Near Intersection of I-35 & I-90 Southern Mn. | superfarmer - 2/13/2016 11:19
The latching relay is the really fun part. I set the control valve for inline servo. This gives me a 12V+ for both increase and decrease rate. The increase wire activates an isolation relay to keep power from feeding back to the module. That one sends power to the latch relay, which supplies power to the Duo-rate. I take power from the output side of the relay back to the positive side of the relay coil, thereby holding it on. The third relay is activated by the down rate signal, and breaks the ground of the latched relay's coil, thereby de-energizing it. Does that make sense to you? I set my high rate to be higher than the shaft speed sensor can turn so the controller will always want to be increasing the rate. Same with the low rate. By playing with the response threshold, the controller will only try to adjust the rate once before it is satisfied.
.
Ok that makes sense, I think I follow how you are feeding the output back to the input to keep the relay latched unless the other signal opens up another relay which causes the coil to lose power and de-energize it. You keep the Inc/Dec circuits active in their respective direction by having the target high rate higher than the drive can deliver and the low rate lower than the drive can deliver in the underdrive position. I don't quite follow how the response threshold enters into the picture. I was thinking that if the high is higher than can be obtained or lower than can be obtained that the system would give a continual warning about being out of range. Shutting off the audio alarm would silence that but I'm thinking that word warnings would still be present. |
On/Off output from Integra.
