SCR9L Series
The SCR series is a universal lamp alarm relay designed to sense the failure of flashing or steady LED beacon lamps or obstruction lamps. The SCR Series energizes when one or more lamps fail. It will monitor the operation of one to eight beacon or obstruction lamps. All monitored lamps must be the same wattage and voltage When connected to a site monitoring system, it provides the remote lamp monitoring protection required by the FAA-AC No: 150/5345-43E.
Operation
When a lamp fails, the SCR Series senses a decrease in current flow. After a 10s trip delay, the onboard LED
glows and the two alarm outputs energize. The outputs and the LED are reset when the failed lamps are replaced
and the unit is recalibrated. The SCR will sense an open flasher, it will not sense a continuously ON flasher (see
FB Series). Removing input voltage de-energizes the output and the LEDs. It does not change the calibration.
Calibration
The alarm relays must be calibrated after initial installation and each time the LED lamps are replaced. In order to calibrate or re-calibrate the alarm relay, the internal memory must be cleared.
Clearing Memory:
Remove input voltage, transfer the calibration switch to the off position, re-apply input voltage. The LED will flash Red to indicate the memory is clear and the relay is ready for calibration.
Features:
- Monitors LED lamps for failure
- Senses failed flashing or steady beacon or
obstruction lamps
- Switch selectable number of lamps
- Isolated, 10A, SPDT alarm output contacts
- 5A, NO line voltage alarm output
- Self calibrating; no fine adjustment required
- Meets FA-AC No: 150/5345-43E
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