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ELECTRIC MOTOR CONTROLS * o$ V3 ~# b+ {6 F8 p4 `" b/ |
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Once the proper motor is selected, understanding the many various control devices available and
# Z# `0 T! j' B' Z0 Qtheir uses and limitations becomes an important part related to reliable operation and protection of 3 F$ d: T) n2 p# D5 z* C- F- h9 i: d
the motor and the personnel using the motor.
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4 N' z' L1 ], b0 bMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 6 O9 N2 V% I0 I
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 4 I& [6 z# ]; X7 ~( L7 Z
control equipment can accomplish multiple functions from each of the topics or categories. $ u. o8 I: x- Z0 Z
# m, s& t, x ~) F/ o1 O2 W7 @* V0 tThe four categories include:
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1) Starting the Motor / @6 T! B7 ~: R! |8 h
! E3 i' p6 _ Y, m/ P3 CDisconnecting Means
/ T F" V. U1 H; ^/ g: ?, e: g' v. BAcross the Line Starting
7 c5 o T1 V+ c$ l6 rReduced Voltage Starting 6 S% z* ^7 B: p! q/ B, n. b
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2) Motor Protection . |1 M* k! R+ H% E3 n
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Overcurrent Protection " v+ l$ [, n$ \4 E
Overload Protection 1 |+ N$ ]5 L) n5 C1 U
Other Protection (voltage, phase, etc) " o: t; |4 `5 X0 W3 }, O
Environment $ D4 F& c, U. L V( ?
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7 Q7 T1 e. W- |) e! P3) Stopping the Motor
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Coasting ' `4 L( s" H; k. C1 s( m
Electrical Braking
2 b# J; j- x% ]( `" r0 jMechanical Braking . P' C% U. P# p/ o+ Y% w! a ?* D
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4) Motor Operational Control ' m% e9 y3 q6 ~! V* v. P+ r
( w ^; Z' v# q. _( l9 @Speed Control : o2 k, k4 |% D5 q5 m" Q! Y% S
Reversing
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Sequence Control |
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