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14 Cards in this Set
- Front
- Back
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list the possible functions of a controller |
start/stop/run/reverse/speed control/safety of operation, protection of equipment |
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control circuit consists of |
coil, contacts, holding contacts, |
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what is a digital device? |
two state device, open or closed, circuit breaker, on off switch |
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analog device |
multiple settings, transducers, speed, tempregulated |
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power circuit consists off |
main contactors, overload heaters to the motor |
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two-wire pilot devices |
float switch, pressure switch, thermostat, limit switch |
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colours |
blue, breaker closed amber breaker open green - motor running red - trip or power fail white -power on |
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motor protection devices |
fuses/overload relays/circuit breakers |
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what muse a fuse be able to detect |
short circuit, open before damage/not affect normal operation |
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types of fuses |
standard/time delay (slow blow) |
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what is a circuit breaker |
device that will open a circuit automatically at a predetermined over current |
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electronic timer uses |
solid state |
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purpose of interlock |
prevent opposing contactors from energizing simultaneously |
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three wire control porvides low voltage protection because of what component |
parallel with start button, holding circuit interlock |
