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ELECTRIC MOTOR CONTROLS 6 D/ C( e& h/ T$ X! v) V: x5 y
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Once the proper motor is selected, understanding the many various control devices available and : v e! Z+ |$ K* i4 b8 E
their uses and limitations becomes an important part related to reliable operation and protection of 4 G0 W( ]% a6 `: _1 [
the motor and the personnel using the motor.
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1 H1 f" c, @/ G/ mMotor Control Topics
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7 m D- N2 k! NThere are four major motor control topics or categories to consider. Each of these has several : t' L, I4 H9 V; u/ L9 f* _
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor 9 d0 f- Q' I" a2 e# g' c5 r' A
control equipment can accomplish multiple functions from each of the topics or categories. 7 O! r8 D1 _% _ C: G
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The four categories include: ) Y; b" D# \1 f- ?: U
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1) Starting the Motor 0 r( j0 |8 f% a' j& E( c
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Disconnecting Means
& u0 p- |, b, ~Across the Line Starting 1 N) n! I& G. _( u7 R/ _
Reduced Voltage Starting
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* c F! Q0 P( A0 t! W2) Motor Protection
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Overcurrent Protection 9 x# O7 t! A) G: R$ o6 \) V7 v
Overload Protection # c9 Q! q/ M; X
Other Protection (voltage, phase, etc) . k% V& f! Z: Q, i
Environment
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" c: T4 _* b) q( E$ R2 M% x3) Stopping the Motor
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5 ^1 E9 w' e& F* O8 T6 |. _! ^" ECoasting
- i7 E' x* A9 Q8 b6 l) o: BElectrical Braking
2 x4 [: k- \8 ?1 ~Mechanical Braking 0 U# G. q4 z6 \9 S
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- f) G- H6 @! w( @$ ^% e0 p2 j4) Motor Operational Control : {6 S: e8 `& [8 Q
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Speed Control ; f5 Y2 n* q# m; k
Reversing
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& E. T8 i/ A" X# c$ {# B( _Sequence Control |
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