The CCR local control
Local control lets an engineer operate a CCR at the cabinet. It is used for testing and maintenance, and it must be returned to remote when the work is done.
1Two ways to command a CCR
In remote mode the CCR follows commands from the control system, such as the ALCMS. In local mode it follows the switches at the unit. Only one source is in control at a time.
2Why local control exists
It lets an engineer switch the output on, off or to a chosen step at the cabinet for testing, fault finding and maintenance, without the control system. It also gives a way to operate if remote control is lost. Inform airfield operations before taking a CCR to local control, and check that the series circuit is complete (no open loop) and that nobody is working on it before switching on.
3Return it to remote
A CCR left in local mode ignores the control system, so the lights may not follow the air traffic controller. Always return the selector to remote and confirm the step before leaving the site, and tell airfield operations it is back in remote.
| Element | Detail |
|---|---|
| Remote mode | CCR follows the control system |
| Local mode | CCR follows the switches at the unit |
| Brightness step | Selected locally or sent remotely |
| Output on/off | Switched at the CCR in local mode |
| Safety | Isolate and lock out before touching the circuit or opening the cabinet |
| After work | Return to remote and confirm the step |
Frequently Asked Questions
Q1What is the difference between local and remote control?
Local means the CCR takes commands from its own switches. Remote means it takes commands from a control system such as the ALCMS.
Q2Why must the selector go back to remote?
In local mode the CCR ignores the control system. If it is left there, the lights will not follow normal operational commands.
Q3Can I work on the circuit with the CCR in local mode?
Local mode is not isolation. Isolate and lock out the CCR before working on the series circuit, because the output can carry dangerous voltage.
Q4Does the ALCMS show local mode?
Many installations report local or remote status to the control system. It depends on the interface; check the site documentation.
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