Overview

The procedure for single intensity operation is essentially the same for all CCRs whether they are three or five-step regulators (Style 1 or Style 2). Most single intensity runway approach strobes operate at High intensity, although the system could also be set up for a single intensity of Medium or Low. The level of current required to achieve the full level of a High intensity flash varies with the type of waveform produced by the CCR. Full intensity can be achieved at only 4.8 rms amperes if the CCR waveform is sinusoidal. A minimum of 5.5 rms amperes may be required if the waveform is pulsed. Thyristor (SCR) CCRs produce pulsed waveforms; most others are sinusoidal. Setting the system to operate at the lowest permissible level of current reduces the strobe system load on the Series Lighting Circuit.

Procedure

1. Set the CCR to the level of current at which you want HIGH intensity flashing to begin (minimum of 4.8 or 5.5 amperes, depending on the CCR Style).

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).

3. At PCB-101, (See Figure 7) adjust the HIGH potentiometer fully clockwise, and LOW & MED potentiometers 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. Now carefully adjust the LOW potentiometer CW until its adjacent LED comes on. Flashing should begin at High intensity.

5. Do not adjust the MED potentiometer. It must remain in the fully CCW position.

6. Do not adjust the HIGH potentiometer. It should be left in the fully CW position.

7. Set the CCR (whether 3-step or 5-step) to the next lower step. The LOW LED should extinguish, and the strobe should stop flashing. If it does not, adjust the LOW potentiometer incrementally CCW until it does.

8. Test the adjustments by observing the results as the CCR is switched from one step to another, and make any necessary re-adjustments to the LOW potentiometer.

9. No adjustments are required at a slave unit.

 

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