Self-Contained Dimming Control

Self-Contained Dimming Control DiagramClick to Zoom

A two-step Discrete Dimming annunciator cap is combined with a VIVISUN High Capacity Body and NEXSYS Component Technology to provide an illuminated pushbutton switch that alternates between sunlight and night level illumination each time it is actuated.

This application includes a VIVISUN High Capacity Body containing a single switch pole and a NEXSYS Electronic Latch (EL1) that acts as a 2-step Discrete Dimming selector. The same switch body also contains a (4-Pin) Terminal Block eliminating the need for external splices or junction components.

In the example circuit, the “CNMS, LOI” switch legend powers up in the sunlight readable “Sunlight” level with 28VDC on (Pin-F) and (Pin-G) Open. When the switch is depressed the switch contact (H1) provides ground to the EL1 /TGL input (J2) which activates the EL1 Q output (K2) providing ground to the control (Pin-G) dimming the “CNMS, LOI” legend to the “Aviation Night” (14V- 15 fl) brightness level. At the dim level (Pin-F) is 28VDC and (Pin-G) is ground. When the switch is actuated again the /TGL input causes an opposite state for the Q output (K2) returning the “CNMS, LOI” legend to the “Sunlight” setting.

When the VIVISUN Discrete Dimming option is specified, a dimming control switch must be available to provide the appropriate signal to the control pins. This application provides this package with all NEXSYS Component Technology components contained in a single switch body. This circuit can control and drive up to 50 illuminated legends and the same circuit can also be used to control a lighting test function by providing ground on (Pin-C) when the VIVISUN external Press-to-Test feature is specified.

Disclaimer: The configurations and diagrams shown above are provided by Applied Avionics, Inc. as a general example only. The recipient is solely responsible for actual design, electrical wiring, validation, testing, applicability and functionality of the product in regards to the customer’s specific application.