Eaton 9315 User manual

Powerware 9315 UPS
200–300 kVA
Operation Manual
®

IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that you should follow during installation and
maintenance of the UPS and batteries. Please read all instructions before operating the
equipment and save this manual for future reference.
Consignes de sécurité
CONSIGNES DE SÉCURITÉ IMPORTANTES
CONSERVER CES INSTRUCTIONS
CE MANUEL CONTIENT DES CONSIGNES DE SÉCURITÉ IMPORTANTES
ClassAEMCStatements
FCC Part 15
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. 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.
WARNING
This is a product for restricted sales distribution to informed partners. Installation
restrictions or additional measures may be needed to prevent disturbances.
Powerware and X-Slot are registered trademarks and ConnectUPS is a trademark of Eaton Electrical
Inc. Modbus is a registered trademark of Modicon.
ECopyright 2004-2006 Eaton Corporation, Raleigh, NC, USA. All rights reserved. No part of this
document may be reproduced in any way without the express written approval of Eaton Corporation.

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EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
Table of Contents
1Introduction 1-1............................................................
1.1 Conventions Used in This Manual 1-1............................................
1.2 For More Information 1-2......................................................
1.3 Getting Help 1-2..............................................................
2 Getting Started 2-1.........................................................
2.1 Safety Warnings 2-1...........................................................
2.2 Typical Powerware 9315 UPS System 2-2.........................................
2.3 Looking Inside the UPS 2-3.....................................................
2.4 UPS Standard Features 2-4.....................................................
2.4.1 Monitor Panel 2-4.........................................................
2.4.2 Control Panel 2-4.........................................................
2.4.3 Communication Bays 2-4...................................................
2.4.4 Input Filter 2-4............................................................
2.4.5 Emergency Load Off 2-5....................................................
2.4.6 Automatic Battery Charge Current Limit 2-5...................................
2.4.7 Installation Features 2-5....................................................
2.5 Options and Accessories 2-5....................................................
2.5.1 Battery 2-5...............................................................
2.5.2 External Battery Disconnect 2-5.............................................
2.5.3 Power Distribution Module (LV models only) 2-6...............................
2.5.4 Upgrade Capability 2-6.....................................................
2.5.5 Remote Monitor Panel 2-6..................................................
2.5.6 Relay Interface Module 2-6.................................................
2.5.7 Input Isolation Transformer 2-6..............................................
2.5.8 5% Input Filter 2-6.........................................................
2.5.9 Output Transformer 2-7....................................................
2.5.10 Modem 2-7..............................................................
2.5.11 Customer Convenience Outlet 2-7...........................................
2.6 Symbols, Controls, and Indicators 2-8............................................
3 Understanding UPS Operation 3-1...........................................
3.1 Normal Mode 3-1.............................................................
3.2 Bypass Mode 3-3.............................................................
3.3 Battery Mode 3-4.............................................................
3.4 Monitoring and Controlling UPS Operation 3-5....................................

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ii EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
4 Starting and Stopping the UPS 4-1...........................................
4.1 Using the Control Panel 4-1....................................................
4.1.1 To Place the UPS in Normal Mode 4-2........................................
4.1.2 To Shut Down the UPS from Normal Mode 4-3................................
4.1.3 To Start the UPS in Bypass Mode 4-3.........................................
4.1.4 To Shut Down Power to the Critical Load While in Bypass Mode 4-3...............
5 Using the Monitor Panel 5-1.................................................
5.1 Using the LCD Screen 5-2......................................................
5.2 Using the Buttons 5-3.........................................................
5.3 Adjusting the Contrast 5-3.....................................................
5.4 Using the Load Off Button 5-3..................................................
5.5 Reading the Status Indicators 5-4................................................
5.6 Using the Menu Options 5-4....................................................
6 Using Features and Options 6-1..............................................
6.1 Building Alarm Monitoring 6-1..................................................
6.2 Summary Alarm Contacts 6-2...................................................
6.3 Remote Monitor Panel 6-3.....................................................
6.4 Battery Cabinets 6-5...........................................................
6.5 External Battery Disconnect 6-5.................................................
6.6 Relay Interface Module 6-6.....................................................
6.7 Supervisory Contact Module 6-7................................................
7 Communication 7-1.........................................................
7.1 Locating the Communication Bays 7-1...........................................
7.2 X-Slot Cards 7-2..............................................................
7.3 LanSafe Power Management Software 7-3........................................
7.4 Connecting Equipment to a Serial Port 7-3........................................
7.5 Configuring the Serial Ports 7-6.................................................
7.5.1 Mode 7-7................................................................
7.5.2 Rate 7-7.................................................................
7.5.3 Data/Stop 7-8.............................................................
7.5.4 Handshaking 7-8..........................................................
7.5.4.1 Disabled (No Handshaking) 7-8.........................................
7.5.4.2 XON/XOFF 7-8.......................................................
7.5.5 Save 7-8.................................................................
7.5.6 Default Settings 7-8........................................................

