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Old February 9th, 2018, 01:26 PM   #5
United States

Timeismoney08 is offline
Join Date: Jul 2012
Location: United States
Posts: 251
Originally Posted by g.mccormick View Post
Put two contactors in series.

Put L1,L2,L3 through one contactor and then through another contactor in series. Then to pull in that contactor, have the output side of each chain on the safety relay pull in each contactor individually and monitor the AUX on the PLC?

Would the PLC need to be safety rated at that point to monitor for a stuck contactor? and would that make it control reliable as long as there is no one point of failure that could trick the system into always running?

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