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Topic Title: Speed control for 3 phase motor
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Created On: 13 August 2014 06:08 PM
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 13 August 2014 06:08 PM
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mossep

Posts: 351
Joined: 05 December 2010

I have a client with a 5.5kW 3 phase motor who wants to be able to slow it down, it pumps liquid and its running faster than they want it to. can anyone point me towards the equipment needed to do this? At the moment it is operated by a simple DOL starter.

Thanks

Martin

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 13 August 2014 06:16 PM
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OMS

Posts: 19853
Joined: 23 March 2004

Belt and pulley change (if applicable) if you only need a change of speed for the new duty

Simple VSD drive to either lock in and change the speed as a constant as above or to give variable speed control if required

Regards

OMS

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 13 August 2014 06:21 PM
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hifly

Posts: 711
Joined: 06 November 2005

could some of the liquid be diverted back to where it comes from and so slowing the rate it is output.

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Vince

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 13 August 2014 07:00 PM
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mossep

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Client wants to be bale to adjust the speed so needs to be user friendly, not permanent. I will look up VSD drives, any particular information I should look for in one?

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 13 August 2014 07:45 PM
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prophet

Posts: 248
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Small VSD with a pot to alter speed. Have used Hitachi many times with no problem, if that helps.

Tom
 13 August 2014 08:45 PM
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Jaymack

Posts: 4754
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Originally posted by: mossep
can anyone point me towards the equipment needed to do this?

If the required flow is indeed variable, this is a typical application for a VSD. Search on the internet and get quotes from well known makers. They should ask some relevant questions.

Regards
 13 August 2014 08:56 PM
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mossep

Posts: 351
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Ive had a look online to see what they are. The ones I have seen have start / stop buttons on them, do they replace the existing DOL starter that operates the pump at the moment and do they have contacts for remote stop buttons?

Sorry for the stupid questions...

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 14 August 2014 01:19 PM
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davebp

Posts: 116
Joined: 16 April 2009

Hi Mossep,

Yes, a VSD replaces the DOL starter, and provides overload protection to the motor it controls. This is done by programming the VSD with all of the motor faceplate information, and often by running a test sequence with motor disconnected from its mechanical load.

All the drives I've used have the option of connecting analogue inputs such as direction control, run switch, emergency stop circuit inputs and a potentiometer to vary the output frequency of the drive. How you install the drive is up to you; - you could use all of the on-board controls (usually on a removable panel with the LCD display) - you can often extend these using the manufacturer's own pre-made cable. Often though, it is more preferable to provide industrial-style push button stations for the often used controls like start and stop, as the drive's usually have tiny membrane buttons that won't last long in an industrial environment.

Dave
 14 August 2014 02:09 PM
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hifly

Posts: 711
Joined: 06 November 2005

in hunting for data on my motor i found this company

http://www.inverterdrive.com/g...Inverter-Drives-400V/

it looks like they may sell what you require.

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Vince

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