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7.6 Terminal Mode 7-9...........................................................
7.6.1 Printing Selected Information 7-9............................................
7.6.2 Entire Log – [Ctrl]+[P] 7-10...................................................
7.6.3 Meters Printout – [Ctrl]+[M] 7-11.............................................
7.6.4 System Information Printout – [Ctrl]+[A] 7-12...................................
7.6.5 Battery Test Printout – [Ctrl]+[B] 7-12.........................................
7.7 System Configuration 7-13......................................................
7.7.1 System Configuration Mode Main Menu 7-13...................................
7.7.2 Program Building Alarms 7-13................................................
7.7.3 Enable/Disable Default Functions 7-14.........................................
7.7.4 Customize Alarm Messages 7-15..............................................
7.7.5 Program Unit Name 7-16....................................................
7.7.6 Adjust Output Voltage 7-16..................................................
7.7.7 Change Password 7-16......................................................
7.7.8 Battery Test Setup 7-17.....................................................
7.7.9 Modify Low Battery Time 7-18................................................
7.8 Calibration Mode 7-18..........................................................
7.9 Computer Mode 7-18..........................................................
7.10 Remote Monitor Mode 7-18.....................................................
7.11 Remote Notification 7-19.......................................................
8 Maintaining the UPS System 8-1.............................................
8.1 Important Safety Instructions 8-1................................................
8.2 Performing Preventive Maintenance 8-2..........................................
8.3 Maintenance Training 8-3......................................................
9 Product Specifications 9-1...................................................
10 Responding to System Events 10-1............................................
10.1 System Event Horns 10-1........................................................
10.2 System Event Lights 10-1........................................................
10.3 System Event Messages 10-1.....................................................
11 Using the LOAD OFF Button 11-1.............................................
11.1 Using the LOAD OFF Button 11-1................................................
11.2 Resetting the UPS System after Load Off 11-2......................................
Warranty W-1..............................................................

