LED LAMP ALARM RELAY
The SCR9L is a universal lamp alarm relay designed to sense the
failure of flashing or steady LED beacon lamps or obstruction
lamps. The SCR9L 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.
When a lamp fails, the SCR9L 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 SCR9L
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 LED‘s. It does not change the calibration