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ELECTRIC MOTOR CONTROLS ; }/ @; \7 G8 U6 D2 t, H6 |6 u$ m; ^( _
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Once the proper motor is selected, understanding the many various control devices available and & L& ?" B* R6 _
their uses and limitations becomes an important part related to reliable operation and protection of
, c" ?* \1 S! m0 S3 Q1 ^ vthe motor and the personnel using the motor. 0 v, z1 \& X9 w0 ~
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Motor Control Topics 6 g6 @2 J4 s- u( f8 M& @) e
- v6 X4 R6 t) c) z) Z( ~There are four major motor control topics or categories to consider. Each of these has several " s3 D7 Y& b- F% `0 E( J* I
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 3 ^0 @( c- Y/ X
control equipment can accomplish multiple functions from each of the topics or categories.
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7 {: ?* I. i7 Z3 h( Z+ XThe four categories include:
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" Z8 X M0 q, q1) Starting the Motor " e1 {$ @9 T& M0 D1 K
7 E4 p0 n( C5 E; y( P& JDisconnecting Means
& a6 K) t: y- ?. M% x$ SAcross the Line Starting + b$ {/ l1 I0 J ?* G2 v$ Q
Reduced Voltage Starting p3 |/ q' Y0 G6 t0 S& i! |6 U
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* a+ i$ s* d! |2) Motor Protection
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Overcurrent Protection 6 \& w7 i+ o ^ b( [! p
Overload Protection - f$ U( k4 [, i, u$ T
Other Protection (voltage, phase, etc)
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3) Stopping the Motor
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Coasting
g' b2 c" m, t+ a) pElectrical Braking
) Y+ m8 l) q C5 r7 Z0 PMechanical Braking $ ]) y6 @( H* I& }& T7 r
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4) Motor Operational Control 4 i: G. D S5 ]* @4 u9 ^
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Speed Control
+ v0 k6 b' H' ^. Y& O& a) s: p2 o QReversing
) d) V) B" l5 v4 Z5 f# Q. LJogging
9 }+ t$ d9 f( Z4 iSequence Control |
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