Overview

It is likely that the switching levels will have to be fine tuned upon installation due to specific conditions at your site such as the type of CCR in use and other loads that may be driven by the same CCR. Adjustments are made at the CSM-112 Current Sensing Module in the Master Unit

Procedure

1. Set the CCR to Step 1 (2.8 amps).

2. Open the cover to the master unit, and set the interlock switch to the ‘service’ position (pull up on the stem of the switch). The unit may or may not begin to flash depending the existing PCB-101 potentiometer adjustments.

3. At PCB-101 (See Figure 7), adjust all three potentiometers, LOW; MED; & HIGH, fully counter clockwise (CCW).

• If the unit had been flashing it should now stop flashing, but PCB-1 (the main circuit board) should still be active.

4. Carefully re-adjust the LOW potentiometer CW until its adjacent LED comes on. Flashing should begin at Low intensity.

• If the unit fails to flash it may be necessary to proceed to the Troubleshooting section of the manual on Page 17.

5. Set the CCR to Step 2 (3.4 amps).

• The LOW LED should remain on and flash intensity should be unaffected.

6. Set the CCR to Step 3 (4.1 amps).

• Carefully adjust the MED potentiometer CW until its adjacent LED comes on. The unit should switch to Medium intensity flashes.

7. Set the CCR to Step 4 (5.2 amps).

• The MED LED should remain on and flash intensity should be unaffected.

8. Set the CCR to Step 5 (6.6 amps).

• Carefully adjust the HIGH potentiometer CW until its adjacent LED comes on. The unit should switch to High intensity flashes.

9. Set the CCR back to Step 4.

• The HIGH LED should turn off. If it does not, adjust the HIGH potentiometer incrementally CCW until the LED turns off. MED & LOW LEDs should remain on, and the unit should flash at Medium intensity.

10. Set the CCR to Step 3.

• There should be no change from the conditions in Step 9.

11. Set the CCR to Step 2.

• The MED LED should turn off. If it does not, adjust the MED potentiometer incrementally CCW until the MED LED turns off. The LOW LED should remain on and the unit should flash at Low intensity.

12. Set the CCR to Step 1.

• There should be no change from the conditions in Step 11.

13. It is advisable to run through the CCR steps once more to verify that switching is correct. Make any necessary adjustments to the potentiometers to achieve correct switching by repeating the steps above.

14. No adjustments are required at a slave unit.

L-849-V-A/E / L-849-I-A/E Unidirectional Runway Approach Lights