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Burnt Out Capacitor |
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 Oct 22 2009, 01:10 AM
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#1
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Junior Member  Group: Members Posts: 3 Joined: 22-October 09 Member No.: 6,894  |
one of the capacitors in the control box for my submersible pump has burnt out dont know wether it is a run cap or start cap what would cause this?
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Oct 25 2009, 06:26 AM
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#2
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Posting Freak Group: Moderator Posts: 2,383 Joined: 24-April 02 From: Christchurch, New Zealand Member No.: 1 |
Hello dragnuts
Welcome to the forum. A start capacitor will have some form of switch in series to take it out of circuit once the motor is up to full speed. If the switch fails, it can damage the capacitor and the start winding. If there is no switch in series, it is a run capacitor. Run capacitors fail due to old age and distorted supply voltages. Best regards, Mark. -------------------- Mark Empson administrator
Skype Contact = markempson | phone +64 274 363 067 LMPForum | LMP Tech Warehouse | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | LMP Software | Mark Empson Website |
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Oct 25 2009, 11:40 PM
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#3
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Junior Member Group: Members Posts: 3 Joined: 22-October 09 Member No.: 6,894 |
QUOTE (dragnuts @ Oct 22 2009, 12:10 PM)  one of the capacitors in the control box for my submersible pump has burnt out dont know wether it is a run cap or start cap what would cause this?
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Oct 25 2009, 11:48 PM
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#4
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Junior Member Group: Members Posts: 3 Joined: 22-October 09 Member No.: 6,894 |
the cap we are having trouble with has values of 145 - 174 mfd 330 v. The other cap is 50 uf it is in alluminium casing can this tell us which is which?
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Oct 26 2009, 05:59 AM
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#5
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Senior Member Group: Full Member Posts: 301 Joined: 21-October 06 Member No.: 2,159 |
QUOTE (dragnuts @ Oct 26 2009, 04:48 AM) the cap we are having trouble with has values of 145 - 174 mfd 330 v. The other cap is 50 uf it is in alluminium casing can this tell us which is which? As Mr.Mark recommended, check which cap has a disconnecting switch in series with one lead, which would be a staring cap. I think “145 - 174 mfd 330” is this. -------------------- "Don't assume any thing, always check/ask and clear yourself".
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Oct 27 2009, 03:56 PM
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#6
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Member Group: Full Member Posts: 78 Joined: 13-June 09 Member No.: 5,502 |
All start capacitors I met have been in black plastics, all run ones are in aluminium casing or in white plastics.
At the same size the start cap has 3 or more times more capaciatance than the run cap. Be careful, a start cap cannot be kept under voltage more than for few seconds - if longer, it will explode. |
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