Toshiba G2020 Series User manual

INSTALLATION AND OPERATION MANUAL
480/480 V 500kVA/750kVA
Document: 94861-004
Ref: 4GBH0099 Rev. D
April 2020

G2020 Series UPS Installation and Operation Manual –94861-004 i
UNINTERRUPTIBLE POWER SYSTEM
If additional information or technical assistance is required call TOSHIBA Customer Support Center at [phone], or
write to: Toshiba International Corporation, 13131 West Little York Road, Houston, TX 77041-9990 Attn: UPS Product
Manager.
Please complete the following information for your records.
Keep this manual with the UPS equipment.
Job Number:
Model Number:
Serial Number:
Application:
Shipping Date:
Date of Installation:
Inspected By:
IMPORTANT NOTICE
Never attempt to install, operate, maintain or dispose of this equipment until you have first read and understood
all of the relevant product warnings and user directions that are contained in this Installation manual.
The installation of this equipment must only be performed by qualified personnel.
The Instructions contained in this manual are not intended to cover all of the details or variations in equipment
or to provide for every possible contingency to be met in connection with installation, operation, or
maintenance. Should further information be required or should particular problems arise which are not covered
sufficiently the matter should be referred to the local TOSHIBA sales office.
Nothing in this manual shall alter Toshiba International Corporation’s standard terms and conditions
or the conditions of any written sales contract.
Any Electrical or mechanical modifications to this equipment without prior written consent of
TOSHIBA will void all warranties and may void UL/CUL listing. Unauthorized modifications
may also result in personal injury, death, or equipment damage.

ii G2020 Series UPS Installation and Operation Manual –94861-004
Purpose and Scope of Manual
This manual provides information on how to safely install, operate, and maintain your TOSHIBA power electronics product.
This manual includes a section on General Safety Instructions that describes the warning labels and symbols that are used
throughout the manual. Read the manual completely before installing, operating, or performing maintenance on this
equipment.
This manual and the accompanying drawings should be considered a permanent part of the equipment and should be
readily available for reference and review. Dimensions shown in the manual are in metric and/or the English equivalent.
TOSHIBA reserves the right, without prior notice, to update information, make product changes, or to discontinue any
product or service identified in this publication.
TOSHIBA is a registered trademark of TOSHIBA INTERNATIONAL CORPORATION. All other product or trade references
appearing in this manual are registered trademarks of their respective owners.
TOSHIBA shall not be liable for technical or editorial omissions or mistakes in this manual. Nor shall it be liable for
incidental or consequential damages resulting from the use of information contained in this manual.
This manual is copyrighted. No part of this manual may be photocopied or reproduced in any form without the prior written
consent of TOSHIBA INTERNATIONAL CORPORATION.
© Copyright 2020 TOSHIBA INTERNATIONAL CORPORATION
All rights reserved.
Contacting TOSHIBA Customer Support Center
The TOSHIBA Customer Support Center can be contacted to obtain help in resolving any Uninterruptible Power System
problem that you may experience or to provide after sales service support.
Toshiba Customer Support Center
8 a.m. to 5 p.m. (CST) –Monday through Friday
Tel [phone]
Fax [phone]
E-mail –[e-mail]
You may contact TOSHIBA by writing to:
TOSHIBA INTERNATIONAL CORPORATION.
SOCIAL INFRASTRUCTURE SYSTEMS GROUP
POWER ELECTRONICS DIVISION
13131 West Little York Rd.
Houston, TX 77041-9990
Attn: UPS Product Manager
For further information on Toshiba products and services, please visit our website at:
http://www.toshibaups.com

