Static Phase converter switch question

daryl bane · Jun 12, 2017

Did the research and can't find the answer. I have a 3/4 HP 3ph. blower motor, and a properly sized Phase a Matic static converter. Can I put a switch to turn on/off the blower motor on the L1 or L2 line feeding the converter, or does the switch have to switch both L1 and L2 together? Or should/could the switch be on the converter 3 ph. output? and which legs? Electrically clueless.

rons · Jun 13, 2017

Square D - 251�MBG2 - Non-Reversing 3-Pole NEMAType 1 6��VAC 18A Manual Motor Starter - Allied Electronics

A. Switch L1 and L2 through a manual switch like this one.

B. The converter can be left plugged in as the website says that only .008 amps are drawn when there is no load. :icon_bs:

Then you could switch all three legs leaving the converter. (I wouldn't do it their way).

C. Use a contactor with a push buttons for stop and start. Similar to method A. You could package the converter and two push button switches in a metal enclosure box with a hinged door. :drool5:

daryl bane · Jun 13, 2017

Thanks , I was hoping to get away with not having to buy an expensive switch, especially for a smallish motor that doesn't pull many amps.

atomarc · Jun 13, 2017

Daryl,

This switch isn't 'too' expensive and it will do the task you need. Technically, it has no overload protection for the motor but for a small motor such as yours in a light duty situation I think it would be perfect.

Leviton MS3�3-DS 3� Amp 6�� Volt, Three-Pole, Three Phase AC Motor Starter, Suitable as Motor Disconnect, Toggle, Industrial Grade, Non-Grounding, Black - Wall Light Switches - Amazon.com

Stuart

rons · Jun 13, 2017

daryl bane said:
Thanks , I was hoping to get away with not having to buy an expensive switch, especially for a smallish motor that doesn't pull many amps.

The one I linked to costs about $25 used. I see them all the time.

daryl bane · Jun 13, 2017

Thanks for all the replies. I don't know why I got confused about this, maybe the wine.... But a double pole toggle on L1 and L2 is probably the way to go for this application. This way the converter is not always energized, except when I flip the switch.

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Static Phase converter switch question

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