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#129373 - 02/09/05 04:27 PM Need Help with a 1ph 1 speed motor
Pegitt Offline
Junior Member

Registered: 02/09/05
Posts: 1
I have a Hydro-Air HA 430 single phase 1hp motor and would like to change it to 2 speed,
is there a way to run it at a slower speed as i need to run it as a circulation pump but when i flick a switch it comes on to full power.

How do i go about doing this?



Ip-X5 220/240v 50-hz AC-1

Amps 5.2 Watts 1000

H(max) 16 m3/h 23


WB40200 MK SH

20uf +- 5% PO

AC400v B
AC450v C



Any advice appreciated.


#129374 - 02/10/05 09:29 AM Re: Need Help with a 1ph 1 speed motor
JBD Offline

Registered: 07/12/01
Posts: 599
Loc: WI, USA
A single speed capacitor start motor can not be "speed controlled".

Well, okay maybe in some very rare cases, but only if the low speed is still fast enough to operate the centrifugal cutout switch or some other means of removing the capacitor is provided.

#129375 - 02/16/05 06:19 AM Re: Need Help with a 1ph 1 speed motor
Trumpy Offline


Registered: 07/05/02
Posts: 8532
Loc: SI,New Zealand
I agree with you mate.
A Cap Start Motor needs to run up to 75% of Full Load Speed to open the C/Switch.
If it doesn't, the start winding will burn out.
Let's face it, these days if you're not young, you're old - Red Green grin


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