Managing CCRs and Field Lamps

Runway lighting is critical for safe aircraft movement during low visibility and nighttime operations. Behind the visible glow of the runway edge lights, centerline markers, and approach lights lies a sophisticated system of remotely controlled Constant Current Regulators (CCRs). These devices act as the heartbeat of airfield lighting systems, and they are typically operated from a remote control desk, often located in the Air Traffic Control Tower (ATCT) or airport operations center.

What is a Constant Current Regulator (CCR)?

A CCR is an electrical device that converts a variable AC input into a stable output current, usually between 2.8A and 6.6A, to power the series circuits that run airfield lighting fixtures. These regulators ensure that all the lights in the circuit receive the same current regardless of circuit length or the number of lamps.

Each CCR typically powers a specific lighting circuit—such as runway edge lights, touchdown zone lights, or approach lights—making it essential to precisely control each unit for efficient airfield management.

Remote Desk Control System

A remote desk control system enables centralized operation of multiple CCRs from a single interface. It allows air traffic controllers or ground operations personnel to switch lighting systems on/off, adjust brightness levels, and monitor system status.

Key Control Functions:

• Circuit selection: Choose which lighting circuit to operate (runway 18L edge, taxiway B, etc.).
• Step adjustment: Modify light intensity across multiple preset steps (typically 3, 5, or 7).
• Feedback monitoring: Displays CCR and circuit status—whether operational, faulted, or offline.
• Preset configurations: Quickly activate standard lighting setups for different weather or operation modes (e.g., low visibility).

Control Wiring and Communication with CCRs

Communication between the remote desk and the CCRs is achieved using control wiring or digital communication protocols, depending on system complexity and age.

1. Hardwired Control:

In traditional systems, discrete copper control wires run from the control desk to the CCRs. These wires carry:

• Start/stop signals
• Step control pulses for brightness adjustment
• Status feedback signals

This method is reliable but can become cumbersome with large installations, as each function and CCR requires a dedicated conductor or relay.

2. Digital Control (Modern Systems):

Modern airfield lighting systems use digital control networks such as:

• Modbus RTU/TCP
• Ethernet-based protocols
• Proprietary fiber-optic or serial communication systems

These systems transmit multiple control commands and feedback signals over a single pair of communication cables, significantly reducing wiring complexity and increasing flexibility. This setup also supports SCADA integration, allowing advanced diagnostics and remote maintenance.

Benefits of Remote Desk Control

• Operational Efficiency: Quick switching between lighting configurations based on weather or runway use.
• Safety: Reduces the need for manual intervention at field vaults.
• Real-Time Monitoring: Early detection of faults in CCRs or field lights.
• Centralized Management: Enhances coordination between air traffic control and ground operations.

Conclusion

Remote desk control of runway lighting systems plays a vital role in modern airport operations. By interfacing directly with CCRs via control wiring or digital networks, it allows seamless, safe, and efficient management of airfield illumination. Whether through legacy hardwired systems or modern networked platforms, the ultimate goal remains the same—ensuring safe visibility for every takeoff and landing.