static uninterruptible power supply 26 33 53

SECTION 26 33 53 – STATIC UNINTERRUPTIBLE POWER SUPPLY

PART 1 – GENERAL

1.1

A.

SUMMARY

This specification defines the electrical and mechanical characteristics and requirements for a continuous-duty three-phase, solid-state, scalable (field-upgradable) uninterruptible power system (UPS). The UPS shall provide high-quality AC power for sensitive electronic equipment.

1.2

A.

STANDARDS

The UPS shall be designed in accordance with the applicable sections of the current revision of the following documents. Where a conflict arises between these documents and statements made herein, the statements in this specification shall govern.

1.

2.

3.

UL Standard 1778

CSA 22.2, No. 107.1

FCC Part 15, Class A

B.

5. National Electrical Code (NFPA-70)

7. ISTA_1H

The UPS shall be UL and cUL listed per UL Standard 1778.

1.3

SYSTEM DESCRIPTION

A. UPS shall be manufactured by Liebert or APC, equivalent to Liebert NX UPS System, which is basis of design, and consisting of the following modules and features.

1. NX UPS Module model 38SA100A0A00.

2. External Battery Cabinet model 38BP120XPX1BNS, rated for 8 minutes at full load.

3. Matching Bypass / Distribution Cabinet (BDC) model FFA12C6NNG6, equipped with external 3 breaker maintenance bypass with SKRU circuit, an output isolation transformer and two (2) output load breakers to feed remote distribution panelboards.

B. UPS System rating shall be 100kVA initial rating with scalable upgrade capabilities to a future

120kVA rating without additional hardware or equipment (Soft-Scale Technology).

C. System Voltage Configurations

1. UPS System input: 480VAC, 3 Phase, 3 Wire plus ground (single input)

2. UPS System output: 208/120V, 3 Phase, 4 Wire plus ground

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1.4

A.

DESIGN REQUIREMENTS - UPS MODULE

Voltage. Input/output voltage specifications of the UPS shall be:

1.

2.

Rectifier/Bypass Input: 480 volts, three-phase, 3-wire-plus-ground

Output: 480 volts, three-phase, 3-wire-plus-ground

B. Output Load Capacity. Specified output load capacity of the UPS shall be 100 kVA at 0.9 lagging power factor (initial rating).

C. Scalable Output Capacity. UPS rated output capacity will be scalable by means of a software update which will require no hardware modifications to the UPS. Models will be available in capacity from the 100kVA to the 120kVA system rating.

D. Parallel Operation (if needed in future). Up to four (4) UPS module outputs may be connected together in parallel to provide up to 3X maximum output capacity with redundancy.

1. Current Sharing: When multiple UPS modules are connected in parallel and powering a common load, each UPS module output current will not differ by more than 5% of the rated full load current of one UPS module.

1.5

A.

DESIGN REQUIREMENTS - BATTERY

Battery Cells: Valve-regulated, lead acid batteries.

B. Reserve Time: 8 minutes at full 100kVA, 0.9 power factor, with ambient temperature of 77°F

(25°C); 6 minutes at the future upgraded full 120kVA, 0.9 power factor rating. Unit shall provide terminal for connection of external batteries.

C. Recharge Time: to 95% capacity within ten (10) times discharge time.

1.6

MODES OF OPERATION

A. The UPS shall be designed to operate as an on-line, double-conversion, reverse-transfer system with the following operating modes:

1.

2.

3.

4.

Normal - The critical AC load is continuously supplied by the UPS inverter. The rectifier/charger derives power from an AC source and supplies DC power to the inverter while simultaneously float-charging the reserve battery.

Emergency - Upon failure of utility AC power, the critical AC load is supplied by the inverter, which obtains power from the battery. There shall be no interruption in power to the critical load upon failure or restoration of the utility AC source.

Recharge - Upon restoration of utility AC power after a utility AC power outage, the rectifier/charger shall automatically restart and assume the inverter and battery recharge loads.

Bypass - If the UPS must be taken out of service for maintenance or repair or if the inverter overload capacity is exceeded, the static transfer switch shall perform a reverse transfer of the load from the inverter to the bypass source with no interruption in power to the critical AC load.

