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ELECTRIC MOTOR CONTROLS % l: B4 _5 h% \: `2 h* x
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Once the proper motor is selected, understanding the many various control devices available and
4 u+ k7 m4 Q1 t( }. wtheir uses and limitations becomes an important part related to reliable operation and protection of ( u* L p M' F& D$ Z) I
the motor and the personnel using the motor. # ?+ m( ]; [" G# l
" U0 T. p: \& i) ~, w) H5 vMotor Control Topics
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There are four major motor control topics or categories to consider. Each of these has several
& i6 n5 z2 m# p9 [5 \% B' U0 Wsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor ) [) U* P: c" V. o* |$ G
control equipment can accomplish multiple functions from each of the topics or categories. 6 l' |7 l. d( O- x
/ h1 x+ f( s; X! S$ fThe four categories include: 1 T( \2 o# M7 f
# F- ~) |. p' a* M# y' B! X1 j2 N1) Starting the Motor
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Disconnecting Means
1 K% f3 E1 X# G. qAcross the Line Starting 2 G4 L5 F! O( N8 [
Reduced Voltage Starting + |: b. y0 `$ z N
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2) Motor Protection 5 c6 A/ ?% F! O; J; _5 R9 b. C
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Overcurrent Protection
, z" _) e4 e. Z: X0 M# n6 COverload Protection # l2 N' U1 R' q% U2 k9 Z5 C
Other Protection (voltage, phase, etc)
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, H$ J6 |8 ] [: H* X. z3) Stopping the Motor . X! R( _$ q+ ^, b7 y+ S8 s4 }
2 j8 Z# Z# K' p+ Y) m0 V# @' {Coasting 3 Q" _" u8 V1 A- {
Electrical Braking
% M, c: A+ t& K2 x. x6 _; IMechanical Braking
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* t5 I# ^/ V' |4) Motor Operational Control % _2 n; J6 g" e1 F; h$ k1 ^
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Speed Control - g2 I) L* ^ Z1 W& Z
Reversing / Z# [8 m7 Q! A# A+ @
Jogging 3 l1 A5 o( T7 B. ^" d3 c- R4 L
Sequence Control |
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