3 to 1 phase air compressor conversion, coil in magnetic switch question

[arieck]

Hi all, I've been researching and putting components together to change a three phase air compressor over to 1 phase.

Plan: I've purchased a 1 phase, 5HP compressor duty motor, 23-21 FLA rating.

Now, the compressor came with a mag starter and overloads that are obviously too small for the amp load. Accordingly, I've been researching and looking for appropriate contactors and overloads that will handle it.

I have found a couple of candidates that seem like they would work per their listed ratings, but I'm confused about coil voltage. I plan to hook the motor up to the 220 shop feed through one of these replacement contactor and overload sets, but I read some where that the coil must match the supply. The ones I like seem to have 110~120 VAC coil rating, and would be preferable because they are cheaper. Is one able to just supply a seperate 110 lead to the contactor's aux relay, which then activates the main 220 contacts?

http://www.ebay.com/itm/ABB-A26-30-10-CONTACTOR-WITH-ABB-TA25-DU-OVERLOAD-RELAY-TRIP-CLASS-10A-/160801788096?pt=LH_DefaultDomain_0&hash=item25708890c0

Or should I go with a heavier unit like this (one that has a 100~240VAC coil rating)

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=170742745075&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

Thanks so much, I appreciate it and can't wait to get this up and running!

Thanks
Adam

 

[awdblazer]

yes your coil will only be 120 just take a hot and a neutral to the coil

 

[A_Pmech]

Either run a neutral to the starter or use a control transformer.

 

[Charles (in GA)]

Magnetic starters tend to be "modular" in that you can build up what you need. Coils for a given unit are available in a variety of different voltages and really should not vary in cost noticeably. You select the heater for overload based on the motor amps you are using. If you are using a 240V motor, I would use a 240v coil and not bother with running a neutral to the compressor, just that much more work and expense.

Charles

 

[arieck]

Thanks so much for the help. Now I can move forward, but before I haul off and purchase a new starter, overloads, enclosures, etc., I just want to make sure I can't just by uprated heaters like (http://www.ebay.com/itm/Toshiba-Overload-Relay-R-35E-/270987668548?pt=LH_DefaultDomain_0&hash=item3f181fac44)and plug them into my existing starters. In my research, I've come across several people who have mentioned approaching it this way. What would the effect be? My mag starter specs are below :

 

[Norcal]

The links posted are of a IEC style starter & a contactor, & the last one is also a IEC type starter, IEC type have adjustable overload relays, which means no heater coils but one must make sure the O/L relay has the adjustment range that fits the motor one is planning to use. A NEMA style is a better/ more rugged device, but if you buy a obsolete starter it can cost $$$ to get parts, this applies to IEC or NEMA starters.