4/10/2022 6:56 AM | |
Joined: 3/30/2022 Last visit: 6/28/2024 Posts: 4 Rating: (0) |
Hi all. Looking to simulate/emulate a 4PDT relay for the purpose of running the old railroad relay circuits from the 50's and 60's. These were used to energize the signals used trackside red/yellow/green. These relays are the latching type DPDT up to 4PDT with some using a polarized contact (see diagram relay contacts just above the color signals) and some with just neutral contacts that do not depend on polarity. I need help in simulating the relays ONLY in a ladder diagram. I will try to figure out the whole circuit on my own but need help making the most efficient simulation of the relay itself as some of these circuits have hundreds of these relays. Attached is a simple circuit in use at the time. The relays are energized by the presence of 24 VDC connected by batteries across the track itself. The relays are then connected in various ways to protect the "blocks" so that trains do not enter these "blocks" at the same time causing a catastrophic event. Any help with a model of the relay itself would be appreciated. I Have seen a simple SPST ladder diagram but have had problems setting up a 4PDT ones. I'm sure there are some easier ways to do this using bit logic but I prefer the old fashioned connections first. Thx in advance for any help. Dan Attachment2022-04-09_17-01-01.pdf (581 Downloads) |
Last edited by: dak4482 at: 04/10/2022 06:57:44 |
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4/10/2022 6:58 PM | |
Joined: 3/30/2022 Last visit: 6/28/2024 Posts: 4 Rating: (0) |
Hi. Thx for the reply. First, the relay does not affect the block The presence or absence of the 24 volts from the block is what controls the relay. Second, The relays are used to control the selection of the red/yellow/green signal. Thats all. I basically want to change what I've seen as a single input latching switch (SPST) ladder that are shown in alot of tutorials to a 4PDT switch. Thats all. Dont need to worry about the complete circuit at all until I can get the switch inputs and ouput configuration correct. Attached is a diagram of what I see as a simple SPST latched circuit That would like to convert to a 4PDT circuit Hope this helps to clarify what I'm hoping to solve. Dan Attachment2022-04-10_12-55-02.pdf (584 Downloads) |
4/10/2022 8:10 PM | |
Joined: 12/18/2014 Last visit: 9/24/2024 Posts: 33833 Rating: (4205)
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Your diagram would I solve so. |
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