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COMPONENTS

  1. Rectifier


The term rectifier shall denote the solid-state equipment and controls necessary to convert alternating current to regulated direct current to supply the inverter and charge the battery. The DC output of the rectifier shall meet the input requirements of the inverter without the battery being connected.

  1. Input Current Harmonic Distortion

The rectifier shall actively control and reduce input current distortion over the full operating range of the UPS without the need for an additional passive input filter. Input current THD shall be less than 3% at rated load and nominal voltage in double-conversion mode.

  1. Input Current Walk-In

The rectifier/charger shall provide a feature that limits, during the transfer from battery mode to on-line mode, the total initial power requirement at the input terminals to 0% of rated load and gradually increases power to 100% of full rating over the 2.5 to 90-second (adjustable) time interval with full rated rectifier power.

  1. Dynamic Current Input Limit Reduction

The rectifier, in conjunction with the other UPS controls and circuitry, shall adjust the current demanded for battery charging as a function of UPS wattage load and input voltage level.
      1. DC-DC Converter


The term DC-DC converter shall denote the equipment and controls to regulate the output of the rectifier to the levels appropriate for charging the battery and to boost the battery voltage to the level required to operate the inverter. The DC-DC converter shall be solid-state, capable of providing rated output power, and for increased performance shall be a pulse width-modulated design and shall utilize insulated gate bipolar transistors (IGBTs). The DC-DC converter shall control charging of the battery. The AC ripple voltage of the charger DC shall not exceed 1% RMS of the float voltage.

  1. Battery Recharge

In addition to supplying power for the load, the rectifier/charger shall be capable of supplying a minimum of 5% of the module full load power rating for recharging the battery. The battery recharge rate capability shall be sufficient to replace 95% of the battery discharge power within ten (10) times the discharge time while running at 95% of full load at nominal voltage, provided that the battery can accept recharge at that rate. After the battery is recharged, the rectifier/charger shall maintain the battery at full charge until the next emergency operation.

  1. Battery Equalize Charge

A manually initiated equalize charge feature shall be provided to apply an equalize voltage to the battery. The duration of equalize charge time shall be adjustable from 0 to 200 hours. A method shall be available to deactivate this feature for valve regulated battery systems.

  1. Thermal Runaway Protection and Battery Charger Control

The UPS shall provide temperature compensated charging. This function requires that the UPS be equipped with temperature sensors in each cabinet and an interface scheme provided by the UPS manufacturer. The UPS shall adjust the battery charging voltage based on the battery temperature reported from external battery temperature sensors. Temperature sensors shall be monitored for faulty measurements and shall be ignored if a fault is detected to prevent overcharging or undercharging the battery. When multiple sensors are used, the voltage shall be based on the average temperature measured. Excessive difference in the temperature measurements shall be reported and the charging voltage adjusted to protect the batteries from excessive current.In addition, the UPS shall be programmable so that a battery overtemperature condition can be detected in any single battery cabinet and a three-stage response shall be initiated:

  • When the temperature in the cabinet reaches 100.4°F (38°C), temperature compensation shall be stopped and an alarm generated.

  • When the temperature in the cabinet reaches 109.4°F (43°C), the charger will shut off completely and the circuit breaker for any individual overtemperature battery cabinet or string may be opened, isolating that cabinet or string only and retaining reduced battery protection for the UPS. This condition shall be displayed on the UPS HMI screen and in the event log.

  • Once the breaker on the affected cabinet or string has been tripped, the UPS shall resume normal charging with the remaining battery cabinets or strings.

The system shall meet the requirements of the IFC 2012 for preventing thermal runaway battery protection for the UPS. This condition will be displayed on the UPS HMI screen, and in the event log.

Battery charging may also be stopped by an external signal that may be activated by a contact closure to indicate “on generator” operation or other condition (including battery overtemperature, presence of excessive hydrogen, or failure of the room ventilator fan) under which battery charging is undesirable or inadvisable.

  1. Overvoltage Protection

There shall be DC overvoltage protection so that if the DC voltage rises to the pre-set limit, the UPS shall shut down automatically and initiate an uninterrupted load transfer to bypass, or shall disconnect the battery via the DC breaker(s) in the battery string.

