Forum Title: Filtering signaling and control circuits power
I have a engineering question. When dealing with singling equipment for relays, timers, and contactors when should filtering be considered? If there is electronics involved,definitely. When multiple relay coils firing on and off, when does it start to be praticial to start adding filters?
Category: General Electrical Discussion
Post By: Debra T (Mecan, WI), 03/23/2017
I'd start thinking about using a PLC or two if the complications build up.
IBM used tons of relays back in the olden days and we never thought of filtering. Even the original TTL and DTL logic using discrete transistors on cards was pretty noise tolerant. It was when we got to miniaturized electronics on chips with fairly low currents and low voltages that the problem arose.
The most important thing is to always ensure there is a suppression diode accross relay coils.
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