I have no affiliation with this seller, other than I just bought an
identical brand new pump from him. It seems to work spectacularly.
It's a 1/3 HP Gast 72R rocking-piston pump that can suck about 28" Hg.
I'm pretty sure he's selling it so cheaply ($50 brand new out of the
box, buy-it-now) because it's listed for use at 220-240VAC 50 Hz
(European standard). Nowhere on the label or in any of the manuals
does it say it can be used at 60 Hz, as would be standard in the US.
Nevertheless, given that Gast sells a variant that runs at 115VAC/60 Hz
which runs at 20% higher RPMs (go figure), I took a chance and bet that
the motor doesn't really mind running at 60 Hz. I'd even go so far as
to venture that it's the same exact motor, just wired for the higher
voltage. At any rate, I got it, wired it up with a NEMA 6-15 plug,
hooked up the starting capacitor (included), and stuck it in one of my
220V wall sockets. It totally sucks! And I mean that in the good way.
I stuck a vacuum gauge on it, hooked it up to my veneer bag, and it
sucked it down to 26" Hg in about 20 seconds.
Anyway, I see that he's selling another one. It's a GREAT deal for
this pump. I saw the same model (albeit the 115V version) for sale new
from a store that sells equipment for pond aeration. They were asking
almost $600.
Here's the link:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9519515004&ssPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT
Josh
"RicodJour" <[email protected]> wrote in message >
> http://cgi.ebay.com/750-W-Watt-Voltage-Transformer-Converter-Step-Up-Down_W0QQitemZ9722978992
> and I'm sure you could do better than that.
>
> R
That's a voltage transformer. If I understand correctly, what they're
looking for is a frequency converter to convert 60 Hz to 50 Hz.
todd
At 600 watts or so, probably quite a bit.
At any rate (or frequency, as the case may be), it continues to work
just fine for me. I veneered my first two panels this afternoon.
Josh
Preston Andreas wrote:
> I looked at it and it looks like a great price. However, after doing a
> little research such as line voltage to frequency ratios, it seems that
> running it on straight 60hz will lead to premature failure. Also, on the
> Gast discussion forum, it is recommended that you only run it with a 50hz
> converter. Check out
> http://www.gastmfg.com/discus/messages/23/80.html?MondayJanuary2220011124am
>
> My question is, how much would a converter cost to handle this pump?
>
> Preston
> "Josh" <[email protected]> wrote in message
> news:[email protected]...
> >I have no affiliation with this seller, other than I just bought an
> > identical brand new pump from him. It seems to work spectacularly.
> > It's a 1/3 HP Gast 72R rocking-piston pump that can suck about 28" Hg.
> >
> >
> > I'm pretty sure he's selling it so cheaply ($50 brand new out of the
> > box, buy-it-now) because it's listed for use at 220-240VAC 50 Hz
> > (European standard). Nowhere on the label or in any of the manuals
> > does it say it can be used at 60 Hz, as would be standard in the US.
> > Nevertheless, given that Gast sells a variant that runs at 115VAC/60 Hz
> > which runs at 20% higher RPMs (go figure), I took a chance and bet that
> > the motor doesn't really mind running at 60 Hz. I'd even go so far as
> > to venture that it's the same exact motor, just wired for the higher
> > voltage. At any rate, I got it, wired it up with a NEMA 6-15 plug,
> > hooked up the starting capacitor (included), and stuck it in one of my
> > 220V wall sockets. It totally sucks! And I mean that in the good way.
> >
> >
> > I stuck a vacuum gauge on it, hooked it up to my veneer bag, and it
> > sucked it down to 26" Hg in about 20 seconds.
> >
> > Anyway, I see that he's selling another one. It's a GREAT deal for
> > this pump. I saw the same model (albeit the 115V version) for sale new
> > from a store that sells equipment for pond aeration. They were asking
> > almost $600.
> >
> > Here's the link:
> >
> > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9519515004&ssPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT
> >
> > Josh
> >
Josh wrote:
> At 600 watts or so, probably quite a bit.
>
> At any rate (or frequency, as the case may be), it continues to work
> just fine for me. I veneered my first two panels this afternoon.
>
> Josh
>
>
> Preston Andreas wrote:
> > I looked at it and it looks like a great price. However, after doing a
> > little research such as line voltage to frequency ratios, it seems that
> > running it on straight 60hz will lead to premature failure. Also, on the
> > Gast discussion forum, it is recommended that you only run it with a 50hz
> > converter. Check out
> > http://www.gastmfg.com/discus/messages/23/80.html?MondayJanuary2220011124am
> >
> > My question is, how much would a converter cost to handle this pump?
