The Turkey Slayer

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  1. UL Inspection

    I'd get ahold of the UL508A spec and study it. There are a ton of things that affect your design and documentation. You'll need to calculate the SCCR of your panels and label them properly with that and all the other information required. It's definitely possible to have a labeled panel that is not UL compliant, if you get an incompetent inspector. We just got a panel in from England that was stickered. It gave itself a 300 kA SCCR rating even though not a single component was rated above 200. My favorite part though was the use of supplementary circuit breakers as branch circuit protection. They even changed wire sizes through these breakers. But the UL Listed sticker was there nonetheless. Whoever put it there has no business around a control panel and ought to lose their job.
  2. LBL JMP

    JMP and LBL aren't used very often anymore. They're a holdover from the days when memory was expensive and processors weren't as powerful. They're included for legacy purposes, but the instances in which you'd actually NEED them are rare.
  3. 2 vfd, 1 pot

    Yes, you can do this. I know the Allen-Bradley drive manuals have a schematic for this if that's the brand you're using, but I'm sure the principle is the same on others, too.
  4. Cooling Options

    There are massive differences between a window unit at Lowe's and a control panel A/C from Hoffman. For one, the Window Unit is a residential grade unit. The manufacturer didn't have to spend the extra time and money building an A/C unit that complies with all of the various certification requirements for industrial-grade devices. It's more than just cutting and bending some steel a different way. It's more R&D and engineering time. Plus, Hoffman isn't selling nearly as many units as Lowe's is, so they don't have the economy-of-scale advantages residential unit makers have. It's a basic fact in manufacturing that the more you make of something, the cheaper each unit becomes. Those hard setup and tooling costs are spread over more units. Plus, there is more of an incentive to increase the efficiency of the process as time goes on.
  5. Heat Load Calculations what do you use?

    Hoffman has a thermal calculator on its Thermal Management website. I've found most manufacturers list the heat output of their devices in Watts, not BTU/Hr. You'll usually find this in their spec sheets as "Watts Loss." But whether or not you'll need air conditioning is determined by these factors: 1. The surface area and volume of the enclosure. 2. How much of that surface area is exposed to the air (so for a wall-mounted panel, you'd need to subtract the area of the back face from the total surface area) 3. The insulation value of the panel. 4. The max. temperature outside the panel 5. The max. allowable temperature inside the panel Also, it matters where the panel is located, if it's in direct sunlight, and even what color it is. Obviously if it's outside a darker-colored panel is going to absorb more heat.
  6. Panel Thermal Management

    One thing to keep in mind. No heat exchanger, water-cooled or otherwise, is going to perform as well as an air conditioner. The reason is because an A/C system manipulates boiling points. It takes 1 btu to heat one pound of water 1 degree. So if you had a pound of water (about a pint), it would take 1 btu to heat it from 211 to 212 degrees. But to actually boil that water and turn it into steam would take 970 btu. When the refrigerant in the evaporator of an A/C boils, it is removing hundreds of times the heat from the panel a simple heat exchanger would.
  7. Safety: EN 954-1 Category 4 and PLC Wiring

    Euchner makes a system that allows you to daisy-chain devices and still get cat 4.
  8. analog filtering

    Keep in mind if you're using a 1762-IF4 the total update time isn't necessarily what you select on an individual channel. It is the AVERAGE of ALL FOUR channel filter settings, even the ones you aren't using. So if you want a 450ms update time, you need to set all four channels to 450ms in order to achieve it.
  9. analog filtering

    The 1100 isn't much older than the 1400 and also has an on-board Ethernet port. Perhaps you're thinking of the 1000?
  10. how to convert .rss to pdf?

    I think Adobe gives away it's PDF Printer driver along with the latest version of Reader. If not, they're easy enough to find. I would just print a project report in RSLogix but point it to the PDF Printer driver instead of a physical printer.
  11. FactoryTalk Studio

    FactoryTalk View is up to version 7.0. You probably would have wasted a lot less time just buying the upgrade. I know it's expensive, but I'm guessing you don't work for free, either.
  12. SLC Ethernet Options

    The Best, but most expensive option is to buy a Control Logix rack, power supply, a 1756-DHRIO and a 1756-ENBT. You can then browse the DH+ network in RSLinx over Ethernet, message between processors, and yes, communicate with FTView SE. You could also have a dedicated PC with a PKTX(D) card and RSLinx Gateway, but the problem with that is you're relying on Microsoft Windows running to keep the link up.
  13. Rs Logix 5000 V21 on XP

    Studio 5000 is ONLY applicable to versions 21 and above. Versions 20 and below are RSLogix 5000. You basically have to install both if you want compatibility on either side of the dividing line. Keep in mind, Studio 5000 editor and RSLogix 5000 are essentially the same program, it's just that version 21 brings a new name with it. Honestly, I'm surprised they didn't call it something like FactoryTalk Design Studio View Editor Station Logix 5000 SE ME XP 33 59 LE, but then again that would be expecting Rockwell to be consistent at something.
  14. Sequencer - Control File Operand sizes do not match

    Never mind, I found the issue. My mask values weren't right. One of the masks I wanted was 0000 0000 1000 1111, so I typed that into the mask field and got that weird alphanumeric interpretation. When I changed the mask to 008Fh, it validated.
  15. I"m converting a SLC 150 program to Micrologix 1400, and there are a number of SQO instructions in the program. I feel like I have a pretty good handle on how sequencers work, but I'm running into a problem when I try to validate my logic. I'm using addresses I've set up in R6 to be the control files for each SQO instruction. Specifically I'm using R6:0-5 for my six sequences. All of them have a varying number of steps. The problem I'm having is when I go to validate I get the "ERROR: Operand sizes do not match" message on every rung where I Have an SQO. I'm not sure where I went wrong. I looked at a video online and it seemed pretty self explanatory. He used R6:0 as the control file for his one sequencer and had no problems running the logic, so I'm not sure why I'm getting an error message. I've attached the program file. Keep in mind it's a work in progress.