SECTION 16611

STATIC UNINTERRUPTIBLE POWER SUPPLY

PART 1 GENERAL

WORK INCLUDED

Static uninterruptible power supply (UPS).

RELATED WORK

Section [_____ - _____:] Standby power generation systems.

REFERENCES

ANSI/IEEE 446 - Recommended Practice for Emergency and Standby Power Systems for Industrial and Commercial Applications.

ANSI/IEEE 493 - Recommended Practice for Design of Reliable Industrial and Commercial Power Systems.

ANSI/IEEE 519 - Guide for Harmonic Control and Reactive Compensation of Static Power Converters.

ANSI/NEMA 250 - Enclosures for Electrical Equipment (1000 Volts Maximum)

SYSTEM DESCRIPTION

System Configuration: Non-redundant type with reverse transfer. [Designed for capacity expansion by addition of parallel modules in field with minimum downtime.] [_________________________________________________.]

Components: System includes battery to provide continuous source of electrical power; rectifier/charger to maintain battery charge and to provide input to inverter when utility power is available; inverter to provide power to load during normal operation; static switch to transfer load automatically and without disturbance between inverter and utility power; manual switch to bypass static switch for maintenance; input and output isolation transformers and filters to provide appropriate isolation and distrubance attenuation; and necessary monitors, sensors, and control circuits.

Design Standards: In accordance with ANSI/IEEE 446, ANSI/IEEE 493, and ANSI/IEEE 519.

Utility Power Available: Rectifier/charger supplies load through inverter and maintains battery in fully-charged "float" condition.

Utility Power Failure: Load supplied from battery through static inverter if utility power drops below preset limits, or fails. There is no output disturbance transmitted to load.

Utility Power Returns: Rectifier/charger supplies power to load through inverter while it recharges battery. There is no output disturbance transmitted to load.

Rectifier/Charger or Battery Failure: Static switch transfers load to synchronized utility power, without disturbance, when inverter output deviates beyond specified quality limits. When inverter output returns to acceptable operation, it is synchronized to utility power, and after preset timing interval, static switch returns load to inverter without disturbance.

Overload or Short Circuit: Static switch transfers load to utility power during load inrush and clearing of faulted branch circuits; load automatically transfers back to inverter without disturbance.

Inverter Failure: Static switch transfers to utility power without disturbance, and remains until manually returned.

Maintenance Operation: Manual load transfer to utility power using bypass switch. During bypass mode, operation of system or static switch does not affect power to load.

Seismic Design Criteria: [_____________________.]

QUALITY ASSURANCE

Manufacturer: Company specializing in UPS equipment with [three] [_____] years [documented] experience.

Operate system for [24] [_____] hours [at full load] before shipping.

SUBMITTALS

Submit shop drawings and product data under provisions of Section [01300.] [01340.]

Provide battery rack dimensions; battery type, size, dimensions, and weight; detailed equipment outlines, weight, and dimensions; location of conduit entry and exit; single-line diagram indicating metering, control, and external wiring requirements; heat rejection and air flow requirements.

Submit product data for major components, such as batteries. Include catalog sheets and technical data sheets to indicate physical data and electrical performance.

Submit manufacturer's installation instructions under provisions of Section [01300.] [01340.]

Include equipment installation outline, connection diagram for external cabling, internal wiring diagram, and written instruction for installation.

Submit manufacturer's certificate under provisions of Section [01400] [01405] that system meets or exceeds specified requirements.

OPERATION AND MAINTENANCE DATA

Submit data under provisions of Section [01700.] [01730.]

Include description of operation and servicing procedures; list of major components; recommended remedial and preventive maintenance procedures; spare parts list.

DELIVERY, STORAGE, AND HANDLING

Deliver products to site under provisions of Section [01600.] [01610.]

Store and protect products under provisions of Section [01600.] [01620.]

Protect equipment from extreme temperature and humidity by storing in a conditioned space.

Protect equipment from dust and debris by wrapping unit in dusttight cover and storing away from construction activity.

ENVIRONMENTAL REQUIREMENTS

Do not store or install unless temperature is maintained between [32] [_____] degrees F ([0] [_____] degrees C) and [104] [_____] degrees F ([40] [_____] degrees C), at a relative humidity less than [95] [_____] percent (non-condensing).

WARRANTY

Battery: Provide [20] [_____] year warranty under provisions of Section [01700,] [01740,] pro-rated after first year on straight line basis.

