Overdrive relay question.
Hello everyone, I read a long time ago that the overdrive relay supplies a reduced amount of voltage to the overdrive solenoid to hold it in after the full 6 volts energizes it initially. If this is true, can anyone tell me what the reduced volatge actually is ? Thanks very much, Richie.
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Richie, what you are actully refering to is not a reduced voltage but a reduced amperage. The pull-in coil draws about 30 amps while the hold-in coil draws about 6 amps. Both operate on 6 volts. Hope this helps.0
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To help explain further, the relay supplies voltage to the primary (engagement) coil of the solenoid initially. Once the the solenoid engages with the slot in the drive mechanism, an internal relay inside the solenoid closes a pair of contacts to the "hold-in" coil, which operates on the reduced current, and opens the circuit to the engagement coil.
Geoff.0 -
Geoff, actually the two coils in the solenoid are energized at the same time, from the same terminal ('50 and later), but when the plunger pulls in, a set of contacts opens to de-energize the pull-in coil. The end result is the same of course. By the way, it looks like I've finally found a good modern 6v relay for these applications. It's the common 1" black cube with mounting tab attached, with 1/4" blade terminals. Contacts rated at 40A. $20 + mailing. I ordered two today and will post when I've checked them out.0
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YOu are right of course Park! The other set of contacts inside the solenoid provides a ground circuit to short out the distributor when the kick-down switch is activated. Should have studied the circuit before rushing into print! Richie - don't get confused by us technophobes. As "Aminard" explained, the same voltage applies to all circuits, just the current is reduced for the "hold-in" coil of the solenoid, to reduce the load. It needs a heavy current (amperage) to pull the solenoid in, but only a light current to keep it in. Park, I have used the type of relay you describe to drive the electric wiper motor I have adapted to fit my Jet. I have activated a micro-switch from the original cable, and that in turn puts voltage on to the relay coil, which provides the voltage for the wiper motor. I used this method because the micro switch only a 5 amp rating, and the relay was 20 amp. I note that the original overdrive relay has a heavy copper coil on top. Any idea what this is for?
Geoff.0 -
aminard wrote:Richie, what you are actully refering to is not a reduced voltage but a reduced amperage. The pull-in coil draws about 30 amps while the hold-in coil draws about 6 amps. Both operate on 6 volts. Hope this helps.
Thank you for that tidbit of information, I've been looking for the amperage of the solenoid.
So would it be safe to say, any 6 volt relay rated at 30+ amps would serve as an OD relay?
Mark0 -
Park W wrote:Geoff, actually the two coils in the solenoid are energized at the same time, from the same terminal ('50 and later), but when the plunger pulls in, a set of contacts opens to de-energize the pull-in coil. The end result is the same of course. By the way, it looks like I've finally found a good modern 6v relay for these applications. It's the common 1" black cube with mounting tab attached, with 1/4" blade terminals. Contacts rated at 40A. $20 + mailing. I ordered two today and will post when I've checked them out.
I'm a bit behind the ball here, I responded to an old view of this thread.
Thanks Park, I appreciate you finding a suitable relay.
One more question, would this relay also be offered in a normally closed version? I don't want to ground my Pertronix unit out with the kickdown switch, I'd rather just break the ignition circuit momentarily.
Mark0 -
aminard wrote:Richie, what you are actully refering to is not a reduced voltage but a reduced amperage. The pull-in coil draws about 30 amps while the hold-in coil draws about 6 amps. Both operate on 6 volts. Hope this helps.
aminard, thank you very much, that is what I was looking for. Richie.0 -
Geoff C., N.Z. wrote:To help explain further, the relay supplies voltage to the primary (engagement) coil of the solenoid initially. Once the the solenoid engages with the slot in the drive mechanism, an internal relay inside the solenoid closes a pair of contacts to the "hold-in" coil, which operates on the reduced current, and opens the circuit to the engagement coil.
Geoff.
Geoff C, thank you, I think I got it now !! Richie0 -
Park W wrote:Geoff, actually the two coils in the solenoid are energized at the same time, from the same terminal ('50 and later), but when the plunger pulls in, a set of contacts opens to de-energize the pull-in coil. The end result is the same of course. By the way, it looks like I've finally found a good modern 6v relay for these applications. It's the common 1" black cube with mounting tab attached, with 1/4" blade terminals. Contacts rated at 40A. $20 + mailing. I ordered two today and will post when I've checked them out.
Park W, that is good information, I'd like to know what you find after testing. Thanks, Richie.0 -
Hudsonator, the relay I've found is actually an SPDT (single pole, double throw) type, so you can use it for normally-open or normally-closed applications (or to switch a circuit from one path to another). It's exactly like some of the ones you see for add-on "driving lights" and such, with five terminals, but this one is designed to operate properly on 6v.
Geoff, I'll have to open up an original OD relay and see what that heavy coil looks like, then can maybe make a judgement on its purpose.0 -
Park W wrote:Hudsonator, the relay I've found is actually an SPDT (single pole, double throw) type, so you can use it for normally-open or normally-closed applications (or to switch a circuit from one path to another). It's exactly like some of the ones you see for add-on "driving lights" and such, with five terminals, but this one is designed to operate properly on 6v.
Geoff, I'll have to open up an original OD relay and see what that heavy coil looks like, then can maybe make a judgement on its purpose.
Thanks Park, that is exactly what I was looking for.
I hope your additional findings turn out positive and it becomes a piece we can use.
Mark0
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