Vetus wiper wiring problem

[pompeydave]

Hi all, I've just added two wiper motors, arms and blades to my Raider 18. I now have three identical Vetus motors all running through a new single Vetus two speed switch which is the correct one for the motors. My problem is that although the wipers all come on perfectly well and will switch to the faster second speed also, when I turn the switch to the off position the wipers keep going and will only stop if I cut the power from the main supply. Each wire from each motor is wired in together correctly i.e. 1,1,1, 2,2,2, 3,3,3, G,G,G. Does anyone have any idea what could be wrong please?

 

[pvb]

I'd guess that the wipers are not all operating in sync, so the self-parking switch is being over-ridden by another motor's switch. The self-parking switch in the motor is in connection 1, and allows the motor to keep going until the end of its arc. Not sure how you could fix this - maybe diodes?

 

[pompeydave]

Yes, I wondered if the self parking circuit was the problem. Just occasionally they will suddenly stop and I think it might be thats because they synch up briefly allowing all three to stop at the end of a sweep. I suppose the way to test the theory is to disconnect two motors and see if the remaining one self parks on its own ok.

 

[rogerthebodger]

This is a typical circuit for a self parking wiper motor.

Where you have 3 driven from the same switch you need a separate contact in the high and low power supply to each motor otherwise you will get power feed from one motor park contact to another as pvb said.

A way to solve this is to have a relay between the operation switch and each motor with a seperate relay contact for each motor

 

[pompeydave]

Ah right, many thanks for that. I'm not all that well clued up on electrics but I think I see what you're saying. So if I source 3 x 12v marine grade relays and wire them in between the operation switch and each motor, they *should* run independently and self park?

 

[pvb]

So if I source 3 x 12v marine grade relays and wire them in between the operation switch and each motor, they *should* run independently and self park?

I don't think that would work.

 

[rogerthebodger]

You only need a single relay with 3 seperate poles one pole for each motor.

You may need a second to the high speed motor feed dependent on the exact wiring of the motor.



I generally use a 11 pin relay like this with a plug in base.

 

[pvb]

You only need a single relay with 3 seperate poles one pole for each motor.

You may need a second to the high speed motor feed dependent on the exact wiring of the motor.

How exactly would you wire this relay?

 

[rogerthebodger]

This is another way that self parking wipers are wired.

This shows a 2 pole 3 position switch and if I remember correctly the vetus switch is single pole 3 position.

Vetus is the type of wiper switch I have

 

[pvb]

Yes, I wondered if the self parking circuit was the problem. Just occasionally they will suddenly stop and I think it might be thats because they synch up briefly allowing all three to stop at the end of a sweep. I suppose the way to test the theory is to disconnect two motors and see if the remaining one self parks on its own ok.

Your simplest solution, as I suggested in post 2, is to use diodes. You need to insert a diode with around 5A capacity in each of the wires between the B terminal of the switch and connection 1 on the second and third motors. After the first motor self-parks, the other two motors will each self-park.

 

[rogerthebodger]

Your simplest solution, as I suggested in post 2, is to use diodes. You need to insert a diode with around 5A capacity in each of the wires between the B terminal of the switch and connection 1 on the second and third motors. After the first motor self-parks, the other two motors will each self-park.

That's another way of doing the same think as with a relay.

 

[pvb]

[Content removed]

No, that wouldn't work. The motors are continuing to run through the self-park circuit after power has been removed from either the slow-speed or high-speed connections. Feeding those slow-speed or high-speed connections via a relay won't achieve the desired result.

Oh, and I'd remind you of the forum's ruling on Civil Public Discourse - https://forums.ybw.com/index.php?threads/please-read-now-civil-public-discourse-14-09-2020.549345/

 

[pvb]

That's another way of doing the same think as with a relay.

It isn't. It's the way to stop voltage feeding back from one self-park circuit to another self-park circuit.

 

[rogerthebodger]

No, that wouldn't work. The motors are continuing to run through the self-park circuit after power has been removed from either the slow-speed or high-speed connections. Feeding those slow-speed or high-speed connections via a relay won't achieve the desired result.

Well I know it will as I have done this more times than I wish to remember.

If as you say my solution will not achieve the desired result please explain in detail so the OP and others can understand why it wont work.

Oh, and I'd remind you of the forum's ruling on Civil Public Discourse - https://forums.ybw.com/index.php?threads/please-read-now-civil-public-discourse-14-09-2020.549345/

I am sure if I have contravened this forum's ruling the moderator will contact me or maybe you have already reported me so we will see.

 

[RichardS]

No, that wouldn't work. The motors are continuing to run through the self-park circuit after power has been removed from either the slow-speed or high-speed connections. Feeding those slow-speed or high-speed connections via a relay won't achieve the desired result.

That is correct. I've just opened up the wiper motor control on an ancient Lucas wiper motor because it had stopped self parking and stopped fast wiping. Once I had opened it up and worked out how it works, I was able to reconfigure it with new wires so I have slow and fast action and can, at least, park it manually.

Richard