User's Manual
`SYMINIF
`SYMINIF-PD
`SYMSTRF
`SYMSTRF-PD
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`IPR Page 1
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`Raritan v. Server Technology
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`RARITAN EXHIBIT 1028
`
`

`
`
`Important Safety Instructions!Important Safety Instructions!
`Important Safety Instructions!
`
`Important Safety Instructions!Important Safety Instructions!
`
`Please read this manual!
`Veuillez lire ce manuel!
`Bitte lesen Sie dieses Anleitungshandbuch!
`¡Se ruega leer este manual de instrucciones!
`
`This User's Manual provides safety, installation and operating instructions that will help you derive the fullest performance and
`service life that the SymmetraTM Power Array has to offer.
`
`PLEASE SAVE THIS USER'S MANUAL! It includes important instructions for the safe use of the SymmetraTM Power Array, and
`for obtaining factory service should the proper operation of the system or the components come into question. Service or storage
`issues may arise at a later date, and may require reference to this User's Manual, or to the technical support information that is
`included in it.
`
`CONSERVER CES INSTRUCTIONS! Cette notice contient des instructions importantes concernant la sécurité.
`
`Radio Frequency Interference
`
`NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to Part 15 of the
`FCC Rules and the Class A limits for radio noise emissions from digital apparatus set out in the Radio Interference Regulations of
`the Canadian Department of Communications. These limits are designed to provide reasonable protection against harmful
`interference when the equipment is operated in a commercial environment. This equipment generates, uses and can radiate radio
`frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful interference to
`radio communications. Operation of this equipment in a residential area is likely to cause harmful interference in which case the
`user will be required to correct the interference at his own expense.
`
`Shielded cables must be used with this unit to ensure compliance with the Class A FCC limits.
`
`WARNING: Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the
`user’s authority to operate the equipment.
`
`Part #: 990-7770A
`
`Revised 10/97
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`

`
`Limited Warranty
`
`American Power Conversion (APC) warrants its products to be free from defects in materials and workmanship for a period of
`two years from the date of purchase. Its obligation under this warranty is limited to repairing or replacing, at its own sole option,
`any such defective products. To obtain service under warranty you must obtain a Returned Material Authorization (RMA)
`number from APC or an APC service center. Products must be returned to APC or an APC service center with transportation
`charges prepaid and must be accompanied by a brief description of the problem encountered and proof of date and place of
`purchase. This warranty does not apply to equipment which has been damaged by accident, negligence, or mis-application or has
`been altered or modified in any way. This warranty applies only to the original purchaser who must have properly registered the
`product within 10 days of purchase.
`
`EXCEPT AS PROVIDED HEREIN, AMERICAN POWER CONVERSION MAKES NO WARRANTIES, EXPRESS OR IMPLIED,
`INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Some states do not
`permit limitation or exclusion of implied warranties; therefore, the aforesaid limitation(s) or exclusion(s) may not apply to the
`purchaser.
`
`EXCEPT AS PROVIDED ABOVE, IN NO EVENT WILL APC BE LIABLE FOR DIRECT, INDIRECT, SPECIAL, INCIDENTAL,
`OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OF THIS PRODUCT, EVEN IF ADVISED OF THE POSSI-
`BILITY OF SUCH DAMAGE. Specifically, APC is not liable for any costs, such as lost profits or revenue, loss of equipment, loss
`of use of equipment, loss of software, loss of data, costs of substitutes, claims by third parties, or otherwise. This warranty gives
`you specific legal rights and you may also have other rights which vary from state to state.
`
`Life Support Policy
`
`As a general policy, American Power Conversion (APC) does not recommend the use of any of its products in life support appli-
`cations where failure or malfunction of the APC product can be reasonably expected to cause failure of the life support device or
`to significantly affect its safety or effectiveness. APC does not recommend the use of any of its products in direct patient care.
`APC will not knowingly sell its products for use in such applications unless it receives in writing assurances satisfactory to APC
`that (a) the risks of injury or damage have been minimized, (b) the customer assumes all such risks, and (c) the liability of
`American Power Conversion is adequately protected under the circumstances.
`
`Examples of devices considered to be life support devices are neonatal oxygen analyzers, nerve stimulators (whether used for
`anesthesia, pain relief, or other purposes), autotransfusion devices, blood pumps, defibrillators, arrhythmia detectors and alarms,
`pacemakers, hemodialysis systems, peritoneal dialysis systems, neonatal ventilator incubators, ventilators for both adults and
`infants, anesthesia ventilators, infusion pumps, and any other device designated as “critical” by the U.S.F.D.A.
`
`Hospital grade wiring devices and leakage current may be ordered as options on many APC UPS systems. APC does not claim that
`units with this modification are certified or listed as Hospital Grade by APC or any other organization. Therefore these units do
`not meet the requirements for use in direct patient care.
`
`Entire contents copyright © 1997 American Power Conversion. All rights reserved; reproduction in whole or in part without
`permission is prohibited. Symmetra, Power Array, SmartSlot, SmartCell and SNMP Adapter are trademarks of APC. Power-
`Chute and PowerDoctor are registered trademarks of APC. All other trademarks are the property of their respective owners.
`
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`

