Help w/selecting Buck & Boost Transformer (208VAC-230VAC)?

On Mon, 29 Dec 2003 18:28:57 -0400, RTH wrote
(in message <[email protected]>):

> Need to know what your amp load is a 230V in order to size the BB properly.
>
> RT


The motor is rated at 22FLA. Is this the figure that's needed?
I do not know starting amperage if the motor, though if needed I could get
that info.
This motor will be the only load on this circuit.



--
Swap out the air for lovegasoline to make contact.

On Tue, 30 Dec 2003 1:26:55 -0400, Dennis J Brown wrote
(in message <z08Ib.10784$xX.33391@attbi_s02>):

> I have one that they were throwing away at work. It is still on my bench I
> will look and see what the rating is when I go back in Monday.
>

Thanks Dennis.
-----

Swap out the air for lovegasoline to make contact.

On Mon, 29 Dec 2003 22:20:42 -0400, RTH wrote
(in message <[email protected]>):

> Don't think .050 kva is going to be big enough. Acme does not list
> selection
> tables on it's website. I checked another manf. Hevi-Duty Elec and there bb
> tables indicate that you need a .750 kva to boost 208 to 229 and will handle
> 31.8 amps.
> A .500 va will handle about 20 amps.


I called SQUARE-D and was told .75 KVA was correct for my application.

Another question is whether to use a 12/24 volts secondary or 16/32 volts
secondary. The gent at Square D claims that the 12/24 will give 230VAC
output; the 16/32 will yield 236VAC output....these figures assuming
consistant 208VAC input voltgae. He also said that although the motor is
listed at 230VAC, the specs for motors have a wider voltage tolerance (I
think he said it was 15% above & 10% below the listed voltatge). He felt that
either Booster would work (the 16/32 however would then be rated at .50KVA
for my application instead of the .75KVA rating of the 12/24).
Anybody see any great advantage of the one over the other (I may possibly be
able to get a 16/32 cheaper)?

On installation: does the Booster get installed downstream of the disconnect
box (service panel-booster-disconnect box-motor)?
Any other hardware needed to complete a booster circuit or is it pretty much
just the Booster transformer wired into the circuit?
Thanks again.
Neal

--
Swap out the air for lovegasoline to make contact.

Need to know what your amp load is a 230V in order to size the BB properly.

RT

"-N." wrote:

> I wish to purchase the transformer to run a 230VAC single phase compressor
> motor on 208VAC service.
>
> During the course of a previous thread it was determined that my electrical
> service consists of 2 phases of a 3-phase 240V feed. Hot-to-hot voltage I am
> getting at my breaker panel is 208VAC. This is all USA 60hz.
> I'm not familiar with specifications for transformers, so I would appreciate
> some assistance in determining the specs for the purchase of a Buck-Boost
> transformer, so I can run the compressor without burning up the motor.
>
> I've found a surplus Buck-Boost transformer with these specs:
> ACME brand,Catalog #: T-1-81047, Style: ER, Primary Volts: 120 x 240,
> Secondary Volts: 12 x 24, Single Phase, .050 KVA, 50/60 Hz, Winding Rise 80,
> Degree C. Enclosure type: 3R Outdoor, Insulation System: B-3223-M Class 130
>
> Would that suit my application?
> If not, what specs do I need to correctly and safely boost my service to
> 230VAC?
> Once again, many thaks for the assistance!
> Neal
> --
> Swap out the air for lovegasoline to make contact.

Don't think .050 kva is going to be big enough. Acme does not list selection
tables on it's website. I checked another manf. Hevi-Duty Elec and there bb
tables indicate that you need a .750 kva to boost 208 to 229 and will handle
31.8 amps.
A .500 va will handle about 20 amps.

Suggest you try contacting a local Electrical Dist like Graybar Elec Supply or
may WW Grangier for more info. They probably have what you need in stock.

