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ELECTRIC MOTOR CONTROLS ( T3 Q, S5 m1 N; E$ Y
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Once the proper motor is selected, understanding the many various control devices available and 9 T% M2 A, C2 x9 o- u
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics ; G( R+ f+ E2 L" v9 H
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There are four major motor control topics or categories to consider. Each of these has several : c/ c: S: e- X$ [: E1 k* F
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
+ U# C* A$ n5 g2 Z. j: hcontrol equipment can accomplish multiple functions from each of the topics or categories. ; E+ C j& j" |$ F1 E$ A" N
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The four categories include:
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& C2 _0 r+ P, Q- h1) Starting the Motor
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" ^7 _4 p7 d, m% c# z( c6 HDisconnecting Means 8 _! r# Y6 v, \* N" e1 ~
Across the Line Starting
3 r$ z" Z/ v0 V# o* gReduced Voltage Starting
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2) Motor Protection . q1 |" n g* H( u
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Overcurrent Protection
9 r3 t" d1 z) f& Z- l- O+ f* ?7 AOverload Protection
, G0 t9 d4 W. f G B- O* ~Other Protection (voltage, phase, etc)
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5 r% W/ X2 [7 h( o3) Stopping the Motor . N6 Q, n, c# a! A- s# _! W7 g
4 f {7 M2 [6 j" z4 t; iCoasting 0 x' ^* V, I! V w- K) c; F" S, `
Electrical Braking
6 Z" Y- A8 Z9 d- uMechanical Braking
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4) Motor Operational Control
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Speed Control / x+ U, L& ?1 n0 J @
Reversing
. y# m7 t4 O" j& KJogging & k" j {+ T" l1 y/ E
Sequence Control |
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