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| Thread ID: 97475 | 2009-02-17 09:15:00 | What does "out of spec capacitor" mean? | 2sons (14628) | PC World Chat |
| Post ID | Timestamp | Content | User | ||
| 748658 | 2009-02-18 01:03:00 | To put it all in plain English, the out of spec capacitor means it had the wrong one. :) No it doesn't. |
roddy_boy (4115) | ||
| 748659 | 2009-02-18 01:33:00 | Not really a function employed in "Start Capacitors", it is used to give a short time phase shift of some of the mains AC enabling a second winding to act ensuring the motor starts in the desired direction with a rather enhanced torque . And to sound impressive too . ;) Can't follow that anything that is just a capacitor can actually change the timing of the phases or cycles (Hz) in your electricity . I can see taking the top off the PEP and reducing the EMF/REMF - we try to knock off the top 7 . 73% of the phase peaks here - it's just a heat generator and consumes and wastes energy . But I guess that your 220 VAC single-wired, the-ground-is-just-a-rod-in-the-dirt may have somewhat different operating circumstances . I could run a medium sized iron ore smelting plant on your ground eddy effect . Such a waste! :stare: |
SurferJoe46 (51) | ||
| 748660 | 2009-02-18 02:04:00 | Can't follow that anything that is just a capacitor can actually change the timing of the phases or cycles (Hz) in your electricity. I can see taking the top off the PEP and reducing the EMF/REMF - we try to knock off the top 7.73% of the phase peaks here - it's just a heat generator and consumes and wastes energy. But I guess that your 220 VAC single-wired, the-ground-is-just-a-rod-in-the-dirt may have somewhat different operating circumstances. I could run a medium sized iron ore smelting plant on your ground eddy effect. Such a waste! :stare: It's all straight forward really, but it really amazes me why so many postings seem to require so many replies to answer a simple question :) 1.A single phase motor cannot start on its own, unlike a 3 phase motor which can. 2.A single phase motor requires an impetus in the direction you want it to rotate in order for it to start. 3. You can do this by hand on a small motor :), but it is much easier to have a separate winding. 4. Sometimes the separate winding is temporarily in circuit until the speed builds up and then a centifugal switch cuts it out. 5. A capacitor start single phase motor often has the capacitor permanently in circuit. 6. A capacitor produces a phase shift between voltage and current as can be shown by simple AC theory. 7. Roddy is correct, most likely the capacitor has failed and so has gone out of specification. It is most unlikely the wrong one was fitted initially. 8. The capacitor is not a power factor correcting capacitor |
Terry Porritt (14) | ||
| 748661 | 2009-02-18 02:05:00 | No it doesn't. Well till us with all your wisdom roddy_boy what it dose mean. :) |
Trev (427) | ||
| 748662 | 2009-02-18 02:10:00 | Well till us with all your wisdom roddy_boy what it dose mean. :) I thought farmers tilled the fields. |
Terry Porritt (14) | ||
| 748663 | 2009-02-18 02:56:00 | And retailers till your wallet | R2x1 (4628) | ||
| 748664 | 2009-02-18 09:42:00 | I can't help if my spilling aent purfect. If you dont leke it go and sux eggs. :) |
Trev (427) | ||
| 748665 | 2009-02-18 09:57:00 | 6. A capacitor produces a phase shift between voltage and current as can be shown by Please explain phase shift |
prefect (6291) | ||
| 748666 | 2009-02-18 10:00:00 | If all capacitors and condensers did was smooth out the rough bits, the beloved old Kettering ignition system would be a bit of a fizzer. | R2x1 (4628) | ||
| 748667 | 2009-02-18 10:11:00 | When the current and voltage in an alternating current rise and fall together, they are said to be in phase. If there is a capacitor fed via a resistance from an AC source, the current will rise as the capacitor starts to charge. The voltage rises more gently, and lags behind the current. As the capacitor continues to charge and the SUPPLY voltage reaches a maximum, the current into the capacitor reaches a peak, but the voltage across the capacitor rises more slowly. As the voltage of the supply starts to drop, the current into the capacitor also fall, but the voltage across the capacitor continues to rise. The voltage and current are out of phase, due to the phase shift caused by a capacitance being fed via an impedance. Meanwhile, the Government accepts the kudos for the fact that motors start, and raises the price of electricity by demanding a higher payout from the supply companies. Not only that, the intro to The Simpsons has changed! |
R2x1 (4628) | ||
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