G2020 Series UPS Installation and Operation Manual –94861-004 iii
Table of Contents
List of Tables........................................................................................................................................................................iv
List of Figures........................................................................................................................................................................v
1How to use this Manual.................................................................................................................................................1
1.1 Notice Icons.............................................................................................................................................................1
1.2 Qualified Personnel.................................................................................................................................................2
2INTRODUCTION .............................................................................................................................................................3
2.1 SAFETY PRECAUTIONS.......................................................................................................................................4
3GENERAL .......................................................................................................................................................................7
3.1 DEFINITIONS..........................................................................................................................................................8
3.2 OPERATION OVERVIEW.......................................................................................................................................8
3.2.1 Normal Operation: Load power supplied by each system UPS inverter.................................................................9
3.2.2 Bypass Operation: Load power supplied through UPS internal static bypass line...............................................10
3.2.3 Battery operation: Load Power supplied by UPS battery......................................................................................11
3.2.4 Battery Charging Operation ..................................................................................................................................12
3.2.5 UPS Parts Location...............................................................................................................................................13
3.3 SPECIFICATIONS ................................................................................................................................................17
4OPERATOR CONTROLS AND INDICATORS.............................................................................................................20
4.1 LED DISPLAY.......................................................................................................................................................21
4.2 EPO BUTTON (Emergency Power Off button).....................................................................................................21
4.3 LIQUID CRYSTAL DISPLAY ................................................................................................................................21
4.3.1 MENU....................................................................................................................................................................22
4.3.2 Input Power Failure...............................................................................................................................................26
4.3.3 Fault Indication......................................................................................................................................................26
4.4 EXTERNAL AUX CONTACT INPUT AND OUTPUT TERMINAL BLOCKS.........................................................27
4.4.1 Aux Contacts –Input.............................................................................................................................................28
4.4.2 Aux Contacts –Output..........................................................................................................................................31
4.5 RemotEye®INTRODUCTION...............................................................................................................................33
4.6 CONNECTOR DEFINITION..................................................................................................................................36
5INSTALLATION AND OPERATION.............................................................................................................................38
5.1 TRANSPORTATION AND INSTALLATION..........................................................................................................38
5.2 INSTALLATION PROCEDURE.............................................................................................................................38
5.3 PROCEDURE FOR CABLE CONNECTIONS......................................................................................................39
5.4 OPERATING PROCEDURES...............................................................................................................................54
6RESPONSE TO UPS FAILURE....................................................................................................................................60
7PARTS REPLACEMENT .............................................................................................................................................. 61
8FAULT CODES ............................................................................................................................................................. 62
9DAILY INSPECTION..................................................................................................................................................... 67
APPENDIX A Installation Planning Guides (IPG) & Outline Drawings...................................................................... 68
APPENDIX B Index .........................................................................................................................................................74

iv G2020 Series UPS Installation and Operation Manual –94861-004
List of Tables
Table 2-1 UPS Installation Environment ..............................................................................................................................5
Table 2-2 Rating of Bypass Input Circuit Breaker................................................................................................................6
Table 3-1 Power Specifications..........................................................................................................................................17
Table 3-2 UPS Module Information....................................................................................................................................17
Table 3-3 UPS Module Information (Packing Dimension)..................................................................................................17
Table 3-4 UPS Module Efficiency.......................................................................................................................................17
Table 3-5 Specifications.....................................................................................................................................................18
Table 3-6 Rating of Contactors, Breakers, and Fuses.......................................................................................................19
Table 4-1 External Input Functions ....................................................................................................................................30
Table 4-2 External Output Functions..................................................................................................................................32
Table 4-3 Parts List for UPS Monitoring.............................................................................................................................35
Table 5-1 Transport by Overhead Crane ...........................................................................................................................38
Table 5-2 List of UPS Weights...........................................................................................................................................38
Table 5-3 Maximum Permitted Fault Current.....................................................................................................................39
Table 5-4 Recommended Cable Sizes...............................................................................................................................42
Table 5-5 Recommended Hardware..................................................................................................................................42
Table 5-6 Crimp Type Compression Lug ...........................................................................................................................43
Table 7-1 Standard Replacement Parts List ......................................................................................................................61
Table 7-2 Replacement Air Filters......................................................................................................................................62
Table 8-1 Fault Codes........................................................................................................................................................62
Table 9-1 How to Perform Daily Inspection........................................................................................................................67

