Capacitor advice

[Jam es]

See the attached wiring diagram. From a previous post I determined that I need to add a capacitor to the circuit. I was told by at least one person that it needs to be a run capacitor and NOT a start capacitor. Can someone confirm this for me and tell me what about the diagram indicates whether it should be a start or run capacitor. Thanks in advance for any and all assistance.

 

[waross]

That is a PSC motor.
Permanent Split Capacitor motor.
There is no starting switch to take the starting winding out of the circuit after the motor starts.
The capacitor stays in the circuit as long as the motor is running.
As start capacitor is for short time duty and will overheat if left in the circuit when the motor is running.
Use a run capacitor.

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[Jam es]

Thank you Bill. Can you (or anyone else) suggest an online source for the capacitor that I need?

James

 

[ScottyUK]

Ebay? They're pretty common over here in the UK, can't imagine that things are much different where you are. Or a motor overhaul shop, but that will probably cost you more. A capacitor with a slightly greater capacitance than stated won't do any harm, and it must have a rated voltage equal to or greater than stated on the maker's plate.

Here's an example:

https://www.ebay.co.uk/itm/DUCATI-5...846610?hash=item3d5cacffd2:g:kv4AAOSwEftaqAPj

 

[che12345]

Dear Mr.waross
" That is a PSC motor. There is no starting switch to ... after the motor starts. The capacitor stays in the circuit .... motor is running. As start capacitor is for short time duty and will overheat if left in the circuit when the motor is running. Use a run capacitor ".
Q. Please advise:
1. how to differential between a " start capacitor " and a "run capacitor " as their (intended usage) is [not stated] in the ratings.
2. why there is (no warning sign) in any " start capacitor " that it [shall not] be used as a "run
capacitor "
3. there are numerous " start capacitor " on the market that is used for air-condition units and single-phase capacitor-start motors. Can these " start capacitors " be used as "run capacitors " with the correct capacity (uf) and voltage rating (Vac)?
4. there are numerous power-factor correction capacitors on the market, they [shall] be "run capacitors "?
that is, a (wrong) " start capacitors " if used would be over-heated and may cause an explosion?
5. what are the difference in the manufacture point of view between the two different types ?
6. which IEC/ANSI Standard differentiates the different types and their intended application?
Che Kuan Yau (Singapore)

 

[3DDave]

http://www.capacitorindustries.com/wp-content/uploads/Run-and-Start-Capacitors.pdf

 

[Jam es]

Thanks to Scotty and to Dave for the info and suggestions. I think I have all that I need now to get this motor running. Safely.

 

[waross]

3DDave; Thanks for the authoritative answer to Mr Che's question.
In addition;
Motor capacitors are single capacitors.
Power factor correction capacitors are three single phase capacitors in a common package.
Power factor correction capacitors include internal discharge resistors.
Power factor correction capacitors are often rated in KVAR rather than uF.
The KVAR rating is voltage dependent.
eg; A PF correction capacitor rated for 20 KVAR at 480 Volts will produce only 5 KVAR at 240 Volts, even less at 208 Volts.


Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[Jam es]

I've uploaded a couple of photos of the capacitor that I purchased for this. Can anyone advise me on whether it matters which pole on the capacitor should be connected to the power source and which side should connect to the motor? Additionally please tell me if the following assumption is correct. I'm thinking that the source wires (US 220 single phase) should connect this way >>> Green source to Green/Yellow motor, White source to Blue motor, Black source to (which?) pole on capacitor and continuing to Black motor, and (other) pole on the capacitor to Brown motor. (Or is it Black source and continuing to Brown motor with (other) pole to Black motor? Or am I totally off the mark?) Once again, thanks in advance for any assistance.

 

[Jam es]

Not sure why but photo links are not showing in previous post. This is photo of capacitor connections.

 

[3DDave]

After uploading you need to add links to the upload so people can find them.

 

[Jam es]

This is photo of capacitor specs.