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5. Eco-Mode - When this mode is enabled by service personnel the UPS will power the critical load through the UPS static bypass. If the bypass source becomes unqualified the UPS will switch to Normal mode of operation as defined above. Utility power is considered unqualified when either the input voltage varies more than +10% of rated voltage or the input frequency varies beyond +10% of 60Hz. Ten (10) minutes after the bypass source becomes qualified the UPS will automatically transfer to Eco-Mode of operation.

1.7

A.

PERFORMANCE REQUIREMENTS

AC Input to UPS

1.

2.

3.

Voltage Configuration for Standard Units: 480V, three-phase, three-wire plus ground

Voltage Range: +15%, -20% of nominal without de-rating

Frequency: 57-66 Hz a. b.

>0.99 at nominal input voltage and full-rated UPS output load

>0.98 at nominal input voltage and half-rated UPS output load

5.

6.

7.

8.

Inrush Current: UPS inrush current not to exceed 1.5 times rated input current.

Maintenance bypass and distribution cabinet inrush current not to exceed 8 times rated input current.

Current Limit: 140% of nominal AC input current maximum

Current Distortion: <3% reflected THD maximum at full load

Surge Protection: Sustains input surges without damage per criteria listed in IEC 1000-4-

5

1.8

A.

AC OUTPUT, UPS INVERTER

Voltage Configuration: three-phase, 3-wire plus ground

1.

2.

±1% three-phase RMS average for a balanced three-phase load for the combined variation effects of input voltage, connected load, battery voltage, ambient temperature and load power factor

±2% three-phase RMS average for a 100% unbalanced load for the combined variation effects of input voltage, connected load, battery voltage, ambient temperature and load power factor

C. Frequency: Nominal frequency ±0.05% for single unit and ±0.25% for paralleled units

D. Frequency Slew Rate: Selectable from 0.1Hz/sec to 3.0Hz/sec maximum for single unit, fixed maximum of 0.2Hz/sec for paralleled units

1. ±0.5 degree for balanced load

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 3

F.

2. ±1.0 degrees for 100% unbalanced load

Bypass Line Sync Range:

1. ±2.0 Hz, field-selectable ±0.5 to 5.0 Hz

1.

2.

1% total harmonic distortion (THD) for linear loads

<5% THD for 100% nonlinear loads (3:1 crest factor) without kVA/kW derating

H. Load Power Factor Range: 0.7 lagging to 1.0 leading without derating

I. Output Power Rating: Rated kVA at 0.9 lagging power factor

1.

2.

3.

110% for 1 hour

125% for 10 minutes

150% for 1 minute

K. Voltage Transient Response:

1.

2.

100% load step: ±5.0%

Loss or return of AC input power: ±1.0%

Transient Recovery Time: to within 2% of output voltage within one cycle L.

M. Voltage Unbalance: 100% unbalanced load, ±2%

1.9

A.

ENVIRONMENTAL CONDITIONS

The UPS shall be able to withstand the following environmental conditions without damage or degradation of operating characteristics:

1. Operating Ambient Temperature

2. a. b.

UPS Module: 32°F to 104°F (0°C to 40°C)

Battery: 77°F ±9°F (25°C ±5°C)

Storage/Transport Ambient Temperature a. b.

UPS Module: -13°F to 158°F (-25°C to 70°C)

Battery: -4°F to 92°F (-20°C to 33°C) a. 0 to 95%, non-condensing

4. Altitude a. Operating: to 6,562 ft. (2000m) above mean sea level without de-rating. Linearly de-rated from 100% load at 6,562 ft. (2000m) to 88% load at 9,843 ft. (3000m).

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b. Storage/Transport: to 40,000 ft. (12,200m) above mean sea level. a. Less than 63dB for 100-120kVA model

1.10

SUBMITTALS WITH BID

1. Provide submittals on compact disc or flash drive type medium. Submittals with the bid shall include: a. b. c. d. e. f.

System configuration with single-line diagrams

Functional relationship of equipment including weights, dimensions and heat dissipation

Descriptions of equipment to be furnished, including deviations from these specifications

Size and weight of shipping units to be handled by installing contractor

Detailed layouts of customer power and control connections

Detailed installation drawings including all terminal locations

2. UPS Delivery Submittals a. Submittals upon UPS delivery shall include a complete set of submittal drawings and two (2) sets of instruction manuals that shall include a functional description of the equipment with block diagrams, safety precautions, instructions, step-by-step operating procedures and routine maintenance guidelines, including illustrations.