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iv EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
List of Figures
Figure 2-1. Typical Powerware 9315 UPS System 2-2..........................................
Figure 2-2. Main Elements of the UPS System 2-3............................................
Figure 3-1. Path of Current Through the UPS in Normal Mode 3-2..............................
Figure 3-2. Path of Current Through the UPS in Bypass Mode 3-3...............................
Figure 3-3. Path of Current Through the UPS in Battery Mode 3-4..............................
Figure 3-4. Location of the Monitor Panel and the Control Panel 3-5............................
Figure 4-1. UPS Control Panel 4-1..........................................................
Figure 5-1. UPS Monitor Panel 5-1.........................................................
Figure 5-2. Parts of the LCD Screen (Typical for Powerware 9315 300 480/480V UPS) 5-2...........
Figure 5-3. System Meters Screen (Typical for Powerware 9315 300 480/480V UPS) 5-5............
Figure 5-4. Load Amps Meters Screen 5-6...................................................
Figure 5-5. Event History Log Screen 5-7....................................................
Figure 5-6. Active System Events Screen 5-8.................................................
Figure 5-7. Unit Statistics Screen 5-9.......................................................
Figure 5-8. Mimic Screen 5-10..............................................................
Figure 5-9. Time Setup Screen 5-11.........................................................
Figure 5-10. Setup Serial Port 1 Screen 5-12..................................................
Figure 6-1. External Connections for Building Alarm Monitoring 6-1.............................
Figure 6-2. Summary Alarm Contacts 6-2....................................................
Figure 6-3. Remote Monitor Panel 6-3......................................................
Figure 6-4. Relay Interface Module 6-6.....................................................
Figure 6-5. Supervisory Contact Module 6-7.................................................
Figure 7-1. Location of Communication Bays on the UPS (Powerware 9315 300) 7-2...............
Figure 7-2. Optional X-Slot Cards 7-3.......................................................
Figure 7-3. Port 1 (DB-9) Pin Assignments 7-4................................................
Figure 7-4. Port 2 (DB-25) Pin Assignments 7-4...............................................
Figure 7-5. Setup Serial Port 1 Screen 7-6...................................................
Figure 7-6. Event History Log 7-10..........................................................
Figure 7-7. System Meters 7-11.............................................................
Figure 7-8. Battery Test Log 7-12...........................................................

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EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
Chapter 1 Introduction
The Powerware®9315 uninterruptible power supply (UPS) online power protection
prevents loss of valuable electronic information, minimizes equipment downtime, and/or
minimizes the adverse effect on equipment production due to unexpected power
problems.
The Powerware 9315 UPS continually monitors incoming electrical power and removes the
surges, spikes, sags, and other irregularities that are inherent in commercial utility power.
Working with your building’s electrical system, the UPS supplies clean, consistent power
that your sensitive electronic equipment requires for reliable operation. During brownouts,
blackouts, and other power interruptions, one or more optional battery cabinets can
provide emergency power to safeguard your operation.
The UPS functions automatically and require very little attention during normal operation.
However, you should read and understand the procedures described in this manual to
ensure trouble-free operation. In particular, you should be thoroughly familiar with the
Load Off procedure described in Chapter 11, “Using the LOAD OFF Button.”
1.1 Conventions Used in This Manual
This manual uses these type conventions:
쑺Bold type highlights important concepts in discussions, key terms in procedures, and
menu options, or represents a command or option that you type or enter at a prompt.
쑺Italic type highlights notes and new terms where they are defined.
쑺Screen type represents information that appears on the screen or LCD.
Icon Description
Information notes call attention to important features or instructions.
[Keys] Brackets are used when referring to a specific key, such as [Enter] or [Ctrl].
In this manual, the term UPS refers only to the UPS cabinet and its internal elements. The
term UPS system refers to the entire power protection system – the UPS cabinet, battery
strings, and options or accessories installed.

Introduction
1-2 EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
1.2 For More Information
Refer to the Powerware 9315 UPS (200–300 kVA) Installation Manual for the following
additional information:
쑺How to prepare your site and plan for installation
쑺Detailed step-by-step procedures for installing each component of your system
쑺Detailed illustrations of cabinets and optional accessories, including dimensions and
connection points
Visit www.powerware.com or contact your Eaton service representative for information on
how to obtain copies of this manual.
1.3 Getting Help
If help is needed with any of the following:
쑺Scheduling initial startup
쑺Regional locations and telephone numbers
쑺A question about any of the information in this manual
쑺A question this manual does not answer
Please call the Eaton Help Desk for Powerware products at:
In the United States 1-800-843-9433 or 1-919-870-3028
In Canada 1-800-461-9166
All other countries Call your service representative