  1. Battery Load Testing

The UPS shall be capable of performing battery load testing under operator supervision. To accomplish this, the rectifier shall reduce charging voltage to force the batteries to carry the load for a short time. If the curve of battery voltage drop indicates diminished battery capacity, the UPS shall display an alarm message. If the voltage drop indicates battery failure, the UPS shall terminate the test immediately and annunciate the appropriate alarms.
      1. Inverter


The term inverter shall denote the equipment and controls to convert direct current from the rectifier or battery via the DC-DC converter to precise alternating current 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 shall utilize insulated gate bipolar transistors (IGBTs). To further enhance reliable performance and efficiency, the inverter shall not require an inverter output series static switch/isolator for the purposes of overload or fault isolation or transfers to bypass.

  1. Overload Capability

The inverter shall be able to sustain an overload across its output terminals while supplying full rated voltage for up to 150% for 60 seconds. The inverter shall be capable of at least 200% current for short-circuit conditions including phase-to-phase, phase-to-ground and three-phase faults. After the fault is removed, the UPS shall return to normal operation without damage. If the short circuit is sustained, the load shall be transferred to the bypass source and the inverter shall disconnect automatically from the critical load bus.

  1. Output Frequency

The inverter shall track the bypass continuously, providing the bypass source maintains a frequency of 60Hz ±1% (0.6 Hz). The inverter shall change its frequency (slew rate) at less than 1Hz per second to maintain synchronous operation with the bypass. This shall allow make-before-break manual or automatic transfers. If the bypass fails to maintain proper frequency, the inverter shall revert to an internal oscillator, which shall be temperature compensated and shall hold the inverter output frequency to 0.1% from the rated frequency for steady-state and transient conditions. Drift shall not exceed 0.1% during any 24-hour period. Total frequency deviation, including short time fluctuations and drift, shall not exceed 0.1% from the rated frequency.

  1. Phase-to-Phase Balance

The inverter shall provide a phase-to-phase voltage displacement of no worse than ±3% with a 100% unbalanced load.

  1. Battery Protection

The inverter shall be provided with monitoring and control circuits to protect the battery system from damage due to excessive discharge. Inverter shutdown shall be initiated when the battery voltage has reached the end of discharge voltage. The battery end-of-discharge voltage shall be calculated and automatically adjusted for partial load conditions to allow extended operation without damaging the battery. Automatic shutdown based on discharge time shall not be acceptable.
      1. Inverter Bypass Operation


For times when maintenance is required or when the inverter cannot maintain voltage to the load due to sustained overload or malfunction, a bypass circuit shall be provided to isolate the inverter output from the load and provide a path for power directly from an alternate AC (bypass) source. The UPS control system shall constantly monitor the availability of the inverter bypass circuit to perform a transfer. The bypass circuit shall consist of a continuous duty bypass static switch and an overcurrent protection device to isolate the static bypass switch from the bypass source. The bypass static switch shall denote the solid-state device incorporating SCRs (silicon-controlled rectifiers) that can automatically and instantaneously connect the alternate AC source to the load.

  1. Static Bypass Switch Rating

The static bypass switch shall be rated for continuous duty operation at full rated load for highest reliability without the use of mechanical devices as used with a momentary rated device.

  1. Manual Load Transfers

A manual load transfer between the inverter output and the alternate AC source shall be initiated from the control panel. Manually initiated transfers shall be make-before-break, utilizing the inverter and the bypass static switch.

  1. Automatic Load Transfers

An automatic load transfer between the inverter output and the alternate AC source shall be initiated if an overload condition is sustained for a period in excess of the inverter output capability or due to a malfunction that would affect the output voltage. Transfers caused by overloads shall initiate an automatic retransfer of the load to the inverter only after the load has returned to a level within the rating of the inverter source and the alarm has been acknowledged.

  1. Momentary Overloads

In the event of a load current inrush or branch load circuit fault in excess of the inverter rating, the bypass static switch shall connect the alternate AC source to the load for at least 600 milliseconds, allowing up to 1000% of the normal rated output current to flow. Output voltage shall be sustained to the extent the alternate AC source capacity permits. If the overload condition is removed before the end of the 600-millisecond period, the bypass static switch shall turn Off and the load shall remain on inverter power. If the overload remains, then a transfer to the alternate AC source is to be completed.

