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ELECTRIC MOTOR CONTROLS |; [; U& l+ M ~3 V% B: S
& p- B6 g @5 ~4 \7 i9 j: o$ o. J% O- YOnce the proper motor is selected, understanding the many various control devices available and " }. m4 }, e" L7 [
their uses and limitations becomes an important part related to reliable operation and protection of
0 z" Q1 E1 |, }3 Hthe motor and the personnel using the motor.
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- U+ I4 a# w1 ]) d! GMotor Control Topics 6 B1 J- Y: T* \1 k* q- |
% ?& F& L: W6 v" m/ x6 v& uThere are four major motor control topics or categories to consider. Each of these has several
1 g: a; u! m8 y/ v3 zsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 \% Q% y4 V M; ]5 v8 Lcontrol equipment can accomplish multiple functions from each of the topics or categories.
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0 x; V' o. m0 t# vThe four categories include: / l+ E6 i! b& P7 m* Z, P6 {0 K
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1) Starting the Motor
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5 Q3 U$ s9 W) {( SDisconnecting Means
: M* q. ~' Y; n" UAcross the Line Starting
' ^& }' Y$ F4 a5 N9 v; [9 AReduced Voltage Starting
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! C9 ], f8 u% f/ _2) Motor Protection
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: M# W0 Z) Y# C, G, J5 KOvercurrent Protection
* } A1 p, N* @- j5 r/ QOverload Protection 9 v' \. h' Y0 X. j4 Y
Other Protection (voltage, phase, etc)
. _; Z0 j" H6 r! U# a: z m* rEnvironment
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3) Stopping the Motor
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- b4 e z' e- K! H* c1 [$ `Coasting
6 ?' D7 o% c; W# S/ ^Electrical Braking 8 G# v K& I" o. M+ Q
Mechanical Braking + c) A$ Z0 K; d
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4) Motor Operational Control
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Speed Control ' h4 X7 U/ k$ ] M8 L/ \
Reversing ; D+ P/ c3 \7 y
Jogging * v9 }: x: M5 F9 x1 l$ L6 G
Sequence Control |
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