Will this capacitor work?

[Dallas]

Hi guys, the motor run capacitor for my rolling shutters tubular motor
died. The cap case size is 35mm x 78mm and this is critical because it
must fit inside the motor enclosure. I've looked at hundreds of 20 µF
capacitors and they all were at least 40mm diameter (too wide). Then I
found a capacitor that is 25mm x 56.5mm. This is tiny and I'm thinking
it must be too good to be true. Can you help me decide if this
capacitor will run this motor? The printing on the original capacitor
is:
Arcotronic – (purchased by KEMET)
Part Number C.87.7ZF2 MKP
20 µF +/-5% b
320 V~ HPF N
560-8/A1
(In the USA voltage is 120 volts)
(out of production for years, none available)
And the data sheet for the prospective new little one:
https://www.farnell.com/datasheets/2755239.pdf

--
Dallas

[Ralph Mowery]

In article <qak9jv$e3r$1...@dont-email.me>, Cybnorm@spam_me_not.Hotmail.Com
says...

>
> Hi guys, the motor run capacitor for my rolling shutters tubular motor
> died. The cap case size is 35mm x 78mm and this is critical because it
> must fit inside the motor enclosure. I've looked at hundreds of 20 µF
> capacitors and they all were at least 40mm diameter (too wide). Then I
> found a capacitor that is 25mm x 56.5mm. This is tiny and I'm thinking
> it must be too good to be true. Can you help me decide if this
> capacitor will run this motor? The printing on the original capacitor
> is:

> Arcotronic ? (purchased by KEMET)

> Part Number C.87.7ZF2 MKP
> 20 µF +/-5% b
> 320 V~ HPF N
> 560-8/A1
> (In the USA voltage is 120 volts)
> (out of production for years, none available)
> And the data sheet for the prospective new little one:
> https://www.farnell.com/datasheets/2755239.pdf
>
>

I do not see any reasonthat it would not work. It is a motor run
capacitor. The uF is the same and the voltage rating is as high or
higher (much higher in this case). While not really important in your
cse, the temperature rating is 85 deg C. It would be better if it was
over 100 deg C. That just usually indicates a bette capacitor, but not
really needed in your case.

[Jeff Liebermann]

It looks ok, with one possible problem. The capacitor should be
non-polarized.
<https://en.wikipedia.org/wiki/Motor_capacitor>
Start capacitors above 20 µF are always non-polarized
aluminium electrolytic capacitors [4] with non solid
electrolyte and therefore they are only applicable for
the short motor starting time.
I dunno about the "non solid electrolyte" since the capacitor in
question is a "solid" polypropylene metallized film dielectric. Oh
well.

I can't tell from the Farnell data sheet whether it's an NP cap.
So, I found the original C87 series data sheet at:
<https://content.kemet.com/datasheets/KEM_F3063_C87.pdf>
It doesn't specifically say non-polarized, but the lack of polarity
markings and an "AC" voltage rating, indicates that it's probably NP.
Yes, it should work.

--
Jeff Liebermann je...@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

[amdx]

I'd like to pass some of your help ethic on to Phil.
But I'm afraid it would take a massive dose, and end up harming
your superpower!
Luv you Jeff, Mikek :-)

[Ralph Mowery]

In article <ftkrcepgj5vq9l3q9...@4ax.com>,
je...@cruzio.com says...

>
> It looks ok, with one possible problem. The capacitor should be
> non-polarized.
> <https://en.wikipedia.org/wiki/Motor_capacitor>
> Start capacitors above 20 µF are always non-polarized
> aluminium electrolytic capacitors [4] with non solid
> electrolyte and therefore they are only applicable for
> the short motor starting time.
> I dunno about the "non solid electrolyte" since the capacitor in
> question is a "solid" polypropylene metallized film dielectric. Oh
> well
>

The capacitor in question was listed as a motor RUN capacitor,not start.

The top of the data sheet says RUN so the non-polarized electrolyte
part should not be in question.

[Dallas]

Dallas wrote:

Yeah... I love this group. It's been years since I've been here and
I'm super happy that it's still going and not wrecked by trolls.

Thanks guys!




--
Dallas

[John Robertson]

Do you have any photos of your rollup door? I'm wondering if it is the
same make as my old 1970s vintage door on my midway rifle gallery game.

I've put a few pictures of my door motor here:

https://www.dropbox.com/sh/o74oeoers7uky55/AAB7Z8tLqrGbltXAthIOVXXia?dl=0

John :-#)#

[Jeff Liebermann]

On Sat, 4 May 2019 16:54:36 -0400, Ralph Mowery
<rmower...@earthlink.net> wrote:

>In article <ftkrcepgj5vq9l3q9...@4ax.com>,
>je...@cruzio.com says...
>>
>> It looks ok, with one possible problem. The capacitor should be
>> non-polarized.
>> <https://en.wikipedia.org/wiki/Motor_capacitor>

>> Start capacitors above 20 湩 are always non-polarized

>> aluminium electrolytic capacitors [4] with non solid
>> electrolyte and therefore they are only applicable for
>> the short motor starting time.
>> I dunno about the "non solid electrolyte" since the capacitor in
>> question is a "solid" polypropylene metallized film dielectric. Oh
>> well

>The capacitor in question was listed as a motor RUN capacitor,not start.
>
>The top of the data sheet says RUN so the non-polarized electrolyte
>part should not be in question.

Oops. I stand corrected. I wasn't paying attention to the
differences between start and run capacitors.

Run vs. Starting Capacitor
<http://www.capacitorformotor.com/starting_capacitor.html>
<http://www.capacitorindustries.com/wp-content/uploads/Run-and-Start-Capacitors.pdf>

In any case, the data sheet is the correct one for a run capacitor:
<https://content.kemet.com/datasheets/KEM_F3063_C87.pdf>

[Dallas]

John Robertson wrote:

> AAB7Z8tLqrGbltXAthIOVXXia


Yup, nearly identical. Same gears for the limit switches. (pain in
the ass :- )


--
Dallas

[Dallas]

John Robertson wrote:

> AAB7Z8tLqrGbltXAthIOVXXia



--
Dallas