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`Table of Contents
`
`INTRODUCTION
`Theory of Operation ................................................................................................................. i
`Modes of Operation .................................................................................................................. iii
`
`SAFETY INFORMATION
`Symbols Used In This Manual ......................................................................................... safety-1
`Important Safety Instructions .......................................................................................... safety-1
`
`1. PHYSICAL REPRESENTATION
`The Power Array Frame ............................................................................................................ 1-1
`PowerView User Interface ......................................................................................................... 1-2
`Louvered Cover Grills ............................................................................................................... 1-2
`Power Modules .......................................................................................................................... 1-2
`Battery Module .......................................................................................................................... 1-2
`Main Intelligence Module (MIM) ........................................................................................... 1-3
`Redundant Intelligence Module (RIM) ................................................................................... 1-3
`Input Circuit Breaker ................................................................................................................ 1-3
`Maintenance Bypass Switch ..................................................................................................... 1-3
`Rear View of Power Array ......................................................................................................... 1-4
`System Enable Switch ................................................................................................................ 1-4
`Communication Interface Ports .............................................................................................. 1-4
`SmartSlot Accessory Ports ........................................................................................................ 1-4
`REPO/Input/Output Wiring Panels ........................................................................................ 1-4
`Power Distribution Unit Panel ................................................................................................. 1-4
`Battery Extension Frame Connector ....................................................................................... 1-4
`
`2. SITE PREPARATION
`Space and Weight Considerations ........................................................................................... 2-1
`Transporting Power Array to Installation Site ........................................................................ 2-1
`Operating Conditions ............................................................................................................... 2-1
`BTU Output ............................................................................................................................... 2-1
`
`3. UNPACKING AND INSTALLING FRAME
`Initial Inspection ....................................................................................................................... 3-1
`Check For Damage .................................................................................................................... 3-1
`Handling Considerations ......................................................................................................... 3-1
`Tools Required For Setup ......................................................................................................... 3-1
`Storage of Battery and Power Modules ................................................................................... 3-1
`Moving the Frame ..................................................................................................................... 3-1
`Removing Packing Materials .................................................................................................... 3-2
`Remove the Frame from the Pallet .......................................................................................... 3-2
`Moving Battery & Power Modules .......................................................................................... 3-2
`Clean-Up .................................................................................................................................... 3-2
`
`4. WIRING REQUIRMENTS & PROCEDURES
`Wiring Overview ....................................................................................................................... 4-1
`Input Wiring .............................................................................................................................. 4-2
`Output Wiring ........................................................................................................................... 4-4
`Remote Emergency Power Off Wiring .................................................................................... 4-7
`Electrical Wiring Test/Checklist ............................................................................................... 4-8
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`5. SETTING UP THE POWER ARRAY
`Overview of Setup ..................................................................................................................... 5-1
`Frame Leveling Procedure ........................................................................................................ 5-1
`Installing Battery Modules ....................................................................................................... 5-2
`Installing Power Modules ......................................................................................................... 5-3
`Installing the Main Intelligence Module (MIM) .................................................................... 5-4
`Installing the Redundant Intelligence Module (RIM) ........................................................... 5-4
`Installing the PowerView Interface .......................................................................................... 5-5
`SmartSlot Interface Accessories ............................................................................................... 5-6
`Installation Test/Checklist ........................................................................................................ 5-7
`
`6. THE POWERVIEW DISPLAY
`Overview .................................................................................................................................... 6-1
`PowerView Functions ............................................................................................................... 6-1
`PowerView LED's ...................................................................................................................... 6-2
`Navigation Keys ......................................................................................................................... 6-2
`Startup Screen ............................................................................................................................ 6-3
`Top level Menu Screen .............................................................................................................. 6-3
`
`7. CONFIGURING & OPERATING THE SYMMETRA
`Introduction .............................................................................................................................. 7-1
`Powering the System ................................................................................................................. 7-1
`Powering the Loads ................................................................................................................... 7-2
`Review Status Conditions ......................................................................................................... 7-2
`Perform a Self-Test .................................................................................................................... 7-4
`Shutdown Parameters ............................................................................................................... 7-5
`Configure Alarms ...................................................................................................................... 7-5
`Review Diagnostics Menu ........................................................................................................ 7-6
`Review Logging Menu ............................................................................................................... 7-6
`
`8. MODULE REPLACEMENT
`Module Failure Alarm Indicators .......................................................................................... 8-1
`Technical Support and Obtaining a Replacement Module .................................................. 8-1
`Battery Module Replacement Procedure ............................................................................... 8-2
`Power Module Replacement Procedure ................................................................................ 8-3
`Main Intelligence Module Replacement Procedure ............................................................. 8-4
`Redundant Intelligence Module Replacement Procedure ................................................... 8-4
`
`9. POWERVIEW DISPLAY MESSAGES
`Start-Up Messages ................................................................................................................... 9-1
`General Status Messages ......................................................................................................... 9-2
`Module Failure Messages ........................................................................................................ 9-3
`Threshold Alarm Messages ..................................................................................................... 9-3
`Bypass Messages ...................................................................................................................... 9-3
`General Fault Messages ........................................................................................................... 9-4
`
`INDEX
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`

