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ELECTRIC MOTOR CONTROLS . K8 K% v2 `# i# W
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Once the proper motor is selected, understanding the many various control devices available and ; Z+ n1 c9 p: h5 h! N {: x5 h6 h
their uses and limitations becomes an important part related to reliable operation and protection of 5 V2 t) G4 z9 u0 G/ T
the motor and the personnel using the motor.
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Motor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several 8 E. v. m# m7 `& ~+ U
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ) t+ |7 G; k) l9 F5 m
control equipment can accomplish multiple functions from each of the topics or categories.
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' z, y4 s- B, I& W+ [/ K# ~; L2 gThe four categories include: + b1 Y, ?% x. [% x4 K" U. t
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1) Starting the Motor
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Disconnecting Means " Z# [! z& ` A1 r) P1 n# j
Across the Line Starting
5 q6 G7 G3 R4 c) F5 f# qReduced Voltage Starting
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( `% S$ a$ p% D2) Motor Protection
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/ B. S7 A `% y( w7 e6 \5 V7 G: eOvercurrent Protection
u6 j8 P* d" yOverload Protection 3 A9 i. e4 [- c1 K& V
Other Protection (voltage, phase, etc) " X) ]. \1 [ e( ?9 R% n. [
Environment 0 s) u! h7 l5 `. E+ k
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0 y0 n7 e! H* G3) Stopping the Motor z( R8 B; l- ^: t5 w9 Y0 T
& |- q5 H) x0 ?0 |6 ~Coasting 8 W6 R* X* q. {/ f4 a7 p
Electrical Braking ' w+ M. L5 P: a( Y- V4 L A
Mechanical Braking
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- B; L+ A2 {' n3 g) Y: X1 R4) Motor Operational Control : y; c0 ^' k0 k
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Speed Control
3 v! v( ~3 M( t6 y" }Reversing
3 J& i; o3 u l0 ?( e6 [/ W+ U2 |Jogging / q: b2 B- {6 }* l1 y
Sequence Control |
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