  1. Backfeed Protection

As required by UL1778 and CSA, the static transfer switch shall not backfeed UPS power to the bypass distribution system while the UPS is operating on battery during a bypass power outage. The purpose of this requirement is to prevent the risk of electrical shock on the distribution system when the normal source of power is disconnected or has failed. If a shorted SCR is detected, the static transfer switch shall be isolated by an internal automatic circuit breaker and an alarm message shall be annunciated at the UPS control panel. The load shall remain on conditioned and protected power after detection of a shorted SCR and isolation of the bypass static switch.

  1. Active Eco-Mode

When selected, this mode of operation shall transfer the load to the bypass source and maintain it there as long as the bypass source frequency, slew rate and voltage are within the adjusted operating parameters. While in this mode, the inverter shall remain operating to monitor the bypass line to ensure a fast, in-phase transfer of the load to the UPS inverter. Should the bypass source go outside the adjusted limits, the bypass static switch shall turn Off, isolating the load from the bypass while the inverter assumes the full critical load. The load shall be transferred from the bypass source to the inverter while maintaining the output voltage within the ITIC and CBEMA curves.

It shall be possible to control (Activate/ Deactivate) Eco-Mode from the touchscreen HMI, a programmed input contact or both.

The UPS control shall have the capability to suspend Eco-Mode operation when certain conditions exist. A log of the times Eco Mode has been suspended shall be generated and be accessible to the user.
      1. Display and Controls


  1. UPS Control Panel

The UPS shall be provided with a microprocessor-based control panel for operator interface (may also be referred to as User Interface, or UI) to configure and monitor the UPS. The control panel shall be located on the front of the unit where it can be operated without opening the hinged front door. A backlit, menu-driven, full-graphics, color touch screen liquid crystal display shall be used to enter setpoints for the battery test (duration and end voltage), display system information, metering information, a one-line diagram of the UPS and battery, active events, event history, startup instructions and transfer and shutdown screens.

No mechanical push buttons shall be used.

Access to the control and configuration functions shall be protected by a four-digit passcode. After the passcode is keyed in, the user shall be prompted for a confirmation. The passcode shall not be required to access informational screens.

  1. Logic

UPS system logic and control programming shall be resident in a microprocessor-based control system with nonvolatile flash memory. Rectifier, inverter and system control logic shall utilize high-speed digital signal processors (DSPs). CANbus shall be used to communicate between the logic and the User Interface as well as the options. Switches, contacts and relays shall be used only to signal the logic system as to the status of mechanical devices or to signal user control inputs. Customer external signals shall be isolated from the UPS logic by relays or optical isolation.

  1. Metered Values

A microprocessor shall control the display and memory functions of the monitoring system. All three phases of three-phase parameters shall be displayed simultaneously. All voltage and current parameters shall be monitored using true RMS measurements for accuracy to ±1% of voltage, ±3% AC current. The following parameters shall be displayed:

  • Input voltage, line-to-line

  • Input current per phase

  • Input frequency

  • Input apparent power (kVA)

  • Battery voltage

  • Battery charging/discharging current

  • Output voltage, line-to-line

  • Output frequency

  • Bypass input voltage, line-to-line

  • Bypass input frequency

  • Load current

  • Load real power (kW), total and percentage

  • Load apparent power (kVA), total and percentage

  • Load percentage of capacity

  • Battery temperature, each battery string

  • Battery state of charge



  1. Power Flow Indications

A power flow diagram shall graphically depict whether the load is being supplied from the inverter, bypass or battery and shall provide, on the same screen, the status of the following components:

  • AC Input Circuit Breaker (optional)

  • Battery Circuit Breaker, each breaker connection of complete battery complement, complete disconnection and partial connection (one or more, but not all breakers open.)

  • Backfeed Breaker

  • Maintenance Bypass Status

  1. Main Display Screen

The main display screen of the UPS shall be the default screen and shall provide the following information:

  • Operating in Eco-Mode

  • System Status

  • Warning Indicator

  • Fault Indicator

  • Bypass Input Voltage

  • Bypass Input Frequency

  • Input Voltage Line to Line

  • Input Frequency

  • Output Voltage, Line to Line

  • Output Current, Per Phase

  • Output Frequency

  • DC Source Voltage

  • DC Source Current

  1. Touchscreen Control Buttons

Buttons shall be provided to start and stop the inverter. A pop-up message requesting confirmation shall be displayed whenever a command is initiated that would change the status of the UPS.

Other buttons shall be provided to reset faults and silence the alarm buzzer.

