SNS20-28C Actuator with Internal Battery Back-up Installation, Operation & Maintenance Manual
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PRODUCT DESCRIPTION:
The SNS20 – 28C Safe & Secure Series Actuator is a quarter turn Open/Close Actuator with Battery
Backup Power –
ALL IN ONE!
No more mounting a separate Fail Safe Unit to provide power in case of
external power failure. The actuator’s internal battery will provide power to the motor in the event of an
external power failure. The actuator can be configured in the field for FAIL OPEN or FAIL CLOSE.
This new series of actuator can operate loads from 2000 in/lbs. to 2800 in/lbs. These actuators can be
ordered to operate on input voltages of 115vac/230vac, 24vac/24vdc or 12vdc and are enclosed in a
SINGLE standard “L” series NEMA 7 style housing.
Switching from external power to battery power is seamless – when the external power source fails, the
internal transfer circuit switches to battery power automatically without any operator intervention.
Depending on the fail position setting that the operator has pre-selected for the actuator, the actuator will
drive the valve to that position. Once the external power is restored, the actuator will automatically switch
back to external power, and the battery will begin to re-charge automatically! The actuator will then return
to its last position before the power had failed.
This unit is available as a Standard OPEN/CLOSE Actuator or with the Modulating Option for precise valve
position control using 4-20mA, 0-10V or 1-5V external input signal. Position feedback is available for both
the standard and the modulating models.
A variety of other optional features are available for these actuators including but not limited to: Aux. Limit
Switches, Motor Brakes, Additional Conduit Entries, Mechanical Stops, Temperature and Condensation
Controls. Speed Controls & Timers are available mounted in a separate enclosure.
UNIT SPECIFICATIONS:
Enclosure rating:
NEMA 4 Standard; NEMA 4X & NEMA 7 also available
Motor Duty Cycle:
100% Standard
Weight:
40 Lbs.
Mounting Pad:
ISO 5211 F10 BC 4.015”
Operating Voltages:
115vac/230vac, 24vac/24vdc, 12vdc
Incoming Power Fuse:
TR5 Pico Fuse, 250V / 10A
Motor Fuse:
10A Glass Cartridge, Slow Blow 5x20mm
Power:
120 Watts Max. / add 20 Watts for optional heater
Position Indication:
Dome Style Visual Indicator
Battery:
12vdc, 1.4AHr
Battery Recharge Time:
Approximately 8-10 Hours
Battery Life on Trickle Charge:
4-5 years
Auxiliary Switch Rating:
Dry Contact, 15 Amps @ 250vac
Input Signal Contact Rating:
Internally Generated – (12vdc @ 1A)
Temperature Range:
-40°F to 150°F
Heater and Thermostat required below 0°F
