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ELECTRIC MOTOR CONTROLS & l6 v4 z- L' N) C5 m2 r4 S
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Once the proper motor is selected, understanding the many various control devices available and
r* ]/ |* A& {: S$ x* Vtheir uses and limitations becomes an important part related to reliable operation and protection of
, U$ i( Z1 L0 } m8 Dthe 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
, b" Q2 P$ {2 i+ Q* gsubcategories and sometimes the subcategories overlap to some extent. Certain pieces of motor
7 i. P2 K2 F3 W5 F7 o% Tcontrol equipment can accomplish multiple functions from each of the topics or categories.
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6 v, d, U( w2 Y! @- _; kThe four categories include: ; b0 w) D; v" g6 {$ o8 B2 Y
( H9 p, O- q% {7 R1) Starting the Motor ) e1 \; q7 B0 V% @; ]
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Disconnecting Means
+ {4 s$ L! @7 n) ]; y- E1 H4 M7 qAcross the Line Starting
3 O2 z% a& i7 ^0 NReduced Voltage Starting
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2) Motor Protection
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Overcurrent Protection 1 Z" I1 E9 F ^2 G
Overload Protection / n& z6 f7 a( Q& }
Other Protection (voltage, phase, etc) : c6 l% E3 T) \( B* ~$ X! c* x2 |
Environment
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$ }! f1 s7 @7 \& b3) Stopping the Motor + {; O6 G! M' D/ s7 n) s+ O' ~+ ?
* \3 h+ e2 }' i: VCoasting 7 s0 n& h( Y% m' L# m
Electrical Braking 8 n, A1 {* b& Q( n" {0 p
Mechanical Braking 7 |9 m- c X6 `+ A p% p- W) y
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% h2 [' `( l, ^/ R4) Motor Operational Control * E! V+ V5 W E9 i: V' y0 W7 y
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Speed Control
1 [8 a5 q* B8 k$ P7 H5 t5 R% s) K* nReversing
* U( s f8 @- |8 y& Z* k# TJogging
0 @. E1 R5 P* B' t. I. {3 PSequence Control |
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