3. General a. All submittals shall be project-specific, not factory-generic.

1.11

WARRANTY

1. The UPS manufacturer shall warrant the UPS module against defects in materials and workmanship for 12 months after initial startup and testing.

B. Battery

1. The battery manufacturer’s standard warranty shall be passed through to the end user.

1.12

QUALITY ASSURANCE

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1. A minimum of 20 years’ experience in the design, manufacture and testing of solid-state

UPS systems is required. The system shall be designed and manufactured according to world-class quality standards. The manufacturer shall be ISO 9001:2000 certified.

1. Before shipment, the manufacturer shall fully and completely test the system to assure compliance with the specification.

PART 2 - PRODUCT

2.1

FABRICATION

A. Materials

1. All materials of the UPS shall be new, of current manufacture and high grade and shall not have been in prior service except as required during factory testing. All active electronic devices shall be solid-state. All power semi-conductors shall be sealed.

Control logic and fuses shall be physically isolated from power train components to ensure operator safety and protection from heat. All electronic components shall be accessible from the front without removing sub-assemblies for service access.

B. Wiring

1.

2.

Wiring practices, materials and coding shall be in accordance with the requirements of the National Electrical Code, OSHA and applicable local codes and standards. All bolted connections of busbars, lugs and cables shall be in accordance with requirements of the

National Electrical Code and other applicable standards. All electrical power connections shall be torqued to the required value and marked with a visual indicator.

Provisions shall be made in the cabinets to permit installation of input, output and external control cabling, using raceway or conduit. Provision shall be made for top and bottom access to input, output, bypass and DC connections. In conformance with NEC, connection cabinets shall provide for adequate wire bend radius. All copper busbars for customer power connections shall be tin plated for connection integrity.

C. Construction and Mounting

1. The UPS shall be in NEMA Type 1 enclosures, designed for floor mounting. The UPS shall be structurally adequate and have provisions for hoisting, jacking and forklift handling. Maximum cabinet height shall be 78.7 in. (2000mm).

D. Cooling

1.

2.

Cooling of the UPS shall be by forced air using a redundant fan configuration. Fan power shall be provided by the UPS.

The thermal design, along with all thermal and ambient sensors, shall be coordinated with the protective devices before excessive component or internal cabinet temperatures are exceeded. Air filters shall be located at the point of air inlet and be changeable.

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2.2

COMPONENTS

A. Rectifier/Charger

1. General a. The term rectifier/charger shall denote the solid-state equipment and controls necessary to convert AC to regulated DC for input to the inverter and for charging the battery.

2.

3.

AC Input Current Limiting a. The rectifier/charger unit shall be provided with AC input current limiting whereby the maximum input current shall be limited to 140% of the full input current rating.

Input current limit will be adjustable by service personnel to allow the UPS to be used with undersized feeder breakers.

DC Filter a. The rectifier/charger shall have an output filter to minimize ripple current into the battery. The AC ripple voltage of the rectifier DC output shall not exceed 1% RMS of the float voltage. The filter shall be adequate to ensure that the DC output of the rectifier/charger will meet the input requirements of the inverter without the battery connected.

4. Automatic Rectifier Restart a. Upon restoration of utility AC power, after a utility AC power outage and prior to a

UPS automatic end-of-discharge shutdown, the rectifier/charger shall automatically restart and assume the inverter and battery recharge loads. a. In addition to supplying power for the inverter load, the rectifier/charger shall be capable of producing battery charging current sufficient to replace 95% of the battery discharge power within ten (10) times the discharge time. After the battery is recharged, the rectifier/charger shall maintain the battery at full charge until the next emergency operation. a. There shall be DC overvoltage protection so that if the DC voltage rises to the preset limit, the UPS will shut down automatically and initiate an uninterrupted load transfer to the static bypass line.

B. Inverter

1. General

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 7

2.

3.

4. a. The term inverter shall denote the equipment and controls to convert DC from the rectifier/charger or battery to precise AC to power the load. The inverter shall be solid-state, capable of providing rated output power, and for increased performance the inverter shall be a pulse-width-modulated design and utilize insulated gate bipolar transistors (IGBTs).