G2020 Series UPS Installation and Operation Manual –94861-004 v
List of Figures
Figure 3-1 Single Line Diagram –Normal Operation: Load fed by UPS inverter.................................................................9
Figure 3-2 Single Line Diagram –Bypass Operation: Load fed through static bypass line...............................................10
Figure 3-3 Single Line Diagram –Battery Operation: Load fed by Battery.....................................................................11
Figure 3-4 Typical Battery Charging Curve........................................................................................................................12
Figure 3-5 UPS Parts Location (500kVA)...........................................................................................................................13
Figure 3-6 UPS Parts Location (750kVA)...........................................................................................................................14
Figure 3-7 Display PCB DPAU-81......................................................................................................................................15
Figure 3-8 MAIN PCB UPHR-X..........................................................................................................................................15
Figure 3-9 External I/F PCB IOAU-09................................................................................................................................15
Figure 3-10 Parallel I/F PCB IFAU-09................................................................................................................................16
Figure 4-1 Operation/Display Panel (Front panel)..............................................................................................................20
Figure 4-2 Main Screen......................................................................................................................................................22
Figure 4-3 Startup/Shutdown Screen.................................................................................................................................22
Figure 4-4 Startup Guidance..............................................................................................................................................23
Figure 4-5 Shutdown Guidance..........................................................................................................................................23
Figure 4-6 Input Values......................................................................................................................................................23
Figure 4-7 Output Values ...................................................................................................................................................23
Figure 4-8 Values in Battery operation...............................................................................................................................23
Figure 4-9 Remote/Local Operation Select........................................................................................................................24
Figure 4-10 Date & Time Adjustment.................................................................................................................................24
Figure 4-11 Log Menu........................................................................................................................................................25
Figure 4-12 Event Log........................................................................................................................................................25
Figure 4-13 Battery Log......................................................................................................................................................25
Figure 4-14 Main Screen (Battery Operation)....................................................................................................................26
Figure 4-15 Measurement Screen (Battery Operation)......................................................................................................26
Figure 4-16 Main Screen (Fault Indication)........................................................................................................................26
Figure 4-17 Message Screen.............................................................................................................................................27
Figure 4-18 Location of External Signal Terminal Block on IOAU-09 PCB........................................................................27
Figure 4-19 Control Wiring for Aux Input Contacts.............................................................................................................28
Figure 4-20 External Signal Input Terminal Block (with default settings)...........................................................................29
Figure 4-21 Control Wiring for Aux Output Contacts..........................................................................................................31
Figure 4-22 External Signal Output Terminal Block (with default settings)........................................................................31
Figure 4-23 RemotEye® Installation (Overview 500kVA)..................................................................................................33
Figure 4-24 Connection between Display Control PCB (SW1) and RemotEye® Module .................................................34
Figure 4-25 PSAU-60 (PS1)...............................................................................................................................................35
Figure 4-26 DPAU-81 (SW1)..............................................................................................................................................35
Figure 4-27 Cable1 (3BBA0083P001)................................................................................................................................35
Figure 4-28 Connector (CN1) of PSAU-60 (PS1)...............................................................................................................36

