PhilipD
Member
Hi all,
First a little background information. I have worked as a maintenance mechanic for the last 15 years. In that time I have only worked in factories that make corrugated (cardboard) boxes. My education in this has been on the job training, a few classes in electrical, pneumatic, hydraulic and so on. I don't consider myself to be an electrician but I do feel pretty good about my skills in that area. I started with a new company last June and the electrical standards there are pretty low. I opened the box to one machine and my jaw just about hit the floor. It was a rat's nest of wires (none of them numbered), most yellow and many cut and spliced back together with another wire or two and held with wire nuts. The main disconnect rod has shorted against the terminal screw on several occasions. The third leg wire going from the disconnect to the fuses is burnt and the fuse is dark from heat. A red wire was used as a neutral wire on a relay and the neutral from an air valve solenoid is wired to one of the contacts on that same relay.
It's a nightmare! I am building a new panel (with many used parts) to replace this thing. My boss, who has only been there a few months more than me, wants to put a PLC in to control everything. I saw this as an opportunity for me so I have spent the last few months learning what I can about PLCs and programming. To this end I decided to use a MicroLogix 1000 1761-L32AWA. I have written a program for this PLC but I am asking you to review my program and offer any comments and suggestions.
Thank you,
First a little background information. I have worked as a maintenance mechanic for the last 15 years. In that time I have only worked in factories that make corrugated (cardboard) boxes. My education in this has been on the job training, a few classes in electrical, pneumatic, hydraulic and so on. I don't consider myself to be an electrician but I do feel pretty good about my skills in that area. I started with a new company last June and the electrical standards there are pretty low. I opened the box to one machine and my jaw just about hit the floor. It was a rat's nest of wires (none of them numbered), most yellow and many cut and spliced back together with another wire or two and held with wire nuts. The main disconnect rod has shorted against the terminal screw on several occasions. The third leg wire going from the disconnect to the fuses is burnt and the fuse is dark from heat. A red wire was used as a neutral wire on a relay and the neutral from an air valve solenoid is wired to one of the contacts on that same relay.
It's a nightmare! I am building a new panel (with many used parts) to replace this thing. My boss, who has only been there a few months more than me, wants to put a PLC in to control everything. I saw this as an opportunity for me so I have spent the last few months learning what I can about PLCs and programming. To this end I decided to use a MicroLogix 1000 1761-L32AWA. I have written a program for this PLC but I am asking you to review my program and offer any comments and suggestions.
Thank you,