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EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
Chapter 2 Getting Started
2.1 Safety Warnings
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that you should follow during installation and
maintenance of the UPS and batteries. Please read all instructions before operating the
equipment and save this manual for future reference.
DANGER
This UPS contains LETHAL VOLTAGES. All repairs and service should be performed by
AUTHORIZED SERVICE PERSONNEL ONLY.ThereareNO USER SERVICEABLE PARTS inside
the UPS.
WARNING
쑺This UPS contains its own energy source (batteries). The output receptacles may carry live
voltage even when the UPS is not connected to an AC supply.
쑺Do not remove or unplug the input cord when the UPS is turned on. This removes the
safety ground from the UPS and the equipment connected to the UPS.
쑺To reduce the risk of fire or electric shock, install this UPS in a temperature and humidity
controlled, indoor environment, free of conductive contaminants. Ambient temperature
must not exceed 40°C (104°F). Do not operate near water or excessive humidity (95% max).
쑺Ensure all power is disconnected before performing installation or service.
CAUTION
쑺Batteries can present a risk of electrical shock or burn from high short-circuit current.
Observe proper precautions. Servicing should be performed by qualified service personnel
knowledgeable of batteries and required precautions. Keep unauthorized personnel away
from batteries.
쑺Proper disposal of batteries is required. Refer to your local codes for disposal requirements.
쑺Never dispose of batteries in a fire. Batteries may explode when exposed to flame.
쑺Keep the UPS doors closed to ensure proper cooling airflow and to protect personnel from
dangerous voltages inside the unit.
쑺Do not operate the UPS system close to gas or electric heat sources.
쑺The operating environment should be maintained within the parameters stated in this
manual.
쑺The UPS system is not intended for outdoor use.

Getting Started
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쑺Keep surroundings uncluttered, clean, and free from excess moisture.
쑺Observe all DANGER, CAUTION, and WARNING notices affixed to the inside and outside of
the equipment.
2.2 Typical Powerware 9315 UPS System
Each component of the UPS system is housed in a free-standing cabinet designed for
industrial or computer room applications. The cabinets match in style and color, and have
safety shields behind the doors for hazardous voltage protection. Figure 2-1 shows a typical
Powerware 9315 UPS system.
Input
Transformer
Cabinet
Output
Transformer
Cabinet
(optional)
PDM
Cabinet
(optional–
requires 480/208
transformer)
UPS
Cabinet
Battery
Cabinet
(optional)
Figure 2-1. Typical Powerware 9315 UPS System
Each cabinet of the UPS system is shipped separately. As shown in Figure 2-1, you can
combine a UPS with any of the options described in this manual to meet your system
needs. The UPS and options are described in detail later in this manual. The following
descriptions provide a brief overview of standard UPS features and available
enhancements.
NOTE You should read this manual and have thorough knowledge of UPS operation
before attempting to operate any of the UPS switches, controls, or optional components.

Getting Started
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2.3 Looking Inside the UPS
The Powerware 9315 is a continuous-duty, solid-state UPS that supports the following
equipment: process control, data processing, telecommunications/PBX, research, and
medical. The Powerware 9315 maintains power to the critical loads during commercial
electrical power brownout, blackout, overvoltage, undervoltage, and out-of-tolerance
frequency conditions.
The power required by your equipment is called the critical load. The UPS supplies the
critical load with conditioned power that is synchronized with your utility power. Figure 2-2
shows the main elements of the UPS.
Battery Cabinet
AC Input to
Rectifier/
Charger
AC Input to
Bypass
Input
Filter
UPS Cabinet
Digital
Metering
Static
Switch
Bypass
Contactor
Output
Contactor
Output
Transformer
InverterRectifier/
Charger
Power Processing
Unit (PPU)
AC Output
to Critical
Load
Figure 2-2. Main Elements of the UPS System
If utility power is interrupted or falls outside the parameters specified in Chapter 9,
“Product Specifications,” the UPS uses a backup battery supply to maintain power to the
critical load for a specified period of time or until the utility power returns. For extended
power outages, the backup battery supply allows you to either transfer to an alternative
power system (such as a generator) or shut down the critical load in an orderly manner.
The operation of the UPS system is described in greater detail in Chapter 3,
“Understanding UPS Operation.” Chapter 9, “Product Specifications,” outlines the storage
and operating specifications for the UPS and optional battery.

