© 2016 Littelfuse Protection Relays & Controls
Flashers and Tower Lighting Controls
Tower and Obstruction Lighting Controls
www.littelfuse.com/scr9L
Rev: 1-A-062316
SCR9L
Calibration
Alarm relays must be calibrated at initial installation and when
LED lamps are replaced. Due to LED lamp aging, recalibration is
recommended every 12 months.
1. Remove input voltage
2. Move calibration switch to off position
3. Re-apply input voltage
4. LED will flash red to indicate the unit is ready for calibration
5. Visually inspect structure’s lighting to make sure all lamps
and flashers (if used) are operating properly
6. Remove input voltage
7. Adjust lamp selector switches for the correct number of
lamps to be monitored (see adjustment diagram below)
8. Re-apply input voltage
9. LED should flash red
10. Move calibrate switch to ON position
11. The LED will alternate flashing red and green
12. LED will glow steady green within 30 secs.
Calibration is complete
Calibration Failed
If the LED double blinks red, calibration failed. Remove input
voltage and repeat steps 6-8.
Notes:
a. Monitoring a mixture of LED beacons and LED obstruction
lamps is not possible with the SCR9L.
b. This alarm relay is not designed to monitor
incandescent lamps.
c. Applying input voltage when the calibrate switch is in the
OFF position, erases the previous calibration settings. The
LED will flash Red. The output relays are OFF and the unit
will not sense lamp failures.
d. Only one temperature compensated LED beacon can
be monitored with this product. A combination of
temperature compensated and standard LED beacons
cannot be monitored.
Adjustment Example
OFF ON
7.
Example Shown: SCR9L two lamps are ON during
normal operation.
Indicator Table
L Green Input ON & Calibrated
L Green Flashing Trip Delay
L Red Lamp Failure
L Red/Green Flashing Calibrating
L Red Flashing Not Calibrated
Specifications
Sensors
Calibration Range
(total all Lamps) 150mA - 8.0A
Absolute Max Current
(total all Lamps) 15A max. (may not calibrate above 8A)
Single Lamp Current 150mA - 8.0A (total all lamps < 8.0A)
Time Delay
Trip Delay Factory fixed ≅10s
Input
Input Voltage/Tolerance 120 to 230VAC ±15%
AC Line Frequency 50/60Hz
Output To operate a spare lamp or alarm
Line Voltage Output (SPNO) 5A @ 240VAC or 30VDC resistive;
1/4 hp @ 125VAC; 1/2 hp @ 250VAC
Isolated Alarm Output (SPDT) 10A @ 240VAC or 30VDC resistive;
1/4 hp @ 125VAC; 1/2 hp @ 250VAC
Auxilliary Input Voltage (H) ≤ 2A @ 230VAC
Mechanical
Mounting One #10 (M5 x 0.8) screw
Dimensions H 76.7 mm (3”); W 51.3 mm (2.02”);
D 41.7 mm (1.64”)
Termination IP20 screw terminals for up to 14 AWG
(2.45 mm
2
) wire or two 16 AWG
(1.3 mm
2
) wires
Protection
Circuitry Encapsulated
Environmental
Operating / Storage
Temperature -40° to 60°C / - 40° to 85°C
Weight ≅ 3.9 oz (111 g)
