Bray 71 Seires - Auxiliary Signals; Power - Required Connection; Limit Switch Header - Required Connection; FB Pot Header - Required Connection

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Series 71 – Modulating Controller - Electric Actuator
Installation, Operation and Maintenance Manual
 Auxiliary Signals
Connection for the auxiliary switches which indicate to the customer when
an end of travel set point has been reached Auxiliary switches are voltage-
free contacts and powered by the customer Signal power is applied via the
auxiliary common terminal and the customer reads a switched voltage signal
from the auxiliary closed or auxiliary open terminal There are no interposing
electronics systems and the associated header provides a direct connection
to these switches Signal protection must be provided by the customer

Power - Required Connection
Power connection that energizes the S Servo and powers the actuator
under control The voltage supplied should be based on the actuator
nameplate voltage and the voltage listed on the S Servo label
The S Servo has an onboard protective fuse that is in line with the input
power connection This protective fuse is rated for A

Limit Switch Header - Required Connection
Connections for the travel limit switches which indicate to the S Servo
when an end of travel set point has been reached The S Servo provides
a logic level voltage at the Open and Close terminals of this connection
Once one of the travel limit switches is engaged the switch at the applicable
connection will engage and pull this pin to V signaling the S Servo to
end travel
For proper operation both travel limit switches should not be engaged
at the same time This would prevent the S Servo from operating the
actuator and results in a fault condition
NOTICE
Low voltage actuator connections are powered by the S Servo An external source
should never be connected to these terminals

FB Pot Header - Required Connection
Connections for the feedback potentiometer used by the controller to
determine the position of the valve
The S Servo provides a logic level voltage across the potentiometer and
then monitors the voltage that is returned on the wiper connection The
wiper voltage will change as the potentiometer is turned due to the rotation
of the cam shaft During autocalibration the S Servo can save the wiper
voltage range and use it to position the actuator accurately and precisely
NOTICE
The S Servo has been programmed to monitor within a specific range of feedback
voltage (V-V) Utilizing a potentiometer other than the factory provided
potentiometer may result in unexpected behavior