Help with small lifting motor wiring? Where does the other end of this resistor go?

[Marvo]

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....

 

[SparkyChick]

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.

 

[westward10]

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

Nearly there the start winding needs a change to reverse.

 

[westward10]

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....

To what end. As I surmise to reduce the torque?

 

[Marvo]

We'll probably never know why but maybe torque or speed limitation. Either way that resistor is likely to get pretty warm.

 

[westward10]

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.

The diagram is definitely incorrect in that respect.

 

[westward10]

We'll probably never know why but maybe torque or speed limitation. Either way that resistor is likely to get pretty warm.

Unless it is only cap start in which case start up torque is reduced then it plays no part.

 

[Marvo]

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.

The writing say up/down but it's wired as an on/off switch. I ignored the writing.....

 

[Marvo]

Unless it is only cap start in which case start up torque is reduced then it plays no part.

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.

 

[Osteo1]

The diagram is definitely incorrect in that respect.

Yep sorry please see additional blue wire added from the switch to one of the capacitor connections at the block
additional photos...

 

[Osteo1]

 

[Osteo1]

 

[Osteo1]

Oh and resistor has now snapped off so I definitely need to replace it HELP!!

 

[Wilko]

If I'm reading the diag correctly - the cap is presently not effectively connected (?) implying the R is used in series to connect it (?) possibly to the top brown wire that goes to the switch. To avoid smoke, the next step is to understand the switch

 

[Osteo1]

'runs off to dismantle switch'......