Discontinued product liebert Precision Power Center 15 225 kva top Exit Power Conditioning System guide specifications



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DISCONTINUED PRODUCT

Liebert Precision Power Center

15 - 225 kVA Top Exit Power Conditioning System

GUIDE SPECIFICATIONS
  1. GENERAL

    1. SUMMARY


These specifications describe requirements for a complete power conditioning and distribution system, supplying computer grade power to sensitive loads. The specified system shall provide isolation*, distribution, control and monitoring of AC power. It shall include all equipment to properly interface the AC power source to the intended load.

* Units without a transformer do not provide isolation.


    1. STANDARDS


The specified system shall be designed, manufactured, tested and installed in compliance with:

  • American National Standards Institute (ANSI)

  • Canadian Standards Association (CSA)

  • Federal Information Processing Standards Publication 94 (FIPS Pub 94)

  • Institute of Electrical and Electronics Engineers (IEEE)

  • ISO 9001

  • National Electrical Code (NEC - NFPA 70)

  • National Electrical Manufacturers Association (NEMA)

  • National Fire Protection Association (NFPA 75)

  • Underwriters Laboratories (UL)

60 Hz units shall be UL listed as a complete system under UL 60950 Standard for Information Technology Equipment.

The specified system shall comply with latest FCC Part 15 EMI emission limits for Class A computing devices.

The system shall safely withstand without misoperation or damage:


  • Transient voltage surges on the AC power input as defined by ANSI/IEEE C62.41 for Category B3 locations (high surge exposure industrial and commercial facilities),

  • Electrostatic discharges (ESD) up to 10 kV at any point on the exterior of the unit and

  • Electromagnetic fields from portable transmitters within 3 ft. (1m) of the unit.
    1. SYSTEM DESCRIPTION

      1. Electrical Requirements


Output capacity shall be ((15) (30) (50) (75) (100) (125) (150) (200) (225)) kVA.

Input voltage shall be ((600) (480) (415) (400) (380) (240) (208) (______)) volts AC, ((60) (50)) Hz, three-phase, ((three) (four))-wire-plus-ground.

Output voltage shall be ((120/208) (220/380) (230/400) (240/415) (______)) volts AC, three-phase, four-wire-plus-ground, wye configuration.

      1. Environmental Requirements


Storage temperature range shall be -55 to +85°C (-67 to +185°F).

Operating temperature range shall be 0 to 40°C (+32 to 104°F).

Operation shall be reliable in an environment with 0% to 95% noncondensing relative humidity.

The audible noise level of the specified system shall be less than the ANSI C89 standard for transformers.


    1. DOCUMENTATION

      1. Equipment Manual


The manufacturer shall furnish an installation manual with installation, startup, operation and maintenance instructions for the specified system.
      1. Drawings


Wiring diagrams and drawings of major components shall be furnished.
      1. Spare Parts


A list of recommended spare parts shall be supplied at the customer’s request.
      1. User’s List


An in-service user’s list shall be furnished upon request.
    1. WARRANTY


The manufacturer shall provide a one-year warranty against defects in material and workmanship for 12 months after initial startup or 18 months after ship date, whichever occurs first. (Refer to the Warranty Statement for details.)
    1. QUALITY ASSURANCE


The specified system shall be factory-tested before shipment. Testing shall include, but shall not be limited to: Quality Control Checks, “Hi-Pot” Test (two times rated voltage plus 1000 volts, per UL requirements) and Metering Calibration Tests. The system shall be designed and manufactured according to world class quality standards. The manufacturer shall be ISO 9001 certified.
  1. PRODUCT

    1. COMPONENTS

      1. Frame Construction and Enclosure


The frame shall be constructed of welded steel to provide a strong substructure. The enclosure shall be mounted on four (4) heavy duty swivel casters for portability and ease of installation and shall be provided with four permanent leveling jacks for final installation. The unit shall have a solid top and side vents with provisions for entrance and exit of all input and output cabling through the top and bottom of the unit. A conduit termination plate with a minimum of 42 cable/conduit openings shall be provided for each output panelboard for both top and bottom exit. Additional space shall also be provided for input conduit landings. All service shall be capable of being performed with access to the front plus a choice of any one side or rear for installation flexibility. 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. To ensure grounding integrity and for static protection and EMI/RFI shielding, the removable exterior panels shall be grounded to the frame by way of stranded copper wire. Hinged double front doors shall provide access to the main input circuit breaker and to all output circuit breakers. The unit shall be custom-painted to match or accent the Data Processing equipment. The color of the exterior panels shall be [(manufacturer’s standard color) ( )].

