© 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

SCR9L

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 mm2) wire or two 16 AWG

(1.3 mm2) wires

Protection

Circuitry

Encapsulated

Environmental

Operating / Storage

Temperature

-40° to 60°C / - 40° to 85°C

Weight

≅ 3.9 oz (111 g)