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PCB containing capacitors must be replaced and disposed by consulting local environmental authorities. If these capacitors leak or fail, PCBs can be released into the environment and will very likely result in extremely expensive environmental cleanups, and potentially, lawsuits. There are extensive
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If a wrong capacitance value is installed, it will cause an uneven magnetic field around the rotor. This causes the rotor to hesitate at the uneven spots, resulting in irregular rotation, especially under load. This hesitation can cause the motor to become noisy, increase energy consumption, cause
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Start capacitors briefly increase motor starting torque and allow a motor to be cycled on and off rapidly. A start capacitor stays in the circuit long enough to rapidly bring the motor up to a predetermined speed, which is usually about 75% of the full speed, and is then taken out of the circuit,
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is broken. If the switch is always open, the start capacitor is not part of the circuit, so the motor does not start. If the switch is always closed, the start capacitor is always in the circuit, so the motor windings will likely burn out. If a motor does not start, the capacitor is far more
393:(PCBs). These are extremely toxic and persistent chemicals with many long-lasting negative human and wildlife health effects. Capacitors were required to be labeled in the U.S. with "No PCBs" or similar language. Capacitors without these labels are suspect.
249:μF, and also on the voltage. A 440-volt capacitor can be used in place of a 370-volt, but not a 370-volt in place of a 440-volt. The capacitance must remain within 5% of its original value. Round cylinder-shaped dual run capacitors are commonly used for
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to leak out. Some capacitors have a "pressure-sensitive interrupter" design that causes them to fail before internal pressures can cause serious injury. One such design causes the top of the capacitor to expand and break internal wiring.
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A faulty run capacitor often becomes swollen, with the sides or ends bowed or bulged out further than usual; it can then be clear to see that the capacitor has failed, because it is swollen or even blown apart causing the capacitor's
265:(μF). Older capacitors may be labeled with the obsolete terms "mfd" or "MFD", which can be ambiguous but are, especially in this context, used for microfarad as well (a millifarad is 1000 microfarads and not usually seen on motors).
253:, to help in the starting of the compressor and the condenser fan motor. An oval dual run capacitor could be used instead of a round capacitor; in either case the mounting strap needs to fit the shape used.
210:(historically: metallised paper capacitors) and are energized the entire time the motor is running. Run capacitors are rated in a range of 1.5 to 100 μF, with volt classifications of 250, 370 and 440 V.
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supports two electric motors, with both a fan motor and a compressor motor. It saves space by combining two physical capacitors into one case. The dual capacitor has three terminals, labeled
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Over many years of use the capacitance of the capacitor drops; this is known as a "weak capacitor". As a result, the motor may fail to start or to run at full power.
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compressor units, to boost both the fan and compressor motors. Permanent-split capacitor (PSC) motors use a motor capacitor that is not disconnected from the motor.
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When a motor is running during a lightning strike on the power grid, the run capacitor may be damaged or weakened by a voltage spike, thus requiring replacement.
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Simple capacitor-start single-phase motor circuit diagram. Note that starting capacitor is connected in series with auxiliary winding just like in
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require a "run capacitor" to energize the second-phase winding (auxiliary coil) to create a rotating magnetic field while the motor is running.
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Run capacitors are designed for continuous duty while the motor is powered, which is why electrolytic capacitors are avoided, and low-loss
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Dual capacitors come in a variety of sizes, depending on the capacitance (measured in microfarads, μF), such as 40 plus 5
654:"CPSC, Firms Announce Recall of Infinity and Lifestyle Spas" U.S. CPSC, Washington, DC, CPSC.gov, 2003-12-09, webpage:
381:(CPSC) has received more than 100 reports of incidents of overheating of the motor capacitor, with some fires started.
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677:"Identification, Management, and Proper Disposal of PCB-Containing Electrical Equipment used in Mines"
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has much information on the correct way to test and manage these toxic chemicals in older capacitors.
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with non solid electrolyte and therefore they are only applicable for the short motor starting time.
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http://electronics.stackexchange.com/questions/101408/what-is-the-purpose-of-the-motor-run-capacitor
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that releases at that speed. Afterward the motor works more efficiently with a run capacitor.
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349:/EN 60252-1 2011 specifies the following levels of protection for motor run capacitors:
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to create a rotating magnetic field. There are two common types of motor capacitors,
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circulating pump can overheat if defective. This poses a fire hazard, and the
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This link only shows irrelevant types (July 2018) do they even exist?
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heat furnaces for example. A "dual run capacitor" is used in some
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https://www.epa.gov/sites/production/files/documents/pcbidmgmt.pdf
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http://highperformancehvac.com/run-start-capacitors-hvac-motors-1/
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629:"MotorCap DM AC Film Capacitors for Motor Run Applications"
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and tools are available to assist in formatting, such as
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toxicological reports on PCBs in the research community.
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Motor capacitors manufactured before 1978 likely contain
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Motor start and motor run capacitors; capacitorguide.com
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http://www.capacitorformotor.com/motor_capacitor.html
206:are used. Run capacitors are mostly polypropylene
152:μF, with four major voltage classifications: 125
214:performance to drop and the motor to overheat.
799:http://www.wikihow.com/Check-a-Start-Capacitor
433:"Capacitor Sizing Dilemmas (motor capacitors)"
148:Start capacitors usually have ratings above 70
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718:, which are uninformative and vulnerable to
373:A motor capacitor which is a component of a
356:S1, S2 – fail open-circuit or short-circuit;
27:Electrical capacitor used in electric motors
733:and maintains a consistent citation style.
834:Heating, ventilation, and air conditioning
598:"AC Capacitors for Motor Run Applications"
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527:: CS1 maint: location missing publisher (
775:Learn how and when to remove this message
319:Learn how and when to remove this message
499:(3rd ed. rev. and expanded ed.). .
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379:U.S. Consumer Product Safety Commission
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468:. justtherightair.com. Archived from
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684:U.S. Environmental Protection Agency
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301:adding citations to reliable sources
187:likely the problem than the switch.
725:Please consider converting them to
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496:Energy-efficient electric motors
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603:. GE Capacitors. Archived from
288:needs additional citations for
88:that are in turn used to drive
84:Motor capacitors are used with
43:A typical motor start capacitor
729:to ensure the article remains
547:. Firewall Media. 2024-02-19.
240:hermetically-sealed compressor
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544:Alternating Current Machines
464:JustTheRightAir (Sep 2008).
359:S3 – fail open-circuit only.
86:single-phase electric motors
634:. Epcos AC, Munich, Germany
466:"Round Dual Run Capacitors"
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391:polychlorinated biphenyls
171:Start capacitors above 20
30:Not to be confused with
177:electrolytic capacitors
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297:improve this article
493:Emadi, Ali (2018).
431:LA.gov, Louisiana.
353:S0 – no protection;
218:Dual run capacitors
64:alternating-current
661:2013-01-08 at the
224:dual run capacitor
204:polymer capacitors
197:AC electric motors
195:Some single-phase
184:centrifugal switch
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829:Capacitors
818:Categories
765:April 2023
731:verifiable
638:2012-04-22
614:2011-09-04
515:1083013923
476:2008-09-24
439:2012-01-29
405:References
164:V, and 330
122:LC circuit
102:forced-air
716:bare URLs
523:cite book
53:capacitor
720:link rot
659:Archived
435:. LA.gov
399:U.S. EPA
257:Labeling
57:windings
375:hot tub
98:jacuzzi
94:hot tub
740:reFill
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385:Toxic
59:of a
748:and
549:ISBN
529:link
511:OCLC
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369:Heat
238:for
236:HERM
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656:CP7
347:IEC
299:by
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