OT - Start capacitors
 

Our small concrete mixer blew the start cap so we have to spin it by hand to
get it going. It is a 110 volt motor, probably 1/3 hp. It uses a 40 mfd, 400
volt cap. The closest Grainger has that I can find is a 43-50 mfd, 250 volt.
Would that work, or do we need to get a 40 mfd? What about the voltage rating,
is 250 ok since this is a 110 volt motor, or do I need to stick to a 400 volt
rating?

--
Dennis

OT - Start capacitors
 

The tolerances for start caps is uneven. Something like - 20 % plus
100%. I don't think you will have any problem with using the 43-50
mfd 250 volt. If you rewired the motor for 240 volt operation, it
should still be okay. Typically the start winding is always used on
120 volts.

Dan

OT - Start capacitors
 

In article .com,
says...

The tolerances for start caps is uneven. Something like - 20 % plus
100%. I don't think you will have any problem with using the 43-50
mfd 250 volt. If you rewired the motor for 240 volt operation, it
should still be okay. Typically the start winding is always used on
120 volts.

Thanks. I went down to Surplus Electronics near me and found a 40 mfd 250 v cap
for. I also discovered the switch on the mixer had gone bad so I picked up a
weatherproof 20 amp switch. Everything works fine again, only ten bucks spent.

--
Dennis

OT - Start capacitors
 

According to DT :
In article .com,
says...

The tolerances for start caps is uneven. Something like - 20 % plus
100%. I don't think you will have any problem with using the 43-50
mfd 250 volt. If you rewired the motor for 240 volt operation, it
should still be okay. Typically the start winding is always used on
120 volts.

Thanks. I went down to Surplus Electronics near me and found a 40 mfd 250 v cap
for.

Make sure that it is *marked* as a start capacitor. 40 uf 250V
sounds like a common DC rating, and a surplus electronics place is more
likely to have DC caps than the AC rated ones needed for motor starting
duty.

If it is DC rated -- you'll be lucky if it lasts a single start.

I also discovered the switch on the mixer had gone bad so I picked up a
weatherproof 20 amp switch. Everything works fine again, only ten bucks spent.

O.K. So you *did* get a motor starting cap, not a DC one.
Good.

BTW I find it good practice to have a couple of spares on hand,
since they tend to go out in the middle of a project just late
enough into a weekend so you can't buy replacements until
Monday. :-)

Enjoy,
DoN.
--
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