Reverse 240V Motor
Reverse 240V Motor
(OP)
I have a 240V single phase capacitor driven 1HP motor.
How do you reverse the spinning of the motor?
How do you reverse the spinning of the motor?
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RE: Reverse 240V Motor
To reverse the direction, reverse the polarity of one winding only and the motor will start in the opposite direction.
Best regards,
Mark
Mark Empson
L M Photonics Ltd
RE: Reverse 240V Motor
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RE: Reverse 240V Motor
Just switch the capacitor from one coil to the other;
i.e from the starting winding to the running.Leave the capacitor end connected to the neutral in place , switch the coils in the other end of the capacitor
good luck
mohamed
RE: Reverse 240V Motor
Not very good advice. You are familiar with one type of motor which is generally used as an integral part of an assembly or mechanism, not a stand alone, general purpose motor.
The majority of single phase motors in use may burn out and/or explode the capacitor if your advice is followed. I will admit that they may run in reverse for a short time before they die.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
Thanks for the comment. In fact what you suggest is ture for a start capacitor (plastic cased)which can't stay in the circuit more than few seconds, or it may burn and even explode.on the other hand run capacitrs(metal cased round or oval) are designed to stay
no trouble as long as they meet the voltage requirement.
The capacitor creates a leading or lagging pf, shifting the phase angle to create the rotating magnetic field in need.
What I understood from keith is that the capacitor is
a metallic run capacitor.
thank you guys for this helpful discussio
mohamedone
RE: Reverse 240V Motor
Your suggestion assumes that the start and run windings are identical but wound with 90 degrees positional displacement.
If the two windings are not identical, then you will do damage to windings and/or capacitors.
Best regards,
Mark.
Mark Empson
L M Photonics Ltd
RE: Reverse 240V Motor
I am starting to beleive that the motor is one that cannot be reversed.
Anyways, thanks to one and all for your comments
RE: Reverse 240V Motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
RE: Reverse 240V Motor
Keith Cress
kcress - http://www.flaminsystems.com
RE: Reverse 240V Motor
I was looking in the Brook crompton page and I found this:
" Permanent Capacitor - PDA
Standard Design: Direct-on-line starting only, with any spot voltage between 200-250 volts available. Suitable for fans blowers and centrifugal pump drives with light starting requirements. Starting torque is between 25% and 55% of full load torque, according to frame size. Clockwise or anticlockwise rotation of the shaft is available by re-connection. Available in outputs from 0.09kW to 2.2kW, frame sizes PDA63S to 2-PDA90L, in 2 and 4 pole speeds.
High Torque Design: As above but with a higher starting torque of between 70% and 80% of full load dependent on frame size. Available in outputs from 0.37kW to 1.1kW, frame sizes 2-PDA80M and 2-PDA90L, in 4 pole speed.
Variable Voltage Speed Control Design: For use on variable voltage (thyristor) speed control such as fan applications. Available in outputs from 0.37kW to 1.1kW, frame sizes 2-PDA80M and 2-PDA90L, in 2 and 4 pole speeds.
Capacitor Start- EDA/TDA
Available in either Capacitor start/Induction run (EDA) design - vailable in outputs from 0.12kW to 1.5kW, frame sizes 2-EDA71M and 2-EDA90L, in 2 and 4 pole speeds, or Capacitor start/Capacitor run (TDA) design, available in outputs from 0.18kW to 3kW, frame sizes 2-TDA71M to 2-TDA100L, in 2, 4 and 6 pole speeds. Direct-on-line starting with any spot voltage between 200-500 volts available. High starting performances suitable for industrial and agricultural applications of a more demanding nature. Starting torque is between 160% and 300% of full load torque according to frame size. Clockwise or anti-clockwise rotation of the shaft is available by re-connection"
Maybe you need the to do the right connections and wire proper the motor.
Regards
Carlos
RE: Reverse 240V Motor
I think this puts a different spin on it.
So far I have reversed the Red and Black wires from the plug (A & A2). This was advised from another Forum during my searches.