  1. Event Log

This menu item shall display the list of events that have occurred recently while the UPS was in operation. The Event Log shall store up to 200 events, with the oldest events being overwritten first if the capacity is reached.

  1. Measures Menu

A “measures menu” shall provide access to the full set of measurements for each functional block (rectifier, bypass, DC-DC converter, batteries, inverter and load).

  1. Battery Status Indicator

A battery status indicator shall display DC alarm conditions, temperature, battery state of charge, the present battery voltage, total discharge time, status of last battery test and battery time remaining during discharge. A graphical representation of the battery voltage during the discharge shall be displayed. The graphical representation shall remain in the monitoring system memory until the next discharge occurs and shall be available for review of the battery performance.

The UPS shall provide the operator with controls to perform the following functions:

  • Configure and manage manual battery test.

  • Modify test duration and minimum voltage

  • Start battery test

  • Monitor test status and progression

  • Stop battery test

  • Battery test status

  1. Alarms

The control panel shall report the system-level alarms listed below. An audible alarm shall be activated when any of the following alarms occurs. All alarms shall be displayed in text form.


Placement into service or test mode

Inverter Off warning

Maintenance Bypass switch closed

Inverter Off pending command

Fan life exceeded

Current limit

Synchronization system fault

kW protection

DIC Power-up

Inverter Off for shutdown command

System shutdown (DIC generated)

Bypass switch open

ID card missing

Bypass line power failure

Calibration started

Bypass wrong phase rotation

Input air high temperature

Bypass disabled for DC voltage low

Input air temp. out of range

Bypass overtemperature warning

SBS output switch open

Low battery time remaining

SBS Bypass switch closed

Battery end of discharge

Do not insert battery switch

High battery temperature

Line power switch open

Battery temp. out of range

SBS output switch closed

Temperature probe not responding

Inverter overtemperature warning

Battery autonomy test

DC undervoltage

High battery temperature

Overload warning

Battery temperature out of range

  1. Controls

System-level control functions shall be:

  • Start Inverter (and transfer to inverter)

  • Stop Inverter (after transferring to bypass)

  • Startup Screen

  • Battery Test Setpoint Adjustment

  • Configure Manual Battery Test

  • Initiate Manual Battery Test

  • Reset (Fault Cleared)

  • System Settings (Time, Date, Language, LCD Brightness, Passcode)

  • Audio Silence Command

  • Alarm Reset Command

  1. Manual Procedures

Load Transfers

Two touch-screen buttons (START INVERTER, STOP INVERTER) shall provide the means for the user to transfer the load to Bypass and back on UPS.
      1. Self-Diagnostics


  1. Event Log File

The control system shall maintain a log of the event conditions that have occurred during system operation. Each log shall contain the event name, event time/date stamp and a set/clear indicator.
      1. Remote Monitoring Capability


  1. Remote Service Delivery

The UPS manufacturer shall provide remote monitoring capability with a user-supplied internet connection for remote diagnostic and monitoring of the UPS system to provide early warning of UPS and single module alarm conditions and out-of-tolerance conditions. This shall allow effective proactive maintenance and fast incident response. First year operation remote monitoring service shall be included.

  1. Communication Cards

The UPS shall be equipped with one bay for an optional communication card.

  • Optional SNMP Web card, providing SNMP, Telnet and Web-management capability, shall be available.

  • Optional Dual Protocol card with choice of any two of the following protocols can be selected

  • SNMP

  • Modbus (over IP or RS-485)

  • BACnet

  • Optional Card for connection to Liebert SiteScan® system only.

  1. Output Alarm Contacts

Dry contact outputs shall be provided for:

  • Summary Alarm

  • Bypass Active

  • Low Battery

  • Operating on generator

  • AC Input Failure, and

  • Two selectable.

  1. Customer Input Contacts

The UPS shall have four discrete input contacts available for the input and display of customer-provided alarm points or to initiate a pre-assigned UPS operation. Each input can be signaled by an isolated external normally open contact.

When an assembly is selected as a pre-assigned UPS operation, the following actions shall be initiated:

  • On Generator—Provides selectable choices to enable or disable battery charging, and enable or disable Eco-Mode operation while on generator.

  • Transfer to Bypass—Manual command to transfer from inverter operation to static bypass operation.

  • Fast Power Off—Emergency Module Off (EPO) command to stop UPS operation.

