5
Series 71 – Modulating Controller - Electric Actuator
Installation, Operation and Maintenance Manual
4.0 DESCRIPTION OF OPERATION
The Bray Series Servo provides complete modulating control and
monitoring of the Bray Series Electric Actuator The basic function of the
S Servo is to position the S Actuator in response to a command signal
from a process controller The process controller contains a desired process
set point 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 S 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 S Servo to maintain the process at the desired set
point
The command signal to the S Servo can be various DC voltage ranges (-
V -V -V) or a -mA current source The S Servo simultaneously
provides a feedback output signal representing the current actuator
position The retransmission output signal reported by the S Servo can
also be various DC voltage ranges (-V -V) or a -mA current source
These settings along with specific operating modes are enabled by three
simple pushbuttons
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