The circuit is on a process line in a steel mill and uses a Processor to pull the material off the Pay Off Reel. When the PLC detects several laps left on the Reel the line slows down from about 800fpm to 15opfm and stops at tail out. We recently had a fast tail and others want a back up circuit in place. The following is how the current circuit works. The Pay Off Reel has an encoder that feeds into a High Speed Counter GE Genius Block and the Processor, is used to pull the material off the Pay Off Reel, has an encoder that feeds into the same High Speed Counter GE Genius Block. These signals are passed to the PLC where calculations are made using these two inputs. The PLC calculates coil circumference, strip gage, and feet on the Reel using the footage from the Processor Encoder and the revolutions of the Payoff Reel Encoder. The calculations are compared to set values and a Auto Slowdown bit is sent out and controls a relay.
Any thoughts on a backup circuit that could be used in this application, easier the better for maintenance purposes?
Any thoughts on a backup circuit that could be used in this application, easier the better for maintenance purposes?
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