Getting Started
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2.4 UPS Standard Features
The UPS has many standard features that provide cost-effective and consistently reliable
power protection:
2.4.1 Monitor Panel
The Monitor Panel on the front of the UPS contains an LCD screen to display the current
status of the UPS. You can view a statistical history and log of UPS events and display a
real-time graphic representation of power flowing through the UPS components. Backlit
status indicators show the operating mode of the UPS and alert you to system events. The
emergency LOAD OFF button is also located on the monitor panel and is described in
Chapter 5, “Using the Monitor Panel.”
2.4.2 Control Panel
The Control Panel inside the right door of the UPS contains the operator controls to start
and stop the UPS, change the operating mode, and reset the LOAD OFF button. The
Control Panel is described in “Using the Control Panel” on page 4-1.
2.4.3 Communication Bays
쑺X-Slot®Communication Bay – The Communications Bay allows internal, UPS-powered
communication with optional X-Slot cards. The X-Slot cards support several protocols
such as SNMP, HTTP, and Modbus®. See Chapter 7, “Communication” for additional
information.
쑺Computer Interface – Serial communication ports are standard on all UPSs, and are
electrically isolated from the UPS. You can use these ports to link the UPS to the
features described in Chapter 7, “Communication.”
쑺Summary Alarm Contacts – Alarm contacts are provided for connection to equipment
at your facility such as a light, an audible alarm, or a computer terminal. The equipment
you connect to these contacts alerts you to a UPS alarm. This feature is described
further in Chapter 6, “Using Features and Options.”
쑺Building Alarm Monitoring – You can connect your facility’s alarm system contacts to
six inputs in the UPS. The UPS uses these inputs to monitor your building alarms in
addition to the UPS status. This feature is described further in Chapter 6, “Using
Features and Options.”
2.4.4 Input Filter
Your UPS may be equipped with an input filter. An input filter yields power factor
correction that allows you to save on the initial installation and operating costs. The filter
also reduces input harmonic current distortion and minimizes upstream interference that
can damage sensitive hardware components.

Getting Started
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EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
2.4.5 Emergency Load Off
A LOAD OFF button is provided for situations where you must immediately remove all
power to the critical load. The button is located on the front of the UPS for quick access
and is covered with a clear plastic shield to prevent inadvertent operation. The shield must
be raised before pressing the button. The LOAD OFF button is described in detail in
Chapter 11, “Using the LOAD OFF Button.”
2.4.6 Automatic Battery Charge Current Limit
A preset limit restricts battery charging current to protect batteries from damage due to
high current charging. Charging at high currents can overheat and damage batteries.
2.4.7 Installation Features
Power wiring can be routed through the top or bottom of each UPS cabinet. External
sensing and monitoring control wire must be installed in accordance with Class 2 wiring
methods. Bottom entry is provided for Class 2 wiring.
2.5 Options and Accessories
Contact a Powerware sales representative for information about any of these available
options:
2.5.1 Battery
You can enhance the protection provided by the UPS with one or more backup battery
supplies equipped with sealed lead-acid, maintenance-free batteries in a matching cabinet.
Each battery cabinet contains individual modular battery trays and a battery circuit breaker.
Several battery capacities are available.
The UPS battery cabinets can be paralleled; you can increase the battery backup time by
adding battery cabinets to your UPS system. The Powerware 9315 can support up to four
battery cabinets.
2.5.2 External Battery Disconnect
An optional DC circuit breaker, enclosed in a wall-mounted box adjacent to the UPS,
provides a manual means of disconnecting a battery that is located remotely from the UPS.
This option is described further in Chapter 6, “Using Features and Options.”