vi G2020 Series UPS Installation and Operation Manual –94861-004
Figure 4-29 Terminal Block (TN) and VH connector (CN2) of PSAU-60 (PS1).................................................................36
Figure 4-30 Connector (CN44) of PSAU-60 (PS1).............................................................................................................36
Figure 4-31 Connector (CN27) of DPAU-81 (SW1)...........................................................................................................37
Figure 5-1 UPS Terminal Designation................................................................................................................................43
Figure 5-2 Diagram of input/output bus bars and terminal blocks (500kVA) .....................................................................44
Figure 5-3 Diagram of input/output bus bars and terminal blocks (750kVA) .....................................................................45
Figure 5-4 Diagram of Power Wire & Control Wire Inter-Connect between UPS and Battery...........................................46
Figure 5-5 Diagram of Power Wire Connections (Parallel System Configuration).............................................................47
Figure 5-6 Diagram of Power & Control Wire Connections for 2 units in MMS Configuration...........................................48
Figure 5-7 Detail of IFAU-09 Control Wire Connections for 2 units in MMS Configuration ...............................................49
Figure 5-8 Diagram of Power & Control Wire Connections for 3-4 units in MMS Configuration........................................50
Figure 5-9 Detail of IFAU-09 Control Wire Connections for 3 or 4 units in MMS Configuration........................................51
Figure 5-10 Diagram of Power Wire & Control Wire Connections for 5 to 8 units in MMS Configuration .........................52
Figure 5-11 Detail of IFAU-09 Control Wire Connections for 5 to 8 units in MMS Configuration ......................................53
Figure 5-12 Circuit Protectors Location..............................................................................................................................54
Figure 5-13 Automatic Startup of Inverter and Converter..................................................................................................55
Figure 5-14 Close Battery Breaker.....................................................................................................................................55
Figure 5-15 Press and Hold START Button.......................................................................................................................55
Figure 5-16 Transfer from Online to Bypass......................................................................................................................56
Figure 5-17 Transfer from Bypass to Online......................................................................................................................56
Figure 5-18 Initiate Shutdown.............................................................................................................................................57
Figure 5-19 UPS Transfers to Bypass................................................................................................................................57
Figure 5-20 Open Battery Breaker .....................................................................................................................................58
Figure 5-21 LCD Screen (MMS Operation)........................................................................................................................59

G2020 Series UPS Installation and Operation Manual –94861-004 1
1 How to use this Manual
This manual is designed for ease of use, giving the user easy and quick reference to information.
This manual uses notice icons to draw attention to the user important information regarding the safe operation and
installation of the UPS.
1.1 Notice Icons
The notice icons used in this manual are explained below, and should be taken into account and adhered to whenever
they appear in the text of this manual.
Warning: A warning symbol shows potentially hazardous situation or condition which could result in
personal injury or death, if not avoided.
Caution: A caution symbol shows potentially hazardous situation or condition which could result in
personal injury or equipment damage, if not avoided.
Note: A Note symbol shows the information the user or the service personnel should observe during
the UPS operation or service work.
Prohibit: A prohibit symbol shows the act the user or the service personnel should NEVER perform
during the UPS installation, operation or service work.
Safety Recommendations: If any problems are encountered while following this manual, contact the Toshiba Customer
Support Center.
WARNING
CAUTION
!
NOTE
PROHIBIT

2 G2020 Series UPS Installation and Operation Manual –94861-004
1.2 Qualified Personnel
Only qualified persons are to install, operate or service this equipment according to all applicable codes and
established safety practices.
A qualified person must:
1) Read this entire instruction manual carefully.
2) Be skilled in the installation, construction or operation of the equipment and aware of the hazards involved.
3) Be trained and authorized to safely energize, de-energize, clear, ground, lockout and tag circuits in accordance
with established safety practices
4) Be trained and authorized to perform the service, maintenance or repair of this equipment
5) Be trained in the proper care and use of protective equipment such as rubber gloves, hard hat, safety glasses,
face shield, flash clothing, etc. in accordance with established practices
6) Be trained in rendering first aid.

G2020 Series UPS Installation and Operation Manual –94861-004 3
2 INTRODUCTION
The TOSHIBA Uninterruptible Power Supply System (UPS) is designed to provide many years of reliable protection
from power failure, brown-outs, line noise, and voltage transients. To ensure optimum performance of the equipment,
follow the manufacturer's instructions. This manual contains descriptions required to operate the UPS. Please read
this manual carefully and retain it for future reference.
This manual contains important instructions for the G2020 SERIES Uninterruptible Power Supply System that should
be followed during installation and maintenance of the UPS and batteries.
Lethal voltages exist within the equipment during operation. Observe all warning and cautions in
this manual. Failure to comply may result in serious injury or death. Obtain qualified service for
this equipment as instructed.
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
WARNING 1
CAUTION
WARNING

