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How do I wire both start and run capacitors to a 7.5 HP electric motor. There are 2 start & 2 run capacitors in the system.

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Need to know the brand of motor ac or DC 220 or 440

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Do manufacturers of electric, cap-start/cap-run, 1ph motors use a standard wiring code for the capacitor wiring?


probably not as different manufacturers use what ever wire is available at the time of manufacture
however there is a standard attachment method for the capacitors and that is the diagram that you should be seeking
for example-- many capacitors have two lots of connected terminals and the motor will have only 2 wire ,so connection is to one each of the terminals that is not connected
others have 3 wires so one wire on one terminal and two wires on the connected terminals
This is knowledge that motor repairs will have learnt in their trade so it may be advantageous for you do do a lot of home work on power

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Fujita 3hp split system Compressor won't start


Ohm out the compressor...if it is new & getting the correct power, should be under warranty. You should not have to install a hard start kit on a new unit.

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1 Answer

Motor stall


if the motor has 3 phase ( test the terminal motor for voltage) if there are the motor need repair, brushs, ball bearing, or winding faulty)
2) if the motor is 1 phase, the capacitor or centrifugal switch is faulty or windin run or starting can be faulty. However in ANY case try to TIGHT ANY wires loose or connector, or corroded contacts in the relais or contactor, clean with alcohol isopropyl or c.solvents.
God bless you

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Capacitor type


take capacitor to electric supply store to match up

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I have an aqua flow master 3.8 hp xp2 pump in my hot tub, it sounds like it is receiving power as it is clicking on but it will not start. have i fried the motor? the shaft turns ok but nothing is...


Many of these pump motors have a capacitor and start & run windings. I had a pump motor a week ago that was free to rotate, but only hummed. I looked inside the back end, everything looked good, I bought a capacitor online for $7 + $15 shipping, installed it and it worked. The capacitor will have voltage & rating on the side.
BE CAREFUL, CAPACITORS KEEP VOLTAGE EVEN WHEN NOT PLUGGED IN. If you don't know how to handle them, take the motor to a local motor repair shop.
Gary

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Compressor starts innitially,then when pressure gets low it trips breaker when it tries to start back up.20 amp breaker to light switch to compressor is about 2o ft on12-2 wire. tried 30 amp breaker,does...


the start capacitor on the motor body is weak,the motor needs this component to over come the air pressure when cycling to re-build the low air pressure,change both the start and run capacitors when doing the start because the other run capacitor is just as old and it will soon fail

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1 Answer

Wiring of 2hp motor


You need to take advice from the motor manufacturer or reconditioner to ensure you are wiring it correctly.

Typically a basic single phase motor will have a start winding and a run winding. That usually makes four wires for a reversible motor but that can be cut to three if the motor must run in one direction only so the three wires would be start, run and common.

The run is connected to the hot side of the supply and the start similarly connected to the hot side except the start capacitor will be in series. The common wire will require connecting to a neutral and of course the motor body will need a ground unless it is double insulated.

It should be possible to sort which is which using a sensitive ohmmeter.

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1 Answer

1/3 hp drill press motor runs hot and very slow.


Look instead at the motor and drill post bearings. Remove the belt to see if the motor runs correctly with no load. If it still hums and gets hot, check that the motor itself turns freely (when off). If the motor seems to be ok, turn the driven pulley by hand--it should also turn freely. The capacitor is usually a starting assist, not running. To test, wrap a small rope several turns (when pulled must turn in the normal direction) around the small motor pulley and pull smartly while turning the motor on. If it now comes up to speed, the capacitor has lost capacitance. Electronic parts suppliers like Jameco or Mouser have such items.

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1 Answer

Fan runs, compressor tries to start then kicks out on overload.


i am not familar with this model number..

1. are you using the right type of capacitor. you need a "start" capacitor not a run capitor. make sure that capacitor is the proper size.
2. have you tried a hard start kit?
3. is their oil in the new compressor?
4. was the old compressor for r-22 or 410a?
5. is the new compressor for the proper refrigerant?
6. is there refrigerant in the system?
7. is it wired right?
8. is this a heat pump? if so is your reversing valve operationing properly?
9. was the old compressor a mechanical or electrical failure?
if electrical did you install a new filter drier?
10. just because the new compressor is new does not mean it is good
11. do you have the proper voltage?

good luck
hvac teacher



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3 Answers

Dayton Motor and capacitors for Carrier AC Unit (model # 38ck030300)


The 2 brown wires to the cap in first legend is how they are wired electrically,inside that motor the run winding is common to that brown one they cappped off in the 2nd option, but the powers still going to Run.ommon and run get the juice either way, its just another way to do it, but electrically as to sides of power and where they go is no different, just different way to do it.you can run power in on the Run terminal on the run cap, the run winding and run cap and start cap if equipped are Run to Run to Run.So the hot leg for the run winding also goes to run on the caps, run to run to run.,run winding to run cap to run on start cap.

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