Re: Continuing on the Overdrive
Posted by HH56 On 2009/8/27 14:33:27
Here is a bit more to add to the mix.
R9 Relay operation: There is a bit of description in the manual but maybe this will flesh it out--or confuse issues further.
Power is supplied to terminal 1, thru first relay coil & out terminal 5. Thru closed lockout switch, closed kickdown switch and gets ground when car reaches speed.
First relay energizes and provides power to term 4, solenoid pull in coil and indicator light. Indicator will light as solenoid still not fully engaged and light contacts are closed. At the same time first relay opens the contacts tied to terminal 2. Power is also supplied to and thru the coil of second relay and out terminal 3 to hold coil. Since they are in series, second relay closes contacts tied to terminal 6 and hold coil now has power and will prevent the machine gunning.
When you let off the gas, engine torque is released, and solenoid fully engages. Pull in coil contacts open that circuit. Indicator light contacts open, extinguishing light, but engine kill contacts now close at 6. Engine is not affected though because kill circuit goes thru term 6, closed second relay contacts but no further because first relay contacts are now open so can't exit on term 2 and get to distributor. This is the state of things as long as you are in overdrive.
When you exit overdrive via kickdown, that switch opens dropping out first relay and power to solenoid. Solenoid can't release until torque released so kill circuit is now completed by previously open first relay contacts at 2 and engine skips a beat until solenoid drops out and opens that set of kill contacts. Just before it opens the kill contacts it closes pull in coil contacts. The second relay will drop out because it also lost power but because it's coil is now in series with pull in coil & hold coil, will have a slight delay of a few milliseconds until everything quiets down. There is a bit of a race as to which contacts opens first but once open it ensures kill circuit is open in case of a bind at solenoid and engine can continue running.
When OD is in lockout, nothing can be energized when governor reaches speed because ground never reaches relay.
Attach file:
(61.80 KB)
R9 Relay operation: There is a bit of description in the manual but maybe this will flesh it out--or confuse issues further.
Power is supplied to terminal 1, thru first relay coil & out terminal 5. Thru closed lockout switch, closed kickdown switch and gets ground when car reaches speed.
First relay energizes and provides power to term 4, solenoid pull in coil and indicator light. Indicator will light as solenoid still not fully engaged and light contacts are closed. At the same time first relay opens the contacts tied to terminal 2. Power is also supplied to and thru the coil of second relay and out terminal 3 to hold coil. Since they are in series, second relay closes contacts tied to terminal 6 and hold coil now has power and will prevent the machine gunning.
When you let off the gas, engine torque is released, and solenoid fully engages. Pull in coil contacts open that circuit. Indicator light contacts open, extinguishing light, but engine kill contacts now close at 6. Engine is not affected though because kill circuit goes thru term 6, closed second relay contacts but no further because first relay contacts are now open so can't exit on term 2 and get to distributor. This is the state of things as long as you are in overdrive.
When you exit overdrive via kickdown, that switch opens dropping out first relay and power to solenoid. Solenoid can't release until torque released so kill circuit is now completed by previously open first relay contacts at 2 and engine skips a beat until solenoid drops out and opens that set of kill contacts. Just before it opens the kill contacts it closes pull in coil contacts. The second relay will drop out because it also lost power but because it's coil is now in series with pull in coil & hold coil, will have a slight delay of a few milliseconds until everything quiets down. There is a bit of a race as to which contacts opens first but once open it ensures kill circuit is open in case of a bind at solenoid and engine can continue running.
When OD is in lockout, nothing can be energized when governor reaches speed because ground never reaches relay.
Attach file:
(61.80 KB)
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