System description design Requirements




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Liebert Series 610 UPS

GUIDE SPECIFICATIONS

for a 500-750 kVA
Single-Module Uninterruptible Power System

  1. GENERAL

    1. SUMMARY


These specifications describe requirements for an Uninterruptible Power System (UPS). The UPS shall automatically maintain AC power within specified tolerances to the critical load, without interruption, during failure or deterioration of the normal power source.

The manufacturer shall design and furnish all materials and equipment to be fully compatible with electrical, environmental, and space conditions at the site. It shall include all equipment to properly interface the AC power source to the intended load and be designed for unattended operation.
    1. STANDARDS


The UPS and all associated equipment and components shall be manufactured in accordance with the following applicable standards:

  • CSA 22.2, No. 107.1

  • IEEE 587, Category B (ANSI C62.41)

  • National Electrical Code (NFPA 70)

  • NEMA PE-1

  • OSHA

  • UL Standard 1778

The UPS shall be ETL listed per UL Standard 1778 Uninterruptible Power Supplies, and shall be CSA certified.

The Quality System for the engineering and manufacturing facility shall be certified to conform to Quality System Standard ISO 9001 for the design and manufacture of power protection systems for computers and other sensitive electronics.
    1. SYSTEM DESCRIPTION

      1. Design Requirements


The UPS shall be sized to provide a minimum of ____ kVA and a minimum of ____ kW output.

Load voltage and bypass line voltage shall be ____VAC, three phase, 3-wire or 4-wire. Input voltage shall be ____VAC, three-phase, 3-wire.

The battery shall support the UPS at 100% rated kW load for at least _____ minutes at 77°F (25°C) at startup.


      1. Modes of Operation


The UPS shall operate as an on-line reverse transfer system in the following modes:

  1. Normal: The critical AC load is continuously powered by the UPS inverter. The rectifier/ charger derives power from the utility AC source and supplies DC power to the inverter, while simultaneously float charging the battery.

  2. Emergency: Upon failure of utility AC power, the critical AC load is powered by the inverter which, without any switching, obtains its power from the battery plant. There shall be no interruption in power to the critical load upon failure or restoration of the utility AC source.

  3. Recharge: Upon restoration of the utility AC source, the rectifier/charger powers the inverter and simultaneously recharges the battery. This shall be an automatic function and shall cause no interruption to the critical AC load.

  4. Bypass: If the UPS must be taken out of service for maintenance or repair, the static transfer switch shall transfer the load to the bypass source. The transfer process shall cause no interruption in power to the critical AC load.

  5. Off-Battery: If the battery only is taken out of service for maintenance, it is disconnected from the rectifier/charger and inverter by means of an external disconnect circuit breaker. The UPS shall continue to function and meet all of the specified steady-state performance criteria, except for the power outage back-up time capability.
      1. Performance Requirements


The maximum working voltage, current, and di/dt of all solid-state power components and electronic devices shall not exceed 75% of the ratings established by their manufacturer. The operating temperature of solid-state component sub-assemblies shall not be greater than 75% of their ratings. Electrolytic capacitors shall be computer grade and be operated at no more than 95% of their voltage rating at the maximum rectifier charging voltage.
      1. Input


  1. Voltage Range: +10%, -15% of nominal (no battery discharge at -20%).

  1. Frequency Range: ±5%.

  2. Rectifier Walk-In/Inrush Current Limiting: 20% to 100% of full rated load over 15 seconds (adjustable).

  3. Sub-Cycle Magnetizing Inrush: Not to exceed 2-3 times normal full load input current for modules without optional input isolation transformer. Not to exceed 5-8 times normal full load input current with optional input isolation transformer and optional input filter.

  4. Power Factor: Minimum 0.85 lagging at full load with nominal input voltage (may be increased to 0.92 lagging with optional input filter).

