Rockwell 70-602, Technical Manual

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T H R E E P H A S E L V C M A G N E T I C M O T O R S T A R T E R
Fig. 13 illustrates the standard three phase LVC mo-
tor starter.
The three phase starter consists of four basic compo-
nents:
(1) overload block with heaters, (2) magnetic
c o n t a c t o r , ( 3 ) t r a n s f o r m e r , ( 4 ) s t a r t / s t o p s t a t i o n .
The start/stop station is not shown in Fig. 13. Nei-
t h e r a r e t h e i n p u t c o n n e c t i o n s f r o m t h e s t a r t / s t o p
s t a t i o n a n d t h e i n p u t c o n n e c t i o n s f r o m t h e t h r e e
phase motor or power supply.
A wiring diagram and schematic diagram of the three
phase LVC magnetic motor starter is shown in Fig. 12.
F I G . 1 3 – S T A N D A R D T H R E E P H A S E M O T O R
S T A R T E R
T h e w i r i n g d i a g r a m i n d i c a t e s t h e r e l a t i v e p h y s i c a l
l o c a t i o n o f e a c h c o m p o n e n t , w i r e , a n d t e r m i n a l ;
whereas, the schematic diagram does not show the
physical relationship of the components. The sche-
matic diagram does show in straight line form the cir-
cuit functions of the various components.
The three phase LVC motor starter is comprised of a
power circuit and a control circuit. The diagrams in
Fig. 12 illustrates the power circuit with heavy lines
to represent heavy gage wire sized for the motor cur-
rent; whereas, the control circuit is shown with light
lines in the diagrams to represent light gage wire sized
for control current. In the motor starter, the power
circuit is wired with black wires, and the control cir-
cuit is wired with red wires.
Fig 10 - Three Phase (LVC) Motor Starter
1 2