Warranty: Include coverage of travel, labor, parts, and service.

MAINTENANCE SERVICE

Furnish service and maintenance of uninterruptible power supply for [one] [_____] year from Date of Substantial Completion.

Include coverage of travel, labor, parts, and service.

SPARE PARTS

Provide spare parts under provisions of Section [01700.] [01750.]

Provide [________________________________.]

PART 2 PRODUCTS

ACCEPTABLE MANUFACTURERS

[______________________________________.]

[______________________________________.]

[______________________________________.]

Substitutions: Under provisions of Section [01600.] [01630.]

SYSTEM RATINGS AND OPERATING CHARACTERISTICS

System Continuous Rating: [As shown on the Drawings,] [As scheduled,] [[_____] KVA, [_____] KW,] over entire battery voltage range at specified power factor. Maintain output voltage within specified limits at any load from full load to no-load.

Battery Capacity: [Capable of operating at full load for [_____] hours.] [As shown on the Drawings.] [As scheduled.]

Voltage Rating: [120/208] [277/480] [_____] volts, [one] [3] phase input; [120/208] [277/480] [_____] volts, [one] [3] phase output.

Input Voltage Limits: [+/- 10] [_____] percent.

Input Frequency: [60 +/- 3] [_____] Hz.

Input Current Limit: Adjustable to maximum of [125] [_____] percent of that required to operate at full load with battery bank on float charge.

Current Walk-In: [25 to 100 percent in 15 seconds.] [________________________.]

UPS Power Factor Over Full Range of Loads and Input Voltages: [74 to 100 percent, lagging.] [[_____] percent[,][.] [lagging.]]

Harmonic Distortion of Input Current Wave Form: [5] [_____] percent maximum at full load.

Output Voltage Regulation:

[+/- 1] [_____] percent for balanced load, full range of DC input and no load to full load variations.

[+/- 3] [_____] percent for 50 percent unbalanced load, full range of DC input and no load to full load variations.

[+/- 5] [_____] percent during maximum overload of the system.

Output Voltage Adjustment: [+/- 5] [_____] percent.

Output Free Running Frequency: [60] [_____] Hz +/- [0.5] [_____] percent.

Frequency Adjustment: [+/- 2] [_____] Hz.

Output Harmonic Distortion: Maximum [5] [_____] percent rms total harmonic distortion (THD) and maximum [3] [_____] percent any single harmonic, at rated frequency and voltage, from 10 percent load to full load and over battery voltage range, measured into a linear load.

Voltage Transient Response for Application of 0 to 50 Percent, 50 to 100 Percent, 100 to 50 Percent, and 50 to 0 Percent Step Loads, and Transfer To and From Bypass Line:

[+8, -10 percent for a maximum of 8.3 milliseconds.]

[+/- 5 percent for a maximum of 25 milliseconds.]

[+/- 3 percent for a maximum of 50 milliseconds.]

[[_____] percent for a maximum of [_____] milliseconds.]

Recovery to steady state within [100] [_____] milliseconds after any out-of-tolerance variation.

Phase Displacement:

[120 +/- 1 degrees for balanced loads.]

[120 +/- 4 degrees for 50 percent unbalanced loads.]

[_____] +/- [_____] degrees for [_____________.]

Three-phase Overload Ratings:

[1000 percent for 5 cycles; via static switch.]

[150 percent for 10 seconds.]

[125 percent for 10 minutes.]

[[_____] percent for [_____] minutes.]

Output Current Limit: [150] [_____] percent of rated output current.

Voltage Unbalance: [3] [_____] percent maximum line-line with 100 percent load unbalance.

Efficiency: [_____] percent at full load, [_____] percent at [_____] percent load, minimum. Measure efficiency of unit including battery and isolation transformer losses.

DESIGN AND CONSTRUCTION

Inverter Type: [Pulse-width modulated.] [Ferroresonant transformer.] [_________________________.]

Rectifier/Charger Capacity: Sufficient to supply full load to inverter while recharging fully-discharged battery to 95 percent of full capacity in four hours or less; and within the input current limits specified.

Provide means for on-line [load] testing of UPS, including test points to allow easy adjustment and servicing. Provide means for testing static switch while load is bypassed to utility.

Mean Time Between Failures: 60,000 hours, minimum.

