SLC 500 analog controls
SLC 500 analog controls
(OP)
Hey I was wondering if you guys had any genius ideas on controlling a modulating gas valve using an analog input on an SLC 500 PLC
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RE: SLC 500 analog controls
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If we learn from our mistakes I'm getting a great education!
RE: SLC 500 analog controls
RE: SLC 500 analog controls
You didn't say, "to control an explosive gas being pumped into an enclosed space where it is mixed with a sociometric air mixture and ignited"..
You better not be learning how to do what you want to in this application.
Keith Cress
kcress - http://www.flaminsystems.com
RE: SLC 500 analog controls
xnuke
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RE: SLC 500 analog controls
RE: SLC 500 analog controls
There are plenty of dedicated temperature controllers that will do the job at a fraction of cost and complexity.
Roy
RE: SLC 500 analog controls
RE: SLC 500 analog controls
RE: SLC 500 analog controls
How can you directly modulate the gas valve if there is a "burner system" involved? Burner systems are generally part of the burner control.
Keith Cress
kcress - http://www.flaminsystems.com
RE: SLC 500 analog controls
We have a small steam-raising boiler on plant which is primarily designed to establish low grade steam for fuel pre-heating. Its automation is a loosely integrated hybrid of a PLC for sequencing, three Moore loop controllers, a couple of flame scanners and a trio of hardwired sequence supervisory units. It is a nightmare to fault-find and is difficult to assess for functional safety. It is screaming out for a modern burner management system, possibly based around one of the new safety-qualified PLCs, and I suspect that your application has some parallels with this.
We should have taken the opportunity when the old TI-505 packed in, but for various reasons it was replaced with an SLC500 performing the same role. At the time I wanted to ditch the Moore controllers and at least have the PLC doing the majority of the control, but that was in the days when a safety-qualified controller meant Triconex, which is an abbreviation for "holy sh*t, that is expensive!". Now there are some alternatives.
Save yourself the pain and contract this out to an automation company with BMS experience who can add the other functions to their package.
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If we learn from our mistakes I'm getting a great education!