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  Capacitor question 2

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bills

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Join date : 2010-10-12
Location : Left Coast

PostSubject: Capacitor question 2   Wed Oct 13, 2010 3:36 pm

Ok all you Capacitor guys.

Is there a difference between a motor run Capacitor and a HID lighting Capacitor ?
We use a 6mf 440v capacitor in the 277volt wall pack lights at work in the past i have used
motor run caps for replacement and did not have any problems.
Now they seem to be going bad way to soon. (2 to 6 weeks)
The vendor (grangers) said there is a difference between the two.
Of course they don't sell lighting Capacitor's.
BTW these are made in China I think that is the problem.
any ideas?
thanks
bill
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smeezekitty

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PostSubject: Re: Capacitor question 2   Wed Oct 13, 2010 3:42 pm

bills wrote:
Ok all you Capacitor guys.

Is there a difference between a motor run Capacitor and a HID lighting Capacitor ?
We use a 6mf 440v capacitor in the 277volt wall pack lights at work in the past i have used
motor run caps for replacement and did not have any problems.
Now they seem to be going bad way to soon. (2 to 6 weeks)
The vendor (grangers) said there is a difference between the two.
Of course they don't sell lighting Capacitor's.
BTW these are made in China I think that is the problem.
any ideas?
thanks
bill
Maybe its a bad batch or brand.
Maybe you should consider switching capacitor brands.
I am pretty sure motor run caps are just oil filled non polarized capacitors.
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bills

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PostSubject: Re: Capacitor question 2   Wed Oct 13, 2010 3:47 pm

I did try a different vendor (mcmaster carr) and I have had similar failures.
These were of a different mfg. and seem a little better but not much.
BTW these were also made in China.

bill
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smeezekitty

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PostSubject: Re: Capacitor question 2   Wed Oct 13, 2010 3:56 pm

bills wrote:
I did try a different vendor (mcmaster carr) and I have had similar failures.
These were of a different mfg. and seem a little better but not much.
BTW these were also made in China.

bill
I haven't had any trouble with Chinese capacitors, although I do not use them in professional production.


Last edited by smeezekitty on Wed Oct 13, 2010 3:57 pm; edited 1 time in total (Reason for editing : typo)
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glasdave

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PostSubject: Re: Capacitor question 2   Thu Oct 14, 2010 1:27 am

Surplus Center lists a 370 volt 5 mfd, motor run cap, that might work. Part #22-1249, 1-800-488-3407, 24 hour number.

Out of the 283A catalog.
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radiotechnician



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PostSubject: Re: Capacitor question 2   Thu Oct 14, 2010 9:40 am

Motor run capacitors must be replaced with same capacity and rated or higher voltage. If you change the microfarad rating, you change the way the motor runs and the current it draws and may cause high winding voltage (burnout).

If you find an exact match in voltage, capacity, temperature and duty rating, make sure you house it on the motor or enclosure the same way the original was.
And be verey carefull- if it doesnt say- NON PCB--you have to treat is as if it did contain PCB oil.


de
VE7ASO
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burnt fingers



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PostSubject: Re: Capacitor question 2   Thu Oct 14, 2010 11:08 am

If the Chinese are shipping them with PCB's that means they will run cooler and longer, just like the old USA ones from the 60's and before. Just dont tell the EPA pig

I had problems with crap tubular Mallory motor capacitors on my well pump and finally went with an old 4000VDC GE Pyranol that came within 10% of value and its been holding up for over 15 years.

Carl
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Alan Douglas



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PostSubject: Re: Capacitor question 2   Thu Oct 14, 2010 12:43 pm

I suspect it's the current rating that's the problem. Metallized electrodes can be too thin to carry current. And making contact to foil is more reliable than to a metallized surface.
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