3 phase motor wiring

Adam Bailey · Oct 2, 2017

Hi just after some advice on how to wire this water motor. I have follwed the wiring diagram, when I test it, just get a buzz from the motor, Not spinning at all. Tried switching line conductors, same result.

Supply is 3 phase & Neutral.

Thanks

[ElectriciansForums.net] 3 phase motor wiring

Pete999 · Oct 2, 2017

My guess is that you have wired it up incorrectly at the starter terminal block top set of connections, and the motor is trying to start on 2 phases.

telectrix · Oct 2, 2017

diss. the control circuit cables. then try pressing the contactor in manually. if it fires up then, you have a control circuit fault/incorrect wiring/incorrect coil volts.

Deleted member 72666 · Oct 2, 2017

You have misaligned phases in the contactor with L3 in the aux terminal (n/o)

Adam Bailey · Oct 2, 2017

Changed over to pic below, motor spun up a a second, then buzz’s

Adam Bailey · Oct 2, 2017

Now running, nuetral in wrong terminal,

Thanks

Pete999 · Oct 2, 2017

Adam Bailey said:
Now running, nuetral in wrong terminal,

Thanks

No N required for that particular motor, the blue N conductor is cut and left not terminated at the motor terminal block

Deleted member 72666 · Oct 2, 2017

Neutral is needed for the control cct.

Pete999 · Oct 2, 2017

Pete999 said:
No N required for that particular motor

stantheman said:
Neutral is needed for the control cct.

What's is the Blue conductor doing left floating in the Motor terminal box, and connected @ the contactor? I agree if the coil is @230 v then a N is required.

Deleted member 72666 · Oct 2, 2017

The blue is left floating in the contactor enclosure also, the only blue cable used is from the swa (3ph&n) which happens to be the neutral for the coil cct.

Lucien Nunes · Oct 2, 2017

When a motor won't run, always worth checking that all phases are present i.e. 400V between them and 230V to N or E, before anything else. Would have picked up the starter wiring error instantly. If all OK, then usually it's a miswire of the motor leadouts.

Marvo · Oct 2, 2017

You may have already damaged the motor windings by running it on 2 phases, disconnect the cable and test the motor windings for continuity resistance and IR @ 500v.

What is the rated run current on the motor info plate? 9 Amps setting on the thermal overload looks high for that motor but sometimes photos are decieving.

ipf · Oct 2, 2017

Sounds like a suck it and see scenario, to me.
Messing about with 3 phase motor supply and control can be very dangerous without the necessary experience.
If you're qualified, you're misreading a very basic situation.
If not, you shouldn't be touching this.

3 phase motor wiring

Adam Bailey

-

Pete999

-

telectrix

-

Deleted member 72666

-

Adam Bailey

-

Adam Bailey

-

Pete999

-

Deleted member 72666

-

Pete999

-

Deleted member 72666

-

Lucien Nunes

-

Marvo

-

ipf

-

News and Offers from Sponsors

Similar threads

OFFICIAL SPONSORS

YOUR Unread Posts