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 over-temperature circuits. Heat rejection shall be through screened protective bottom and top vents, which prohibits entry of foreign material, on each side panel.

The frame shall be configured to accept future field installation of additional bolt-on top exit distribution sections containing additional panelboard and cable tray capacity.

The complete system dimensions shall be a maximum of [32 in. (813 mm)] [44 in. (1118 mm)] [62 in. (1575 mm)] wide by 68 in. (1727 mm) high by 32 in. (813 mm) deep. The distributed floor weight shall be less than 250 lb./sq.ft. (1225 kg/sq. m).


      1. Input Power Connections


Power terminal blocks shall be provided for connection of the input power conductors and a parity-sized insulated ground conductor.
      1. Main Input Circuit Breaker


The specified unit shall be equipped with a main input circuit breaker to provide overcurrent protection and a means for disconnecting all power to the unit. The main input circuit breaker shall be a three-pole molded case circuit breaker sized for 125% of the specified full load input current and rated for 600 VAC. The minimum UL-listed interrupting rating for the main input circuit breaker shall be ((25,000) ( )) RMS symmetrical amperes at 480 volts AC. The main input circuit breaker shall include a 24 VDC shunt trip mechanism to interface with unit controls, EPO buttons and other remote controls as required by the NEC and local codes.
      1. Isolation Transformer


[NOTE: For the “Transformerless Configuration,” delete this section.]

The unit shall contain an electrostatically shielded isolation transformer with a rating as described in Section 1.3. The transformer shall be a dry-type, double-shielded, three-phase, common-core, convection air-cooled transformer. The transformer shall conform to UL1561, with 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, 3.7 to 5.3%; common mode noise attenuation, 120 dB; harmonic voltage distortion, 0.5% maximum additive; full-load efficiency, 96 to 98.6%.

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 accessible by removal of one exterior 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 additional thermal overload protection for the transformer. An alarm shall notify personnel if the transformer temperature reaches 180°C. The unit shall automatically shut down if the transformer temperature reaches 200°C. Temperature sensors shall be located in each coil of the three phase windings.


      1. Manual Restart


The specified unit shall be equipped with a manual restart feature to allow for an orderly supervised startup after power failure. The control circuit shall automatically energize the shunt trip mechanism of the main input breaker upon sensing output voltage failure. A field-selectable auto-restart mode shall be provided to deactivate the manual restart if desired.
      1. Emergency Power Off (EPO)


The local EPO shall include a fully guarded and illuminated “Emergency Power Off” pushbutton. Pressing the EPO switch shall immediately shut down the unit by activating the shunt trip of the main input circuit breaker. As part of the EPO circuit, an interface shall also be provided for connecting one or more normally open or normally closed remote EPO switches to the EPO circuit. For flexibility in meeting shutdown control schemes, the local EPO (unit shutdown) circuit shall be isolated from the remote EPO (room shutdown) circuit. The remote EPO circuit shall be designed to allow direct connection of multiple units with single and multiple shutdown control contacts.
      1. Computer Grade Ground


The specified system shall include a computer-grade, single-point ground in accordance with computer 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.
      1. Output Distribution Panelboards


The specified system shall contain ((one) (two)) vertically mounted output (Square D) (GE) (bolt-in) (plug-in) panelboards 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 hinged accent covers that provide access to that panelboard without exposing other portions of the unit. The panelboard shall have a rating of 225 amperes, with an interrupting rating of (10kA) (22kA [not available @380-415V]) RMS at 240/120 VAC. The panelboards shall provide a total of ((42) (84)) single-pole branch circuit breaker positions. Each panelboard shall include separate isolated neutral and safety-ground bus bars for the neutral and safety-ground connections for at least 42 output circuits. The neutral bus bar 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. The output distribution wiring shall be physically isolated from the transformer compartment and input wiring.
      1. Branch Circuit Breakers


