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Discuss Help with small lifting motor wiring? Where does the other end of this resistor go? in the Electrical Appliances Forum area at ElectriciansForums.net
Could be a discharge resistor for the capacitor.
Nearly there the start winding needs a change to reverse.As a sufficient quantity of cold drink has now been consumed to make me bold, I'm going to hazard a guess :
This is a single phase induction motor with 2 windings, one start one run. The capacitor is used to create the starting field to make the rotor spin. Changing which coil has the cap connected reverses the spin. A low value R (as this seeems to be ?) can be misused in place of the C to create a lopsided field and get the rotor to start. This is just a thought and could be all rubbish
To what end. As I surmise to reduce the torque?I don't think it's a cap bleed resistor, it's the wrong type and value. It's a high power resistor that's designed to dissipate heat so it shouldn't even really be in that connection box. I'd guess it comes from either the top terminal or the third one down as you look at the photo depending on which direction you want the motor to run. I'd emphasise this is a guess so don't blame me if there's smoke....
The diagram is definitely incorrect in that respect.My question stands though... how can you make the motor run and change direction with only two wires to the directional switch? There appears to be a wire missing from the diagram.
Unless it is only cap start in which case start up torque is reduced then it plays no part.We'll probably never know why but maybe torque or speed limitation. Either way that resistor is likely to get pretty warm.
The writing say up/down but it's wired as an on/off switch. I ignored the writing.....That was my thought as well. But if the diagram is correct, the cap would then only have one connection outside the discharge resistor. I'm also curious about the up/down switch as I don't see how you can achieve up/off/down (which I'm assuming is the operation) with only two wires.
Anything is possible but it doesn't look like a CSIR motor. It would need either a current operated relay in the connection box or a centrifugal switch on the back of the motor so it's unlikely.Unless it is only cap start in which case start up torque is reduced then it plays no part.
Thank you for all your help I think 'distressed' is too kind! Think a visit to my local motor electrician is in order!!
Me too , look closely at switch ......Curious about the up/down switch as I don't see how you can achieve up/off/down (which I'm assuming is the operation) with only two wires.
Me too , look closely at switch .
Resistor a bit small to discharge cap , but reduce speed in one direction ?
( No liability accepted for BAD advice )
If it's a stepper motor then I can't help, but if it's a single phase induction motor I have a thought, for what it's worth.
I think the R was in series with the C and they are used to create the phase shift in the 2nd motor winding needed to start it. (It looks like a diy mod - not happy ...). So the floating R wire should be attached to the top brown wire that goes to the switch. I've attached a diagram of what I've in mind. Please remember this is a 230V motor and the wiring is clearly in a distressed state and not suitable for use, in my humble opinion.
View attachment 36918
Just revealing "GUT" feeling part of Fault finding process for others to see ...It's not using only 2 wires, the OP had missed out a Blue wire in his original diagram.
it must be to power, as the capacitor must have a feed, I can only think its to smooth the supply ,
Reply to Help with small lifting motor wiring? Where does the other end of this resistor go? in the Electrical Appliances Forum area at ElectriciansForums.net
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