Cooling: [Forced convection][.] [or] [natural convection.] [Provide forced air cooled unit with redundant cooling so that failure of any one cabinet cooling fan or fan circuit will not affect continued operation at full load and ambient temperature of 77 degrees F (25 degrees C) or lower.]

Operate battery floating, isolated from the UPS AC input and AC output. The battery may be resistance grounded through 5,000 - 10,000 ohms for the purpose of ground fault sensing.

Component Ratings: Adequate for expected service life of twenty years continuous duty, ten years without component replacement.

Do not use continuous moving parts or electron tubes. Accomplish power switching using semiconductor devices.

Construct equipment so each power component can be replaced without a soldering iron or special tools.

Use front-panel removable plug-in control modules.

FABRICATION

Electroplate brackets and securing hardware with corrosion resistant material. Secure bolts, studs and nuts with lockwashers.

Identify internal wiring at each end of conductor.

Provide cabinet grounding lug.

Conversion Equipment Enclosure: ANSI/NEMA 250, Type 1 enclosure allowing access from front for servicing adjustments and connections. Access through hinged door equipped with tumbler lock and latch handle. Equip cabinet for fork truck lifting.

Equip air inlet with permanent type filters and pressurize cabinet, or use gaskets around door and panel openings to prevent entry of dirt.

Cabinet Finish: Primed and painted inside and outside with suitable semi-gloss enamel.

BATTERY

Storage Battery: [Sixty] [_____] cell, [lead calcium] [__________] heavy duty industrial battery, designed for auxiliary power service. Provide battery with impact resistant plastic case. Provide cells with explosion proof vents, clear containers, and ample space for plate growth without stressing container and cover.

Electrolyte Specific Gravity: No greater than 1.250 when fully charged and measured at 77 degrees F (25 degrees C).

Ampere Hour Rating: Sufficient to supply direct current to inverter for outage period specified, with inverter operating at full rated output, to a discharge limit of not less than 1.65 volts per cell.

Battery Racks: Maximum of three-tier, all [steel] [_____] construction, with plastic insulating rails at all points of contact with the battery case. Paint racks with acid resistant paint.

CONTROLS AND INDICATORS

Controls: AC input circuit breaker; INVERTER OPERATE switch to initiate inverter operation; INVERTER STANDBY switch to cause inverter to cease operation; STATIC SWITCH TRANSFER switch to permit manual actuation of static transfer switch; STATIC SWITCH LOCK-OUT switch to inhibit automatic retransfer of load to inverter; battery charge timer; INDICATOR TEST switch; static switch preferred input circuit breaker; static switch output circuit breaker; static switch bypass circuit breaker; [____________________;] and controls for maintenance bypass switch.

Indicators: Inverter synchronized to utility; load connected to utility; static transfer switch inhibited; high/low DC voltage; overtemperature; [________________;] and inverter output overload.

Meters: Use [one] [_____] percent accuracy meters to indicate rectifier/charger DC voltage and current; utility, inverter output, and load AC voltage (each phase-to-neutral and phase-to-phase); load AC current (each phase, neutral and ground); inverter output and utility frequency; [__________________;] and UPS output WATTS.

Wall-mounted Alarm Panel: Include monitoring and alarm functions for utility power available; utility bypass power available; inverter output available; inverter synchronized to utility; load connected to inverter output; load connected to utility bypass power (alarm); static transfer switch inhibited (alarm); high/low DC voltage (alarm); overtemperature (alarm); inverter output overload (alarm); [____________________;] audible alarm sounds when any of the above alarm conditions occur; and alarm/indicator silence/test switch.

PART 3 EXECUTION

INSTALLATION

Install UPS as shown on the Drawings, and in accordance with manufacturer's instructions.

FIELD QUALITY CONTROL

Perform field inspection and testing under provisions of Section [01400.] [01410.]

Field Tests: Verify specification performance criteria; measure battery discharge and recharge times; simulate fault in each system component and utility power; operate unit at 77 degrees F (25 degrees C) for eight hours[;] [at rated load [using resistive bank;]] [_________________;] and other tests as recommended by manufacturer.

MANUFACTURER'S FIELD SERVICES

Provide manufacturer's field services under provisions of Section [01400.] [01405.]

Include services of technician to supervise adjustments, final connections, and system testing.

PROTECTION

Protect finished installation under provisions of Section [01500.] [01535.]

SCHEDULE

END OF SECTION