Overload Capability a. The inverter shall be capable of supplying current and voltage for overloads exceeding 100%. The inverter is to provide 150% of full load for 1 minute, 125% of full load for 10 minutes and 110% of full load for 1 hour. A status indicator and audible alarm shall indicate overload operation. The UPS shall transfer the load to bypass when overload capacity is exceeded.

Fault Clearing and Current Limit a. The inverter shall be capable of supplying an overload current of 150% of its fullload rating for one minute. For greater currents or longer time duration, the inverter shall have electronic current-limiting protection to prevent damage to components.

The critical load will be transferred to the static bypass automatically and uninterrupted. The inverter shall be self-protecting against any magnitude of connected output overload. Inverter control logic shall sense and disconnect the inverter from the critical AC load without the requirement to clear protective fuses.

Step Load Response

6.

7. a. b. c.

Total harmonic distortion in the output voltage will not exceed 1% for 0% to 100% linear loads.

Total harmonic distortion in the output voltage will not exceed 4% for 0% to 100% non-linear loads.

Total harmonic distortion in the output voltage will not exceed 5% for 0% to 100% non-linear, unbalanced loads.

Phase Balance a. Electronic controls shall be provided to regulate each phase so that an unbalanced loading will not cause the output voltage to go outside the specified voltage unbalance or phase displacement. With 100% load on one phase (and 0% load on the other two phases) or 100% load on two phases (and 0% load on the other phase), the voltage balance is to be within 2% and the phase displacement is to be

120 degrees within ±1.5 degrees.

Inverter Shutdown a. For rapid removal of the inverter from the critical load, the inverter control electronics shall instantaneously turn off the inverter transistors. Simultaneously, the static transfer switch shall be turned on to maintain continuous power to the critical load.

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 8

9. a. The inverter shall be protected by the following disconnect levels:

1)

2)

3)

DC Overvoltage Shutdown

DC Undervoltage Warning (Low Battery Reserve)—pre-warning time is adjustable

DC Undervoltage Shutdown (End of Discharge)

Output Frequency

C. Display and Controls

1. a. The output frequency of the inverter shall be controlled by a high-speed DSP capable of holding the inverter output frequency to within ±0.05% during steady state and transient conditions. Total deviation from the rated frequency, including short time fluctuations and drift, shall not exceed 0.05%.

Monitoring and Control a. The UPS shall be provided with a microprocessor-based unit status display and controls section designed for convenient and reliable user operation. A graphical liquid crystal display (LCD) shall be used to show a single-line diagram of the UPS and shall be provided as part of the monitoring and controls sections of the UPS.

All operator controls and monitors shall be located on the front of the UPS cabinet.

Monitoring functions such as metering, status and alarms shall be displayed on the graphical LCD. Additional features of the monitoring system shall include:

1)

2)

3)

4)

Menu-driven display with pushbutton navigation

Real-time clock (time and date)

Alarm history with time and date stamp

Memory with battery backup

2. Metering a. The following parameters shall be displayed:

1)

2)

Input AC voltage line-to-line

Input AC current for each phase

5)

6)

7)

Battery charge/discharge current

Output AC voltage line-to-line

Output AC current for each phase

11) Battery time left during battery operation a. The following alarm messages shall be displayed:

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 9

1)

3)

Mains Voltage Abnormal

Mains Freq. Abnormal

7)

8)

9)

Control Power 1 Fail

Parallel Comm. Fail

Bypass Unable To Track

13) Control Power 2 Fail

14) Unit Over Load

16) Bypass Phase Reversed

18) Load Sharing Fault

19) Parallel Connect Fault

20) Bypass Over Current

21) Output Ground Fault a. The following UPS status messages shall be displayed:

5)

6)

7)

8)

1)

2)

3)

4)

Rectifier (Off / Soft Start / Main Input On / Battery Input On)

Input Supply (Normal Mode / Battery Mode / All Off)

Battery Self Test (True / False)

Input Disconnect (Open / Closed)

EPO (True / False)

Charger (On / Off)

Output Disconnect (Open / Closed)

Maint. Disconnect (Open / Closed)

9) Bypass Disconnect (Open / Closed)

10) Inverter (Off / Soft Start / On)

11) Bypass (Normal / Unable To Trace / Abnormal)

12) Output Supply (All Off / Bypass Mode / Inverter Mode / Output Disable)

13) Inverter On (Enable / Disable)

5. Controls

6. a. UPS startup, shutdown and maintenance bypass operations shall be accomplished through pushbutton controls on the front panel. Menu-driven user prompts shall be provided to guide the operator through system operation without the use of additional manuals. Pushbuttons shall be provided to display the status of the UPS and to test and reset visual and audible alarms. A mimic screen shall be available on the LCD to depict a single-line diagram of the UPS with switch positions and power flow.

