection between the switches. Hopefully this 2.2kw starter below will do the job.

 

[William james]

What pump is it? A dvp1200 or you retro fitting the variable speed on to a non Delaval pump