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Lynne12/03/2014 23:56:37
117 forum posts
32 photos

Are there digital inv. mfg. that do not have speed control etc ? I have a Raglan

which has speed control built in, but I wish to fit a 3 phase motor.

Regards Lynne

Thor 🇳🇴13/03/2014 05:25:52
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1766 forum posts
46 photos
Ehm.. Lynne, why not just use the inverter fixed at 50Hz? You don't have to use the "speed control" of the inverter.
Thor
john kennedy 113/03/2014 06:20:31
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214 forum posts
24 photos

How is the 'speed control built in'. If its mechanical then Thor has the answer. If its electrical then I doubt it. You can of course use a Variable Frequency Drive (inverter?) and wire the electrical speed control, For/Off/Rev and E stop as if it were the pendant control. Loads on the net about it.Do a search for 'wiring a VFD.

 

Edited By john kennedy 1 on 13/03/2014 06:21:48

David Jupp13/03/2014 08:21:11
978 forum posts
26 photos

They do exist without speed control, but may be difficult to find. As previously mentioned, you are not forced to use the speed control - I run my drill via an inverter, frequency is set at 50Hz and the options for frequency control are not connected or configured. Speed ramps are set for start up, to limit start up current.

Neil Wyatt13/03/2014 13:13:32
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19226 forum posts
749 photos
86 articles

Try Transwave at right - they sell static converters that will do the job you want without the cost or complexity of an inverter.

Neil

Lynne13/03/2014 22:15:47
117 forum posts
32 photos

Thanks to everyone who has responded to my enquiry. The Raglan has a mechanical variable speed control.

I did appreciate that I could simply leave the inverter on a 50Hz setting, but why pay for a facilities that one is never going to use.

My understanding is that the digital inverter produces 3phase which is very close to the real thing, as opposed to the static(capacitor reliant) inverter, and I want the digital version. Regards Lynne

Michael Gilligan13/03/2014 23:01:34
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23121 forum posts
1360 photos
Posted by Lynne on 13/03/2014 22:15:47:

Thanks to everyone who has responded to my enquiry. The Raglan has a mechanical variable speed control.

I did appreciate that I could simply leave the inverter on a 50Hz setting, but why pay for a facilities that one is never going to use.

My understanding is that the digital inverter produces 3phase which is very close to the real thing, as opposed to the static(capacitor reliant) inverter, and I want the digital version. Regards Lynne

.

Lynne,

I stand to be corrected, but; I suspect that, due to the strange economics of mass-production, you may find it cheaper to buy the variable speed inverter ...

MichaelG.

Russell Eberhardt14/03/2014 10:13:41
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2785 forum posts
87 photos
Posted by Neil Wyatt on 13/03/2014 13:13:32:

Try Transwave at right - they sell static converters that will do the job you want without the cost or complexity of an inverter.

Neil

Their cheapest static converter seems to be £290 depending on the motor size you can buy several digital inverters for that price!

One advantage of keeping the mechanical speed control is that the motor cooling will work better. Running a 3 phase motor at low speed can result in overheating if you're not careful with your choices.

Russell.

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