`
`Introduction
`
`The APC SymmetraTM Power Array is a
`scalable, redundant power protection sys-
`tem for multiple servers and business
`critical applications. This is an introduction
`to the SymmetraTM Power Array.
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`

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`Thank You!
`
`Theory of Operation
`
`The SymmetraTM Power Array is comprised of three func-
`tional components: A power processing system, a battery
`source, and a control/user interface system. Output power is
`routed through a transformer prior to delivery to the load
`equipment. See figure I-2. Each of the functional components
`and the transformer are described in the following text.
`
`Thank you for investing in the SymmetraTM Power Array. Please
`read this User's Manual thoroughly prior to installing the sys-
`tem. It provides important information about installing and
`using the SymmetraTM safely and effectively.
`
`SymmetraTM Overview
`
`The SymmetraTM is a high-performance, uninterruptible
`power “array” system, designed for large-scale loads. It pro-
`vides conditioned, reliable AC power to load equipment, and
`provides protection from power blackouts, brownouts, swells,
`sags, surges and interference. The SymmetraTM Power Array
`system is comprised of either a MiniFrame, or a MasterFrame,
`and a variable set of modules. A MiniFrame system can be
`configured to deliver a maximum output of 8kVA, and a
`MasterFrame system, a maximum of 16kVA.
`
`Fig I-1 MiniFrame and MasterFrame
`
`Fig I-2 Functional Diagram of a SymmetraTM
`
`i
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`