  • Start Battery Test—Manually initiate an automated battery test operation.

  • Stop Battery Test—Manually stop an automated battery test operation.

  • Acknowledge Fault—Acknowledge a UPS alarm condition and present faults will be reset.

  • Bypass/Inverter Off—Emergency Power Off (EPO) command to stop UPS operation.

  • External Maintenance Bypass Breaker (MBB) status (open or closed)


      1. Battery Disconnect Breaker


The UPS shall have a properly rated circuit breaker (600VDC) to isolate it from the base module. This breaker shall be in a separate NEMA-1 enclosure or in a matching battery cabinet. When open, there shall be no battery voltage in the UPS enclosure. The UPS shall be automatically disconnected from the battery by opening the breaker when the battery reaches the minimum discharge voltage level or when signaled by other control functions.
      1. Battery Plant


The battery plant shall comply with the specifications of:

  1. Matching battery power pack,

  1. Flooded-cell battery system on rack, or

  2. Valve-regulated, sealed cell battery system on rack.

  1. Matching Battery Power Pack (VRLA Battery)

The battery power pack shall consist of sealed, valve-regulated batteries and a properly rated circuit breaker (500VDC nominal, 600VDC maximum) for isolating the battery pack from the UPS. The battery cells and disconnect breaker shall be installed and housed in a NEMA-1 cabinet, matching the UPS style and design.

The battery system shall be sized to support a _____kW load for _____ minutes. The battery system shall provide 100% initial capacity upon delivery.

The battery shall be lead-calcium, sealed, valve-regulated type with a 3-year full warranty and a 7-year pro rata warranty under full float operation. The battery design shall utilize absorbent glass mat (AGM) technology to immobilize the electrolyte.

  1. Flooded-Cell Battery System on Rack

The battery shall be a lead-calcium stationary battery with a 20-year pro rata warranty under full float operation.

Ratings

Backup time: ____ minutes

Load kW: ____kW

Maximum Specific Gravity: _____

Racks shall be ____-tier, certified for a seismic rating of _________.

Alloys

Grids shall be manufactured of lead-calcium alloys to ensure long life and consistently low gassing rate over the entire service life; all internal wetted parts shall be of similar non-antimonial alloy to preclude interfacial corrosion at the bonded area.

Plates

Both positive and negative plates shall be of the flat pasted plate design to ensure highly reliable electrical performance throughout the life of the battery. Positive plates shall be at least 0.16 in. (0.4cm) thick. Physical support of the positive plate group shall be via a suspension system that allows for normal plate expansion without stressing the jar or cover.

Terminals

All batteries larger than 1.5 kW/cell (15-minute rate to 1.67 volts per cell) shall include copper inserted terminal posts allowing connector torque of 160 pound inches and copper-to-copper interface with the intercell connector (except for flashing). Terminal posts shall be of sufficient strength to support normal inter-tier or inter-step cabling without additional bracing.

Container

The cell cover shall be of a flame-retardant material with an oxygen index of at least 28; all jars shall be transparent to allow visual inspection of the plates and sediment spaces. Cell covers shall include provision for sampling of the electrolyte below the tops of the plates.

Intercell Connections

For each bolted connection, lead-plated copper connectors and corrosion-resistant bolts shall be provided; interconnecting hardware shall be sized so as to permit discharge at the maximum published rate while allowing no more than 30 mV of voltage drop between adjacent units at the one-minute rate to 1.75 volts per cell (VPC). Along with the necessary hardware, the supplier shall furnish NO-OX-ID grease to coat the contact area of all electrical connections.

Racks

Racks shall have welded steel support frames and unitized rail construction to prevent long-term warpage and resultant stresses on the cells and interconnections. All metallic rack components that directly contact the battery shall be insulated by removable covers.

Packaging

The battery jar design shall allow lifting straps to be inserted beneath the cells without moving, lifting or tilting the cells. Packaging shall ensure that plates are perpendicular to the normal direction of travel during transportation.

Manufacturing Controls

Each cell shall be clearly identified as to cell type, voltage and capacity as well as manufacturing control group for future quality assurance traceability. All cells in the battery shall be tested to verify 100% system capacity. The equipment shall be designed and manufactured under a quality assurance program that is controlled and documented by written policies, procedures or instructions and which shall be carried out throughout the performance of the work. The quality assurance program shall conform to the requirements of ANSI N45.2, MIL I-45208A and MIL-Q-9858

  1. Valve-Regulated, Sealed Cell Battery System on Rack

The battery shall be a lead-calcium, sealed, reduced-maintenance type with a one-year full warranty and a 9‑year pro rata warranty under full float operation.