4 G2020 Series UPS Installation and Operation Manual –94861-004
In no event will TOSHIBA be responsible or liable for either indirect or consequential damage or injury that
may come from the misuse of this equipment.
Don’t modify the UPS entirely or partially.
Any modifications without authorization by TOSHIBA could result in personal injuries,
death or destruction of the UPS.
2.1 SAFETY PRECAUTIONS
UNINTENDED USAGE
This UPS shall NOT be used in the following applications. Use of this UPS in any
of the below applications will result in serious injury or death:
Medical operation room equipment
Life support equipment
Fire Prevention or Suppression Equipment
Always read all applicable regulations and standards for the application of this
UPS. Special considerations are required when using this UPS in the following
applications:
Nuclear Power Plants.
Control Equipment.
Transportation Equipment
WARNING 2
WARNING
PROHIBIT
PROHIBIT
!
NOTE

G2020 Series UPS Installation and Operation Manual –94861-004 5
The UPS is to be installed in a controlled environment.
Improper storage and installation environment may deteriorate insulation, shorten component life and cause
malfunctions.
Keep the installation environment per standard described as follows:
Table 2-1 UPS Installation Environment
No
Item
Environment standard
1
Installation
Location
Indoors
2
Ambient
temperature
Minimum temperature: 32F (0C)
Maximum temperature: 104F (40C)
The average temperature over any 24-hour period must be in the range
41F (5C) to 95F (35C).
3
Relative
humidity
The relative humidity must be held between 5 and 95%.
There must be no condensation due to temperature changes.
4
Altitude
This equipment is designed to operate without derating at 1980m (6500ft)
above sea level.
5
Dust
Dust in the room where the UPS is installed must not exceed normal
atmospheric dust levels. In particular, that dust should not include iron
particles, oils or fats, or organic materials such as silicone.
6
Inflammable
gas
following
IEC654-4
Part 4
There should be no inflammable/explosive gas.
Hydrogen sulfide (H2S)
No more than 0.003 PPM
Sulfurous acid gas (SO2)
No more than 0.01 PPM
Chlorine gas (Cl2)
No more than 0.002 PPM
Ammonia gas (NH3)
No more than 1 PPM
Nitrous oxides (NOx)
No more than 0.05 PPM
Ozone (O3)
No more than 0.002 PPM
WARNING 3
4
WARNING

6 G2020 Series UPS Installation and Operation Manual –94861-004
This UPS does not include a Bypass input circuit breaker (MCCB) to protect bypass circuit. The
Bypass input circuit breaker (MCCB) is to be field supplied and installed separately.
Recommended Breaker (MCCB)'s Specifications are as follows:
Table 2-2 Rating of Bypass Input Circuit Breaker
Capacity
(kVA)
Bypass Voltage
(Vac)
Bypass Current
(Aac)
Breaker
(A)
500
480
601
800
750
480
902
1200
AC input and AC output overcurrent protection and disconnect devices shall be field supplied and installed
separately. The DC circuit breaker (MCCB) shall be field supplied and installed separately. The overcurrent
protection device should be installed in the Battery cabinet and rated as indicated in Table 3-6.
The DC input overcurrent protection (Battery disconnect breaker) hereinafter will be
referred as “CB2”.
WARNING 4
WARNING
!
NOTE

G2020 Series UPS Installation and Operation Manual –94861-004 7
3 GENERAL
The TOSHIBA G2020 SERIES UPS is designed to provide continuous and clean electrical power to a critical load.
Additionally, the UPS monitors power conditions affecting the load.
In the event of an input power failure, the UPS will supply power to the critical load for the specified battery time.
If the input power is not restored promptly, backup power from the UPS battery permits the orderly shutdown of
equipment supported by the UPS. The UPS is simple to start-up, operate and maintain.
The G2020 SERIES UPS is available in 500 kVA & 750kVA capacities. Specifications are shown in Section 3.3. The
principles of operation described in this manual are applicable to all models.
This manual provides an overview of the G2020 SERIES components and their functions. The appearance and
purpose of operator controls and indicators is described with procedures for operation, start-up, shutdown and basic
maintenance included.

