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June 22, 2010 A Penton Media Publication Vol. VI No. 12



CONTENTS
You and IR, Part 4

Electrical Troubleshooting Quiz

Troubleshooting PLC Analog Input Modules

NEC in the Facility

Safety



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MRO Insider addresses topics such as:

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    Maintenance
    You and IR, Part 4
    The timing of a thermographic survey can determine how much of that effort is wasted. Thus, avoid performing one shortly before a planned shutdown. You want to use that shutdown to fix problems you found during the survey, and some repairs may involve significant lead times. Consider some of the resources:
    • Outside contractors. You may need a specialized firm to address those hotspots all over the MCC.
    • Spare parts. That replacement 2,000A breaker probably isn't going to be lying around on a shelf. It may even have to be built.
    • Special equipment. Renting a special test set on short notice may be doable for an extra fee, but renting a crane on short notice is normally not possible.


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    Repair
    Electrical Troubleshooting Quiz
    The shift supervisor complains that batches are running on the dry side, despite the fact that no recipe changes have been made. The only liquid in the batch comes from a vat that is supposed to reach 75% full then dump into the mixer. To get a handle on this problem, what are some steps you should perform?

    Visit EC&M's website to see the answer.


    Troubleshooting PLC Analog Input Modules
    In the previous two issues of this newsletter, we looked at troubleshooting digital input modules. Basically, we looked for the presence or absence of a voltage. With analog modules, it's trickier because the level of that voltage now matters — unless it's a current loop, in which case the level of the current matters.

    As with digital modules, there isn't a standard value. With current modules, it's typically 4mA to 20mA, and with voltage modules it's typically either 1V to 5V or 0V to 10V. However, the same system could use many other values.

    To read more on this story, visit EC&M's website.


    Operation
    NEC in the Facility
    The Annexes of the NEC are often overlooked, yet can make a huge difference in the cost and delivery of projects that involve expansion, renovation, or upgrades. Reviewing your bill of materials against Annex A can prevent the cost of ripping out installed equipment and materials, then replacing with other equipment and materials your insurer will accept.

    For example, suppose your company has decided to bring database work in-house for security reasons. So, you're going to have a UPS and some high-end work stations. The electrical equipment isn't an issue, because the distributor you deal with carries only listed components. But what about those office furnishings?

    You can look that up in Annex A and then specify they must conform to UL1286. That UPS, by the way, should conform to UL 1778. The surge protectors you're going to install should conform to IEEE C62. If you were doing a project that involved combustibles, you'd look in Annex A for the relevant ISA standards.

    To read more on this story, visit EC&M's website.


    Safety
    Some safety tips for erecting scaffolding include:

    • Eliminate guesswork. Ensure that a qualified person supervises putting it up and taking it down.
    • Use sufficient structure for the load. Scaffolding must be able to support its own weight and at least four times the maximum intended load.
    • Ensure adequate footing. Erect scaffolds on rigid, solid footings. Don't use unstable objects to support scaffold frames or planks.
    • Protect sides and ends. On any scaffold platform taller than 10 ft, install guardrails and toe boards on open sides and ends.
    • Use other accessories, as necessary. Examples include base plates and mud sills.

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