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ELECTRIC MOTOR CONTROLS 6 e( w, a8 l( N& n/ r
5 Z3 s" n; i9 U0 m: GOnce the proper motor is selected, understanding the many various control devices available and 4 k7 }0 a$ \9 f3 F6 J
their uses and limitations becomes an important part related to reliable operation and protection of
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Motor Control Topics
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& h8 v- |1 k" |; A8 x, wThere are four major motor control topics or categories to consider. Each of these has several
! a+ Z% V/ i2 F; M9 wsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
0 z* x% C. A0 [' r3 O8 ^4 h/ U! ccontrol equipment can accomplish multiple functions from each of the topics or categories. 9 x+ _4 {( N5 ~% U5 j6 y
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The four categories include:
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1 L6 R0 \/ U1 E# C" E+ ?1) Starting the Motor
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Disconnecting Means
2 M( U7 n# j5 c/ a( }Across the Line Starting
: N1 F( H' W* g3 X Z5 IReduced Voltage Starting
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2) Motor Protection
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1 x& m/ p3 C4 i7 ^5 J" _+ @+ w2 I% |Overcurrent Protection 0 ]' R. _3 V# H
Overload Protection 6 i: k; @2 x2 ~; a3 W# U
Other Protection (voltage, phase, etc)
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3) Stopping the Motor
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& L2 w( l+ i9 }; j: ~Coasting 7 E, B' [; V2 }2 O' u
Electrical Braking 4 T1 F G. O+ }* V3 e3 `8 n
Mechanical Braking
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4) Motor Operational Control , P5 s3 q; z+ Q, x- { Q2 B
0 R' V- |! Y- I( `* N+ Y3 N3 i$ j2 L hSpeed Control " C8 g' v+ z L( ~4 S
Reversing 7 }1 ~" k0 W1 ~
Jogging
6 p2 I; W% f- }& K6 ISequence Control |
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