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CONTENTS
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You and CMMS, Part 1
Electrical Troubleshooting
Quiz
Troubleshooting PLC Analog
Output 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
National Electrical Code®, which is a registered
trademark of the National Fire Protection Association.
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Maintenance
You and CMMS, Part
1
At a minimum, your computerized maintenance management
system (CMMS) should do the following:
- Record and track material usage and labor costs.
- Capture information on inventories.
- Control the work-order system.
- Provide equipment data and history.
- Schedule and track preventive/predictive maintenance.
- Link all critical information in a relational database.
- Provide some analysis functions.
- Export data to spreadsheet and database applications for
analysis.
Very likely, it does all of these things and more. But are you making
use of these features? More importantly, what are you doing with the
information once you have it? We'll explore these areas more in depth
in
future issues.
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Repair
Electrical
Troubleshooting Quiz
A PLC controls the rate of water flow to a continuous
mixer. The operators are reporting that batches have recently started
coming out far too thin (too much water). Preliminary troubleshooting
has established the input side of the water control loop is
problem-free. That is, simulated inputs to the PLC always produce the
correct response in the PLC. The water valve has been stroked, and it
works perfectly.
Where do you need to look for the problem?
Visit EC&M's
website to see the answer.
Troubleshooting
PLC
Analog Output Modules, Part 2
Does the module's output correspond correctly to its
input? Determine that by forcing the PLC output to 10%, 25%, 50%, 75%,
and 90% and measuring on the output terminals at the corresponding
range. For example, if it's a 4mA to 20mA module, then at 10% input
from the PLC you should measure 5.6mA (10% of 16mA + 4mA).
If you don't get the anticipated results, disconnect the field
wiring
and use a test load (typically 250Ω to 1,000Ω; your loop simulator
instrument should provide this). If the results are correct, the
problem
is in the field wiring. If you get incorrect results, then replace the
module. However, don't replace the module until you've verified the
field wiring and devices in the output loop are OK, or you may be
replacing that module again.
To read more on this story, visit EC&M's website.
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Operation
NEC in the
Facility
In our previous two issues, we discussed how studying
Example 3(a) in Annex D is beneficial. Example D10 is another NEC
resource worth spending time on. Unlike D3(a), it includes a figure
that illustrates the application.
The problem is one of determining feeder capacity for six identical
elevators. This isn't a typical application in MRO for facilities, but
the example provides useful insights to apply to other applications.
The example uses five steps to arrive at the total feeder
ampacity.
To read more on this story, visit EC&M's website.
Safety
A few basic rules for hand tools:
- Good workmanship requires good tools, and so does safety. Clean and
inspect your tools after each use so they are ready for the next use.
- Count all tools used for any given space before entering and after
exiting. This is how you prevent the "someone left a wrench across two
phases, but we didn't know that when we energized" problem.
- Carry tools in a tool pouch, not in your pocket.
- Screwdrivers are for driving screws; pry bars are for prying things
apart.
- Using socket extensions for any kind of impact work can cause them
to shatter; respect them accordingly.
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