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ELECTRIC MOTOR CONTROLS 6 u+ S3 I) T) J4 t5 T
7 j `7 H" Z, r' C6 z& d& fOnce the proper motor is selected, understanding the many various control devices available and 2 Z9 q' i' l9 I3 P$ o# E4 [
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics $ `& `0 [! ~& M$ _
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There are four major motor control topics or categories to consider. Each of these has several $ h/ j* o5 d Q+ F
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
6 }- A; B5 x( K- Z# i3 I* c2 A7 Wcontrol equipment can accomplish multiple functions from each of the topics or categories.
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: { M# Z( Y: w9 XThe four categories include:
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1) Starting the Motor
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6 g, w- s' B. K( N3 s# X4 xDisconnecting Means
) z- q' P F, [/ ?$ {Across the Line Starting
5 V1 M$ S8 U3 V0 X" H: RReduced Voltage Starting & _# r" W& F: g1 E, k
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2) Motor Protection ; m/ E0 M/ A5 s' \+ E. u
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Overcurrent Protection 5 x+ Z. k$ [* Q" n
Overload Protection 8 Y* ^" ]) H2 l
Other Protection (voltage, phase, etc)
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# G" `8 ?$ u3 N" M+ T8 @3) Stopping the Motor 7 A7 c6 n9 ?9 A0 _) _# j3 f# U" ^
, C2 Q6 W0 y' r1 T, \! D6 M. P) M( l; R- iCoasting
' @7 y& o3 ~6 n& P6 ]" TElectrical Braking ( A' x0 A2 Y0 w3 t
Mechanical Braking & [" b9 w9 ?; |6 s- s2 W# A
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4) Motor Operational Control % I1 }2 R3 `! t. j- ~
( e, X' @3 f4 G6 [# ^ ?& m/ ISpeed Control 4 q/ _6 J% y4 E7 [, [4 R. M
Reversing
0 W1 y5 ~" }/ I2 J( n. }( x E. `Jogging
, M6 ?1 @0 N+ f7 tSequence Control |
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