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`Power Processing System
`
`Control/User Interface
`
`The power processing system delivers conditioned AC output
`power with a low distortion sinewave. Under normal operat-
`ing conditions, power is received from the AC utility power
`source, conditioned by the power processing system, and de-
`livered to the load equipment. In the event of an AC utility
`source failure, the power processing system receives power
`from the battery source (battery modules), converts it to con-
`ditioned AC, and delivers it to the load equipment. When AC
`utility power is present, the power processing system also
`maintains the battery source at full charge.
`The power processing system in SymmetraTM is comprised of
`individual power module(s). Each power module contains
`the electronics for a complete 4kVA UPS, including the rectifier,
`charger and inverter. When two or more power modules are
`present, they operate in parallel, sharing the load equally.
`By configuring the system with at least one more power mod-
`ule than is required to power the load (a redundant power
`module), SymmetraTM can sustain a power module failure,
`and still deliver full power to the load equipment. The failed
`module is identified by the control/user interface system, an
`alarm is initiated to notify the user of the module failure, and
`the hot-swappable module can be replaced by the user, with-
`out the need to power down the load equipment.
`A SymmetraTM MiniFrame provides bays for up to three power
`modules, and a MasterFrame provides bays for up to five.
`This provides the full system capacity (8kVA and 16kVA re-
`spectively), plus one redundant power module.
`
`Battery Source
`
`The battery source is comprised of parallel, hot-swappable,
`120V battery modules. These are housed in the SymmetraTM
`frame, and in an optional extension battery frame.
`A SymmetraTM MiniFrame provides bays for up to two bat-
`tery modules, and a MasterFrame provides bays for up to
`four. Both of these frames can be connected to an extension
`battery frame. Additional battery modules increase on-bat-
`tery run time.
`
`ii
`
`The control/user interface system coordinates the operation
`of the SymmetraTM and reports status conditions via several
`user interface options. Functions performed by the control/
`user interface component include module coordination and
`state control, analysis and reporting of system status, and
`reporting of alarm conditions.
`Module Coordination & State Control - The SymmetraTM
`incorporates a main intelligence module (MIM) that continu-
`ously monitors the system, and delivers data to both the
`PowerView user interface, and to the communication ports.
`The MIM coordinates the initial power up of the system, trans-
`fers it into and out of bypass mode, transfers the power source
`between the utility AC power, and the battery source, and co-
`ordinates shutdown operations.
`System Status Monitoring - The MIM gathers data about the
`system components, and delivers it to both the PowerView
`interface, and to the computer interface ports. System status
`monitoring and reporting data include the current predicted
`run time, the status of individual battery modules and power
`modules, input & output voltage, input & output voltage fre-
`quency, and the size and status of the current output load.
`Alarm Condition Detection - The control/user interface sys-
`tem monitors the SymmetraTM for alarm conditions. If an
`alarm condition is detected, the PowerView user interface ini-
`tiates an audible and visual alarm. Alarm conditions include
`on-battery, low battery, module faults, overloads, loss of re-
`dundancy and a variety of other default and user defined events.
`All possible alarm messages and the appropriate user responses
`are provided in chapter 10.
`
`Transformer
`
`The power processing system receives either 208V or 240V
`input AC utility power, and delivers 240V power to an internal
`transformer. The transformer delivers multiple output volt-
`ages (120V/208V/240V) to an output wiring terminal block
`inside the SymmetraTM frame. Output wiring procedures are
`provided in chapter 4.
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`

`
`Modes of Operation
`
`The Power Array functions in one of four modes of operation,
`depending on user commands, the status of the AC utility
`voltage, and the condition of the SymmetraTM itself. The four
`modes are Load-Disconnect, On-Line, On-Battery, and By-
`pass. The PowerView interface reports the operating mode.
`
`Load-Disconnect Mode
`In the load-disconnect mode, incoming AC utility power is
`present and the system is internally powered, but no output
`power is delivered to the load equipment. The SymmetraTM
`enters the load-disconnect mode at the initial power up, when
`the system enable switch is switched to the “on” position. When
`the system is operating on-line, and the “load off ” command
`is entered in the PowerView interface, it returns to the load-
`disconnect mode. Figure I-3 illustrates the power flow when
`the system is operating in the load-disconnect mode.
`
`On-Line Operating Mode
`The on-line operating mode is the “normal” operating mode.
`When the system is in the on-line operating mode, the Power
`Array receives power from the AC utility, and delivers condi-
`tioned power to the load equipment. The Power Array main-
`tains proper battery charge, regulates the output voltage and
`frequency, and protects the load from surges and electrical
`noise. SymmetraTM will operate in this mode if it has been
`commanded to turn the load on, the incoming utility voltage
`is present and functioning properly, and there are no prevent-
`ing abnormal conditions, such as an overload. See figure I-4
`for a diagram of the power flow when the system is in the on-
`line operating mode.
`
`Fig I-3 Load-Disconnect Operating Mode
`
`Fig I-4 On-Line Operating Mode
`
`iii
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`

