Controlled procedures for the AGL Constant Current Regulator (CCR) and the series circuits it energizes — covering installation, pre-commissioning, controlled start-up/shutdown, local and remote (ALCMS) operation, brightness-step selection, output current/voltage verification, protection and alarm verification, earth-fault and overtemperature monitoring, cooling and control-panel inspection, communication and ALCMS interface verification, series-circuit energization/de-energization, maintenance and full functional testing.
Important — Exact CCR ratings, output-current steps, output-voltage limits, protection settings, earth-fault thresholds, temperature limits, cooling requirements, control logic, communication protocol and ALCMS interface shall be taken from the approved CCR datasheet/manual, project specification, approved electrical design, ALCMS philosophy and applicable aerodrome requirements. Generic values shall not be substituted for manufacturer-approved settings.
To establish a controlled procedure for installation of a Constant Current Regulator (CCR) serving an AGL series circuit.
Verify:
CCR installation shall comply with: Approved Layout + Manufacturer Requirements + Electrical Design + Control Philosophy + Earthing Requirements.
To verify that the CCR and associated series circuit are ready for controlled energization.
Verify:
To establish a controlled procedure for starting a CCR.
Critical Rule — Initial energization shall be performed using a controlled low-risk operating condition appropriate to the CCR manufacturer's procedure.
Critical Rule — Never energize a CCR into an open or incomplete series loop. Confirm loop continuity first — an open loop can drive the CCR output to a hazardous voltage. Never open an energized series loop.
To safely shut down a CCR and associated series circuit.
To define safe local operation of the CCR from its local control interface.
Important — Local operation shall not bypass required ATC/Airport Operations coordination or approved control procedures.
To establish requirements for operating CCRs through remote control/ALCMS.
Critical Check — Commanded status and actual CCR status must agree.
To establish controlled selection of approved CCR intensity levels.
Important — Brightness-step values shall be taken from the approved CCR configuration, not assumed from generic values.
To verify that CCR output current corresponds to the selected operating step.
To verify the CCR output voltage under approved operating conditions.
Warning — Series-circuit CCR output voltage can become hazardous. Testing shall only be performed using an approved procedure and suitably rated instruments.
To verify that CCR protective functions are available and correctly configured.
To verify correct generation, indication and recording of CCR alarms.
Where applicable:
To verify the CCR's series-circuit earth-fault monitoring function.
Critical Rule — Never create an uncontrolled earth fault on an energized AGL circuit for testing.
To verify the CCR temperature-monitoring and protection function.
To maintain adequate CCR thermal performance.
Check:
To verify cooling-fan condition and operation.
To ensure the CCR control panel remains safe and operational.
To verify accuracy and functionality of CCR local display indications.
To verify communication between the CCR and the supervisory/control system.
To verify correct interface between the CCR and Airfield Lighting Control and Monitoring System (ALCMS).
The following chain must remain consistent:
To establish a controlled procedure for energizing an AGL series circuit through a CCR.
Verify:
To safely de-energize an AGL series circuit before maintenance.
To verify series-circuit current at the CCR and assess circuit behavior.
Investigate:
To verify complete series-circuit operation after installation, maintenance or repair.
To establish preventive and corrective maintenance requirements for CCRs.
Electrical
Cooling
Control
Monitoring
To verify complete CCR functionality following commissioning, maintenance, repair or periodic testing.
Verify:
Master CCR workflow, quality hold points, master CCR checklist, common failure modes, critical troubleshooting logic and required records that apply across all 25 Division 13 procedures.
The following sequence should be applied whenever applicable:
Work shall not proceed past a hold point until the associated verification has been completed and released.
The following items should be confirmed before a CCR/series circuit is released to service:
The following conditions should be specifically monitored during AGL maintenance:
Use the following decision chains to isolate the root cause of a CCR or series-circuit fault. Never bypass a protection or interlock function to force a result.
CCR Not Starting
CCR Running But Lights Not Operating
CCR Current Abnormal
ALCMS Command Not Working
The AGL installation/maintenance organization should maintain, as applicable:
"A CCR is the controlled power source of an AGL series circuit, not simply a high-current power supply. Safe and reliable operation depends on correct current regulation, circuit integrity, protection, earth-fault monitoring, thermal management, brightness control, local/remote operation and accurate feedback to the ALCMS. Every CCR command must ultimately be verified against the actual lighting response."
Exact CCR ratings, output-current steps, output-voltage limits, protection settings, earth-fault thresholds, temperature limits, cooling requirements, control logic, communication protocol and ALCMS interface shall be taken from the approved CCR datasheet/manual, project specification, approved electrical design, ALCMS philosophy and applicable aerodrome requirements.
Generic values shall not be substituted for manufacturer-approved settings — approved project specifications and the CCR manufacturer's instructions shall always take precedence.
Technical references behind the procedures in this division:
References are given at document or chapter level for technical orientation. Confirm the current edition, amendments and national adoption (for example DGCA CAR Section 4, FAA Advisory Circulars or EASA material) for each project. Approved project specifications, manufacturer instructions and the airport's own procedures take precedence, as stated in the precedence note above.
Quick answers about CCR & Series Circuit SOPs in the AGL SOP Library.
Division 13 is a set of 25 procedures (SOP-256 to SOP-280, Rev 0) for the AGL Constant Current Regulator and the series circuits it energizes. It covers installation, pre-commissioning, controlled start-up and shutdown, local and remote (ALCMS) operation, brightness-step selection, output current and voltage verification, protection and alarm verification, earth-fault and overtemperature monitoring, series-circuit energization and de-energization, maintenance and functional testing.
From the approved CCR datasheet or manual, project specification, approved electrical design, ALCMS philosophy and applicable aerodrome requirements. This covers output-current steps, voltage limits, protection settings, earth-fault thresholds, temperature limits and communication protocol. Generic values must not replace manufacturer-approved settings.
Confirm start-up authorization, that personnel are clear and the series circuit is ready, that doors and panels are closed and the emergency stop is reset. Energize the incoming supply, check the display and self-diagnostics, start using the approved control method at the minimum or approved initial intensity, and verify output current and voltage (SOP-258).
Confirm authorization, reduce output to the approved minimum state where applicable, stop the CCR using normal control, and verify output current falls and the series circuit is de-energized. Isolate the incoming supply if required, record the shutdown, and apply LOTO if maintenance is planned (SOP-259).
No. Brightness-step values come from the approved CCR configuration, not generic values (SOP-262). After selecting a step, verify actual output current, the lighting response and the local or remote display indication, and record any abnormality.
The work permit is cleared, personnel are clear, tools removed, FOD inspection completed, circuit identification confirmed, LOTO removed only by authorized persons, transformers and connectors secured and circuit integrity verified. The series loop must be confirmed complete with no open circuit, and ATC/Operations coordination completed where required (SOP-275).
Knowing the operating procedure is essential. Understanding how CCRs regulate current and how series circuits behave under fault conditions takes deeper technical knowledge.
Learn through structured training covering:
Develop the technical foundation to work with AGL systems systematically, safely and confidently.
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