capacitors

[tickdoc]

could anyone tell me if i replaced a 4uf with a 4.5 uf on a rdb would it harm the motor or is it ok to do it.im thinking its not.

 

[aqualogic7]

ok to go bigger but can't go smaller

 

[WHPES]

Shouldn't go bigger either according to my spark, however can get away with 10% larger he says so should be OK.

 

[stani]

Sorry to reopen an older thread but I seem to be at a loss to remember wether the resistance on the capacitor is around 100 ohms or 2200, I have these 2 figures in my head but can't rightly remember which is which.
cheers. Stani

 

[bennythedip]

It's no problem replacing the capacitor with one bigger just make sure it's rated at roughly the same voltage ie at 200v and not 400v. As for measuring resistance as far as I know you can't as it shows up as infinite, you have to measure the capacitance to check it and not a lot of meters are able to measure capacitance (its uF on a meter).

 

[zzzjim]

If your on ohms ,your actually checking motor windings-If Capacitor is not shorted !

 

[thompsonbrown]

I would always change like for like.
To small and it won't work.
To large it could fry motor.

 

[WHPES]

Occasionally if you replace like for like it still won't turn the motor if the motor is on its way out. Go slightly larger.

I had a motor stop running which was fitted with a 3 mf capacitor. A new 3 mf capacitor wouldn't turn it so I fitted a 4 mf one which worked. Nothing to lose if the motor fails but 5 years on the motor is still running fine.

 

[stani]

Can't believe I was trying ohms for a capacitator, I think it's time for me to be put out to grass. Lol. thanks for the replies lads.

 

[Dannypipe]

There is a mode on my multimeter for capacitors....but I've never used it.

 

[WHPES]

Also remember if you change the bearings especially to the rubber seal type, the armature may be a little stiff to begin with and take some setting going.

 

[oily face]

aslong as the voltage is bigger its ok

 

[lame plumber]

oi oily, we work on 240v round here and used to back when this was first posted

 

[oily face]

good man lame plumber

 

[Dannypipe]

Lol!!