| [GMCnet] Soft start for AC [message #327367] |
Wed, 20 December 2017 19:43  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Hi Emory,
These soft start boxes are way different from start capacitors. Yes, if the start cap is bad it should be replaced.
These boxes allow a properly functioning roof AC unit to start with half the start up amps of a unit without the soft start box. Since start amps are considerably higher than the amp draw running, they often allow a smaller gen to run the roof AC units.
I use variable frequency drives to power three phase motors on my woodworking equipment to run from single phase power. One side benefit is the user can program the start draw ramp. For example, I run European three phase motors at 50 hz (which they were designed for) instead of 60 hz standard in the US. The result is the motors run cooler, quieter and a bit slower. I often program the ramp to keep the max amp draw below 8 or 9 amps even on 5 HP motors that would draw way more than that on their own.
The technology is similar to that used in these soft start boxes allowing single phase motors running on single phase power to start with a lower amp draw.
Jerry Work
Kerby, OR
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Message: 11
Date: Wed, 20 Dec 2017 17:32:15 -0700
From: Emery Stora
To: gmclist@list.gmcnet.org
Subject: Re: [GMCnet] Soft start for AC
Message-ID:
Content-Type: text/plain; charset=us-ascii
Often a failing or failed motor start capacitor will cause the problem. Replacement of a bad capacitor is a much cheaper fix.
Emery
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Jerry & Sharon Work
78 Royale
Kerby, OR
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