I am the engineer for a small HOA that owns/manages a 40 acre lake with 6 sluice gates. The sluice gates were installed to prevent the operation/destruction of the flashboard system originally installed to provide an elevated reservoir level. I need to find a logic controller that will receive input from the level sensors and raise the gates a set amount than wait a set time before raising or lowering the gates. I am trying to maintain this reservoir at a level that will not allow more than 6 inches over the gates. I can install magnetic reed switch level sensors in a dampened level container to detect the reservoir level. I must keep this system simple. I was considering a timer switch that would connect when the level sensor closed and operate the gate actuator for 60 seconds than wait 5 monutes then if the level sensor was still closed operate the actuator another 60 seconds than wait 5 minutes. This system has 2ea 6ft gates with actuators then 4ea 4 ft gates with one actuator controlling 2 gates. I would want to operate the 6 ft gates first then the 2ea 4 ft gates. I am trying to maintain a balanced outflow as the gates are installed on each side of the spillway. Therefore needint 2 controllers. There is 120/240 single phase power at each site. Do I need a logic relay or a logic controller? Where can I obtain some fast and simple training to program this if needed? I am a retired consultant and have an above average computer knowledge, but also a below average threshold of frustration!!!
I would apreciate any recommendations. I have wanted to try PLC's for years but do not know where to start.
Thanks in advance!
Hello - try taking a look at the 646-1115-ND plc logic controller. Six digital inputs for you to use to monitor your float switches and 4 relay contact outputs to control your sluice gate motors. Though you may need more outputs depending on if the motors for the sluice gates need to be reversed to move the gate in the opposite direction. The controller runs on anything from 100-240VAC single phase and mounts on standard DIN rail.
You could start with a small computer but I opt for a "Programmable Logic Controller" (PLC) as reccommended above. Figure $300 to $600 for the controller and it may have all the outputs you need
So many to choose from. Ohmron,Schneider Electric (Modicon), Allen-Bradley, Eator, Siemens, Idec. Omega has a nice one http://www.omega.com/ppt/pptsc.asp?ref=OCSXL_SERIES.
While the commercial logic controllers are nice units for the price, few of them have sufficient output current ratings to drive the sluice gate motors, and most of them do not have enough inputs for all the sensors and limit switches. The outputs would have to drive additional contactors or SS relays, meaning additional cost and all the headaches of contact arcing if mechanical contactors are used. These are the reasons I recommended a "homemade" controller that would require more effort but would have a much lower cost.
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Kevin, I have found the a cheap controller supplied from B& B electronis works well and is simple to program.
Teco Controller SG2 V3 $150.00 Easy to program. Select a controller maybe pn SG2-20ht-D Transistor outputs that can drive relays.
You can select a programming method of block diagram to program.
Free SW, cable $20 to connect to laptop, get USB to serial adapter Ebay. Add a 24 volt power supply from Jameco.com 24v 3amp $20-30 to run controller and relays.
Add external relays to control motors, a nema 67 waterproof enclosure. "Meet Local electrical safety requirements", and away to go!