> >
> > Preston
> > "Josh" <[email protected]> wrote in message
> > news:[email protected]...
> > >I have no affiliation with this seller, other than I just bought an
> > > identical brand new pump from him. It seems to work spectacularly.
> > > It's a 1/3 HP Gast 72R rocking-piston pump that can suck about 28" Hg.
> > >
> > >
> > > I'm pretty sure he's selling it so cheaply ($50 brand new out of the
> > > box, buy-it-now) because it's listed for use at 220-240VAC 50 Hz
> > > (European standard). Nowhere on the label or in any of the manuals
> > > does it say it can be used at 60 Hz, as would be standard in the US.
> > > Nevertheless, given that Gast sells a variant that runs at 115VAC/60 Hz
> > > which runs at 20% higher RPMs (go figure), I took a chance and bet that
> > > the motor doesn't really mind running at 60 Hz. I'd even go so far as
> > > to venture that it's the same exact motor, just wired for the higher
> > > voltage. At any rate, I got it, wired it up with a NEMA 6-15 plug,
> > > hooked up the starting capacitor (included), and stuck it in one of my
> > > 220V wall sockets. It totally sucks! And I mean that in the good way.
> > >
> > >
> > > I stuck a vacuum gauge on it, hooked it up to my veneer bag, and it
> > > sucked it down to 26" Hg in about 20 seconds.
> > >
> > > Anyway, I see that he's selling another one. It's a GREAT deal for
> > > this pump. I saw the same model (albeit the 115V version) for sale new
> > > from a store that sells equipment for pond aeration. They were asking
> > > almost $600.
> > >
> > > Here's the link:
> > >
> > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9519515004&ssPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT
> > >
> > > Josh
http://cgi.ebay.com/750-W-Watt-Voltage-Transformer-Converter-Step-Up-Down_W0QQitemZ9722978992
and I'm sure you could do better than that.
R
Stepping the voltage is easy. It's just a transformer. It's the
frequency that's difficult.
First you need to rectify the power to DC, then "invert" it to 50 Hz
AC, and finally step it up to 220V.
I think you can buy European-standard uninterruptible power supplies
like you'd use on a computer, which would output the correct frequency,
but it may have to be fairly high-end if it has to accept 115V60Hz as
an input.
Josh
RicodJour wrote:
> Josh wrote:
> > At 600 watts or so, probably quite a bit.
> >
> > At any rate (or frequency, as the case may be), it continues to work
> > just fine for me. I veneered my first two panels this afternoon.
> >
> > Josh
> >
> >
> > Preston Andreas wrote:
> > > I looked at it and it looks like a great price. However, after doing a
> > > little research such as line voltage to frequency ratios, it seems that
> > > running it on straight 60hz will lead to premature failure. Also, on the
> > > Gast discussion forum, it is recommended that you only run it with a 50hz
> > > converter. Check out
> > > http://www.gastmfg.com/discus/messages/23/80.html?MondayJanuary2220011124am
> > >
> > > My question is, how much would a converter cost to handle this pump?
> > >
> > > Preston
> > > "Josh" <[email protected]> wrote in message
> > > news:[email protected]...
> > > >I have no affiliation with this seller, other than I just bought an
> > > > identical brand new pump from him. It seems to work spectacularly.
> > > > It's a 1/3 HP Gast 72R rocking-piston pump that can suck about 28" Hg.
> > > >
> > > >
> > > > I'm pretty sure he's selling it so cheaply ($50 brand new out of the
> > > > box, buy-it-now) because it's listed for use at 220-240VAC 50 Hz
> > > > (European standard). Nowhere on the label or in any of the manuals
> > > > does it say it can be used at 60 Hz, as would be standard in the US.
> > > > Nevertheless, given that Gast sells a variant that runs at 115VAC/60 Hz
> > > > which runs at 20% higher RPMs (go figure), I took a chance and bet that
> > > > the motor doesn't really mind running at 60 Hz. I'd even go so far as
> > > > to venture that it's the same exact motor, just wired for the higher
> > > > voltage. At any rate, I got it, wired it up with a NEMA 6-15 plug,
> > > > hooked up the starting capacitor (included), and stuck it in one of my
> > > > 220V wall sockets. It totally sucks! And I mean that in the good way.
> > > >
> > > >
> > > > I stuck a vacuum gauge on it, hooked it up to my veneer bag, and it
> > > > sucked it down to 26" Hg in about 20 seconds.
