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5.0 Operation
5.1 RELIANCE Intelligent Lighting
The RELIANCE Intelligent Lighting (IL) system is designed to provide individual control and monitoring of airfield lighting
using the series circuit as a means of communicating status information from airfield lights and sensors. The same concept is
used for lighting control providing the foundation for SMGCS or A-SMGCS, which includes for example automation of stop
bars with or without sensors, taxiway guidance (routing) in combination with status monitoring. For more information, see
RELIANCE IL documentation.
5.2 RELIANCE IQ and the 2A Concept
The RELIANCE Intelligent Lighting (IL) system, using the IQ products, is designed to provide selective switching and/or
monitoring of airfield lighting by use of an addressable switching unit inside each individually controlled light fixture. A
RELIANCE IQ light fixture is connected to the secondary side of a standard series circuit isolation transformer.
Communications to/from a RELIANCE IQ light fixture uses a unique power line communication technique developed by ADB
SAFEGATE where the communication signals are superimposed on the series circuit current.
In a 2A system the CCR is set at a constant 2A current and the RELIANCE Intelligent Lighting system manages the intensity
level of every single RELIANCE IQ light fixture. Furthermore, the RELIANCE IQ light fixtures could have different light intensity
levels in the same circuit.
5.3 Sensor Interface Unit (SIU)
Sensors for presence- and direction detection of aircraft and vehicles on the airfield can easily be interfaced to the RELIANCE
Intelligent Lighting system using an SIU. The SIU communicates the detect/no-detect status signals as well as its own status
to the series circuit in the same manner as the RELIANCE IQ. The SIU is also connected to the secondary side of a standard
isolation transformer using a standard 2-pin FAA-style connector. Connection to the sensor is established using an IP68 rated
7-pin connector. The SIU can also supply the sensor with DC-voltage from a built-in current to voltage converter.
5.4 Network Concentrator Unit (NCU)
The NCU concentrates all incoming status information from the field, both lamp and sensor statuses. The NCU includes
redundant capability.
5.5 Series Circuit Modem (SCM)
The SCM is an interface to the series circuit which receives command from an NCU. The SCM connects to the series circuit via
a standard isolation transformer and to an NCU via standard RS485 or RS232 serial communication.
5.6 Series Circuit Filter (SCF)
The SCF is connected across the Constant Current Regulator (CCR) series circuit output and is used to contain the
communication signaling within the airfield circuit and minimize feedback into the regulator.
5.7 Control System Interface
The NCU operates as RELIANCE Intelligent Lighting (IL) main interface interpreting commands sent from the Host/Supervisor
system and in turn controlling the appropriate RELIANCE IQ as directed. It maintains all lighting and error status, sensor
detection as reported from the airfield components and is the central point of RELIANCE IL as operated from each vault.
Individual light fixtures can be grouped in lighting segments spanning one or more series circuits, for example an interleaved
stop bar. In turn, the NCU provides alarm status for percentage and adjacent lamp failure within those defined lighting
segments per requirements for low visibility operations. Airfield lighting and RELIANCE IL component status are constantly
monitored and updated to the Host / Supervisor system upon occurrence.
UM-5027, Rev. 1.0, 2020/12/10 17
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