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32 Cards in this Set
- Front
- Back
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potiental difference is
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voltage EMF and electrical pressure
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if a signal wire is broken it drops to
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0 current
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if a signal wire shorts it
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spikes current
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signal cable has a shield like aluminum foil or loose wire how man sides are grounded
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1 side
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120vac black wire
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hot
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120vac white wire
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neutral
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120vac bare wire
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ground
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common means
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they whats they
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foot switch
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a switch you hit with you foot 2 basic types one with toe guard and one with a box
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pendellum switch
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has to be tarzan proof found on overhead cranes
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photo cell
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3 types through beam , retro reflective, reflective. have to have an admitter and reciever
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while checking a motor phase to ground 0 resistance means
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bad motor
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while checking a motor phase to ground high resistance means
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good motor
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the preferred meter to check a motor is a
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mega meter
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you can use what meter's to check a motor
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mega meter , ohmmeter , voltmeter
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you can check a fuse with what meter's
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ohmmeter and a volt meter
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on a fuse if you read 0 resistance the fuse is good or bad
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good
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on a fuse if you read high resistance the fuse is good or bad
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bad
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voltage to check a fuse 120vac reading from one side of the fuse to the other reading 120v is good or bad
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bad
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voltage to check a fuse 120vac reading from one side of the fuse to the other reading 0 the fuse is good or bad
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good
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ohmmeter is not used with what
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live voltage
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most common failure of well designed circuits are
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loose connections
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long cable check the installation uses a
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megometer
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poor trouble shooting affects the
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company
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not a good thinking skill for trouble shooting
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out of the box
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trouble shooting begins when
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when you start working
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when a circuit spikes high that means you have a what
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short circuit
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analog are easy to trouble shoot with simple volt meter
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true
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5v dc power supply is
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5v
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if you loss power check the
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e stop
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whenever trouble shooting you should look for the
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obvious
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to check a shorted motor use a
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ohmeter
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