Ratings

Backup time: ____ minutes

Load kW: ____kW

Maximum Specific Gravity: _____

Racks shall be ____-tier, certified for a seismic rating of _________.

Electrolyte Immobilization

The battery shall utilize absorbent glass mat (AGM) technology to immobilize electrolyte.

Alloys

Grids shall be manufactured of lead-calcium alloys to assure long life and consistently low gassing rate over the entire service life; all internal wetted parts shall be of similar non-antimonial alloy to preclude interfacial corrosion at the bonded area.Plates

Both positive and negative plates shall be of the flat pasted plate design to ensure highly reliable electrical performance throughout the life of the battery. Positive plates shall be equipped with fibrous retention mats to inhibit the loss of active material as a result of repeated cycling.

Terminals

All batteries shall include copper inserted terminal posts allowing connector torque of 110 pound inches and copper-to-copper interface with the intercell connector (except for flashing). Terminal posts shall be of sufficient strength to support normal inter-tier or inter-step cabling without additional bracing.

Container

The cell container and cover shall be of a flame-retardant material with an oxygen index of at least 28. The cell cover shall include a low-pressure release vent. All cells larger than .25 kW/cell (15 minute rate to 1.67 volts per cell) shall include an integral flash arrestor.

Intercell Connections

For each bolted connection, tin-plated copper connectors and corrosion-resistant bolts shall be provided; interconnecting hardware shall be sized so as to permit discharge at the maximum published rate while allowing no more than 30 mV of voltage drop between adjacent units at the one-minute rate to 1.75 volts per cell (VPC). Along with the necessary hardware, the supplier shall furnish terminal connection coating compound if required by the battery manufacturer.

Manufacturing Controls

Each cell shall be clearly identified as to cell type, voltage and capacity as well as manufacturing control group for future quality assurance traceability. All cells in the battery shall be tested to verify 100% system capacity. The equipment shall be designed and manufactured under a quality assurance program that is controlled and documented by written policies, procedures or instructions and that shall be carried out throughout the performance of the work. The quality assurance program shall conform to the requirements of ANSI N45.2, MIL I-45208A and MIL-Q-9858.
      1. Optional Accessories


  1. AC Input Circuit Breaker

The rectifier shall have as an option an internal AC input circuit breaker. The circuit breaker shall be of the frame size and trip rating to supply full rated load and recharge the battery at the same time. The circuit breaker shall have an undervoltage release to open automatically if the control voltage is lost.

  1. Remote Alarm Panel

The remote alarm panel shall have LED alarm lights. An audible alarm shall sound upon any alarm condition. The surface-mounted NEMA 1 enclosed panel shall indicate:

  • Load on UPS

  • Load on Bypass

  • Battery Discharging

  • Low Battery Warning

  • Overload

  • Audible Alarm with Reset

  1. Load Bus Sync Controller

The Load Bus Sync Controller shall enable two independent single-module UPS units to stay in sync when operating on battery or unsynchronized input sources. The LBS Controller shall determine the master and slave relationship between UPS units. An LBS Controller shall be installed within each single-module UPS.

  1. Dual Protocol Web Card

A Web card shall be provided to deliver SNMP, SMS Text Messaging, Telnet and Web-based management capability for enhanced communication as well as a choice of any two of the following protocols:

  • SNMP

  • Modbus over IP or RS-485

  • BACnet

  1. Seismic Anchorage Kits

Seismic anchorage kits shall be provided with the UPS unit, and, if included, the optional battery cabinet, for use in seismic restraint as required for IBC 2012 certification.

  1. Scalable Output Capacity

UPS rated output capacity of certain models shall be scalable by means of a software upgrade available for purchase from the manufacturer which will require no hardware modifications to the UPS. Models shall be available in capacity ranges of 225, 250, 400 and 500kVA.

  • 225kVA and 250kVA models shall be scalable to 300kVA.

  • 400kVA model shall be scalable from 400kVA to 500kVA to 600kVA.

  • 500kVA model shall be scalable to 600kVA.
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