So with the extra circuits (compared to my Type F) these controllers would have enough circuits for left turn clearance in both directions?? Would that be a typical setup for the EF-20?? Can ped buttons be connected to this controller, or is it pretty much the rule that you can't use them on an E/M controller.
The limit on these is more the 12 intervals rather than the number of circuits. A 2 phase with peds uses 8 intervals, leaving only 4 more.
Ped buttons or vehicle detectors can be hooked up to these. One way is to stop the dial on the R1 key in main street green and wait for the actuation to break the R1 circuit. Another is to open the GRN (release) key and the cam will stop on main street green waiting for detection to close the release circuit. Keep in mind that peds and vehicles work the same intervals so you can't get a vehicle without the ped unless there are more relays involved.
What do you normally do with the retired electro-mechanical signal controllers?
We retired about 30 of them in 1999-2000. The cabinets were repurposed as tool lockers or such or ended up in the metal salvage. We have maybe 10 of them around the shop still, saving them for parts. When these last 10 are out of service, we won't have any need for parts and they will be surplused out. City rules prevent me from "stealing" them, including dumpster diving. I have skirted the rules at times and traded say an old hot water heater for an equal weight of signal junk. New city manager is on a massive surplus campaign to clean up the city so we'll see what that means to our shop.
tell me when to shut up!!
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