On-Line Battery Test

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 10

a. The UPS shall be provided with a menu-driven On-Line Battery Test feature. The test shall ensure the capability of the battery to supply power to the inverter while the load is supplied power in the normal mode.

D. Static Transfer Switch

1. General a. b.

A static transfer switch and bypass circuit shall be provided as an integral part of the UPS. The static switch shall be a naturally commutated high-speed static

(SCR-type) device rated to conduct full load current continuously. The switch shall have an overload rating to clear a 20-ampere load branch circuit breaker.

The static transfer switch control logic shall contain an automatic transfer control circuit that senses the status of the inverter logic signals and operating and alarm conditions. This control circuit shall provide an uninterrupted transfer of the load to an alternate bypass source without exceeding the transient limits specified herein, when an overload or malfunction occurs within the UPS or to bypass the UPS for maintenance.

E. a. The transfer control logic shall automatically turn on the static transfer switch, transferring the critical AC load to the bypass source, after the transfer logic senses any of the following conditions:

1)

2)

3)

Inverter overload capacity exceeded

Critical AC load overvoltage or undervoltage

UPS fault condition b. The transfer control logic shall inhibit an automatic transfer of the critical load to the bypass source if any of the following conditions are present:

1)

2)

Bypass frequency out of limits

Bypass out-of-synchronization range with inverter output

3. Uninterrupted Retransfer a. Retransfer of the critical AC load from the bypass source to the inverter output shall be automatically initiated unless inhibited by manual control. The transfer control logic shall inhibit an automatic retransfer of the critical load to the inverter if one of the following conditions exists:

1)

2)

3)

4)

Bypass out of synchronization range with inverter output

Inverter/bypass voltage difference exceeding preset limits

Overload condition exists in excess of inverter full load rating

UPS fault condition present

Maintenance Bypass Switch

1. General

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a. A manually operated maintenance bypass switch shall be incorporated into the

UPS cabinet to directly connect the critical load to the bypass AC input power source, bypassing the rectifier/charger, inverter and static transfer switch.

F. a. The battery cabinet shall include ten (10) year design life, valve-regulated, leadacid battery cells housed in a separate cabinet that matches the UPS cabinet styling to form an integral system lineup. All battery cell inter-connects shall utilize bolted connections, and all batteries shall include copper, inserted terminal posts allowing connector torque of 110 in-lb (12.4 Nm). Battery cells shall be mounted on slide-out trays for ease of maintenance. A battery disconnect circuit breaker shall be included for isolation of the battery pack from the UPS module. Casters and leveling feet shall also be provided with the battery cabinet for ease of installation.

When the application calls for the battery cabinet to be bolted to the UPS cabinet, an interconnecting cable kit will be available, precut and pre-lugged.

Accessories included with UPS System

1. Web Card (equivalent to Liebert NX IntelliSlot, ISWEB-LB)

2. a. Web card provides communication outputs to indicate a change of status of the

UPS. Outputs are provided for:

1) SNMP

2) HTML - Web page

3) Factory and network management software systems

Provide dry-form "C" contacts for remote indication of the following conditions using the campus Schneider Electric building automation system (BAS). a. UPS on battery.

3. c. d. e.

UPS load-on bypass.

UPS in alarm condition.

UPS off (maintenance bypass closed).

Matching Maintenance Bypass and Distribution Cabinet (BDC) a. A make-before-break maintenance bypass with Solenoid Key Release Unit

(SKRU) interlock shall be available in a cabinet that matches and may be bolted up to the UPS. Installation of the cabinet shall not affect the cooling ability of the

UPS. Thermal-magnetic breakers shall be provided for bypass and maintenance isolation.

