I bought a 12 volts wiper motor (lucas-tvs.com/pdf/2sw60.pdf) and am trying to connect it to a 12 volts DC 4.2 amps power supply. There are 4 terminals on the motor. I'm confused regarding which terminals that I should connect the positive and negative ends of the power supply to. When I connect the positive and negative wires from the supply to the two leads on top side of motor terminal (circled in red in the first picture), the motor turns very slowly and I can observe the power supply LED flashing which indicates a voltage drop. Can anyone please help me with the connections ?



The video of the motor turning slowly and voltage dropping can be found here,

 

I believe that pdf has the wiring diagram but I can't read it - too blurry. Maybe you can search for a better copy?

 

Ciao,

the diagram in the datasheet is almost illegible, but I guess that the negative pole goes to the external metal case. So try the positive output of the power supply to one of the wires. Two of the four wires are for the two motor speeds, the other two should be a kind of limit switch? Without a proper datasheet it is impossible to tell. To avoid short circuits, please measure the resistance between the metal case and one of the candidate wires for the positive pole. You should read a very low value, around 1-2-3 ohm, but not zero.

A power supply with current limit should be used.

Best luck.

 

The chassis is Negative, the top two Blues are speed one Positive, speed two Positive, the Black and other Blue are for the self park mechanism.

 

Try connecting the power negative to the metal case of the motor and the positive to one of the red circled wires. One of them will give low speed, the other will give high speed. The other two connections are for the parking switch which can be wired so that when you switch the wipers off the motor will continue to turn until it reaches the park position.

 

I bought a 12 volts wiper motor (lucas-tvs.com/pdf/2sw60.pdf) and am trying to connect it to a 12 volts DC 4.2 amps power supply. There are 4 terminals on the motor. I'm confused regarding which terminals that I should connect the positive and negative ends of the power supply to. When I connect the positive and negative wires from the supply to the two leads on top side of motor terminal (circled in red in the first picture), the motor turns very slowly and I can observe the power supply LED flashing which indicates a voltage drop. Can anyone please help me with the connections ?

View attachment 121443 View attachment 121444

The video of the motor turning slowly and voltage dropping can be found here,

It sounds like 4 Amps isn't enough. What is the fuse for the wiper in your car rated t?

 

It sounds like 4 Amps isn't enough. What is the fuse for the wiper in your car rated t?

The power was connected incorrectly so the motor may have been drawing more than it would normally. Your comment applies if the voltage still drops with the power connected correctly.

 

The chassis is Negative, the top two Blues are speed one Positive, speed two Positive, the Black and other Blue are for the self park mechanism.

Followed your instructions. Connected GND to the chassis. When I connected the right top blue one (circled in red in the initial picture I posted) to positive, the motor started rotating well at a decent speed (around 45rpm). But, when I connected the left top blue (circled in red in the initial picture I posted)one to positive, the voltage starts dropping and motor starts turning slowly (exact same behavior in the video posted above). Do you think this left side top blue wire is for something else like the switch ?

Another question I had was, is it ok if reverse the positive and negative wires so that the motor can turn in the reverse direction ?
Note: I haven't connected the park switch wires to anything

 

The power was connected incorrectly so the motor may have been drawing more than it would normally. Your comment applies if the voltage still drops with the power connected correctly.

I followed dodgydave's instructions. Connected GND to the chassis. When I connected the right top blue one to positive, the motor started rotating well at a decent speed (around 45rpm). But, when I connected the left top blue one to positive, the voltage starts dropping and motor starts turning slowly (exact same behavior in the video posted above).

 

It may be that the right top is low speed, and the current drawn is within what the power supply can manage but the left top one is high speed and then the motor tries to draw more current but the supply voltage collapses. You need a better supply or a car battery, that can supply enough current.

 

It may be that the right top is low speed, and the current drawn is within what the power supply can manage but the left top one is high speed and then the motor tries to draw more current but the supply voltage collapses. You need a better supply or a car battery, that can supply enough current.

Thank you for the reply. I'll check with a power supply which has higher amperage. I just wanted to make sure that I'm not connecting the wrong way again and hence damaging the motor, as the datasheet (http://www.lucas-tvs.com/pdf/2sw60.pdf) says 2.5 amps during high speed and I am using a 4.2 amps supply.

Also, is it ok if reverse the positive and negative wires so that the motor can turn in the reverse direction ?

 

For Fast speed connect Both Blue wires together.

It won't be possible to reverse the motor with the gearbox connected, it will run backwards but may jam.

 

Also, is it ok if reverse the positive and negative wires so that the motor can turn in the reverse direction ?

Probably. There might be a problem with the switch cam in reverse.
I used a wiper motor to motorise my garage door and it didn't reversing.

 

For Fast speed connect Both Blue wires together.
It won't be possible to reverse the motor with the gearbox connected, it will run backwards but may jam.

Firstly I would like to thank you for all the help so far.

I managed to short those two blue wires on the top and the motor speed seemed to have increased by approx another 9-10 rpm (from 45 rpm previously). Please see the video below:

Is this the maximum speed at which these motors can turn or is it possible to turn them faster ?

And out of curiosity and for my knowledge , why did I have to short those wires together for it to work and why dint it work when I tried connecting just the left side terminal which is also meant for individual speed control?

 

That looks about right for wipers - one rotation equals across and back for the wipers.
The actual motor turns faster than that but there is a large reduction gearing inside (a worm gear in all the ones I have had apart) which reduces the speed but increases the torque for driving the wipers.

 

Firstly I would like to thank you for all the help so far.

I managed to short those two blue wires on the top and the motor speed seemed to have increased by approx another 9-10 rpm (from 45 rpm previously). Please see the video below:

Is this the maximum speed at which these motors can turn or is it possible to turn them faster ?

And out of curiosity and for my knowledge , why did I have to short those wires together for it to work and why dint it work when I tried connecting just the left side terminal which is also meant for individual speed control?

Because most wiper motors have three brushes, one common and two for speed, one is the primary run coil, the second increases the current by putting the second winding in parallel, thus making it faster.

 

Because most wiper motors have three brushes, one common and two for speed, one is the primary run coil, the second increases the current by putting the second winding in parallel, thus making it faster.

Thank you. So, when I had initially connected the primary coil to positive , the motor did rotate normally. But when I did connect the secondary the second time in place of primary , the motor dint turn normally as the primary wasn't energized (because the secondary works by putting its coil parallel to the primary which has to be energized) . What will happen if I connect the positive to the primary and negative (instead of chassis) to the secondary or vice versa ?