Pump Capacitor

B

Biguns

Joined
12 Nov 2008
Messages
692
Reaction score
93
Location
Tyne and Wear
Country
United Kingdom
Friends Grundfos 15-45 x18 pump giving problems.I know it is the capacitor that has failed. The pump is otherwise fine. Try as I may I can not find a replacement capacitor on the net, Maplins and Screwfix dont do them. Anyone got any ideas
The failed one is a :- Pye MK. 2.5uf. 350 volt. 50Hz

Maplin's do a one which is 400 volt will that one work?

Or are we now expected to pay £60 for a new pump instead of £3 or £4 for a part
 
Sponsored Links
it wouldn't need to be in the housing if it won't fit though.

often wondered why the cheapskates a BG towers have not sourced new capacitors for us to use.
 
Cheers John.
If it is physicaly too big to go inside the the pump electrical conection box I will secure it on the outside.
 
Sponsored Links
snugib - haven't you got a dud pump you can pinch one from?
 
Warning with a 400v cap !

Make sure that its one designed for AC !

Tony
 
Agile said:
Warning with a 400v cap !

Make sure that its one designed for AC !

Tony
Click to expand...

A 400V DC rated capacitor will be well within spec for 230V AC

I think I can see where you are coming from tony, but
230vac (RMS) = 325V peak to peak (hence the 350v rating of the original)

Matt
 
matt1e said:
A 400V DC rated capacitor will be well within spec for 230V AC
Matt
Click to expand...

Some types (electrolytic, tantalum etc.) are polarised so only work on DC
and must be connected the right way round.
 
mikeyd said:
matt1e said:
A 400V DC rated capacitor will be well within spec for 230V AC
Matt
Click to expand...

Some types (electrolytic, tantalum etc.) are polarised so only work on DC
and must be connected the right way round.
Click to expand...

I Know, but we are talking about a single phase ac motor cap here so irrelevant, though granted the op should be fitting the correct type of cap

Matt
 
I have to disagree with you there Matt.

Its not the voltage thats relevant but the current through it.

Applying AC to a capacitor creates a current which will generate heat and in relation to motor or PFC caps requires a power rating which will accommodate the considerable heat generated.

Smoothing caps are rated for the AC current through them as well as the DC maximum voltage.

Furthermore with mains voltages subject to significant surges and spikes a safety factor for voltage is usually at least 1.5 times the expected nominal voltage.

Tony
 
D

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
You must log in or register to reply here.
Sponsored Links

Similar threads

M
vaillant ecomax 835E pump not working fault f22
Replies
4
Views
3K
ChrisR
ChrisR
J
Stuart Turner Shower Pump Spare Parts
Replies
1
Views
7K
bernardgreen
bernardgreen
R
Grundfos pump..
2 3
Replies
32
Views
10K
Steelmasons
Steelmasons
B
Grundfos CH Pump
Replies
3
Views
710
Agile
Agile
M
UPS2 pump failure
Replies
14
Views
7K
MrDuck
M
Back
Top