12IT826(H) MICHIGAN DEPARTMENT OF TRANSPORTATION
12IT826(H)
MICHIGAN
DEPARTMENT OF TRANSPORTATION
SPECIAL PROVISION
FOR
UNINTERRUPTIBLE POWER SUPPLY FOR INTELLIGENT TRANSPORTATION
SYSTEMS
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a. Description. This work consists of one or more of the following:
1. Furnish and install a rack-mounted, uninterruptible power supply (UPS) in an
Intelligent Transportation Systems (ITS) cabinet or indoor location and connection to the
power supply and equipment within the ITS cabinet or rack;
2. Remove and salvage a UPS and all required mounting hardware, power supply,
cables, patch cords, and jumpers;
3. Install a salvaged UPS and all required mounting hardware, power supply, cables,
patch cords, and jumpers.
b. Materials.
1. Uninterruptible Power Supply.
A. Provide a UPS that meets the following environmental requirements:
(1) Operating temperature range of -29 degrees F to 165 degrees F for ITS
cabinets and Environmental Sensor Stations (ESS);
(2) Operating temperature range of 32 degrees F to 104 degrees F for indoor
racks;
(3) Non-condensing operating humidity range of 5 percent to 90 percent.
B. Provide a rack-mounted, line-interactive UPS with an input voltage of 120 volts
alternating current (VAC) and an output voltage of 120 VAC.
C. Provide a UPS with minimum output power capacity of 1500 volt-ampere (VA).
D. Provide a UPS with an auto-bypass feature and a serial interface port for local
management.
E. Provide a UPS with at least eight protected outlets.
F. Provide a UPS with automatic low-battery and high temperature shutdown
features. Ensure the UPS will return to normal operations without a manual reset.
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G. Provide a UPS capable of remote management over an Ethernet/Internet
Protocol (IP) network via Simple Network Management Protocol (SNMP). The UPS will
be configurable to report failure of line power, high temperature, failures of the battery
system, and overloads.
2. Batteries.
A. Provide batteries capable of discharging and charging over the following
temperature ranges:
(1) -29 degrees F to 165 degrees F for ITS cabinets and ESS. The charging
temperature range will be at least 0 degrees F to +140 degrees F, using a charger
with temperature compensation.
(2) 32 degrees F to 104 degrees F for indoor racks. The charging temperature
range will be at least that of the battery operating temperature.
B. Include connectors and cables recommended by the battery manufacturer and
compliant with the NEC. The batteries must be capable of being serviced and replaced
separately from the main UPS.
(1) Size batteries to be capable of running the full anticipated load for 15 minutes
for ITS cabinets and indoor racks.
(2) Size batteries to be capable of running the full anticipated load for 4 hours for
ESS sites.
3. Battery Heater.
A. Provide a heater and thermostat at each ESS location. Place the heater inside of
the ITS cabinet.
B. Provide a heater that does not consume more than 100 watts (W).
C. Provide only silicone rubber type heaters to provide controlled heat to the UPS
batteries.
D. Include a thermostat to automatically adjust the heater temperature to avoid
overheating of the equipment.
E. The heater is included in the Uninterruptible Power Supply, Environmental
Sensor Stations pay item and will not be paid for separately.
c. Construction.
1. Mount the UPS in the cabinet.
2. Connect the UPS to the UPS breaker inside the ITS cabinet.
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3. Provision UPS with IP address and network settings provided by the Engineer.
Configure the UPS using settings that were approved at equipment mock up (if required per
the Special Provision for System Integration and Testing) or as approved by the Engineer.
4. Alarms.
A. Disable all audible alarms associated with the UPS.
B. Ensure that the communication module of the UPS reports alarm conditions to
the traffic management center/transportation operations center (TMC/TOC) using SNMP
over the ethernet communication system.
5. For the main UPS, provide a manufacturer’s warranty for parts and labor for a period
of 3 years after the date of final acceptance. For the batteries, provide a manufacturer’s
warranty for parts and labor for a period of 2 years after the date of final acceptance.
6. Remove and Salvage. If UPS remove and salvage is specified in the contract, the
following procedures apply:
A. Do not damage the ITS cabinet or associated equipment;
B. Remove the UPS, mounting hardware, power supply, and power cabling
associated with the UPS. Disconnect all communication cables from the UPS and leave
them in place unless otherwise directed by the Engineer;
C. Inform the TMC/TOC and the Engineer a minimum of 7 days in advance of the
decommissioning of the UPS hardware;
D. Salvage the UPS, including mounting hardware, power supply, surge protectors
(if any) and cabling, as directed by the Engineer. The salvaged equipment is to be
stored at a location free of moisture, and rodent/insect intrusion. If the UPS is to be
reinstalled it must be stored until then, otherwise notify the Engineer once the equipment
has been salvaged for pickup to be arranged.
7. Install Salvaged. If a salvaged UPS is to be installed at a location specified in the
contract, follow the procedures detailed in sections c.1 through c.4 of this special provision
and the UPS test requirements in the Special Provision for System Integration and Testing.
d. Measurement and Payment. The completed work, as described, will be measured and
paid for at the contract unit price using the following pay items:
Pay Item
Pay Unit
Uninterruptible Power Supply, ITS Cabinet ................................................................Each
Uninterruptible Power Supply, Indoor ........................................................................Each
Uninterruptible Power Supply, Environmental Sensor Stations ..................................Each
Uninterruptible Power Supply, Rem and Salv ............................................................Each
Uninterruptible Power Supply, Install Salv .................................................................Each
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