1)

2)

3)

4)

Cabinet includes the external maintenance bypass circuit allowing wraparound maintenance of the UPS and Battery Modules (without shutdown of the connected loads).

Equipped with a 3-Breaker bypass circuit and interlock by solenoid key release unit (SKRU) to the UPS Module to ensure proper operation

Cabinet is also equipped with a main output step-down isolation transformer

Sized for the 120kVA future upgraded rating

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 12

b. c.

5)

6)

7)

8)

9)

Provided with integral connection to the UPS Module to provide a separately derived source and computer grade grounding electrode conductor (GEC)

Provide one (1) 225A output load breaker to feed remote panelboard(s).

Provide one (1) 125A output load breaker to feed existing power distribution unit (PDU).

Casters and leveling feet

Shipped separately and included with the inter-cabinet interconnecting cables for bolting the Bypass Distribution cabinet to the right side of the UPS

BDC Frame Construction and Enclosure

1)

2)

3)

4)

5)

The frame shall be constructed of galvanized steel and pop-riveted to provide a strong substructure. The enclosure shall be mounted on heavyduty swivel casters for portability and ease of installation and shall be provided with permanent leveling jacks for final installation. The unit shall have easily removable output cable trays on the top and bottom to allow matching the size and number of cable/conduit openings to the site requirements. All service shall be capable of being performed with access to the front and top. Retrofitting additional power distribution cables shall require access to the front of the unit only. A tool shall be required to remove the exterior panels, which access the hazardous voltage area of the unit.

The unit shall have lockable, removable, hinged front (and rear) door(s) that are 16-gauge perforated sheet metal construction to maximize ventilation. A two-point latch with key lock is provided for security. Doors shall provide access to the main input circuit breaker and to all output circuit breakers.

Doors and side panels shall be finished in powder-coat black.

The unit shall be naturally convection-cooled. No fans for forced-air cooling system shall be used. The convection cooling method shall allow continuous full-load operation without activation of overtemperature circuits. Heat rejection shall be through a screened protective top, which prohibits entry of foreign material.

The unit is designed to attach to the UPS to provide bypass, distribution and monitoring.

Dimensions shall be a maximum of 70.5 in. (1790mm) wide by 78.5 in.

(1994mm) high by 39.5 in. (1003mm) deep. The distributed floor weight shall be less than 250 lb./sq.ft. (1225 kg/sq.m).

BDC Input Power Connections and Cable Entry

1)

2)

Input power terminal blocks or busbar for 2-hole lugs shall be provided for connection of the input power conductors and a parity-sized insulated ground conductor.

The BDC shall have provisions for top and bottom cable entry and exit. d. BDC Bypass Input Breaker (BIB)

1) The BDC shall be equipped with a bypass input circuit breaker to provide overcurrent protection and a means for disconnecting all power to the input of the UPS. The bypass input breaker shall be a thermal-magnetic three-pole molded case circuit breaker sized for 125% of the specified full load input current plus recharge current and rated for 600 VAC. The minimum UL-listed

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 13

e. f. g. interrupting rating for the main input circuit breaker shall be 65,000 RMS symmetrical amperes at 480 volts AC.

BDC Maintenance Bypass

1) The BDC shall be equipped with a make-before-break maintenance bypass with key interlock system. Thermal-magnetic three-pole molded case circuit breakers shall be provided for maintenance bypass (MBB) and for maintenance isolation (MIB). Each circuit breaker shall have an interrupting rating of 65,000 RMS symmetrical amperes at 480 volts AC.

BDC Isolation Transformer

1) The unit shall contain an electrostatically shielded isolation transformer. The transformer shall be a dry-type, double-shielded, three-phase, common-core, convection air-cooled transformer. The transformer shall conform to UL1561, with 302°F (150°C) maximum temperature rise. All transformer windings shall be copper. The transformer shall be energy efficient and meet NEMA standards TP-1 2002. The transformer shall exhibit the following characteristics: percent impedance 4.7 to 5.3%; common mode noise attenuation 120 dB; harmonic voltage distortion 0.5% maximum additive; fullload efficiency 97.1 to 98%.