RT

"-N." wrote:

> On Mon, 29 Dec 2003 18:28:57 -0400, RTH wrote
> (in message <[email protected]>):
>
> > Need to know what your amp load is a 230V in order to size the BB properly.
> >
> > RT
>
> The motor is rated at 22FLA. Is this the figure that's needed?
> I do not know starting amperage if the motor, though if needed I could get
> that info.
> This motor will be the only load on this circuit.
>
>
> --
> Swap out the air for lovegasoline to make contact.

I see that the compressor cut-off is 170 in your latest post. That's a nice
air supply if you have a demand for that much air.

I think the current drawn by the motor will be it's highest at 170. Instead
of getting a transformer, I'd just reset the pressure switch cut-off for to
about 140, and lower the cut-in a little.Another approach would be to reduce
the size of the motor pulley, but resetting the pressures would be easier.

If you had high air demands, this wouldn't be a practical approach, but in a
home shop, it shouldn't matter much. If you're using a lot of air on a daily
basis, it will be more costly to operate the unit this way, with an increase
in the amount of times the motor cycles on.

I don't know if the starter has a motor current protection trip in it, but
you might want to check for that. If the unit has motor thermal protection
plus current protection (that are operating properly), it's unlikely that
you'll burn out the motor.

WB
..............

"-N." <[email protected]> wrote in message
news:[email protected]...
> I wish to purchase the transformer to run a 230VAC single phase compressor
> motor on 208VAC service.
>
> During the course of a previous thread it was determined that my
electrical
> service consists of 2 phases of a 3-phase 240V feed. Hot-to-hot voltage I
am
> getting at my breaker panel is 208VAC. This is all USA 60hz.
> I'm not familiar with specifications for transformers, so I would
appreciate
> some assistance in determining the specs for the purchase of a Buck-Boost
> transformer, so I can run the compressor without burning up the motor.
>
> I've found a surplus Buck-Boost transformer with these specs:
> ACME brand,Catalog #: T-1-81047, Style: ER, Primary Volts: 120 x 240,
> Secondary Volts: 12 x 24, Single Phase, .050 KVA, 50/60 Hz, Winding Rise
80,
> Degree C. Enclosure type: 3R Outdoor, Insulation System: B-3223-M Class
130
>
> Would that suit my application?
> If not, what specs do I need to correctly and safely boost my service to
> 230VAC?
> Once again, many thaks for the assistance!
> Neal
> --
> Swap out the air for lovegasoline to make contact.
>

RE: Subject

Go to any decent industrial electrical distributor.

Selecting a B/B x'fmr is a very straight forward thing.

All the x'fmr manufacturers publish selection tables.

All you need is input voltage, output voltage, and motor HP.

HTH


--
Lew

S/A: Challenge, The Bullet Proof Boat, (Under Construction in the Southland)
Visit: <http://home.earthlink.net/~lewhodgett> for Pictures

I have one that they were throwing away at work. It is still on my bench I
will look and see what the rating is when I go back in Monday.

Dennis
"-N." <[email protected]> wrote in message
news:[email protected]...
> I wish to purchase the transformer to run a 230VAC single phase compressor
> motor on 208VAC service.
>
> During the course of a previous thread it was determined that my
electrical
> service consists of 2 phases of a 3-phase 240V feed. Hot-to-hot voltage I
am
> getting at my breaker panel is 208VAC. This is all USA 60hz.
> I'm not familiar with specifications for transformers, so I would
appreciate
> some assistance in determining the specs for the purchase of a Buck-Boost
> transformer, so I can run the compressor without burning up the motor.
>
> I've found a surplus Buck-Boost transformer with these specs:
> ACME brand,Catalog #: T-1-81047, Style: ER, Primary Volts: 120 x 240,
> Secondary Volts: 12 x 24, Single Phase, .050 KVA, 50/60 Hz, Winding Rise
80,
> Degree C. Enclosure type: 3R Outdoor, Insulation System: B-3223-M Class
130
>
> Would that suit my application?
> If not, what specs do I need to correctly and safely boost my service to
> 230VAC?
> Once again, many thaks for the assistance!
> Neal
> --
> Swap out the air for lovegasoline to make contact.
>