VSD! Please any advice/info Appreciated

**Danny** · 14th March 2013, 08:35 PM

Hey guys,

Firstly, I wasn't sure exactly what category to put this post in so apologies if I'm off with that.

Basically, VSDs, I know nothing about them and did not even know such a thing existed until I posted my last post about some newly aquired 3PH machinery.

So in a nutshell, I would like to keep my 3PH, 5hp 20" thicknesser but I do not have 3 phase installed. So, do I simply need to purchase the appropriate VSD and have that installed in my workshop and away I go with my 3PH thicknesser? I can't stress enough how little I know about the electrical side of things so if someone can put in very simple terms exactly what I would need to get my thicknesser up and running for certain, then that would be greatly appreciated.

This is some info I received from ASA Industries in Melbourne who these this stuff online:

You may need a 4kw or a 5.5 kw vsd. But first, you be sure of the motor specs of your machine let me know if;
- Is your motor 415 v star (Y) connected?
- if yes, can it be reconfigured to Delta (triangle)?
The above two type connections can be seen in following picture.

Or send me a photo of your motor connection as well as a photo if the name plate.

This is all double dutch to me!! Please Help..

Thanks guys

**RustyArc** · 14th March 2013, 09:25 PM

If you only have a single phase 240v supply, then in order to run a 3ph motor off a VSD (or VFD as they are often called) that is expecting 415v, it needs to be re-wired from star to delta.

The way to tell this is to pop open the terminal cover on the motor and see if it has 6 terminals, and possibly a wiring diagram showing both connection setups.

The other thing to consider is that you'll need a fairly hefty circuit for a 4kW motor, ie. 20 amps, so you need to check that amount of current is available in your shed - something probably only a sparky can confirm, and it'll require its own circuit.

**Stustoys** · 14th March 2013, 10:15 PM

Hi Danny,

First question. I assume nothing less than 5hp is going to suit you?(would 3hp do?)

Is there a plate on the motor you can get a picture of?

Stuart

**Danny** · 15th March 2013, 06:19 PM

Hey guys,

Stuart, a 3hp would be ok however, I really would love to go with the 5! be great to be able to usilise that kind of power. I can get a picture of the motor..

**RustyArc** · 15th March 2013, 07:48 PM

If the motor you have is 5hp, and, as mentioned, you have the mains wiring to support it, I can't see why you wouldn't use it.

As mentioned, a photo of the name plate and a photo of the terminal box with the cover off will go a long way towards telling you if you can use a 240V VSD on the motor or not.

**Danny** · 17th March 2013, 06:24 PM

Originally Posted by RustyArc

If the motor you have is 5hp, and, as mentioned, you have the mains wiring to support it, I can't see why you wouldn't use it.

As mentioned, a photo of the name plate and a photo of the terminal box with the cover off will go a long way towards telling you if you can use a 240V VSD on the motor or not.

No problem, I'm on that..

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