Description of Operation
The Servo controller provides complete modulating control and monitoring of the 530
lb-in Electric Actuator. The basic function of the Servo is to position the Actuator in
response to a command signal from a process controller. The process controller
contains a desired process setpoint entered by the user, and continually monitors the
process variable (such as flow rate, tank level, etc.) through some type of sensor.
Varying the command signal to the Servo will cause the actuator to change position,
which will move the associated control valve to modify the process variable. The
process controller continually calculates and transmits the appropriate command
signal to the Servo to maintain the process at the desired setpoint.
The command signal to the Servo controller can be various DC voltage ranges (0-5V,
0-10V, 2-10V) or a 4-20 mA current source. The Servo simultaneously provides a
feedback output signal, representing the current actuator position. The retransmission
output signal reported by the Servo can also be various DC voltage ranges (0-5V, 0-
10V) or a 4-20mA current source. These settings along with specific operating modes
are enabled by three simple pushbuttons.
User Interface
The Servo controller features a rich, LED-based menu that displays both configurable
settings and operational status. Indicators are grouped together based on function,
shown by their respective label(s). Without any user interaction, the Servo will display
the factory default product settings, valve status, and fault status.
Fig. 10: 24V Servo Controller
Product Settings
The product settings determine how the Servo controller will respond to commands
from the process controller. These must be defined and verified before operation
begins. The settings that can be adjusted on the Servo are:
● Input – Input/Command Signal
● Output – Output Feedback Signal
All units ship with default settings from the factory.
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