Navitron
Systems Ltd
Command Source Indicator Type NT850 CMDA

The NT850 CMDA provides permanent indication of command source (main panel, aft panel or emergency steering panel) via three green LEDs. The system supplied features two NT850 CMDAs, one mounted in the main panel and one in the aft panel.

The system monitors the main and aft control panels and if an attempt is made to change the steering mode or the rudder angle (WFU wheel or FU lever position) on the panel not in control then the CMDA will signal an alarm via a flashing “MAIN” or “AFT” red LED accompanied by an audible alarm. The alarm is acknowledged and cancelled by pressing the “ALARM CANCEL” key on the CMDA.

Model NT850 CMDA: - (Dims 130mm x 127mm x 89mm)
 
NT850 CMDA Outline Dims & Mounting Details  

If the emergency panel is engaged then the main steering system (both main and aft panels) is shut down for safety reasons. In the emergency steering mode the CMDA is powered from the emergency panel and when this mode is engaged the CMDA will alert the bridge by flashing the “EMERG” LED and sounding an audible alarm, the alarm is acknowledged by pressing the “ALARM CANCEL” key on the CMDA.

The CMDA on the AFT panel will also monitor main steering system alarms and if an active alarm is detected it will flash the “MAIN” LED red and sound and audible alarm, the alarm is acknowledged by pressing the ““ALARM CANCEL” key on the CMDA.

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