220 3 phase to 440 3 phase ?

[Scruffy]

I’m thinking of buying a old #5 brown and sharp surface grinder. It’s 440. I have 220 3 phase . Can you use a transformer to go to 440? If so how?
Thanks ron

 

[Ulma Doctor]

you'll use a device called a step up transformer.
like this
https://hgrinc.com/productDetail/Electrical/Used-Olsun-Electrics-Transformer/09170250013/

basically the 230v as the input, the transformer output is 460vac, 3 phase.
the transformer is being run in reverse

 

[Scruffy]

Thanks u
Ma, that’s what I thought. Hgr. Is only a couple of hours from here so won’t have to pay a bunch of shipping if I buy the sg.
Thanks ron

 

[Blackjackjacques]

you'll use a device called a step up transformer.
like this
https://hgrinc.com/productDetail/Electrical/Used-Olsun-Electrics-Transformer/09170250013/

basically the 230v as the input, the transformer output is 460vac, 3 phase.
the transformer is being run in reverse

That is a 25 kVA transformer - I guess that will supply any future needs as well

 

[Ulma Doctor]

the 25kVA is overkill, but the price is right!

 

[Blackjackjacques]

the 25kVA is overkill, but the price is right!

Can't argue with that!

 

[dwilliams35]

It's often easier to convert the motors to 240v 3 phase than to get a transformer. Normally it's just rewiring the motor, and either reconfiguring or changing out a much-cheaper control transformer.

 

[Blackjackjacques]

It's often easier to convert the motors to 240v 3 phase than to get a transformer. Normally it's just rewiring the motor, and either reconfiguring or changing out a much-cheaper control transformer.

I agree - if the motor windings permit re-configuration - then it is a piece of cake. Changing out a control transformer is also simple enough -if applicable.

 

[Ulma Doctor]

A dual voltage motor is the prerequisite, otherwise the transformer may be the least expensive route

 

[1holla]

Check the specification plate on the motor. If 220/440V or 230/460 is given, just rewire the motor from star to delta connection. Check for control supply voltage also. On the terminalboard you will find 6 bolts ( 3 rows with 2 bolts), all connectet to the motor windings; 1 of each row to the supply. If 3 bolts of a line are connectet to the supply and the opposite 3 bolts are jumpered in line, that wiring is called star; if always 2 bolts of a row are jumpered and at the same time connectet to the supply it is a delta connection. That means a star connection is used for higer voltage and a delta connection for lower voltage. Do not touch the origin wiring of the motor windings.