Theory of Operation
The Advanced Control Equipment (ACE2
™
) represents the heart of ADB SAFEGATE's airfield lighting distributed control
system. Distributed control technology has many advantages over traditional central control, including but not limited to:
cost-effectiveness, system expandability, ease of maintenance, ease of installation, interchangeable parts, and ease of
troubleshooting. In a distributed control scenario, each ACE2 unit is locally installed at or near a controllable item (CCR,
Generator, ATS, etc.). Each ACE2 would, in turn, talk with the airfield lighting control network and execute remote lighting
commands. Multiple ACE2 units can be daisy-chained together, making system expansion very easy.
The ACE2 is a universal device that can be used to control any type of CCR and/or controlled element regardless of the
manufacturer. The printed circuit boards are mounted inside a small and rugged environmental enclosure that can be
mounted on top of the CCR, wall mounted or directly attached to the door of an ADB Safegate L-828 CCR.
The ACE2 consists of a microprocessor-based module(s) that includes all of the communication, control commands, input/
output interface, and fail-safe functionality for the controlled element.
The ACE2 is ADB SAFEGATE' second generation distributed control/monitor system. ACE2 network communications are
compatible with ADB SAFEGATE's first generation system simply called ACE. Thus ACE and ACE2 units can be connected on
the same distributed network.
Communication
Each of the ACE2 units connected to a CCR or other controllable device will have a unique factory set number and a field
programmable communication address. This address is used by the ADB SAFEGATE L-890 ALCMS to direct lighting
commands to the corresponding ACE2, which in turn executes the commands and returns the operational status of the
element back to the ALCMS.
Each ACE2 is connected to redundant communication networks via two RS-422 serial communication ports located on the
main printed circuit board. The ACE network is comprised of a communications server and all the daisy-chained ACE2 and
ACE (if present) units in the lighting vault. Both the ACE2 and ACE devices can be connected to the same network. The
communications server stays in constant communication with all the ACE2 and ACE units in both of the networks while at the
same time staying in constant contact with the main ALCMS network. This communications protocol dictates that the local
ACE2 store all data and parameters specific to the controlled element. This characteristic frees up the ALCMS computers from
having to store the parameters for each of the controlled elements. The result of this is real-time communication between all
of the ACE2 and ACE units and the rest of the ADB SAFEGATE L-890 ALCMS, even if a network connection fails in one of the
ACE2 or ACE units.
Input/Output Interface
The ACE2 incorporates an input/output interface that supports full FAA L-827/L-829 CCR control monitoring capabilities. The
pluggable terminal blocks provide an easy-to-service point of connection.
The latching output relays can be configured to control CCR brightness steps or simple ON/OFF control as required by the
controlled element. The input lines can be configured to monitor any external event that is determined by a discrete dry
contact closure. Some examples include generator monitoring, monitoring of Automatic Transfer Switch position, and control
of Circuit Selector Switch loops. In addition, the ACE2 can be optionally expanded to perform CCR input voltage and current
monitoring as well as airfield circuit cable Insulation Resistance Monitoring.
Fail-safe Functionality
Each ACE2 unit provides a self-contained fail-safe feature. This feature insures default airfield lighting operation in the event
of an L-890 ALCMS component failure or even a complete ALCMS failure. In addition, each ACE2 can monitor its output and
verify that the proper command is executed. The fail-safe system also permits maintenance of portions of the control system
without changing the operational status of the lighting system. The fail-safe system is by definition only used in the ALCMS
modes, and must be set up by a qualified ADB SAFEGATE technician.
The fail-safe mode of each ACE2 unit is defined per requirements of the airport/owner. The fail-safe modes are as follows:
Latching Fail-safe Mode:
This mode is executed as follows:
•
If the CCR was switched ON before the failure, it will remain ON at the same brightness level.
•
If the CCR was switched OFF before the failure, it will remain OFF.
Simple Fail-safe Mode:
Advanced Control Equipment (ACE2)
Introduction
6
Copyright
©
ADB Safegate, All Rights Reserved
Содержание ACE2
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