Each load shall be protected by an individual branch circuit breaker as shown on the plans. Single-pole, two-pole and three-pole [(Square D) (GE) (plug-in) (bolt-on) ] type branch breakers up through 100 amperes shall be utilized. Each branch circuit breaker shall provide overcurrent protection and shall clearly indicate the ON, OFF and TRIPPED positions. All branch circuit breakers shall have a minimum interrupting rating of 10kA RMS at 240/120 VAC. Each branch circuit breaker shall be sized in accordance with the NEC and shall be UL/CSA listed. Branch circuit breakers shall have an associated directory label, located adjacent to the breaker, identifying the branch circuit number and the equipment being served.
      1. Output Distribution Cables


The cable supplying each load shall consist of UL/CSA listed liquid-tight flexible metal conduit containing the required THHN copper insulated power, neutral and parity-sized ground conductors. The flexible conduit shall be liquid-tight, insulated and shielded to minimize electrical or mechanical disturbances to the conductors. The length of each cable and the type of receptacle/termination shall be as specified on the detailed cable schedule. Each output distribution cable shall be permanently labeled at each end of the cable with the assigned circuit number and receptacle type, equipment identification and cable length. Each cable shall be thoroughly factory-checked and factory-tested. Tests shall include continuity, phase rotation and a Hi Pot test at twice rated circuit voltage plus 1000 volts. All output cables can be wound on spools mounted on casters to facilitate handling and installation. Each cable shall be a UL listed assembly.
    1. BASIC MONITORING SYSTEM


[NOTE: Select either a Basic Monitoring system or a Power Monitoring system.]

The basic monitoring system shall have transformer overtemperature and Emergency Power Off (EPO) circuits. All indicators and controls shall be on the front door, along with identifying system number.

The transformer overtemperature circuit shall include an audible and visual alarm if any internal transformer winding temperature reaches 180°C. A SILENCE switch shall be provided to quiet the audible alarm. The transformer overtemperature circuit shall also trip the main input breaker to remove power automatically when any transformer winding temperature reaches 200°C.

    1. POWER MONITORING SYSTEM


[NOTE: Select either a Basic Monitoring system or a Power Monitoring system.]

The specified system shall be equipped with a microprocessor-based power monitor panel. The monitor panel shall gather and process information from electrical and environmental sensors, relays and switches both internal and external to the unit. The monitored parameters and alarms shall be displayed on the unit monitor panel and shall also be available for communication to a Liebert centralized monitoring system using a two-wire, twisted-pair, low-voltage signal circuit having an RS-422 format for reliable communication up to 1000 meters. Additionally, the monitor panel shall be equipped with an RS-232 service port for adjusting parameters and performing diagnostics and an isolated RS-232 ASCII port for communication to other monitoring systems.


      1. Monitored Parameters


The monitoring system shall monitor and display all of the following parameters:

  • Input Voltage, Line-To-Line for all three phases

  • Output Voltages, Line-to-Line for all three phases

  • Output Voltages, Line-To-Neutral for all three phases

  • Output Voltage Total Harmonic Distortion (THD) for all three phases

  • Output Current for all three phases

  • Output Current Total Harmonic Distortion (THD) all three phases

  • Output Current Crest Factor (Peak/RMS) for all three phases

  • Output Current Harmonic K-Factor for all three phases

  • Output Neutral Current

  • System Ground Current

  • Output Frequency

  • Output kVA

  • Output kW

  • Output Power Factor

  • Output kW-Hours

  • Percent Load

  • Date

  • Time

All three phases of the three-phase parameters shall be displayed simultaneously. All voltage and current parameters shall be monitored using true RMS measurements for accurate representation of non-sinusoidal waveforms typical of computers and other sensitive loads.
      1. Alarm Annunciation


The monitoring system shall detect and annunciate by audible alarm and alarm message the following conditions:

  • Output Overvoltage

  • Output Undervoltage

  • Output Overcurrent

  • Neutral Overcurrent

  • Ground Overcurrent

  • Output Voltage Distortion

  • Phase Sequence Error

  • Phase Loss

  • Frequency Deviation

  • Transformer Overtemp

All alarm thresholds for monitored parameters shall be adjustable by way of the service port to match site requirements. The factory setpoints for the alarms shall be as follows:

