COSAL Power is an ICAO-compliant power supply and management system for airfield lighting. The modular system includes the Constant Current Regulator (CCRE), transformer modules, transformer and regulator cubicles, and are suited for civil and military airports of any size and category.
CCRE - Constant Current Regulator
The COSAL Power is used for supplying, controlling and monitoring series circuits. The CCRE, a component of the COSAL system, has been developed specifically for use in airport lighting systems, and serves to ensure dependable supply to series circuits featuring lights or taxi traffic signage.
The CCRE is designed as a 19” drawer, featuring at the front a back-lit 4-line LC display, plus a membrane keyboard for parameterization and manual operator control.
A cubicle system (which can also be provided in different installation heights) serves to accommodate a maximum of 8 regulator drawers with a possible 16 control circuits. Both the power and control connections are created by plugging in the plug connectors provided at the rear.
The Control System for Airfield Lighting – COSAL is used for supplying, controlling and monitoring series circuits. The regulator cubicle serves for accommodating the 19” drawer units of the COSAL system.
The top section of the regulator cubicle has space for up to 8 drawer levels, which can be fitted with different functions in any desired sequence.
The following functions are provided:
• Constant current regulator (CCRE) and its different variants
• Insulation resistance measuring system (IME)
• Lamp failure measuring system (CAS)
• Switching drawer CU 5
The transformer cubicle, part of the COSAL system, serves to accommodate the transformer modules for supplying the series circuits.
The transformer cubicle can accommodate up to 5 transformer modules. Besides the 9 transformer sizes standardized in IEC 61822, customized transformer modules from 0.6 to 35 kVA are also available.
Up to a rating of 10 kVA, the module frames slide on angular steel profiles, and are arrested by means of screws. For higher ratings, the transformer modules are permanently installed. A plexiglass pane in front of each module serves as shock-hazard protection. At the sides, the individual cubicles are partitioned by perforated sheeting. Cable entry is from below as standard. To facilitate heat dissipation, the roof cover has been raised.
The COSAL Power transformer modules supply the series circuits.
Each module comprises the following units:
• Power supply transformer
• Current transformer for actual-value acquisition
• Surge arrester
• Connection module for insulation value monitoring (optional)
CAS - Lamp Failure Measuring Unit
CAS, a constituent part of the COSAL system, is a scalable measuring system for acquiring, displaying, and forwarding lamp failure figures and current actual values in phase-controlled series circuits of the airport lighting system.
CAS is installed in a 19” drawer, which at the front features a back-lit 4-line LCD display and a membrane keyboard for parameterization and manual operation. At the rear are the plug-in contacts for the power supply, for communication and for connecting the current and voltage measuring transducers of the series circuits. The measuring system can be fitted with any number of measuring modules up to 8, with up to eight circuits connected to each measuring module.
The measured values acquired are made available to the higher-order instrumentation and control system via a field bus. The field buses currently available solely for redundant and non-redundant communication are CAN-BUS and PROFIBUS-DP, while for the non-redundant category the serial protocols RCOM and MODBUS are additionally possible via the system’s own RS485 interface.
The data thus conditioned are shown on the display with a cycle time of approx. 320 ms, together with the name of the circuit concerned, and forwarded to the instrumentation and control system. There is also provision for manual selection of individual circuits for display.
IME - Insulation Resistance Measuring System
The IME, a constituent part of the COSAL system, is a measuring system for acquiring, displaying and forwarding insulation measured values in phase-controlled series circuits of airport lighting systems.
The measuring system consists of a 19” drawer, which at the front incorporates a backlit, 4-line LC display plus a membrane keyboard for parameterization and manual operator control. At the rear are the plug-in contacts for the power supply, communication and for controlling the high-voltage relay provided for each series circuit. The measuring system is able to cyclically monitor up to 64 circuits in succession. The measured values acquired are made available for the higher-order instrumentation and control system via a field bus.
The field buses currently available for redundant and non-redundant communication are CAN-BUS and PROFIBUS-DP, while for the non-redundant category the serial protocols RCOM and MODBUS are additionally possible via the system’s own RS485 interface.
When using regulators from the COSAL family (CCREs), the insulation value measured can also be shown directly in the display of the regulator concerned. The measuring voltage is also automatically disconnected from the circuit when the regulator is switched off.