What is CCR control architecture?
How control of the CCRs is organised — commands pass down from the operator, status and alarms pass back up.
The CCR control architecture is the way control of the regulators is organised. Commands such as on, off and the brightness step pass from the operator at the control position, through the airfield lighting control and monitoring system and a communication link, to the CCR controller. Status and alarms return the same way.
Each CCR can also be operated locally. A local or remote selector decides which is in charge, and local normally takes priority so that someone working at the CCR is not overridden. This is not isolation: the circuit still has to be isolated under the site procedure before work. The control loop inside each regulator is covered under CCR controller.
- Select. The operator chooses on, off or a brightness step.
- Send. The control system sends the command over the communication link.
- Accept. The CCR controller acts on it only if set to remote.
- Act. The controller sets the target current and corrects the power stage.
- Return. The CCR sends back its status and any alarms.
- Display. The control system shows the state and alarms to the operator.
Frequently Asked Questions
Q1What is CCR control architecture?
The way control of the CCRs is organised. Commands such as on, off and brightness step pass from the operator through the control system and a communication link to each CCR controller, and status and alarms come back the same way.
Q2What are the layers of the architecture?
The control position where the operator works, the airfield lighting control and monitoring system, the communication link, the CCR controller in each regulator, and the power stage that drives the series loop.
Q3What commands and status are exchanged?
Commands normally include on, off and the brightness step. Status normally includes the step in use, whether the CCR is on, and any alarms, and in some systems the measured output current as well.
Q4What is the difference between local and remote control?
Local control is operated at the CCR itself. Remote control is operated from the control position through the control system. A local or remote selector decides which one is in charge at a given time.
Q5Why does local control normally take priority?
So that a person working at the CCR is not overridden by a remote command. Selecting local or switching the CCR off is not isolation, however. The circuit must still be isolated under the site safety procedure before work.
Q6How are CCRs connected to the control system?
By hardwired signals, or by a serial or network link, depending on the system design. The choice affects how many signals can be exchanged and how much status is available.
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