Need help with Summit RPM switch
05-11-07, 06:52 PM
#1
Need help with Summit RPM switch
So I got 2 summit rpm switches for operating my VDI/aux ports. The air pump I am using pulls about 4 amps and the rpm switch is only rated to 2 amps so I got a relay.
Now here is my problem: the rpm switch puts out a ground to trigger the device but the relay needs a 12V switched source to know when to trigger on. I know people have used this before, so how did you get around this? Preferably it would be using devices that one can obtain on the weekend since I want to get this done tomorrow.
Thank you in advance.
Now here is my problem: the rpm switch puts out a ground to trigger the device but the relay needs a 12V switched source to know when to trigger on. I know people have used this before, so how did you get around this? Preferably it would be using devices that one can obtain on the weekend since I want to get this done tomorrow.
Thank you in advance.
05-11-07, 07:20 PM
#2
Former Moderator. RIP Icemark.
ground trigger from the rpm switch to pin 85 of the aftermarket relay,
12volts on 86 and 87 of the relay
30 of the relay is the positive trigger to the pump
12volts on 86 and 87 of the relay
30 of the relay is the positive trigger to the pump
05-11-07, 07:39 PM
#3
Yeah I already though of that, but wouldn't the current still be going through the RPM switch since it is the only ground to the relay?
I'll go test it out real quick and check to make sure.
Edit: well hot damn, that does work. I guess I should have tested it out with the meter first. Anyway, thanks for telling me to try it Icemark!
I'll go test it out real quick and check to make sure.
Edit: well hot damn, that does work. I guess I should have tested it out with the meter first. Anyway, thanks for telling me to try it Icemark!
Last edited by Sideways7; 05-11-07 at 07:45 PM.
05-11-07, 08:52 PM
#5
Well, the problem was that I thought it would pull the whole 4 amps through the ground wire. What actually happened was that it only pulled the 180 mA for the relay through the ground wire, so it works fine.
Now I have a new problem, though. Even when I set it on 2k rpm as the trigger, it doesn't activate until over 5k rpms. I hooked it up to the yellow/blue wire on the trailing coil since thats where aaron said to put it on a thread I found. Is this not right, or it just just not possible to get it to trigger lower than that?
Now I have a new problem, though. Even when I set it on 2k rpm as the trigger, it doesn't activate until over 5k rpms. I hooked it up to the yellow/blue wire on the trailing coil since thats where aaron said to put it on a thread I found. Is this not right, or it just just not possible to get it to trigger lower than that?
05-11-07, 08:54 PM
#6
Former Moderator. RIP Icemark.
180mA from a relay coil is pretty high... should be closer to less than 50mA
and as I recall when I last used one I had to crank the settings to a lowest possible to get a 5200 RPM trigger
and as I recall when I last used one I had to crank the settings to a lowest possible to get a 5200 RPM trigger
05-11-07, 09:06 PM
#7
Well, the listed nominal current is 160 mA, so its close enough. Its a monster 30A automotive relay, which could be why it pulls so much. I just got it because its what I found at radio shack on short notice.
Also, what do people do for activating the aux ports if the lowest it will go is 5200?
Also, what do people do for activating the aux ports if the lowest it will go is 5200?
Trending Topics
05-11-07, 09:19 PM
#8
Rotary Freak
Join Date: Dec 2006
Location: New Hampshire
Posts: 1,791
Likes: 0
Received 0 Likes
on
0 Posts
be carefull with the summit switches. Atleast the one I used, ramped up the voltage to the 12v 30a relay I was using for the aux ports and kept making it stick. I always had to open up the relay and fix it. If I hooked a multimeter up to the switch, you could see the volts climb from 0v-12v as it came close to the triggered RPM.
After I switched to a MSD and never had a problem.
wher the DIP switches are, flip the one for 3000 and the one for 800 or 600, if you are using it for AUX. Look directly across the board (if they havn't changed the design) and you will see a rotary dial that says "Adjust" printed on the board. Turn that to fine tune the RPM set point. I noticed the dip switch for 9000 was also flipped when looking at my switch that I took out of my tool chest. I don't know if I did that or if it flipped by its self from getting bumped around for years. Don't see a reason why I would have flipped both, 3000 and 9000.
Like I said above, be aware that your switch may also ramp up the voltage.
After I switched to a MSD and never had a problem.
wher the DIP switches are, flip the one for 3000 and the one for 800 or 600, if you are using it for AUX. Look directly across the board (if they havn't changed the design) and you will see a rotary dial that says "Adjust" printed on the board. Turn that to fine tune the RPM set point. I noticed the dip switch for 9000 was also flipped when looking at my switch that I took out of my tool chest. I don't know if I did that or if it flipped by its self from getting bumped around for years. Don't see a reason why I would have flipped both, 3000 and 9000.
