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Liebert® NXL™ UPS
for a 250-400kVA (per module) 1+N (Distributed Static Switch)
Multi-Module Uninterruptible Power System
These specifications describe requirements for an Uninterruptible Power System (UPS) consisting of one or more single-module UPS units connected in parallel without the need for either a system control cabinet or a centralized system control cabinet with a static bypass switch. The UPS shall automatically maintain AC power within specified tolerances to the critical load, without interruption, during failure or deterioration of the AC input power. The UPS shall be expandable by paralleling additional modules of the same rating, to provide for module redundancy or load growth requirements.
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.
The UPS and all associated equipment and components shall be manufactured in accordance with the following applicable standards:
The UPS shall be UL listed per UL Standard 1778, 4th Edition, Uninterruptible Power Supplies and shall be CSA certified.
The UPS shall comply with FCC Rules and Regulations, Part 15, Subclass B, Class A.
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.
The UPS shall be sized to provide a minimum of ____ kVA and a minimum of ____ kW output.
The UPS shall be able to power at full rated output kW loads with power factor between 0.9 lagging and 0.95 leading.
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.
The UPS shall have a 6-pulse solid state rectifier.
An input filter with automatic disconnect for input power factor control shall be provided.
The UPS shall be equipped with an output isolation transformer.
The UPS shall operate as an on-line reverse transfer system in the following modes:
The solid-state power components, magnetics, electronic devices, and overcurrent protection devices shall operate within the manufacturer’s recommended temperature when the UPS is operating at 100% critical load and maintain battery charging with the following conditions occurring simultaneously.
Step 1 - Independently adjustable 25-125% of normal full load input current
Step 2 - Independently adjustable 25-125% for on-generator operation
Step 1 - Independently adjustable 0-20% of maximum battery discharge current
Step 2 - Independently adjustable 0-20% of maximum battery discharge current
Balanced loads 120° ±0.5°
Unbalanced loads 120° ±1°
100% Load Step ±5%
Loss of/return to AC input power ±1%
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 Hz ± 0.1 Hz. The system shall not transfer to bypass under these conditions (except item 3).
Maximum 2% RMS total (linear load)
Maximum 2.5% RMS total for up to 100% non-linear load, per IEC 62040-3
110% of full load for 60 minutes
125% of full load for 10 minutes
150% of full load for a minimum of 60 seconds
200% of full load for a minimum of 200 milliseconds
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.