2 output Grey code simultaneous output problem

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cmkanefab
Posts: 30
Joined: Mon Oct 31, 2022 5:51 pm
Acorn CNC Controller: Yes
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CNC Control System Serial Number: 20d77882d94b-0817226462
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2 output Grey code simultaneous output problem

Post by cmkanefab »

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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cncsnw
Posts: 3764
Joined: Wed Mar 24, 2010 5:48 pm

Re: 2 output Grey code simultaneous output problem

Post by cncsnw »

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.
cmkanefab
Posts: 30
Joined: Mon Oct 31, 2022 5:51 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 20d77882d94b-0817226462
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: 2 output Grey code simultaneous output problem

Post by cmkanefab »

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.
cmkanefab
Posts: 30
Joined: Mon Oct 31, 2022 5:51 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 20d77882d94b-0817226462
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: 2 output Grey code simultaneous output problem

Post by cmkanefab »

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!
cmkanefab
Posts: 30
Joined: Mon Oct 31, 2022 5:51 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 20d77882d94b-0817226462
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: 2 output Grey code simultaneous output problem

Post by cmkanefab »

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!!!!
cmkanefab
Posts: 30
Joined: Mon Oct 31, 2022 5:51 pm
Acorn CNC Controller: Yes
Allin1DC CNC Controller: No
Oak CNC controller: No
CNC Control System Serial Number: 20d77882d94b-0817226462
DC3IOB: No
CNC12: Yes
CNC11: No
CPU10 or CPU7: No

Re: 2 output Grey code simultaneous output problem

Post by cmkanefab »

Occums razor i forgot how much logic can be orchestrated by relays.
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