I have also reversed the wires from the Capacitor, but left the other wires in place, this did not work, I then swapped the remaining wires from the terminal, this did not work either.
I then put these wires back to Original and then Swapped the Z and Z2 wires.
Maybe Im missing someting here.
For myself I would really love to know what I am doing wrong. You have me really curios.
If you want any more info, photos whatever I would be glad to upload for you.
Kindest regards,
Keith
RE: Reverse 240V Motor
I think that you have been told how to reverse the motor several times. The instructions were clear to those of us with motor experience but we seem to have forgotten that not everyone has our familiarity with motors.
You must reverse the starting winding.
Now, here's how to find the starting winding:
One end of the starting winding is connected to the start capacitor. Call this S1. Now disconnect S1 from the capacitor and use a continuity tester to find the other end. Disconnect and label the other leads one by one and check for continuity to S1. Be sure that you have continuity between S1 and only one other lead. Label the lead with continuity S2. Double check that there is continuity between S1 and S2 and NO OTHER LEADS. Interchange S1 and S2 and reconnect the capacitor (to S2 now). If there are no connection mistakes with the other leads the motor should now run backwards.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
Keith
RE: Reverse 240V Motor
Keith
RE: Reverse 240V Motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
The left hand of the lower terminals does not appear to be connected to anything, the middle one which is marked S is connected to something in the bowels of the motor ! Any help would be appreciated as I cannot figure out which is what in order to reverse the starter coil.
Cheers
David M
RE: Reverse 240V Motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
Any chance of uploading a photo of the terminal box interior to the engineering.com filehost? The option is just below the box you'll type a reply in. I'll see how it matches up to the FHP motor diagrams in the book.
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If we learn from our mistakes I'm getting a great education!
RE: Reverse 240V Motor
Cheers
David
RE: Reverse 240V Motor
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
RE: Reverse 240V Motor
The winding colours in your motor appear to be consistent with Brooks standard wiring code:
Run winding - red and black pair.
Start winding - yellow and blue pair.
The brass strip from AZ is likely one end of the connection to the centrifugal switch, and the other side of the switch returns on terminal S.
I've enlarged the Brooks diagram and marked up how I think your motor is internally connected. If you have a multimeter, you should find you have continuity between AZ and S when at rest. If you haven't then the switch might be sick - not an uncommon fault by any means, and not hard to fix. Be gentle when dismantling the motor!
Reversing is as per the diagram - swap the yellow & blue cores.
Hope this helps.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Reverse 240V Motor
David
RE: Reverse 240V Motor
I am new in this forum. Although, I've been reading various posts from this forum for quite some time now and I give kudos to everyone that has contributed immensely for a job welldone.
Thanks.
Victor(Micristos)
RE: Reverse 240V Motor
Welcome to the forum. I'm glad you find it useful and interesting. Speaking personally, it is little notes of thanks like yours and that from David above which make it all worthwhile. So thank you for your kind words.
----------------------------------
If we learn from our mistakes I'm getting a great education!
RE: Reverse 240V Motor
Thanks
Bill
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: Reverse 240V Motor
Slightly off topic but some motors such as small shaded pole without means of swapping the start winding can be reversed by taking off the end bells and swapping them around i.e. poking the shaft out the opposite end of the windings.
Roy
RE: Reverse 240V Motor
Sorry for the latency in my post, but here's my 2¢ anyway! ;)
I have many Motor Connection Drawings posted on-line at ECN, which may be of assistance to Members needing references.
In particular per this Topic, check out this page:
http://ww
This Page has Schematics of basic Forward / Reverse connections for Split Phase resistance Start Squirrel-Cage Induction Motors.
To view all the Drawing Page Links available, check out the Main Page:
http://www
Good luck to the OP!
Scott
BTW, I have attached an Image of a Single-Voltage 1 Phase S.C. Induction Motor connected for Clock-Wise ("Reversed") Rotation.
Eye Arrrgg an Injunear :)
http://setelectric.electrical-contractor.net