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ELECTRIC MOTOR CONTROLS + E8 | y0 S2 f E5 x
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Once the proper motor is selected, understanding the many various control devices available and
5 ^( M- t5 X9 r- {& u: wtheir uses and limitations becomes an important part related to reliable operation and protection of : I' ^1 W) C! S# s1 K, V
the motor and the personnel using the motor. / A1 k& L' ]0 o4 c Q
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several + b. L3 m/ p% U* p) M- }
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
" O4 K0 d J! j4 xcontrol equipment can accomplish multiple functions from each of the topics or categories. & o! h4 ]& _7 T3 o$ |) \7 J
. I! ]" l- C0 O9 zThe four categories include:
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1) Starting the Motor
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Disconnecting Means
3 t! {8 g% t4 o |& F' BAcross the Line Starting 9 v4 v2 o8 N' C# n7 X* @$ h
Reduced Voltage Starting
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2) Motor Protection ( I H6 o% ?/ m" l p, Q" Q1 v4 T
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Overcurrent Protection # @* } B7 b: I! p; X, `1 t
Overload Protection
0 z4 ^) L, k5 W+ z. T1 p) f0 r: pOther Protection (voltage, phase, etc)
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! `, G( n6 X% z* ?1 ]. m3) Stopping the Motor 1 h3 \0 y1 }( {2 R
7 |! X+ H- Z* @+ }Coasting
, T; p E' E, |: r2 o- { z, xElectrical Braking ' ]* W* B. Q b G1 v. N0 \
Mechanical Braking ! [ t( `( h) v) G* B3 f
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/ D! |6 F3 E( j) r$ ]- {) q4) Motor Operational Control
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Speed Control 3 @, Z& W4 x2 b6 Q
Reversing Y1 S+ a3 l- `
Jogging
4 ^1 t, ^! J9 P# oSequence Control |
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