|
||
|
30th October 2019, 19:49 | #21 |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
Location: Gävle
Posts: 2,528
Thanks: 395
Thanked 823 Times in 652 Posts
|
|
31st October 2019, 07:39 | #22 |
Gets stuck in
Rover 75 Saloon & Tourer, 9th & 10th Rovers Join Date: Nov 2013
Location: Sevenoaks
Posts: 973
Thanks: 670
Thanked 290 Times in 195 Posts
|
If I might come back in on this,
When I wrote the original txt, I had spoken to Engineering Carbon Products the previous day. They confirmed that they would now supply either 3 or 4 brushes per order, and I put that into the original text (message # 1) I confess that I didn't pay any attention to postal costs. However, further to the photographs of burnt out 2 speed fans, and the subsequent comments, I am no longer clear as to whether they (early 2 speed) are 3 brushes :- wired as (1) speed 1, (2) speed 2, and (3) common (12v supply or earth return?) or 4 brushes :- Wired as (1) a speed, (2 & 3) the other speed, and (4) common. Regards BRG75 (Mike)
__________________
Presently 2004 75 CDTi auto Connoisseur Tourer - White Gold 2001 75 2.5 auto Connoisseur Saloon - White Gold Previously 2002 75 1.8 auto Club SE, 2000 75 1.8 auto Classic SE (Company Car) 1997 420 (Company Car) 1996 216 cabriolet, 198? 213 VDP 1986 SD1 V8 VDP, 1968 2000TC, 1966 2000. |
31st October 2019, 07:54 | #23 |
Gets stuck in
Rover 75 Saloon & Tourer, 9th & 10th Rovers Join Date: Nov 2013
Location: Sevenoaks
Posts: 973
Thanks: 670
Thanked 290 Times in 195 Posts
|
I have just re-read the correspondence regarding burnt out fans, and realize that it is in fact quite clear, the 2 speed fans use 4 brushes, with two of them "doubled up".
Regards BRG75 (Mike)
__________________
Presently 2004 75 CDTi auto Connoisseur Tourer - White Gold 2001 75 2.5 auto Connoisseur Saloon - White Gold Previously 2002 75 1.8 auto Club SE, 2000 75 1.8 auto Classic SE (Company Car) 1997 420 (Company Car) 1996 216 cabriolet, 198? 213 VDP 1986 SD1 V8 VDP, 1968 2000TC, 1966 2000. |
31st October 2019, 08:17 | #24 |
I really should get out more.......
Rover 75 Saloon Join Date: Jul 2011
Location: Gävle
Posts: 2,528
Thanks: 395
Thanked 823 Times in 652 Posts
|
All fan motors that I've seen use four brushes, most unlikely that you'll need more than two brushes.
Regards |
31st October 2019, 10:23 | #25 | |
Doesn't do things by halves
Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007
Location: Former Middlesex
Posts: 20,344
Thanks: 1,587
Thanked 3,749 Times in 3,181 Posts
|
Quote:
I have never inspected a board from a 2 speed 2 wire system but I'm assured that this design uses a pair of brushes wired in parallel both on the positive supply and the earth. The speed reduction is, of course, achieved by switching in the resistor. Simon
__________________
"Whatever is rightly done, however humble, is noble." Sir Henry Royce. |
|
|
|