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The SCR490D is used to provide remote monitoring of steady burning incandescent marker and obstruction lighting. Four onboard switches allow operator programming for lighting systems with two through nine lamps on a single AC circuit. The SCR490D uses a toroidal sensor and electronic circuitry to sense the failure of one or more lamps.
Operation
When a lamp fails, the SCR490D senses a decrease in current flow. Then, after a fixed time delay, it transfers to its alarm mode. In alarm mode, the LED indicator, the output relay (SPDT isolated contacts), and a non-isolated solid-state output are energized. Replacement of the failed lamps resets the alarm outputs and the LED indicator. To prevent false alarm signals, power must be applied
Operation
When a lamp fails, the SCR490D senses a decrease in current flow. Then, after a fixed time delay, it transfers to its alarm mode. In alarm mode, the LED indicator, the output relay (SPDT isolated contacts), and a non-isolated solid-state output are energized. Replacement of the failed lamps resets the alarm outputs and the LED indicator. To prevent false alarm signals, power must be applied
- Toroidal current sensing
- Monitors 2 - 9 lamps
- Isolated, 10A, SPDT alarm output plus one 1A, solid-state line voltage alarm output
- Fixed trip delay (6s)
- Allows low-cost monitoring of incandescent marker and obstruction lighting
- Senses failed obstruction lamps on a single AC circuit
- Provide alarm indication and can also be used for remote monitoring of the lighting system
- Prevents nuisance alarms
SCR490D Parts
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