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ELECTRIC MOTOR CONTROLS + C' F! C1 r1 }& e& u
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Once the proper motor is selected, understanding the many various control devices available and 0 X5 u% s1 X% e p9 O: `. }
their uses and limitations becomes an important part related to reliable operation and protection of ( d/ { r: q" j, x3 D0 E# k
the motor and the personnel using the motor.
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4 w4 Y, k' t. YMotor Control Topics 0 a( p2 \: I7 }3 z; D0 n# Y" g
4 z/ D/ c: i( M4 IThere are four major motor control topics or categories to consider. Each of these has several ' _5 [, |8 j+ ~4 ], [+ Q
subcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
5 ^+ `5 u; G$ ycontrol equipment can accomplish multiple functions from each of the topics or categories. * V! f& `% T" C# P& j5 c L) m
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The four categories include:
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0 @, v# u7 q- z7 B r! w$ L( z, n1) Starting the Motor ( X5 z \8 E7 A. e. X
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Disconnecting Means
8 t( s5 q7 V5 ^/ i9 k3 ^* nAcross the Line Starting 8 u' w$ h2 Y' W4 Q# Z/ b
Reduced Voltage Starting \8 H8 ^" U% t3 Z
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* n+ Z) X/ c2 Q2 Y( s2) Motor Protection
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2 P1 J/ b6 O- FOvercurrent Protection 5 I: C. }+ o) r; }, l" f, r
Overload Protection 6 F) l5 o" i$ q/ a1 l
Other Protection (voltage, phase, etc) 3 f2 t- r# N" d/ L5 p
Environment 9 q. o/ T8 J/ T, ^6 z3 N
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3) Stopping the Motor ( ]8 v9 }, \& }- z$ v9 j
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Coasting - k# s8 R; E0 P6 G. j, \- h2 a
Electrical Braking / y% h: y% f+ O! ?
Mechanical Braking . ^/ X; I: }, H& X
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; n; o: y% Y- N( ~" H4) Motor Operational Control ( y! x! g" y( S# x" _ B5 c
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Speed Control : N7 v# e* f2 X m
Reversing 3 D8 ~* X5 t4 a% A* z: w
Jogging
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