Transcript EET 270 Safety Procedures

Welcome to EET 272 and 273
Motor Controls II
Roll Call!
Scope of Class
• Continue with Motor Controls and work on
real Cabinets
Course web-locker
• I will be using a course web-locker to post
Discussion notes, Homeworks, Lab notes,
Quiz/Exam Study Guides…
• I will send you a link to the notes for today
Review Syllabi
• Lecture
• Lab
LogixPro
• I require the Program LogixPro for this class.
Logixpro can be purchased as a single
Download or with a CD Key. I recommend the
CD Keyed version if you have a computer with
a CD.
• LogixPro is a PLC Simulator with a number of
simulations to work with.
EET 273 (Lab) Safety
First Goal
• What is the first goal of this Lab?
Answer:
• To get you out of here without
injury!
Second Goal:
• Learn Motor Controls
Lab PPE
• You must wear safety glasses at
all times while working on or
around the trainers
Trainers- Dangers
• Electrical Hazard
• Lifting Hazard
• Drop Hazard
• Rolling Hazard
• Escape Hazard (snap, crackle, run)
Electrical Hazard
• High Voltage: 120/208 VRMS
• Arc Flash
• Electrocution
Electrical Hazard prevention
• Trainers MUST BE UNPLUGGED while
building the circuit
• All troubleshooting will be done
while trainer is unplugged (Cold)
Working Live
• You will not work on the cabinets live, I will.
If a Fuse is blow
• Do not reset a circuit breaker or
replace a fuse unless you think
you understand why it blew in
the first place!
Measuring Voltage
• Use one-Hand Method
• Voltage is measured across a
Component
Wire Numbers
• These will help you keep you keep things
straight while working between cabinets
• Find a set of 20 non-repeating numbers and
keep them in your cabinet
• Assign the wire numbers before you begin
• Re-label the wires that run between the
cabinets one at a time.
Wire Stripping/Numbering
Strip the wire so just a bit of
the Copper shows above
and below the terminal
plate.
Tape the Wire Number
about ¼” from the terminal
plate so that the number
faces out
Wire Numbers
• Assign the wire numbers before you start to
build so that you can tell what goes where
• Re-number the wires in the terminal strip to
the switch box one at a time so you do not
have to try to figure out which wire goes
where.
Crimp-On Terminals
• Be careful to Crimp in
the Metal under the
insulator
– Crimping in
opposite where the
metal joins
• Leave a bit of Copper
“peak through” near
the terminal
• Pull in the terminal to
test the crimp
When to use Crimp-on terminals
• Use Crimp-ons if you have to place a wire
under a screw head, if the part does not have
a wire-plate.
Wiring
• Recycle Wire before you grab a new Roll
• Run the wire in the Cable-tray and leave some
slack.
• On The Switch Cabinet, Run the wires from
the terminals to the switches so that they can
all be tied together for a harness.
• In the Control Cabinet, allow some slack on
wires, but not too much.
Adequate Switch Wiring (14/20)
Professional Wiring (20/20)
Professional Wiring (20/20)
Do I expect or want perfection on Day 1?
NO, but the wire should be such that if this
were Lab 11 you could finish it out properly.
How to get Professional Results
• Make the First Wire a Guide-Wire. (Grey Wire)
– Then use the guide-wire to route all other
connections
Wiring
• Use only one wire number for each wire
connection!
– Do not use 7 to 121 to 121 and back to 7!
– Tape over the wires on the terminal strips if
necessary.
Switches
• Check to make sure the contacts open and
close as they should before you build the
circuit.
• Check to make sure the switches are all
correct and oriented properly. See the Switch
Layout.
Critique Last Semester’s Trainers
Do not invite in Gremlins
• If you leave your trainer plugged in, or your
trainer or area messy this will attract the
Gremlins.
• Gremlins like to move wires and do other
nasty things.
• It is best to simply not create an environment
they like to be in.
The Reality of Lab Partners
• Make accommodations for the weak, but do
not be held back. The work must go on,
• Make sure your Lab Partner’s drawing
matches yours.
– Assign the wire numbers BEFORE you start the
build.
– Put the dates you worked on the lab on the back
of the drawing.
– If your partner misses go on without them and
bring them up to date when they return.
Lab Partners
• If they miss on the commissioning they will
only get credit for the days they were there.
• Learning to work with others is a fact of life.
Deal with it.
– SOPs (Standard Operating Procedures) help out a
lot.
Lab Grades
• Grades are in 2 parts: Wiring and
Documention
Lab Documention
• You will provide me with a Motor-over Line
Diagram of the the circuit that should match
reality.
– I will spot-Check wiring
• The drawing must be complete and legable.
• The work done on each day should be on the
back of the drawing .
– 1/13/15: Completed Design
– 1/15/15: Wired Switches & MS
Coop/Jobs
• If you are not working and would like to, get
linked into Kevin Dunn’s Job-alerts
• See my Weblocker.
Look at Lab 1
• Lab 1 Handout
• Lab 1 Notes