Download sample specification- apss

SAMPLE SPECIFICATION – ADVANCED POWER SUPPLY SYSTEM
Note: Modify the items in italics according to your specific job requirements.
ITEM L-150 INSTALLATION OF THE ADVANCED POWER SUPPLY SYSTEM
DESCRIPTION
150-1.1 This item shall consist of furnishing and installing the Advanced Power Supply
System components in accordance with these specifications.
This item shall also include all circuit breakers, wire and cable connections, the
furnishing and installing of all necessary conduits and fittings and all necessary mounting
structures. It shall also include the testing of the installation and all incidentals necessary
to place all Advanced Power Supply System components in operation as completed units
to the satisfaction of the Engineer.
EQUIPMENT AND MATERIALS
150-2.1 APS System. The Advanced Power Supply System (APSS) architecture shall
minimize electrical power requirements, system complexity and maintenance
requirements for LED based airfield lighting equipment. The APSS architecture shall be
based on a regulated DC Alternating Pulse Width Modulated (PWM) power supply
connected to airfield LED fixtures on a series circuit. It shall be possible to retrofit APSS
components on existing 6.6A or 20A airfield series circuits, including substituting
equivalent APSS components for the existing Constant Current Regulators, existing
airfield lighting fixtures and existing L-830/L-831 isolation transformers.
All APSS components shall be as manufactured by ADB Airfield Solutions (www.adbairfield.com) or approved equal.
150-2.2 EQUIPMENT SUPPLIED. A quantity of {TBD} Advanced Power Supplies,
{TBD L-852T fixtures}, {TBD L-852C fixtures}, {TBD L-852D fixtures}, {TBD L-861T
fixtures}, {TBD L-861 fixtures}, {TBD L-861E fixtures}, {TBD L-810 fixtures}, {TBD L858 signs}, {TBD ICAO Taxiway Centerline}, {TBD Bypass Devices- one for each
elevated fixture} shall be supplied in the quantities specified in the plans. Each APS
system shall include one Instruction Manual. The manufacturer shall also have a
downloadable electronic version of the manual available on their web site.
150-2.3 Power Supply. The Advanced Power Supply (APS) shall be based on a DC
Alternating Pulse Width Modulation (PWM) concept and shall be 1KW {2KW}, have a
maximum output of 2.0A, be 3-step {5-step}, with an input voltage of 220-240Vac,
50/60Hz. The maximum output of the 1KW APS shall be 500Vac. {The maximum
output of the 2KW APS shall be 1000Vac.} The APS shall supply three {five} precision
output pulse widths to power the airfield lighting circuit. If input power loss occurs,
operation shall resume within five seconds after restoration of input power. The remote
control voltage shall be 120Vac {48VDC}. The remote control methodology shall be the
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SAMPLE SPECIFICATION – ADVANCED POWER SUPPLY SYSTEM
same as FAA CCRs, i.e., CCI, CC, B1, B2, B3, B4, B5 for 5-step and CCI, CC, B10,
B30, B100 for 3-step.
The APS shall use an air-cooled design. Constant current regulation shall be obtained by
modulating the ON time of the alternating DC current output in order to dim the fixture’s
light output. The ON time modulation shall be chosen such that each LED fixture’s light
output complies with FAA LED Engineering Brief 67 (current edition). The modulation
frequency of the fixture LED shall be 120Hz at step B1 and B2 (for a step system) and
360Hz for all steps of a 3-step system and the top three steps of a 5-step system. The
APS shall use feedback circuitry to monitor the output. The APS input power factor shall
be 0.90 minimum and the efficiency shall be 90% minimum when connected to a full
resistive load.
The APS shall use a standard 19” (48.3 cm) rack mount enclosure with a maximum
height of 9.06” (23.0 cm). The APS shall include overcurrent and open-circuit
protection. To improve safety, no nominal voltage in excess of 500V (for the 1KW unit)
or 1000V (for the 2KW unit) shall be present anywhere inside the APS or at the APS
output terminals. Lightning protection on both the input and output of the APS shall be
provided.
The APS shall be equipped with a front-mounted LCD display indicating the selected
output current step; if the APS is switched off; or if the APS is in Remote Control. The
LCD display shall also indicate the APS output voltage. The APS shall also be equipped
with a front-mounted input-power circuit breaker
150-2.4 APSS Airfield Equipment. The LED fixtures used on the APSS shall comply
with applicable photometric and mechanical requirements contained in FAA Advisory
Circular 150/5345-46 (current edition) {ICAO Annex 14}. Each fixture shall contain
internal circuitry to insure that the polarity of the fixture’s input current is correct
regardless of the orientation of the input series circuit wire. Each fixture shall also
contain an input ratio transformer that insures the correct LED current is present for the
LED(s) present in the various types of fixtures. Elevated APSS fixtures shall utilize a
waterproof Bypass Device that connects between the series circuit and the fixture. The
Bypass Device shall be designed to insure circuit continuity in case any elevated fixture
is broken over at the fixture’s frangible coupling. The Bypass Device shall use standard
FAA L-823 connectors for both the primary and secondary connections.
150-2.5 APSS Fixture Types. The types of LED fixtures that shall be available include:
{L-852T}, {L-852C}, {L-852D}, {L-861}, {L-861E}, {L-861T}, {L-810}, {L-858}, {ICAO
Taxiway Centerline}.
{To insure a constant light output, L-858 signs shall be connected to a dedicated APS
supply/series circuit.}
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SAMPLE SPECIFICATION – ADVANCED POWER SUPPLY SYSTEM
CONSTRUCTION METHODS
150-3.1 PLACING THE APSS. The contractor shall furnish and install each Advanced
Power Supply and the LED fixture equipment as specified in the proposal and shown in
the plans. The Advanced Power Supply shall be mounted in the vault at the location
shown on the plans.
150-3.2 TESTS. An open-circuit test, conducted according to the manufacturer's
instructions, shall be performed. The APS shall then be fully tested by continuous
operation for not less than 24 hours prior to acceptance. The test shall include operating
the APS in each step (Local and Remote) not less than 10 times at the beginning and end
of the 24-hour test.
METHOD OF MEASUREMENT
150-4.1 MEASUREMENT. The quantity of equipment to be paid for under this item
shall be for {TBD} APS Power Supplies, {TBD L-852T fixtures}, {TBD L-852C fixtures},
{TBD L-852D fixtures}, {TBD L-861T fixtures}, {TBD L-861 fixtures}, {TBD L-861E
fixtures}, {TBD L-810 fixtures}, {TBD L-858 signs}, {TBD Bypass Devices}, and one
Instruction Manual (per system) installed and accepted as a completed unit, in place,
ready for operation.
BASIS FOR PAYMENT
150-5.1 PAYMENT. Payment will be made at the contract unit price for the completed
total quantity of APSS equipment installed, in place by the Contractor, and accepted by
the Engineer. This price shall be full compensation for furnishing all materials and for all
preparation, assembly, and installation of these materials, and for all labor, equipment,
tools, and incidentals necessary to complete this item.
Payment will be made under:
Item L-150-5.1
APSS, in Place—per each
END OF ITEM L-150
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