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ELECTRIC MOTOR CONTROLS ) A# {# I: b' P/ R6 l! M
2 o: }+ q k5 u" e1 Q5 j! POnce the proper motor is selected, understanding the many various control devices available and 2 k2 s( G' x# ?6 A5 x
their uses and limitations becomes an important part related to reliable operation and protection of
0 c- G1 i; K# ?- i Q8 S g, I9 E2 r3 f, \the motor and the personnel using the motor. ' b0 Q0 d0 w6 C
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Motor Control Topics
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; q; B5 I% O& I" W+ uThere are four major motor control topics or categories to consider. Each of these has several
3 Y' S$ O6 r: c" Q9 |$ \subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
! V7 i% E5 m3 B4 u" O' I( H; scontrol equipment can accomplish multiple functions from each of the topics or categories. ! D8 I' _# w) a1 Q" ]
$ ]& f6 b8 S/ _& VThe four categories include:
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; V& P h" s5 t& R6 B. v0 r7 l1) Starting the Motor 8 a6 V" e! C3 h- _
- g/ Y" ?' y3 I0 dDisconnecting Means * c$ _/ j, e7 K. {5 P
Across the Line Starting : z/ k. `( J; d* o" O* [ C
Reduced Voltage Starting ! D) k0 S* `3 n: V' J% p
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2) Motor Protection
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Overcurrent Protection
9 g1 y! `( q: [* {7 J# y* lOverload Protection " l8 p% t; e/ @7 f2 M, Q
Other Protection (voltage, phase, etc)
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3) Stopping the Motor 1 m/ x9 }7 q4 C, t4 j
. \' U4 O1 X+ m4 p% {0 c, x7 WCoasting ( N. J& H+ k# i- ?
Electrical Braking $ i$ S1 C0 |7 x- `3 Z& w6 W
Mechanical Braking
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4) Motor Operational Control
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Speed Control # c U' g; C a& o9 ?
Reversing 1 o+ S' M/ N/ g: X/ F+ S1 _9 A
Jogging
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