2) The isolation transformer shall be provided with six full-capacity compensation taps at 2-1/2% increments to accommodate field adjustment to match the source voltage. These compensation taps shall be easily

3) accessible by removing the front accent panel. Tap changes include: two above nominal voltage (upper range limit of +5%), nominal voltage and four below nominal voltage (lower range limit of -10%).

The unit shall be provided with thermal overload protection for the transformer. An alarm shall notify personnel if the transformer temperature reaches 356°F (180°C). The unit shall automatically shut down if the transformer temperature reaches 392°F (200°C). Temperature sensors shall be located in each coil of the three phase windings.

BDC Computer Grade Ground

1) The BDC shall include a single-point ground in accordance with sensitive electronic load manufacturer’s recommendations, IEEE Std. 1100 and the requirements of the NEC. The transformer output neutral shall be solidly grounded in accordance with NEC article 250-26. Grounding conductors shall be sized in accordance with IEC 364-HD-384 and applicable national and local codes.

1) The system shall contain two (2) vertically mounted bolt-in output panelboards (manufactured by Square D, G.E., Eaton or Siemens) for distribution to the intended loads. Each output distribution panelboard shall be individually protected by a main panelboard circuit breaker. Each panelboard shall be totally enclosed with a hinged accent panel that provides access to that panelboard without exposing other portions of the unit. The panelboard shall have a rating of 225 amperes, with an overall short-circuit current rating as required for fully coordinated overcurrent protection for the

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 14

i. entire UPS system (include coordination study with submittals). The panelboards shall provide a total of 84 single-pole branch circuit breaker positions. Each panelboard shall include separate isolated neutral and safety-ground busbars for the neutral and safety-ground connections for at least 42 output circuits. The neutral busbar and wiring shall be sized for at least 1.73 times the panelboard full load rating to accommodate high harmonic neutral currents associated with single-phase nonlinear loads.

BDC Output Load Breakers

1) The BDC shall be equipped with two (2) 225A output load breakers to feed remote distribution panelboards.

PART 3 - EXECUTION

3.1

FIELD QUALITY CONTROL AND SITE CHECKOUT / START-UP

A. The following inspections and test procedures shall be performed by factory-trained field service personnel during the UPS final checkout and startup. a. b. c. d. e. f. g.

Inspect equipment for signs of damage.

Verify installation per drawings.

Inspect cabinets for foreign objects.

Verify neutral and ground conductors are properly sized and configured.

Inspect battery cases.

Inspect battery for proper polarity.

Verify all printed circuit boards are configured properly. a. b. c.

Check all control wiring connections for tightness.

Check all power wiring connections for tightness.

Check all terminal screws, nuts and/or spade lugs for tightness. a. b. c.

Check all fuses for continuity.

Confirm input voltage and phase rotation is correct.

Assure connection and voltage of the battery string(s).

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 15

3.2

MANUFACTURER’S FIELD SERVICE

B.

1.

2.

3.

The UPS manufacturer shall directly employ a nationwide service organization consisting of factory-trained field service personnel dedicated to the startup and maintenance of UPS and power equipment.

The manufacturer shall provide a national dispatch center to coordinate field service personnel schedules. One toll-free number shall reach a qualified support person 24 hours a day, 7 days a week, 365 days a year. If emergency service is required, on-site response time shall be four hours or less within 150 miles of a factory-authorized service center.

Two local customer engineers shall be assigned to the site with a regional office as a backup. Escalation procedures shall be in place to notify Technical Support if a site is not functioning within 24 hours.

Replacement Parts Stocking

1.

2.

Parts shall be available through an extensive network to ensure round-the-clock parts availability throughout the country.

Spare parts shall be stocked by local field service personnel with backup available from national parts center and the manufacturing location. A national parts center Customer

Support Parts Coordinator shall be on call 24 hours a day, 7 days a week, 365 days a year for immediate parts availability.

1. A complete offering of preventive and full-service maintenance contracts for both the

UPS system and battery system shall be available.

1. The UPS manufacturer shall offer as an option an automated site-monitoring service.

This service shall be staffed by a qualified support person 24 hours a day, 7 days a week, 365 days a year. At the detection of an alarm within the UPS, the controls shall initiate communications with the monitoring service. The monitoring service shall be capable of interpreting the communicated alarms to allow dispatch of a service engineer.

STATIC UNINTERRUPTIBLE POWER SUPPLY 26 33 53 - 16

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