8 G2020 Series UPS Installation and Operation Manual –94861-004
3.1 DEFINITIONS
UNINTERRUPTIBLE POWER SYSTEM (UPS) –All components within the UPS Module Cabinet and associated
batteries that function as a system to provide continuous, conditioned AC power to a load. This is sometimes referred
to as the "System".
UPS MODULE CABINET –The metal enclosure which contains the Converter / Charger, Inverter, Static Transfer
Switch, Internal Bypass line, operator controls, and internal control systems required to provide specified AC power to
a load.
UPS MODULE –The Converter / Charger and Inverter assemblies which, under the direction of the internal control
system and operator controls, provide specified AC power to a load.
INVERTER –The UPS components which contain the equipment and controls necessary to convert DC power from
the Converter / Charger, or the battery, to AC power required by the critical load.
CONVERTER / CHARGER –The UPS components which contain the equipment and controls necessary to convert
input AC power to regulated DC power required for battery charging and for supplying power to the Inverter.
STATIC TRANSFER SWITCH –The device which connects the critical load to the bypass line when the Inverter
cannot supply continuous power.
BYPASS LINE –The line which conducts electricity directly from the input power source to the critical load during
Maintenance or whenever the UPS is not completely operational.
AC INPUT POWER –Power provided by the electrical utility company, or auxiliary generator, which is connected to
the UPS for supplying the critical load.
BATTERY –The rechargeable battery strings which supply DC power to the inverter to maintain continuous AC power
to the load during AC input power failure conditions.
3.2 OPERATION OVERVIEW
The UPS provides two power paths between the utility source and the critical load.
Figure 3-1 shows the path for normal operation, with the load powered by the inverter.
Figure 3-2 shows the path for bypass operation, with the load supplied through the static bypass line.
Figure 3-3 shows the path for battery operation, with the load powered by the inverter.

G2020 Series UPS Installation and Operation Manual –94861-004 9
3.2.1 Normal Operation: Load power supplied by each system UPS inverter
Figure 3-1 Single Line Diagram –Normal Operation: Load fed by UPS inverter
During normal operation, the path through the UPS inverter is used to power the load.
In Figure 3-1 input AC power is converted to DC by the Converter. DC power is utilized to charge the UPS battery and to
provide power to the Inverter. The Inverter converts the DC power to clean AC power to supply the critical load.
The conversion-inversion process eliminates any voltage transients or fluctuations existing in the input power before it
reaches the critical load.
The power drawn by the critical load is equally shared between all UPS systems when multiple UPSs are in Parallel
Operation. (Refer to Figure 5-5 that shows a sample of Parallel Operation System Configuration.)
When in Parallel Operation, the rectifier inputs to all G9000 UPS Systems in the
Multi-Module System (MMS)-must be fed from a single source at all times including any
operation of Automatic Transfer Switches. All G9000 bypass inputs must also be fed from a
single source at all times (not necessarily the same source as the rectifier inputs).
UPS Module
Power Flow
Not in Use
AC input
CB
CB3
CONVERTER
/ CHARGER
INVERTER
Output
52C
CB1
External
BATTERY
User
supplied
MCCB
Static Transfer
Switch
52S
CB2
Battery Cabinet
Bypass
input
CB
User
supplied
MCCB
CAUTION