> > > >
> > > > Anyway, I see that he's selling another one. It's a GREAT deal for
> > > > this pump. I saw the same model (albeit the 115V version) for sale new
> > > > from a store that sells equipment for pond aeration. They were asking
> > > > almost $600.
> > > >
> > > > Here's the link:
> > > >
> > > > http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9519515004&ssPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT
> > > >
> > > > Josh
>
> http://cgi.ebay.com/750-W-Watt-Voltage-Transformer-Converter-Step-Up-Down_W0QQitemZ9722978992
> and I'm sure you could do better than that.
>
> R
Hambone Slim wrote:
> "todd" wrote...
>
> > That's a voltage transformer. If I understand correctly, what they're
> > looking for is a frequency converter to convert 60 Hz to 50 Hz.
>
> Actually, that shouldn't be neccesary. 50Hz motors are slightly less
> efficient than 60Hz motors, so they have a little more copper and iron
> inside. So a 50Hz motor will be a little heavier than a similar rated 60Hz
> motor, but efficiency and heat transfer will be fine when run at 60Hz. It
> will however run 120% faster.
>
> The opposite isn't true, however. Running a 60Hz motor at 50Hz isn't a good
> idea: it will be underpowered, and may not come up to speed enough to trip
> off the starter circuit, if present.
Sorry I wasn't clear with that link. I don't believe you need to
change the frequency. As I understand it, it's like you said, you can
run a 50 Hz motor at 60 Hz, but not the other way around. There's also
the application. This is for a woodworking vacuum veneering
application where the pump would be running for a short time (assuming
it's set up with a vacuum controller, which it should be). It's not
continuous operation.
Will not changing the frequency shorten the life of the pump?
Probably, but as the pumps Josh pointed out are rated for something
like ten or twenty thousand hours, even a reduction factor of ten would
be acceptable for all but fairly serious commercial applications. At a
price of fifty, or seventy five bucks with shipping, that's hardly a
problem.
R
I looked at it and it looks like a great price. However, after doing a
little research such as line voltage to frequency ratios, it seems that
running it on straight 60hz will lead to premature failure. Also, on the
Gast discussion forum, it is recommended that you only run it with a 50hz
converter. Check out
http://www.gastmfg.com/discus/messages/23/80.html?MondayJanuary2220011124am
My question is, how much would a converter cost to handle this pump?
Preston
"Josh" <[email protected]> wrote in message
news:[email protected]...
>I have no affiliation with this seller, other than I just bought an
> identical brand new pump from him. It seems to work spectacularly.
> It's a 1/3 HP Gast 72R rocking-piston pump that can suck about 28" Hg.
>
>
> I'm pretty sure he's selling it so cheaply ($50 brand new out of the
> box, buy-it-now) because it's listed for use at 220-240VAC 50 Hz
> (European standard). Nowhere on the label or in any of the manuals
> does it say it can be used at 60 Hz, as would be standard in the US.
> Nevertheless, given that Gast sells a variant that runs at 115VAC/60 Hz
> which runs at 20% higher RPMs (go figure), I took a chance and bet that
> the motor doesn't really mind running at 60 Hz. I'd even go so far as
> to venture that it's the same exact motor, just wired for the higher
> voltage. At any rate, I got it, wired it up with a NEMA 6-15 plug,
> hooked up the starting capacitor (included), and stuck it in one of my
> 220V wall sockets. It totally sucks! And I mean that in the good way.
>
>
> I stuck a vacuum gauge on it, hooked it up to my veneer bag, and it
> sucked it down to 26" Hg in about 20 seconds.
>
> Anyway, I see that he's selling another one. It's a GREAT deal for
> this pump. I saw the same model (albeit the 115V version) for sale new
> from a store that sells equipment for pond aeration. They were asking
> almost $600.
>
> Here's the link:
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9519515004&ssPageName=MERC_VIC_RSCC_Pr4_PcY_BIN_Stores_IT
>
> Josh
>
"todd" wrote...
> That's a voltage transformer. If I understand correctly, what they're
> looking for is a frequency converter to convert 60 Hz to 50 Hz.
Actually, that shouldn't be neccesary. 50Hz motors are slightly less
efficient than 60Hz motors, so they have a little more copper and iron
inside. So a 50Hz motor will be a little heavier than a similar rated 60Hz
motor, but efficiency and heat transfer will be fine when run at 60Hz. It
will however run 120% faster.
The opposite isn't true, however. Running a 60Hz motor at 50Hz isn't a good
idea: it will be underpowered, and may not come up to speed enough to trip
off the starter circuit, if present.
--
Timothy Juvenal
www.rude-tone.com/work.htm