Hello,
I have no information and am completely clueless when it comes to controllers. So, what do you need to make a NEMA cabinet. Only the basics to do a 4-way intersection with RYG n&s, RYG E&W, DW/W N&S, DW/W E&W, GY Arrow N&S, GY Arrow E&W.
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NEMA Cabinet
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NEMA Cabinet
by MarkIV on Sun Dec 16, 2012 9:52 am
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Carl Livingston
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Re: NEMA Cabinet
by coyttl on Sun Dec 16, 2012 10:08 am
Ah, don't worry about it. Many of us where in your shoes. Myself included. 
For basics, you need a backpanel (which has the loadswitches, where the lights connect up to), a controller, and a CMU unit. For making your own cabinet, that's the minimum.
That is for a TS1 type, too.. if you wanted TS2 or such, the basic requirements are the same, just in a different format. (i.e. Terminal & Facility Rack for loadswitches, MMU..)
--Me..
For basics, you need a backpanel (which has the loadswitches, where the lights connect up to), a controller, and a CMU unit. For making your own cabinet, that's the minimum.
That is for a TS1 type, too.. if you wanted TS2 or such, the basic requirements are the same, just in a different format. (i.e. Terminal & Facility Rack for loadswitches, MMU..)
--Me..
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Re: NEMA Cabinet
by TacomaJoe on Sun Dec 16, 2012 11:22 am
A NEMA controller has low voltage outputs. The loadswitches bump the controller outputs to 120VAC for the signals. The conflict monitor checks to be sure two greens aren't crashing into each other and transfer relays switch the signals to flash red.
The intersection that you described needs 12 loadswitches to run the 4 thrus, 4 lefts and 4 peds.
The intersection that you described needs 12 loadswitches to run the 4 thrus, 4 lefts and 4 peds.
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Re: NEMA Cabinet
by MarkIV on Mon Dec 17, 2012 4:59 pm
Is the CMU same thing as the conflict monidor.
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Re: NEMA Cabinet
by coyttl on Mon Dec 17, 2012 5:32 pm
Yes -
CMU - Conflict Monitor Unit, and
MMU - Malfunction Monitor Unit..
CMU - Conflict Monitor Unit, and
MMU - Malfunction Monitor Unit..
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Re: NEMA Cabinet
by MarkIV on Mon Dec 17, 2012 8:49 pm
Do you need a CMU chip for the CMU to function proberly
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Carl Livingston
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Re: NEMA Cabinet
by coyttl on Mon Dec 17, 2012 9:00 pm
MarkIV wrote:Do you need a CMU chip for the CMU to function proberly
Uh.. no.
See here. This is a manual to a popular CMU -
http://www.editraffic.com/opmanuals/SSM-LE_opman.pdf
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Re: NEMA Cabinet
by MarkIV on Mon Dec 17, 2012 9:13 pm
Would it be cheaper for me to buy an electro mechanical controller than to build an NEMA cabinet.
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Carl Livingston
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Re: NEMA Cabinet
by coyttl on Mon Dec 17, 2012 9:17 pm
MarkIV wrote:Would it be cheaper for me to buy an electro mechanical controller than to build an NEMA cabinet.
Honestly - probably. You can get some NEMA stuff cheap on eBay, but the biggest thing you'll need - the cabinet or backpanel - will cost you a couple hundred.
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Re: NEMA Cabinet
by MarkIV on Mon Dec 17, 2012 9:23 pm
coyttl wrote:MarkIV wrote:Would it be cheaper for me to buy an electro mechanical controller than to build an NEMA cabinet.
Honestly - probably. You can get some NEMA stuff cheap on eBay, but the biggest thing you'll need - the cabinet or backpanel - will cost you a couple hundred.
Oh dear god.
Well I think since I have a simple set up a Electro Mechanical controller would do good. NEMA cabinets seem better for complex set ups with 3 different left turns for Main ST and timers for every hour. 
what is the average coast of an Electro Mechanical controller? 
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