`
`On-Battery Operating Mode
`When in the on-battery mode, the Power Array draws DC
`power from the battery source, converts it to conditioned AC
`power that is then delivered to the load equipment.
`SymmetraTM typically enters this mode in the event of a utility
`power failure. It will also operate in the on-battery mode
`during a user initiated battery self test.
`
`On-battery operation is limited in duration and is dependent
`upon the number of battery modules, their state of charge,
`and the size of the load. SymmetraTM will remain in the on-
`battery state until either the incoming utility power is restored,
`or the batteries are depleted. See figure I-5 for a diagram of the
`power flow when the system is in the on-battery mode.
`
`Bypass Operating Mode
`When the SymmetraTM is in the bypass operating mode, the
`system is bypassed, and utility power is delivered directly to
`the load. SymmetraTM is equipped with an automatic bypass
`function to allow the system to automatically go into bypass
`mode, and a manual maintenance bypass switch to allow a
`user to manually bypass the system. Either can be used to
`place the Power Array into bypass operating mode.
`
`The SymmetraTM will automatically transfer to the bypass
`operating mode when AC utility power is present, but the load
`cannot be powered by the inverter. Events which may cause
`this include overloads, or failed non-redundant power mod-
`ules. The SymmetraTM will automatically return to the on-line
`mode when the triggering event clears. Figure I-6 illustrates
`the power flow when the system is in the bypass mode.
`
`Fig I-5 On-Battery Operating Mode
`
`Fig I-6 Bypass Operating Mode
`
`iv
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`

`
`Definitions
`
`Important Information
`
`The following definitions are used in this manual and will be
`helpful in understanding SymmetraTM.
`
`Redundancy - Indicates the presence of one or more extra
`modules, allowing the system to sustain a fault and continue
`to provide full protection to the load. To be fully redundant,
`the system should be configured with a redundant intelligence
`module, and at least one redundant power module.
`Note: The number of battery modules determines the length of
`the run time. While it is prudent to use the maximum number
`of battery modules possible, they are not considered redundant.
`
`N+1 Redundancy - Refers to the level of redundancy, specifi-
`cally related to power modules. “N” represents the number of
`modules required to power the load, and “+1, +2, etc.” repre-
`sents the number of extra power modules that are present.
`For example, a 7.3 kVA load requires two power modules for
`adequate protection. If the SymmetraTM is configured with
`only two modules, it has an “N+0,” level of redundancy. (No
`redundancy). If the system is configured with three power
`modules, it has an “N+1” redundancy. Depending on the size
`of the load, SymmetraTM can be configured with 2, 3 or even 4
`extra power modules. Respectively, it would have an N+2,
`N+3, or N+4 level of redundancy.
`
`Capacity - The maximum amount of output power that a
`SymmetraTM system can deliver. The capacity is limited by the
`lesser of the frame size, or the capacity of the installed power
`modules.
`For example, a MiniFrame (8kVA) with one power module
`installed (4kVA) has a system capacity of 4kVA. A MasterFrame
`(16kVA) with five power modules (20kVA) has a system ca-
`pacity of 16kVA.
`
`Hot-swappable - The modules are “hot-swappable” means
`they can be replaced safely by a user or service provider while
`the load is still powered and fully protected.
`
`Please read this User's Manual thoroughly, before proceeding
`with the installation of the SymmetraTM Power Array system.
`It provides important information about installing and using
`the SymmetraTM safely and effectively. Pay close attention to
`text that is accompanied by a danger, or caution symbol. For
`technical support, contact APC at:
`
`1-888-809-TECH
`
`v
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`IPR Page 11
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`

`
`Safety Information
`
`Important Safety Information
`
`Read this safety information in its entirety,
`before proceeding with the installation &
`operation of the SymmetraTM Power Array.
`
`IPR Page 12
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`

