SNS20-28C Actuator with Internal Battery Back-up Installation, Operation & Maintenance Manual
Page 16
For example, if the actuator is moving towards the Open position with the Fail Switch on the SNS
Board set for CLOSED, the actuator will STOP, and move to the Closed position if the external
power should fail.
On the Modulating version, the actuator operates the same as the standard version, except the
FAIL position is set by the DIP Switches on the Modulating Control Board.
On the standard version, when the incoming power fails, the Blue LED on the SNS Board will turn
OFF and the Yellow Battery LED will turn on. Also, the battery status LED (Green or Red) will
illuminate to show the charge level of the battery. If the Green LED is on, the battery is at full
power, but if the Red LED is illuminated, the battery power is low and will need to be charged. If
neither the Green or Red LED is lit under battery power, the battery is completely dead and will
need to be replaced. In this instance, the Yellow LED will not light either.
On the Modulating version, when the incoming power fails, the Blue LED on the SNS Board will
turn OFF and one of the battery status lights will turn ON (Green or Red). There is no Yellow LED
on the Modulating SNS Board.
There is a battery charge circuit built into the Safe & Secure actuator that will charge the battery
when the external power is on. After a full 8-10 hour full charge, the Green battery status LED will
illuminate. If after 8-10 hours of “on board” charging, the Red LED remains on, then the battery
needs to be replaced.
If the battery is too low, the actuator will FAIL in place.
The Standard SNS unit will indicate direction of operation (OPEN or CLOSE) by lighting the OPEN
(Green) or CLOSE (Red) LED. If, for instance, an OPEN signal is delivered to the actuator, the
OPEN Green LED should turn on and the actuator should move to the OPEN position. If that
Green LED turns on and the motor does not move, then the Motor Fuse has blown.
The Modulating version SNS will indicate OPEN and CLOSE motion by lighting the Red (OPEN)
and Green (CLOSE) LEDs on the Modulating Control Board, DMC-102.
If the Optional Heater and Thermostat have been installed, the Heater will operate when the
external power supply is on. If the external power supply should fail and the actuator runs on
battery power, the Heater will
NOT
be operational.
Please see the photos in the previous pages of this manual for the locations of the above
mentioned boards and LED locations.
WARNING: DO NOT CHANGE THE FAIL SWITCH SETTING WITH THE POWER ON!!
POWER OFF FIRST!
WARNING: DO NOT CHANGE THE DIP SWITCH SETTING WITH THE POWER ON!!
POWER OFF FIRST!
