SNS20-28C Actuator with Internal Battery Back-up Installation, Operation & Maintenance Manual
Page 13
Limit Switch CAMs
(Bottom = Close;
Top = Open)
–
Loosen
the set screw to rotate for
adjustment.
Auxiliary Switches
(if installed)
Battery Mounting
115/230vac Power
Supply
Battery, 1.4AHr
3) Turn on the Main external power to the actuator.
4) Using the external direction control signal, run the actuator open and closed to verify that
the valve is opening and closing fully. If not, the Open and Close CAMs may be adjusted to
allow more or less motion in both directions. The CAM set screw needs to be loosened to
rotate the CAM. Re-tighten the set screw when the desired valve position is achieved.
NOTE:
If control signal is provided by a PLC relay, program needs to incorporate a delay between the OPEN &
CLOSE signal.
The external control signal is done using a dry contact switch or relay. DO NOT APPLY a voltage to the OPEN or
CLOSED control signal pins. The voltage is provided on terminal #4 via the SNS control board.
Standard Actuator View
of Power Supply