`
`Symbols Used In This Manual
`
`IMPORTANT SAFETY INSTRUCTIONS
`
`Safety
`
`The following symbols appear in this User's Manual:
`
`CAUTION/DANGER - Caution indicates risk of
`bodily harm. Danger indicates that a risk of elec-
`trical shock is present and the associated proce-
`dures should be followed carefully.
`
`“STAND BY MODE” - The system enable switch,
`and the input circuit breaker use the “stand by”
`mode. When either of these are switched to “stand
`by,” the Power Array is disconnected from utility
`input voltage. In this mode, the system appears to
`be off, although the utility power is still connected
`to the system. For this reason, the standby mode
`is unsafe for servicing the system. Always follow the
`five step Total Power Off procedure before servic-
`ing the Power Array. (See procedure at right.)
`
` “OFF POSITION” - The maintenance bypass
`switch is the only switch that can be placed in the
`“off ” position. When switched to the “off ” posi-
`tion, the Power Array functions normally, receiv-
`ing power from the utility source, and delivering
`conditioned power to the load equipment.
`
` “ON POSITION” - All three switches (The sys-
`tem enable switch, the maintenance bypass switch
`and the input circuit breaker) can be placed in the
`“on” position. See the description for each of these
`switches in chapter 1.
`
`SAFETY EARTH GROUND - Indicates the pri-
`mary safety ground.
`
`n SAVE THESE INSTRUCTIONS - This manual contains
`important instructions that should be followed during
`installation and maintenance of the Power Array, and for
`installation or replacement of the battery and power mod-
`ules.
` CONSERVER CES INSTRUCTIONS. CETTE NOTICE
`CONTIENT DES INSTUCTIONS IMPORTANTES
` CONCERNANT LA SÉCURITÉ.
`
`n Connection to the branch circuit (mains) must be per-
`formed by a licensed electician.
`
`n Installation of the power and battery modules can be per-
`formed by any individual with no previous technical ex-
`perience.
`
`n Operation of the equipment can be performed by any
`individual with no previous technical experience.
`
`n The protective earth conductor for the SymmetraTM car-
`ries the leakage current from the load devices (computer
`equipment). Therefore, the size of the conductor must be
`at least as large as the wire required by IEC 950. IEC 950
`states the following nominal cross-sectional areas:
`- 2.5 mm2 for rated current between 17 & 25 A
`- 6 mm2 for rated current between 33 & 40 A
`- 10 mm2 for rated current between 41 & 63 A
`- 16 mm2 for rated current between 64 & 80 A
`
`n FIVE STEP TOTAL POWER OFF PROCEDURE
`To remove all power from the Power Array (Total Power
`Off), the following series of events must occur in the or-
`der listed:
`1. Set system enable switch to the “stand by” position.
`2. Set input circuit breaker to the “stand by” position.
`3. Remove all battery modules from the Power Array.
`4. Disconnect external battery cabinet (if present).
`5. Disconnect the mains/branch circuit breaker.
`
`Safety-1
`
`IPR Page 13
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`

`
`Safety
`
`n CAUTION: Risk of Electrical Shock and Energy Hazard,
`120V, 7.2 Ah battery module. Before replacing battery
`modules, remove conductive jewelry such as chains, wrist
`watches and rings. High short circuit current through
`conductive materials could cause severe burns.
`
`n CAUTION: Do not dispose of batteries or battery mod-
`ules in a fire. The batteries may explode.
`
`n CAUTION: Do not open or mutilate battery modules or
`batteries. Released electrolyte is harmful to the skin and
`eyes. It may be toxic.
`
`n While battery modules are user replaceable, servicing of
`the battery modules themselves should be performed or
`supervised by personnel knowledgeable of batteries and
`the required precautions. Keep unauthorized personnel
`away from batteries.
`
`n When replacing or adding battery modules to the Power
`Array system, use only the “SYBATT SymmetraTM Bat-
`tery Module.” Contact APC for technical support, for
`additional, or for replacement battery modules at:
`
`1-888-809-TECH
`
`Safety-2
`
`IPR Page 14
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`

`
`Chapter One
`Physical Representation
`
`This chapter provides an illustrated descrip-
`tion of the SymmetraTM Power Array sys-
`tem, and each of the modular components.
`Before proceeding, examine the illustration
`below. It depicts a MasterFrame (16kVA)
`Power Array as it appears during normal
`operating conditions. The grill covers are
`correctly installed, and the Powerview
`Interface is mounted on the frame.
`
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`

`
`The Power Array Frame
`
`The SymmetraTM Power Array frame serves as the base for the
`modular components of the system. The MiniFrame pro-
`vides bays for three power modules, and two battery mod-
`ules. The MasterFrame provides bays for five power mod-
`ules, and four battery modules. Both frames provide one bay
`at the top right that houses the main intelligence module (MIM)
`and redundant intelligence module (RIM).
`The bottom of both frames contain wiring input/output ac-
`cess panels and terminal blocks. A system enable switch, input
`circuit breaker and maintenance bypass switch