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ELECTRIC MOTOR CONTROLS
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Once the proper motor is selected, understanding the many various control devices available and 0 l+ Z* t) o7 \5 T% f- K
their uses and limitations becomes an important part related to reliable operation and protection of
: x- H4 b8 w0 i+ O4 Mthe motor and the personnel using the motor.
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& o& d# `% _( C j+ y7 w% K+ AMotor Control Topics 4 Z; C) R0 p% ~# h D4 E: \, ]
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There are four major motor control topics or categories to consider. Each of these has several
; y' _: Y5 y6 Z* Psubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
7 {( ?/ S# Y# D% q* l9 P' acontrol equipment can accomplish multiple functions from each of the topics or categories. / q6 \4 o7 |) \4 A1 ^- Y' i. |4 E
4 e& n3 Y* d9 Y" k' v: E% L- uThe four categories include: 8 }& F2 @3 F# \2 e, t
/ _/ b4 z. }' Z1) Starting the Motor 5 c2 T% _" Z3 |2 [5 `
3 l8 A2 g& [0 [) G& R2 VDisconnecting Means + c5 \6 X, W" u$ p, }9 a! `
Across the Line Starting
- F, |# w# x2 qReduced Voltage Starting
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2) Motor Protection , S: y4 b& T2 V2 _* l. X
T' I& h9 R8 m) i0 yOvercurrent Protection
$ w7 ~& N5 @# R- ~4 h) e% x. }Overload Protection
# y) @+ {/ o2 B; O9 \Other Protection (voltage, phase, etc) ; ^! o& P( g) Z. @
Environment
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3) Stopping the Motor - u7 j" N1 i( L/ y- I- I. [- Z
i- u$ J/ f7 c- fCoasting
, j7 {' j5 ?" MElectrical Braking
# p8 Y+ P$ X# V3 ~# I% ]1 P ZMechanical Braking
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" H9 [- }7 N+ t8 G4 f1 ^' c, s9 N4) Motor Operational Control
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Speed Control
! @5 V) z- j: m" w& N. k. k: zReversing ' U6 f; ~, G: j8 g# j9 ?9 j- Q
Jogging
* ~4 y5 @7 y: Y3 ^/ g2 fSequence Control |
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