10 G2020 Series UPS Installation and Operation Manual –94861-004
In the event of a UPS module failure during Parallel Operation, the critical load power will be continually supplied
and shared by all other UPS.
The Bypass Input breaker and cables are to be supplied and installed by the user or the
contractor. (See WARNING 4 on page 5)
3.2.2 Bypass Operation: Load power supplied through UPS internal static bypass line.
Figure 3-2 Single Line Diagram –Bypass Operation: Load fed through static bypass line
Figure 3-2 shows the Internal Bypass line is a Hard-wired line through 52S which supplies the critical load with
unconditioned bypass input power. Upon switching to the Internal Bypass line, the Static Transfer Switch line through CB3
(herein after STS contactor CB3) supplies the power immediately, and then the Internal Bypass line through 52S supplies
the power. In the event of a switching to the Bypass line, the power to the critical load will be uninterrupted. The purpose of
this Internal Bypass line is to route power to the critical load while the UPS module is de-energized (converter and inverter),
and during Start-up before the system is fully operational.
Each UPS internal static bypass line will equally share the power supplied to the critical load whenever the system is in the
Parallel Operation.
!
NOTE
UPS Module
Power Flow
Not in Use
AC input
CB
CB3
CONVERTER
/ CHARGER
INVERTER
Output
52C
CB1
External
BATTERY
User
supplied
MCCB
Static Transfer
Switch
52S
CB2
Battery Cabinet
Bypass
input
CB
User
supplied
MCCB

G2020 Series UPS Installation and Operation Manual –94861-004 11
In the event of a load overcurrent, the UPS transfers to bypass without interruption to the critical load. In the case of the
Parallel Operation, all UPS will transfer to bypass without interruption to the critical load.
The internal control system determines the operation of the two paths, with the load powered from the inverter being the
normal operation.
3.2.3 Battery operation: Load Power supplied by UPS battery.
Figure 3-3 Single Line Diagram –Battery Operation: Load fed by Battery
Figure 3-3 shows that in the event of AC input source failure or interruption, the UPS Converter(s)* will de-energize and the
UPS battery(s)* will immediately discharge and supply DC power to the Inverter to maintain continuous AC power to the
load. This operation will continue until:
a) The battery capacity expires and the inverter turns off, or
b) Input power is restored. (When input power is restored the converter will simultaneously power the inverter and
critical load, and recharge the batteries.)
A fully charged battery will provide power for the specified time at the rated load, or longer, at a reduced load.
* (s) : In the case of the Parallel Operation
UPS Module
Power Flow
Not in Use
AC input
CB
CB3
CONVERTER
/ CHARGER
INVERTER
Output
52C
CB1
External
BATTERY
User
supplied
MCCB
Static Transfer
Switch
52S
CB2
Battery Cabinet
Bypass
input
CB
User
supplied
MCCB

12 G2020 Series UPS Installation and Operation Manual –94861-004
When power is restored after a low battery shutdown, the UPS response is dependent upon whether it is operating in
standalone (SMS) or parallel (MMS) operation.
Standalone Operation:
After restoration of power, the UPS will automatically restart normal operation: rectifier will resume conversion, the charger
recharges the batteries, and the inverter restarts without operator intervention. Load is automatically assumed by the
inverter without operator intervention.
Parallel Operation:
After restoration of power, the UPS will remain offline until an operator restarts the unit using the startup procedures shown
in Section 5.4 E) MMS Start-up Procedure.
Whenever the system is in Parallel Operation, the power drawn by the load is equally shared between all UPS regardless
of the presence or absence of the UPS that are in battery operation.
3.2.4 Battery Charging Operation
As shown in Section 3.2.1, when the UPS is in normal operation, DC Power is utilized to charge the UPS
batteries. The charging characteristics of the G2020 UPS are shown in Figure 3-4 and descriptions of the two
charging periods are below.
Period (A): Charging voltage increases steadily from its minimum until it reaches the float voltage of the battery
system. During this period, the charging current will be at its maximum. The maximum current is either the
Maximum Recharge Current that the UPS system can provide (see the Battery section of Table 3-5) or a lower
current limit set via the LCD screen to comply with the battery manufacturer recommendations. This current limit
adjustment should only be performed by a Toshiba Authorized Service Provider.
Period (B): This period begins when the Charging Voltage reaches the float voltage of the batteries. The charging
current will steadily decrease as the batteries approach their maximum state of charge. Once reached, the UPS
will maintain the maximum state of charge on the batteries with minimal Charging Current.
Charging Voltage & Current
Charging Time
(A) (B)
Charging Current
0
Charging Voltage
Charging Current Limit
Figure 3-4 Typical Battery Charging Curve