Like I said above, be aware that your switch may also ramp up the voltage.
Last edited by RotaMan99; 05-11-07 at 09:31 PM.
05-11-07, 09:27 PM
#9
This is just a temporary solution. I am going to make my own RPM switch from scratch but I don't have the time or money to do it at the moment. The one I make will be fully programmable allowing for a hysteresis to avoid fluttering and to allow for a more optimal operation of the air pump.
There are directions on the globalvicinity.com vdi activation page.
There are directions on the globalvicinity.com vdi activation page.
05-12-07, 08:02 AM
#10
Who are you?
Join Date: Mar 2003
Location: CenCal
Posts: 2,235
Likes: 0
Received 0 Likes
on
0 Posts
I plug my RPM switch in the Green plug buy the coil, Its a rounded shaped female connector. Switch activates at 3800 rpm after adjusting it. Lemme know if you need pics, I can probably takes some fior ya sideways!!
05-12-07, 11:52 AM
#11
Which coil? I see an unused female bullet connector on the leading coil. Is that what you are talking about? I can't tell the color due to age. And yes, pics would be great.
Also, I assume that you got it to work with the summit switch, right? If so, what rpm setting did you use?
Also, I assume that you got it to work with the summit switch, right? If so, what rpm setting did you use?
05-12-07, 05:03 PM
#12
For the record, the connectors on both the leading and trailing coils DO send out the same signal. The way to get it to trigger lower is to turn the adjustment screw almost all the way counter-clockwise. I would have tried it earlier except I though it was for fine adjustments, not huge adjustments.
05-13-07, 05:42 AM
#15
Rotary Freak
Join Date: Dec 2006
Location: New Hampshire
Posts: 1,791
Likes: 0
Received 0 Likes
on
0 Posts
Ya I didn't have to adjust it that much. I suppose you could set it for 2800 and see what happends. Maybe the adjustment would be closer to the actual RPM set point.
05-13-07, 07:44 PM
#17
Who are you?
Join Date: Mar 2003
Location: CenCal
Posts: 2,235
Likes: 0
Received 0 Likes
on
0 Posts
Sorry about that man(I did take those pics though) but yea thats how I adjusted it to 3800 using a potentiometer!! BTW the green plug was used for the power to the rpm switch. Its the white bullet female connector that I used for the RPM signal.
Chris
Chris
05-13-07, 08:41 PM
#18
HAILERS
Join Date: May 2001
Location: FORT WORTH, TEXAS,USA
Posts: 20,563
Likes: 0
Received 21 Likes
on
19 Posts
Been there, done that a few years ago on this thread: https://www.rx7club.com/forum/showth...ghlight=SUMMIT
See HAILERS about three quarters down the first page of it.
See HAILERS about three quarters down the first page of it.
05-14-07, 12:35 AM
#20
Strength and Honor
Join Date: Apr 2006
Location: CA bay area
Posts: 391
Likes: 0
Received 0 Likes
on
0 Posts
Instructions: http://howto.globalvicinity.com/gv_w...i=38&co=1&vi=1
05-14-07, 06:55 AM
#21
Rotary Freak
Join Date: Dec 2006
Location: New Hampshire
Posts: 1,791
Likes: 0
Received 0 Likes
on
0 Posts
^ Not an RPM switch Article, An article about configuring the Summit RPM switch.
I used to have pictures of mine. I don't know what happen to them. Im probubly going to sell mine for $5 on ebay. Since I think they are only worth that much
I used to have pictures of mine. I don't know what happen to them. Im probubly going to sell mine for $5 on ebay. Since I think they are only worth that much
05-14-07, 02:36 PM
#23
Strength and Honor
Join Date: Apr 2006
Location: CA bay area
Posts: 391
Likes: 0
Received 0 Likes
on
0 Posts
05-14-07, 06:08 PM
#25
BTW, the RPM switch I was talking about making is basically the one on your site, Steve. I'm gonna have to take the time to really look at it, but I Think I can modify the code to do what I want.
The inherent problem with this is that the air pump can't run forever. I have seen it said that it overheats and shuts down until it cools off after around 4 minutes of continuous use. While not usually over 3800 for that long, I have done it on occasion. The cool thing about this pump is that it is designed to hold in air pressure since it is used to control the size of an air bladder. Without going into detail, there is a way to run the pump for a few seconds to open the VDI/aux ports then turn off the pump but keep the air pressure locked in, then let the air pressure out once below the set rpm. Now all I have to do is to figure out a way to control it the way I want too. I have some ideas, but I haven't had the time to pursue them lately due to work loads.