Kval 994-X - Typical Positioning Systems

About Motion Control
KVAL 994-X Operation/Service Manual
6-4
Typical Positioning Systems
Common Contactor Control
Unlike general-purpose relays, contactors are designed to be directly connected to
high-current load devices. Contactors are designed to control and suppress the arc pro-
duced when interrupting heavy motor currents.The figure below shows a block dia-
gram of a typical contactor circuit with typical voltages.
PLC
Output
Fuse(s)
Line
Voltag e
(Power)
Motor
Contactor
Control
(Coil)
Input
Power
Input
Power
Output
Control Circuit
Common
ON
Should measure
Control Voltage
120 VAC here
Should measure
Line Voltage here
Should measure
Line Voltage here
Should measure
Line Voltage here
ON
Relay
120 VAC
DC -
Should measure
24 VDC here
Control Voltage
FIGURE6- 24. Block Diagram of a Common Contactor Circuit