About Motion Control
6-5
KVAL 994-X Operation/Service Manual
Common Motor Drive Control
An adjustable-speed drive is used to control the motor speed and torque by varying
motor input frequency and voltage. A variable-frequency drive (VFD) is used in
KVAL machinery. The figure below shows a block diagram of a typical motor drive
circuit with typical voltages.
Common Motor Drive Control:
PLC
Output
Fuse(s)
Line
Voltage
Motor
(Power)
Motor
Power
Input
Output
Power
Control Circuit
Common
ON
Should measure
Control Voltage
24 VDC here
Should measure
Line Voltage here
Should measure
Line Voltage here
ON
Drive
STF (Forward)
RL
STR (Revers 2)
SD (COMMON)
OFF
OFF
OFF
Run
300
Run Light
should be ON
Should display the
Motor Frequency
FIGURE6- 25. Block Diagram of a Common Drive Control
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