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CONTENTS
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Cast Your Vote for the
EC&M Product of the Year!
You and IR, Part 3
Electrical Troubleshooting
Quiz
Troubleshooting PLC Digital
Input Modules, Part 2
NEC in the Facility
Safety
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About This Newsletter
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This twice-a-month
e-newsletter is brought to you from the
publisher of EC&M magazine. MRO Insider addresses topics such
as:
Working with management and supervision
National Electrical Code® on the production floor
Safety procedures and programs
Troubleshooting techniques
Equipment maintenance and testing tips
Managing motors and generators
Trends in training and education
Managing energy use
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The designations "National Electrical Code" and "NEC" refer to the
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Product of the Year Competition
Cast Your
Vote for the EC&M Product of the Year!
Would you like to help pick the prestigious EC&M
Product of the Year winner and qualify for a chance to win $100? If
you're an EC&M subscriber, make your vote count by visiting the
2010
EC&M Product of the Year category winners list. To review
the
products, click on the links for each of the 33 category winners to
read
a brief description and view a photo. Once you're finished with your
review, visit the
polling page, enter your contact information, choose your favorite
product from the drop-down menu, and click submit.Your selection
will
help us identify the 2010 EC&M Product of the Year Platinum,
Gold, and Silver award winners. As an added incentive, three lucky
voters will be randomly selected to receive a $100 gift check. The
voting poll will remain open through 5 p.m. on June 18, 2010. Please,
only one vote per EC&M subscriber. Any votes received from
manufacturers, PR firms, or non-EC&M readers will be
discarded.
Maintenance
You and IR, Part 3
When you do thermographic surveys, do you look for
problems, or do you expect things to be OK? You can fix problems, but
you can't fix what’s OK. Experts advise performing surveys under
normal running conditions, because equipment that isn't running won't
generate a very useful thermal signature (although some defects will
still show up).
Problem: If you don't find defects under normal operating
conditions, this doesn't mean they don't exist. Normal running
conditions aren't the conditions under which the next failure is likely
to happen.
Solution: Follow up with a stress mode survey. To the extent
possible, run key equipment under maximum load, and repeat the
thermographic survey. Look at the delta between the two surveys.
Caution: Plan this out with operations first.
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Repair
Electrical
Troubleshooting Quiz
You reported in on the nightshift to discover that a
solvent day tank sometimes overflows and sometimes runs dry. The
consequences alternate between solvent spills and ruined product
batches. You found extensive notes from the dayshift, showing
methodical
testing in the entire process loop, including point to point continuity
tests. The I/O modules work properly, and simulated signals to the
control valve provide the correct response.
With this information on hand, what should you do next?
Visit EC&M's
website to see the answer.
Troubleshooting
PLC Digital Input Modules, Part 2
In our previous issue, we noted that the first step in
troubleshooting digital input modules is to verify the power source of
each loop. If input power is missing, the causes can be such things as
blown fuses, broken wiring, or broken connections.
Once you've fixed any power problems, you're ready to simulate input
changes. Connect a DMM across the input (at the module). Then, actuate
the field device and watch for the voltage to change. If it doesn't,
you
have a problem in the loop between the input module and the field
device. It's probably a wiring issue. If the voltage changes, you've
just verified the integrity of the loop between the input module and
the
field device. So where is the problem?
To read more on this story, visit EC&M's website.
Operation
NEC in the
Facility
Although Annex B is not part of the NEC requirements,
it
does provide information that can help you with NEC compliance. The
Chapter 3 ampacity tables don't address every type of installation. If
yours isn't covered by a table, how can you get the correct minimum
ampacity?
If the problem is simply that you have more than three conductors,
the answer is to use those Chapter 3 tables and just derate the
ampacities per Table 310.15(B)(2)(a). For other applications not
covered
by these tables, you'll need to determine ampacity under "engineering
supervision." The NEC helps clarify what that entails in Annex B.
The bulk of Annex B consists of tables that provide "typical
ampacities for conductors rated 0V through 2000V"…duct bank tables,
and…"conductors rated up to 0V to 5,000V."
To read more on this story, visit EC&M's website.
Safety
Stairways and ramps aren't moved around the way ladders
are, but they still aren't inherently safe. OSHA requires inspection
and
maintenance. Check for:
- Illumination. A change in grade or elevation requires some
depth perception to safely navigate. Poor lighting interferes with
this,
making falls likely.
- Structural and mechanical integrity. Ramps may fail at
mechanical/structural stress points during high load conditions. A
qualified person needs to inspect these points at established
intervals.
- Cleanliness. Ensure everyone understands that grease, oil,
or
trash on a ramp or stairway must be removed immediately or the route
must be closed off until it can be.
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