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Posted by Austin Shackles on October 14, 2006, 4:00 pm
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Anyone got a source for a decent-sized DPDT switch. Rated about 240V, 30A
would do. If it has an "off" in the middle, so much the better.
want it for a reversing switch for a single-phase motor, on my Colchester
Student. Currently, the motor is only 1.5HP, and I have a 2-gang 10A rated
switch pair doing this job, but it's not ideal, and in the longer term I'm
going to be putting a bigger motor on it as the 1.5HP is not really enough,
although it manages most things.
--
Austin Shackles. www.ddol-las.net my opinions are just that
"There is plenty of time to win this game, and to thrash the Spaniards
too" Sir Francis Drake (1540? - 1596) Attr. saying when the Armarda was
sighted, 20th July 1588
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Posted by Andrew Mawson on October 14, 2006, 4:13 pm
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>
> Anyone got a source for a decent-sized DPDT switch. Rated about
240V, 30A
> would do. If it has an "off" in the middle, so much the better.
>
> want it for a reversing switch for a single-phase motor, on my
Colchester
> Student. Currently, the motor is only 1.5HP, and I have a 2-gang
10A rated
> switch pair doing this job, but it's not ideal, and in the longer
term I'm
> going to be putting a bigger motor on it as the 1.5HP is not really
enough,
> although it manages most things.
> --
> Austin Shackles. www.ddol-las.net my opinions are just that
> "There is plenty of time to win this game, and to thrash the
Spaniards
> too" Sir Francis Drake (1540? - 1596) Attr. saying when the Armarda
was
> sighted, 20th July 1588
Austin,
I'd be tempted to use two contactors, one wired for 'forwards' one
wired for 'reverse' and electrically interlinked so they cannnot both
engage at the same time. Drive the contactors off your current switch.
AWEM
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Posted by Greg on October 14, 2006, 5:32 pm
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> I'd be tempted to use two contactors, one wired for 'forwards' one
> wired for 'reverse' and electrically interlinked so they cannnot both
> engage at the same time. Drive the contactors off your current switch.
If the simultaneous operation of both contactors would short the supply, as
I would assume, then a mechanical interlock should be fitted too. They're a
fairly cheap thing that bridges the pair and makes sure you can't close both
together, it's important because contactors can stick and auxiliary contacts
can fail. They're standard practice when changing a load between a mains
supply and generator, when you're not paralleling of course.
Greg
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Posted by Tim Leech on October 14, 2006, 4:14 pm
Please log in for more thread options On Sat, 14 Oct 2006 21:00:39 +0100, Austin Shackles
>
>Anyone got a source for a decent-sized DPDT switch. Rated about 240V, 30A
>would do. If it has an "off" in the middle, so much the better.
>
>want it for a reversing switch for a single-phase motor, on my Colchester
>Student. Currently, the motor is only 1.5HP, and I have a 2-gang 10A rated
>switch pair doing this job, but it's not ideal, and in the longer term I'm
>going to be putting a bigger motor on it as the 1.5HP is not really enough,
>although it manages most things.
Will the switch be actually turning the motor on & off, or just
reversing the connections while a contactor (or something else)
switches it on & off?
Tim
Dutton Dry-Dock
Traditional & Modern canal craft repairs
Vintage diesel engine service
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Posted by bigegg on October 14, 2006, 8:40 pm
Please log in for more thread options Austin Shackles wrote:
> Anyone got a source for a decent-sized DPDT switch. Rated about 240V, 30A
> would do. If it has an "off" in the middle, so much the better.
>
> want it for a reversing switch for a single-phase motor, on my Colchester
> Student. Currently, the motor is only 1.5HP, and I have a 2-gang 10A rated
> switch pair doing this job, but it's not ideal, and in the longer term I'm
> going to be putting a bigger motor on it as the 1.5HP is not really enough,
> although it manages most things.
farnell pt. number 103068
<http://uk.farnell.com/jsp/endecaSearch/partDetail.jsp?SKU=103068>
only 20A tho.
You can order their stuff through City Electrical Factors, Newey&Eyre,
Buck Hickman, or Hagemeyer, failing that contact me off-list and I can
get one for you
--
BigEgg
Hack to size. Hammer to fit. Weld to join. Grind to shape. Paint to cover.
http://www.workshop-projects.com -
Plans and free books - *Now with forum*
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> Anyone got a source for a decent-sized DPDT switch. Rated about