Getting Started
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2.5.3 Power Distribution Module (LV models only)
An optional output Power Distribution Module (PDM) is available to distribute the output
power of the UPS to the critical load. The PDM cabinet has one or two panels, each
containing up to 42 poles for breaker switches. This arrangement provides flexibility for the
needs of your facility. Each panel is controlled by one 225A feeder breaker. The PDM is
enclosed in a separate cabinet that matches the UPS. This option requires a 480 to 208V
transformer.
2.5.4 Upgrade Capability
The UPS is available in various output power ratings in both 50 and 60 Hz models. If your
power requirements increase, you can upgrade the UPS system to provide more output
power with minimum impact on your facility.
2.5.5 Remote Monitor Panel
An optional Remote Monitor Panel (RMP) contains backlit status indicators and a local
horn, allowing you to monitor the operational status and alarm condition of the UPS from
virtually any location within your facility. You can install multiple RMPs at remote locations
to increase your monitoring capabilities. This option is described further in Chapter 6,
“Using Features and Options.”
2.5.6 Relay Interface Module
An optional Relay Interface Module (RIM) uses relay contact closures to indicate the
operating status and alarm condition of the UPS system. The module uses a serial interface
line and may support up to eight critical loads. This option is described further in
Chapter 6, “Using Features and Options.”
2.5.7 Input Isolation Transformer
Optional 480/480, 208/480, or 600/480 Vac input isolation transformers provide an isolated
input to the rectifier for applications that require a DC link that is not ground referenced
or for applications requiring an input of 208 or 600 Vac. The transformers are contained in
separate cabinets.
2.5.8 5% Input Filter
An optional 480/480 Vac 5% input filter reduces input harmonic current distortion and
minimizes upstream interference that can damage sensitive hardware components. The
filter is contained in a separate cabinet.

Getting Started
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2.5.9 Output Transformer
An optional 480/208 Vac output auto transformer provides a 208 Vac output for
applications that require 208 Vac. The transformer is contained in a separate cabinet.
2.5.10 Modem
An optional modem is available for use with the UPS Remote Notification feature
described in “Remote Notification” on page 7-19. Refer to the manual supplied with the
modem for operating instructions.
2.5.11 Customer Convenience Outlet
An uninterruptible 120 Vac, 0.2A, fuse-protected convenience outlet is provided to supply
power to the optional modem. It is located adjacent to the Communication Panel.

Getting Started
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2.6 Symbols, Controls, and Indicators
These symbols may appear on the UPS system or on labels inside the UPS. They are
accepted by most international safety agents. Everyone in your organization who works
with your UPS should understand the meaning of these symbols:
ON -The principal power switch is in the On position.
OFF -The principal power switch is in the Off position.
PHASE -The word “phase.”
RISK OF ELECTRIC SHOCK - Indicates that a risk of electric shock is present and the associated
warning should be observed.
CAUTION: REFER TO OPERATOR’S MANUAL - Refer to your operator’s manual for additional
information, such as important operating and maintenance instructions.
This symbol indicates that you should not discard the UPS or the UPS batteries in the trash. The UPS
may contain sealed, lead-acid batteries. Batteries must be recycled.
This symbol indicates that you should not discard waste electrical or electronic equipment (WEEE) in
the trash. For proper disposal, contact your local recycling/reuse or hazardous waste center.

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EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
Chapter 3 Understanding UPS Operation
The UPS functions automatically to supply AC electrical power to the critical load. The UPS
always operates in one of three modes:
쑺In Normal mode, the critical load is supplied by the inverter, which derives its power
from rectified utility AC power. In this mode, the rectifier also provides charging current
for the battery.
쑺In Bypass mode, the critical load is directly supported by utility power.
쑺In Battery mode, the battery cabinet provides DC power, which maintains inverter
operation. The battery supports the critical load.
The UPS continually monitors itself and the incoming utility power, and automatically
switches between these modes as required, with no operator intervention. The
sophisticated detection and switching logic inside the UPS ensures that operating mode
changes are automatic and transparent to the critical load. The UPS switches operating
modes in response to these system events:
쑺A command is an intervention that is externally initiated by an operator or by some site
action. A command causes the UPS to switch operating modes; it usually does not
require any further action by you.
쑺A notice is a minor system event that may or may not require your attention.
쑺An alarm is a system event that requires immediate operator intervention.
System events, alarm horns, and indicator lights are described in Chapter 10, “Responding
to System Events.”
3.1 Normal Mode
In Normal mode, utility AC power is supplied to the rectifier. The rectifier supplies DC
power to the inverter, which then supplies the critical load with AC power. The rectifier
also provides charging power to the battery. The battery charge condition is monitored by
the UPS and reported by a status indicator on the Monitor Panel. The message “System
Normal” appears in the status area of the LCD screen.
Figure 3-1 shows the path of electrical power through the UPS system when the UPS is
operating in Normal mode.

