Current-relays STW 200 monitor AC-currents for falling below an adjusted limit. The ranges 12 ... 120 mA and 0.1 ... 1 A allow the monitoring of LED-Lamps as well as incandescent lamps in obstruction lights. In case of main lamp failure a relay switches on the reserve lamp. An alarm contact is available for signalling a lamp failure.

Application

Monitoring of LED-Lamps or light-bulbs in twin obstacle lights with alarm (lamp failure) and switching on a reserve lamp. Monitoring of the function of single obstacle lights. At conventional solutions with a change over contact, there is a short on-pulse at the reserve lamp every time when the system is switched on. The STW 200 switches it on only in case of a failure of the main lamp. LED-lamps can also be monitored with long cables between relay and lamp. When monitoring LED-lamps a total failure is detected. Failures of single LEDs are not detected.

• Measuring input 12…120 mA for LED-lamps
• Measuring input 0,1…1 A for incandescent lamps (bulbs)
• Adjustment range 10…100%
• Relay for switching on reserve lamp in operating current mode
• Relay for Alarm in closed current mode
• Cable-length from relay to lamp up to 500 m
• Display green = o.k., red = low current alarm
• Housing 70 mm wide, mounting height 55 mm