2 output Grey code simultaneous output problem
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2 output Grey code simultaneous output problem
I have an issue with the atc 2 out grey code in that it is not turning off the fwd out before rev out.... I have a 4 pos lathe turret that has a 220v 3 wire motor fwd-com- rev using two relay to actuate. the outputs should never be on at same time. any help would make my day. this is the last hurdle on a Optimum L28 Lathe conversion replacing a siemens 802s. so far all setup has been a breeze compared to mach4... any help would seal the deal on centroid for all future retros i do. Thanks
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Re: 2 output Grey code simultaneous output problem
I agree that the PLC logic should not have both forward and reverse on simultaneously.
However, it is more important to use a reversing contactor setup that prevents faults even if the PLC logic does fail: either use a reversing contactor set with a mechanical interlock that prevents both sides from pulling in simultaneously; or wire the coil of each relay/contactor through normally-closed contacts of the other relay/contactor, so each cannot get coil power if the other is active; or -- ideally -- both of those things.
However, it is more important to use a reversing contactor setup that prevents faults even if the PLC logic does fail: either use a reversing contactor set with a mechanical interlock that prevents both sides from pulling in simultaneously; or wire the coil of each relay/contactor through normally-closed contacts of the other relay/contactor, so each cannot get coil power if the other is active; or -- ideally -- both of those things.
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Re: 2 output Grey code simultaneous output problem
i am not following reply, currently even if contactors were wired exclusive plc logic starts with out 5 then turns on out 6 while out 5 is still active how would contactors differentiate. any way I have a hardware setup that is working.... the turret spins forward but doesnt stop and reverse when out 2 is fired... bcd tool positions are being reported correctly... tool dro follows my manual actuating of contactors... I have two panel switches to fire fwd,rev. contactors....so the real need is sequential independent signals hoping best fix is in plc software as opposed to buying new relay sets.
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Re: 2 output Grey code simultaneous output problem
i just read my own reply i guess i could kill (out1) with (out 2) nc-contact circuit ....thanks for your help i believe that will work with the siemens contactors installed. Im going to try. will report not sure if this is a work around but I see it will work. thanks again and may the LORD bless the work of your hands!
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Re: 2 output Grey code simultaneous output problem
Thanks again for your help cncsnw i have 24v dpdt relays actuating contactors so i just wired 24p through rev relay N.C. circuit and BAM!!!! worked like a charm!!!!
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- Posts: 30
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Re: 2 output Grey code simultaneous output problem
Occums razor i forgot how much logic can be orchestrated by relays.