  5. 2-Step Rectifier Input Current Limit:

Step 1 - Factory set at 115% (adjustable 100-125%) normal full load input current (750kVA/675kW adjustable 100-115%)

Step 2 - Factory set at 100% (adjustable 85-125%) for on-generator operation (750kVA/675kW adjustable 85-115%)

  1. 2-Step Battery Charge Current Limit:

Step 1 - Factory set at 10% (adjustable 1-25%) maximum battery charging current.

Step 2 - Factory set at 1% (adjustable 1-25%) maximum battery charging current.

  1. Reflected Current Distortion: Less than 30% THD at full load input current. The optional input filter shall reduce reflected input current distortion to less than 7% THD at full load. An optional 12-pulse rectifier shall reduce reflected input current distortion to less than 9% at full load and less than 4% with optional input filter.

  2. Surge Protection: Sustains input surges without damage per criteria listed in ANSI C62.41-1980.
      1. AC Output


  1. Load Rating: 104% continuous load rating at 104°F (40°C) for any combination of linear and non-linear loads at the capacity of the connected modules or rating of the system control console, whichever is less.

10 times continuous load rating for three cycles without closing the bypass breaker.

Load rating limited by system circuit breaker characteristics.

  1. Voltage Regulation: ±0.5% for balanced load, ±2% for 50% unbalanced load.

  2. Voltage Adjustment Range: ±5% manually.

  3. Automatic Line Drop Compensation: Adjustable 0 to +5% of nominal voltage.

  4. Frequency Regulation: 0.1%.

  5. Efficiency: Defined as output kW/input kW at rated lagging load power factor.

Not less than 94% for 480/480 VAC or 600/600 VAC input/output;

Not less than 92.5% for 480/480 VAC input/output with optional isolation transformer;

Optional input filter efficiency loss not to exceed 0.5%.

  1. Phase Imbalance:

Balanced loads 120° ±1°,

50% unbalanced loads 120° ±3°.

  1. Unbalanced Voltage Regulation (RMS Voltage Balance, Each Phase to the Average):

Balanced Load, ±1% from the arithmetic average of the 3 phases.

20% Unbalanced Load, ±1% from the arithmetic average of the 3 phases.

50% Unbalanced Load, ±2% from the arithmetic average of the 3 phases.

  1. Voltage Transients (Average of all Three Phases):

20% Load Step ±4%

50% Load Step ±4%

100% Load Step ±5%

Loss of/return to AC input power ±1%

Transfer to/from Bypass ±4%

  1. Output Voltage Transients

Voltage transients shall be limited to a maximum deviation from nominal system output volts of plus or minus 5% with recovery to within 1% of the nominal output voltage within one electrical cycle (16 milliseconds) for each of the following conditions. Limits shall apply to any UPS load within the UPS rating, and frequency shall be maintained at 60 Hertz plus or minus 0.1 Hertz. The system shall not transfer to bypass under these conditions (except item 3).

  1. 100% load step.

  2. Loss or return of AC input power, momentary sags, surges or spikes on the input to the UPS (all three phases or single phase).

  3. Uninterrupted transfer of the critical load to and from the UPS output and bypass power line (manually initiated or automatic).

  4. Trip a 10% rated ampere branch circuit breaker or clear a 10% rated fuse with a single-phase or three-phase fault.

  1. Voltage Harmonic Distortion:

Maximum 4% RMS total, maximum 2% any single harmonic (linear load).

Maximum 5% RMS total for up to 100% non-linear load.



  1. Overload at full Output Voltage with ±2% voltage regulation:

104% continuously.

125% of full load for 10 minutes

150% of full load for a minimum of 30 seconds.

  1. Current Limit: 155% full load current.

  2. Fault Clearing: Sub-cycle current of at least 300% but not more than 500% of normal full load current (when bypass is not available).
      1. Grounding


The AC output neutral shall be electrically isolated from the UPS chassis. The UPS chassis shall have an equipment ground terminal. A terminal for bonding the system neutral to facility service entrance ground (customer-provided cable) shall be provided.
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