  • Output Overvoltage - output voltage exceeds +6% of nominal

  • Output Undervoltage - output voltage falls below -13% of nominal

  • Output Overcurrent - output current exceeds 95% of full load amps

  • Neutral Overcurrent - neutral current exceeds 95% of full load amps

  • Ground Overcurrent - ground current exceeds 5 amps

  • Output Voltage Distortion - output voltage THD exceeds 10%

  • Frequency Deviation - output frequency exceeds ±0.5Hz of nominal

To facilitate troubleshooting, all alarms shall be stored in battery-backed (non-volatile) memory until reset to protect against erasure by a power outage. Alarms shall be able to be manually reset after the alarm condition has been corrected either at the unit or by way of the central monitoring system.
      1. Custom Alarm Annunciation


The monitoring system shall be capable of providing alarm annunciation for up to five contact closures (4 N.O. and 1 N.C.). A custom alarm message up to 20 characters shall be provided for each contact. Alarm messages shall be programmable by way of the service port to match site requirements.
      1. Summary Alarm Contact


A Form C (1 N.O. and 1 N.C.) Summary Alarm Contact shall be provided for remote alarm status. The contacts shall change state upon occurrence of any alarm and shall rest upon alarm silence.
      1. Display


All monitored parameters and alarm messages shall be displayed on a 4 x 20 character, high-visibility liquid crystal display (LCD) located on the unit front door within a decorative bezel. Included in the bezel shall be an Identifying Unit Number, Emergency Power Off (EPO) switch and an Alarm Present/Silence switch.

The Alarm Present/Silence switch shall be illuminated upon occurrence of any alarm and remain illuminated until all alarms are reset. The switch shall also be used to silence the audible alarm and reset inactive alarms.


      1. Autoscan


For ease of operation, the monitoring system shall include an autoscan mode which provides continuous sequential selection and display of all monitored parameters and active alarm messages. A “Hold/Sequence” switch shall be provided to interrupt the autoscan mode and manually select the displayed parameters when desired.
    1. ACCESSORIES (OPTIONAL COMPONENTS)

      1. Input Lightning/Surge Arrester


The specified unit shall be equipped with a secondary-class surge arrester to divert high-voltage input power surges quickly and safely to ground. The surge arrester shall be mounted ahead of all electrical components to provide maximum protection of the unit insulation and wiring. The surge arrester shall be capable of repeated operations. It shall consist of utility-grade metal-oxide varistors rated for up to 20,000 amps of surge current. The surge arrester shall be rated for maximum FOW sparkover of 3200 volts with maximum discharge voltage of 2.2 kV at 1500 amperes, assuming a standard 8 x 20 microsecond waveform.
      1. Output Surge Suppression Module (Basic)


The unit shall be equipped with a surge suppression module to eliminate high-speed, high-energy transients and to filter high frequency noise. The surge suppression module shall be mounted on the output of the unit. The surge suppressor components shall be UL recognized.

The surge suppressor shall utilize high-energy metal oxide varistors with less than 1 nanosecond response time. The clipping level shall be 212 volts on a system with a nominal peak line voltage of 170 volts and 354 volts on a system with a nominal peak line voltage of 340 volts. Peak current handling capability shall be at least 13,000 amperes based on an 8 x 20 microsecond waveform. Energy absorption capability shall be at least 200 joules per phase.

A passive filter, utilizing metalized polypropylene film capacitors, shall provide normal mode noise attenuation of at least 20 dB from 10 kHz to 1 MHz. The capacitors shall be equipped with an integral pressure-sensitive interrupter to provide short-circuit current interrupting capability of up to 10,000 amperes at 600 VAC.

