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Topic Title: 53A hydraulic pump on 63A fuse.
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Created On: 03 July 2012 07:44 PM
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 03 July 2012 07:44 PM
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hertzal123

Posts: 303
Joined: 26 August 2007

A customer requires a new supply for a 30kw hydraulic test pump motor,(star delta)All existing dis boards use obsolete Dorman Smith mcb,s & main busbars cannot be isolated.There,s a spare 63A BS88 switch fuse available & I wondered if it was worth trying this before trying to find another solution.Thanks for any advice,
hz
 03 July 2012 07:53 PM
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Avatar for OMS.
OMS

Posts: 19671
Joined: 23 March 2004

Swap the fuses for gM pattern, say 63/100 (if the EFLI will permit)

Regards

OMS

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Failure is always an option
 03 July 2012 08:24 PM
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neilparsons

Posts: 31
Joined: 29 October 2002

With a 30kW motor you are getting towards the upper limit for a star/delta start on 63A BS88 fuses. As OMS said, your best bet would be 63A motor rated fuses. I would suggest 63M80.
 03 July 2012 09:35 PM
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hertzal123

Posts: 303
Joined: 26 August 2007

Thanx for the help,will try fuses as suggested.
Regards,hz.
 04 July 2012 04:21 AM
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jleltd

Posts: 199
Joined: 11 March 2009

The Power pack should start unloaded and should be able to start with a minimal start time and current, the 63A switchfuse if AC3 should be fine if the power pack and the fluid circuts are designed properly.

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James
 04 July 2012 08:11 PM
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dlane

Posts: 690
Joined: 28 September 2007

Hi,

If the above fails you could try swapping out the star/delta starter for a soft-start unit that would decrease the start up current of the motor.

Kind regards

Donald Lane
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