4 or 5 pin plugs for 3 phase supply from inverter?

pgrbff · Dec 22, 2020

I have recently bought a 3 phase bandsaw for hobby use and acquired a single phase to 3 phase inverter to power it.
When I looked at buying cable and plugs/sockets for the supply I didn't know if I should choose 3P + earth or 3P N + earth plugs and sockets.
What is the difference and which should I buy?

Mike Johnson · Dec 22, 2020

How many pins on the bandsaw socket, this will indicate what you need to plug in that end and how many cores the cable should have.

pgrbff · Dec 22, 2020

Its a 60 year old dual voltage. 3 plus earth is all the bandsaw needs. I'm just curious as to why the neutral and if the 3P N and earth is just the lastest version?

James · Dec 22, 2020

You need a 3 pin socket because your supply is single phase.

Then you will need to rewire the saw to include the inverter and remove the original 400v contactors.

Also change the motor configuration from star to delta, assuming it is a dual voltage motor (400 star, 220 delta)

pgrbff · Dec 22, 2020

The plate says 260V 5A in delta. I assume 1.5mm is sufficient? Any reason to use 2.5mm?

Mike Johnson · Dec 22, 2020

5A in delta, sure there is not a 1 missing off the front of that, it's a very low power for a Bandsaw.

James · Dec 22, 2020

That’s 5A per phase. So 1.5 from inverter to motor is ok but inverter needs to have 15 to 20A supply. What spec is the inverter?

pgrbff · Dec 22, 2020

Mike Johnson said:
5A in delta, sure there is not a 1 missing off the front of that, it's a very low power for a

pgrbff · Dec 22, 2020

James said:
That’s 5A per phase. So 1.5 from inverter to motor is ok but inverter needs to have 15 to 20A supply. What spec is the inverter?

Input Current: 18.1A/13.5A
Input Voltage: 200V-240V Single or Three Phase ±10% at 50-60Hz ±5%

James · Dec 22, 2020

Do you have anyone experienced in 3 phase control and/or any electrician to wire this up to your house?

there are plenty of places where this could go wrong if not thought out and designed correctly.

some might be an inconvenience, others could be a danger.

ipf · Dec 22, 2020

I can smell a bit of 'boom boom' in the air.?

pc1966 · Dec 22, 2020

Unless absolutely necessary get a 5-pin socket and make sure the neutral is connected.

If you have a delta-style load (only using L1-L3, like your motor above) you can ignore the N, whereas if you don't have the N connection for any star-style load in the future (L1-L3 & N) it is going to end very badly for something, or someone!

pgrbff · Dec 23, 2020

ipf said:
I can smell a bit of 'boom boom' in the air.?

Uncalled for.

pgrbff · Dec 23, 2020

I have no problems wiring the inverter but I have never used 3 phase.
This is the junction box on the saw and how I believe it should be re-wired. But I am confused about the neutral?
I can buy 4 pin or 5 pin ind plugs/sockets and I just really wanted to know which I should use and why.

James · Dec 23, 2020

A 3 phase motor has no neutral connection
As said before, the socket on your wall needs to be 3 pin as it is single phase.
The inverter to motor cables should be part of the machine wiring and not require a plug and socket.

4 or 5 pin plugs for 3 phase supply from inverter?

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