Lewmar st48 electric winch

[rogerthebodger]

I have been given 3 Lewmar st 48 24Vdc electric winch's but the motor is not the currant Lewmar winch motor with a worm gearbox.

The motor is Pacific scientific motor with 4 electric connection on the back end like the pic below

Does anyone know how to wire up this motor putting 12 Vdc onto the + (A1)and - (A2) does nothing so should the be power connected to the 2 insulated screw terminals.

Dos the motor reverse and if so how.

Thanks Guys for your help.

 

[DavidMcMullan]

The photo shows the motor is 24V DC.

 

[PaulRainbow]

Try A1 to positive and ground the case. It could be that A2 will reverse the motor, but the Lewmar winches that i've fitted do not reverse.

 

[PaulRainbow]

The photo shows the motor is 24V DC.

Roger states that in the first line of his post, i'm guessing he's just using a 12v battery to work out where the wires go.

 

[Moodysailor]

Try A1 to positive and ground the case. It could be that A2 will reverse the motor, but the Lewmar winches that i've fitted do not reverse.

The pic of the label states case ground, so I reckon you have solved it ?

 

[geem]

Wow! You must have some good friends. I wish somebody would give me one of those! Do you want to sell one?

 

[rogerthebodger]

Wow! You must have some good friends. I wish somebody would give me one of those! Do you want to sell one?

Its amazing what people throw out. I also have 6 boat heads in my shed. 2 Lavac and 4 jabsco thrown out when people upgraded to electric.

some time I will fix them up and convert then to electric and sell them.

Shipping to UK/EU would be more than thy are worth.

Note to self must stop dumpster diving.

We have a lot of cheque book sailors who will replace rather than repair

I was given a fuel sediment filter that was leaking from the drain point. I just reversed the rubber seal and it was fine.

 

[rogerthebodger]

OK Guys thanks for all the Info.

This morning I found my problem. The jumper leads I was using had an bad crimp so had an intermittent open circuit.

Once found that 2 of the motors worked by connecting plus to the A1 and negative to A2. Changing over the plus and negative the motor also ran in the reverse direction.

This may mean the winch could have a 2 speed direction in the same way a turning the winch handle in the opposite direction.

Still don't know what the 2 small screw connectors are for

I plan to strin the non working one to see if I can fix what's wrong, If not I have a local motor rewinder who will do DC motors and AC generators.

All I need now is to get the contactors to reconnect my 12Vdc batteries to drive the motor at 24Vdc.

The Vetus one is too costly and will not allow for a high current to 12Vdc windlass and bow thruster.

Thanks again for the help.

 

[PaulRainbow]

The Vetus one is too costly and will not allow for a high current to 12Vdc windlass and bow thruster.

I agree it's costly, but as it was designed for bow thrusters up to 11kw, it would work a winch, no problem.

 

[rogerthebodger]

I agree it's costly, but as it was designed for bow thrusters up to 11kw, it would work a winch, no problem.

Yes and when you consider 20 ZAR to a GBP that would make it getting on to 20 000 Rand which is one hell of a lot of South African beer tokens

Haven't worked out the details but I think 2 high current changeover relays/contactor of a 2 pole changeover relay.

 

[PaulRainbow]

Once found that 2 of the motors worked by connecting plus to the A1 and negative to A2. Changing over the plus and negative the motor also ran in the reverse direction.

This may mean the winch could have a 2 speed direction in the same way a turning the winch handle in the opposite direction.

If it's a 2 speed winch, it will still be two speed with a handle, but will only work one way/single speed in electric mode

Yes and when you consider 20 ZAR to a GBP that would make it getting on to 20 000 Rand which is one hell of a lot of South African beer tokens

Haven't worked out the details but I think 2 high current changeover relays/contactor of a 2 pole changeover relay.

Yes, i agree, far too much money. The Vetus switch has both batteries and the thruster connected to i t, charging from a 12v source is connected directly to one battery. You should be able to base something on the serial/parallel switch from the other recent thread, but simplify it. Or, is it worth considering a separate pair of batteries, wired in series and a DC-DC converter for charging ?

 

[rogerthebodger]

If it's a 2 speed winch, it will still be two speed with a handle, but will only work one way/single speed in electric mode



Yes, i agree, far too much money. The Vetus switch has both batteries and the thruster connected to i t, charging from a 12v source is connected directly to one battery. You should be able to base something on the serial/parallel switch from the other recent thread, but simplify it. Or, is it worth considering a separate pair of batteries, wired in series and a DC-DC converter for charging ?

Thanks Paul for you comments

If its only a single speed electric so be it, its better than grinding manually as they cost nothing.

As I said I have a plan and once I get to that point I will to some design and testing

I am going to try not to have a separate set of batteries but it it comes to that so be it.

I grew up designing relay logic systems before PLC's can in and then went onto electronics and Micro controllers but need to dust off the grey matter

 

[Neeves]

I do like it when a thread is resolved so quickly and amicably. Gives PBO real value

I am a bit worried as to why Roger is collecting heads (and what is he going to do with them all?)

Jonathan

 

[rogerthebodger]

I do like it when a thread is resolved so quickly and amicably. Gives PBO real value

I am a bit worried as to why Roger is collecting heads (and what is he going to do with them all?)

Jonathan

I do have this habit of collecting anything that may come in useful one day of collecting 2/3 broken items and making one good one and keeping the left over bits for spares.

I would rather buy a tool to do a job than pay someone to do the job for me. The only time I tend to pay someone if if I don't have time myself.

This may be it comes from my young days when we had to make do and mend. like fixing brothers discarded bicycle. My first car (a mini) had no exhaust when I got it and it was towed home to fit an exhaust made from bits of pipe and an old silencer box.

Mother used to darn socks when they had holes and knitting jumpers when it got cold.

Food rationing was still in operation when I was very young.

Old habits die hard.

 

[Neeves]

I do have this habit of collecting anything that may come in useful one day of collecting 2/3 broken items and making one good one and keeping the left over bits for spares.

I would rather buy a tool to do a job than pay someone to do the job for me. The only time I tend to pay someone if if I don't have time myself.

This may be it comes from my young days when we had to make do and mend. like fixing brothers discarded bicycle. My first car (a mini) had no exhaust when I got it and it was towed home to fit an exhaust made from bits of pipe and an old silencer box.

Mother used to darn socks when they had holes and knitting jumpers when it got cold.

Food rationing was still in operation when I was very young.

Old habits die hard.

Its a good habit and one I recognise. Similar background, my Grandmother used to knit my socks! I too recall rationing and the long trip on foot to obtain our orange juice ration, in the small rectangular bottle with the blue screw on cap. Some memories, (cod liver oil) as well as habits die hard.

Jonathan

 

[Graham_Wright]

The other terminals could not be for an internal relay could they? Maybe a temperature or overload sensor.

 

[rogerthebodger]

The other terminals could not be for an internal relay could they? Maybe a temperature or overload sensor.

Thanks Graham yes they could be. will have a look when I get inside the faulty one.

 

[yoda]

It could be possible that the motor is a bit more sophisticated than anticipated. I would be interested to know if putting positive on A1 and attaching the ground to the case does anything, firstly with no voltage applied between the 2 small terminals and then with a voltage applied. If there is an internal control solenoid it may be that reversing polarity on the control terminals causes either a different speed or direction. Need to do a few more tests to understand, things like resistance readings between terminals and ground and between terminals would help.

Yoda