Re: car battery and windshield wiper motor
- From: "Chris" <cfoley1064@xxxxxxxxx>
- Date: 14 Apr 2005 21:20:02 -0700
Pat Kilgore wrote:
> Thanks everybody for the replies. That's more than I knew about
> batteries put together already
> What we have used in the past to control timing and switching is time
> delay relays. http://www.ssac.com/catalog/TDR01A01.pdf(tdr1b12 is the
> one i would use here) With this one current is always on and the
timer
> switches the relay on and off. Little pricey at fifty bucks but I
didn't
> see a switch timer combo I could use hooked up to a 12 volt battery
at
> allelectronics.com. I know squat about reading the specs on switches
and
> cam microswitches, etc. You think I could do a lot better than $50?
>
> Pat
Hello again, Pat. SSAC makes very good products. I would guess you
can save at least half of that $50 by doing a home brew, but given your
level of electronics expertise, buying a packaged solution and avoiding
the hassle might be worth the extra $30.
One question: You said you need one cycle every 10 minutes. What do
you mean by that? I guess I assumed in your OP you meant you needed
precisely 1.00 revolution of the motor. If not, the SSAC relay is a
great idea. If you need the motor to stop at the same place every
time, you're going to need a better solution, particularly a cam on the
motor shaft and a microswitch to sense the cam bump to stop the motor.
At least you don't have to worry about the power supply.
(By the way, I don't believe there's reverse-polarity protection on
those Solid State interval timers. If it's possible to reverse-connect
the battery terminals, you should think about using a protection diode
to keep from smoking your SSR. It's shown as "D" below. Use a 1N4002
for D, and a 1N5402 for D2 if the motor uses less than 3 amps.)
`
` + Battery -
` o o
` | Microswitch |
` | (Use N.C. Contact) D2 |
` | .---|<----o
` | -o | |
` | __--o-----------o _ |
` o------o | / \ |
` | o--( M )--o
` | | \_/ |
` | .-------------. | |
` | 1| |3 | |
` o----oRLY RLYo---' |
` | |COM SSR N.O.| |
` | 2| Timer |7 |
` o->|-o+ -o-------------o
` | D | | |
` | '-------------' |
` | |
`created by Andy´s ASCII-Circuit v1.24.140803 Beta www.tech-chat.de
Every ten minutes or so, your SSAC TDR1B12 timer will close the relay
contacts for about 0.3 second, long enough to turn on the motor and get
the motor shaft cam off the microswitch. Since the N.C. microswitch
contact will now allow power to go to the motor, it will continue to
run until the motor comes around, and the cam pushes on the microswitch
again, removing power from the motor. D2 is necessary to absorb the
inductive kick of the motor when the microswitch turns it off. If you
don't have it, you'll get an arc on the microswitch which will reduce
its life. Simple & easy. Heck, windshield wipers used to be wired up
with a microswitch this way, except the dashboard wiper switch was used
instead of the SSR. That way the wipers would always stop down.
Post again if you've got more questions.
Chris
.
- References:
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- From: Pat Kilgore
- Re: car battery and windshield wiper motor
- From: Chris
- Re: car battery and windshield wiper motor
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