      1. High Energy Output Surge Suppression


The unit shall be equipped with a high energy, UL1449 and UL1283 listed, Transient Voltage Surge Suppression (TVSS) module connected to the unit output with minimal interconnecting wiring for maximum surge suppression. The TVSS shall consist of multiple, gapless Metal Oxide Varistor (MOV) arrays with their clamping voltages matched to within 1%. Each MOV shall be individually fused to protect against MOV failure while still allowing maximum rated surge current to flow without fuse operation. The fuses shall have a 100 kA interrupting capacity. Each array shall be capable of withstanding at least 1250 IEEE C62:41 category C3 surges (20 kV, 10 kA) without failure. The complete TVSS module shall have a total surge current capacity of 80 kA per phase based on a standard 8 x 20 microsecond surge waveform. The UL1449 surge clamping rating shall not exceed 400 volts for a 120/208 volt system. The maximum continuous operating voltage shall be at least 150 VAC for a 120/208 volt system. The TVSS shall also provide electrical noise attenuation of 50 dB from 100 kHz to 100 MHz (based on MIL220A and 50 OHM impedance). An alarm contact of the TVSS module shall be connected to the unit monitoring system to annunciate any TVSS failure.
      1. K-Rated Transformer


Unit transformer shall have a K20 rating in accordance with UL 1561 to allow full load operation with highly nonlinear loads having a harmonic K-Factor up to 20. Transformer neutral shall be sized for at least 200% of full load. The transformer shall be designed to operate with 100% single-phase, switch-mode power supplies and associated harmonic phase and neutral currents without derating.

The transformer shall be energy efficient and meet NEMA standards TP-1 2002. The transformer shall exhibit the following characteristics: percent impedance, 3.4 to 4.6%; common mode noise attenuation, 120 dB; harmonic voltage distortion, 0.5% maximum additive; full-load efficiency, 96 to 98.6%.

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 accessible by removal of one exterior 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 additional thermal overload protection for the transformer. An alarm shall notify personnel if the transformer temperature reaches 180°C. The unit shall automatically shut down if the transformer temperature reaches 200°C. Temperature sensors shall be located in each coil of the three phase windings.


      1. Network Interface Card (NIC)


STS shall have an OpenComms Network card, which enables the STS to communicate to a network management system (NMS). The Network Interface Card (NIC) will include internal hardware and software to communicate (via SNMP and HTTP) to any I.P.-based Ethernet network through a RJ-45 connector. The NIC shall provide redundant paths for communications that make it possible to connect to a Building Management System (BMS) using Modbus while simultaneously communicating to a NMS through SNMP and HTTP. A terminal block shall be provided to connect to Modbus.
      1. Isolated Ground Busbar


An isolated ground busbar shall be provided for each panelboard to connect the output cable isolated ground conductor. The isolated ground busbar is in addition to the standard equipment ground busbar.
      1. Certified Test Report


A certified copy of the factory test report shall be provided for each unit.
      1. Factory Witness Test


The owner and/or the owner’s representative shall factory witness test each unit. The factory will perform its standard witness test to demonstrate that the unit meets the STS specification.
      1. Remote Emergency Power Off (REPO) Switches


Provisions shall be available for adding multiple REPO switches to meet specific site needs and local codes. The REPO switch shall activate the shunt trip of the main input circuit breaker to shut down the system. Each REPO shall be a fully guarded, normally open, illuminated switch in a wall box. REPO switch shall have ((50) (100) (150)) ft. of 3-conductor cable to connect to the specified system.
      1. Phase Rotation Meter


A hand-held phase-rotation meter shall be included to verify rotation of any three-phase circuit rated 600 volts AC or less. It shall indicate “ABC” or “ACB” phase rotation.
      1. Export Crating


Heavy-duty solid wood crating shall be provided to meet international requirements regarding package strength and special markings for overseas shipments.
  1. EXECUTION


Factory startup, preventive maintenance and full service for the specified system shall be available and included upon request. The manufacturer shall directly employ a service organization of factory-trained field service personnel dedicated to the startup, maintenance and repair of the manufacturer’s power equipment. The manufacturer shall maintain a dispatch center 24 hours per day, 365 days per year, to minimize service response time and to maximize availability of qualified service personnel.

NOTE: These Guide Specifications comply with the outlines of the Construction Specifications Institute per CSI MP-2-1 and MP-2-2. In correspondence, reference Liebert document SL-20427_REV1_05-07.


SL-20427_REV1_05-07 Guide Specifications



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