R
Richard3009
If you wanted to use an output of a PLC to start a DOL motor, would the PLC output power be used to energise the coil on the contactor at 110v,
Discuss PLC switching in the Commercial Electrical Advice area at ElectriciansForums.net
Richard3009;9 If you wanted to use an output of a PLC to start a DOL motor said:You can use a PLC to switch the DOL but depends on a couple of things. Firstly does your PLC output 110v and secondly could it handle the current switching.
Is your PLC a micro logic block, brick or modular?
Is the output a relay, transisor or triac?
You could also use an interposing relay which is the PLC output switching a relay to switch in the DOL contactor.
A word of warning; follow all PLC manufacturer's instructions for switching inductive loads else you could end up replacing components or the PLC itself... back up the PLC program too!
regards s.f
If you wanted to use an output of a PLC to start a DOL motor, would the PLC output power be used to energise the coil on the contactor at 110v,
... I doubt the card will be 110v....
joel,
Your post is somewhat confusing.
I have to assume you mean through, rather than threw?
Why should there be sparking at a PLC IO card when switching a contactor coil?
A large transformer will have more inrush current and back EMF than a contactor coil.
The back EMF from a contactor is easily suppressible if you are using good equipment the contactor manufacturer will have a stock snubber of flywheel diode etc. that you can just fit to eliminate the back EMF through the PLC.
Reply to PLC switching in the Commercial Electrical Advice area at ElectriciansForums.net
We get it, advertisements are annoying!
Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.