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#164136 05/25/07 11:11 PM
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u2slow Offline OP
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I looked at an automotive shop job today. Only this evening did I realize that the single-phase compressor (7.5hp) and the TIG machine want *230V*. blush The service is 120/208V 3-phase.

I know most of the options (I think)... what are the least expensive workarounds for this? Or what is the typical fix?

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For the compressor buck boost transformer.Does the TIG welder have taps to change voltage,as a lot of welding equipment is designed for multi voltage use,just change tap to desired voltage.

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Just a thought, it might be cheaper and or better to replace the TIG welder with a 3-phase 208 version, if the existing one doesn't have a 208 tap.

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u2slow Offline OP
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I have to double check... it all just dawned on me this evening. The welder is a Miller Maxstar 150. Judging from the online owner's manual it appears to auto-sense between 115 and 230V.

OTOH, the mig machine has both a 200V and 230V rating, so its fine.

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As NORCAL suggeste, Buck & Boost X-frmr.
and check the tabs on the welder.

http://acmepowerdist.com/products.asp?PAGE=/selguide/index.aspx

Use the selection guide on the left.




Be kind to your neighbor, he knows where you live

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Here is a link from Miller: http://www.millerwelds.com/products/tig/maxstar_150_sth/ This is one of 2 Maxstar models listed but this is copy and paste from same link:"Auto-Line™ Power Management technology circuitry automatically connects to 115 - 230 VAC, single-phase power without removing the cover to relink the power source."I did not read anything stating a 208V rating all data refered to operating @ 115 or 230V .


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u2slow Offline OP
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I'll give Miller's tech line a call on Monday. One local retailer said 208V is fine. Not that I'm going to take their word for it crazy

Based on the price for a 208/230V-20A buck/boost for the welder ($600 eek) I predict it will be cheaper to change the motor on the compressor if Devair says no-go.

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From the miller web:

Auto line power management tecnoligy circuitry automatically connects to 115 - 230 VAC, single-phase power without removing the cover to relink the power source.


Wonder what type of plug it has.

This tig is a newer type that only weighs 13 pounds and my guess is more capacitors and electronics then transformers.
Other miller units had:
Universal Location Flexibility
Permits direct connection to almost any type of input power—115-575 VAC (varies by product), 1- or 3-phase, 50 or 60 Hz

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"Wonder what type of plug it has."

You install your own......

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I think the Multi-Voltage Plug(tm) setup on this one is rather innovative:

http://www.millerwelds.com/products/mig/millermatic_passport/index.php

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