Understanding UPS Operation
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Bypass
Input
Rectifier
Input
Output
Path of electrical power Battery
Rectifier Inverter
Bypass
K4
Transformer
K3
(Closed)
CB1
Figure 3-1. Path of Current Through the UPS in Normal Mode
If the utility AC power is interrupted or is out of specification, the UPS automatically
switches to Battery mode to support the critical load with no interruption. When utility
power returns, the UPS returns to Normal mode.
If the UPS system becomes overloaded, the UPS switches to Bypass mode. The UPS
automatically returns to Normal mode when the error condition is cleared and system
operation is restored within specified limits.
If the UPS suffers an internal failure, it switches automatically to Bypass mode and remains
in that mode until the failure is corrected and the UPS is back in service.

Understanding UPS Operation
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EATON Powerware®9315 UPS (200–300 kVA) Operation Manual S164201036 Rev F powerware.com
3.2 Bypass Mode
The UPS automatically switches to Bypass mode if it detects an overload, load fault, or
internalfailure.ThebypasssourcesuppliesthecommercialACpowertotheloaddirectly.
CAUTION
The critical load is not protected while the UPS is in Bypass mode.
Figure 3-2 shows the path of electrical power through the UPS system when the UPS is
operating in Bypass mode.
Bypass
Input
Rectifier
Input
Output
Path of electrical power Battery
Rectifier Inverter
Bypass
K4
Transformer
K3
(Open)
CB1
Figure 3-2. Path of Current Through the UPS in Bypass Mode
You can transfer the UPS from Normal mode to Bypass mode manually. However, the UPS
switches automatically to Bypass mode whenever the inverter can no longer supply the
critical load. If the UPS transfers to Bypass mode from Normal mode due to any reason
other than operator intervention, the UPS automatically attempts to transfer back to
Normal mode (up to three times within a 10-minute period). The fourth transfer will lock
the critical load on the bypass source and requires operator intervention to transfer.
Bypass mode is a normal operating mode, and not an alarm condition. However, if the UPS
is unable to return to Normal mode following an automatic transfer to Bypass mode, an
alarm condition is recorded.

Understanding UPS Operation
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3.3 Battery Mode
The UPS transfers to Battery mode automatically if a utility power outage occurs, or if the
utility power does not conform to specified parameters. In Battery mode, the battery
provides emergency DC power that the inverter converts to AC power. When the UPS
switches to Battery mode, the alarm indications depend on the cause and condition of the
battery charge. The length of time the system can operate in Battery mode depends on
load configuration and the battery charge.
Figure 3-3 shows the path of electrical power through the UPS when operating in Battery
mode.
Bypass
Input
Rectifier
Input
Output
Path of electrical power Battery
Rectifier Inverter
Bypass
K4
Transformer
K3
(Closed)
CB1
Figure 3-3. Path of Current Through the UPS in Battery Mode
When the discharging battery voltage reaches the lower limit of UPS operation capability,
the critical load transfers to Bypass mode if it is available. If Bypass input is not available, a
“Shutdown Imminent” warning occurs. The warning time before critical load loss occurs is
approximately two minutes, depending on load configuration and the battery charge.
If incoming power returns to within specified parameters, the UPS automatically returns to
Normal mode and alarm indications clear. However, the process of returning to Normal
mode is not instantaneous. The rectifier gradually draws increasing power from the
incoming utility until Normal mode is achieved.