Emerson GXT-RT series User manual

GXT RT Series 1-3 kVA UPS
User Manual
Version: V1.11
Revision date: Sept 21, 2005
Emerson Network Power provides customers with technical support. Users may contact the nearest
Emerson local sales office or service center.
While every precaution has been taken to ensure accuracy and completeness in this manual,
Emerson Network Power assumes no responsibility and disclaims all liability for damages resulting
from use of this information or for any errors or omissions.
Emerson Network Power pursues a policy of continuous product development and reserves the
right to change the equipment design without notice.
Copyright © 2005 by Emerson Network Power
All rights reserved. The contents in this document are subject to change without notice

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Contents
Safety Instructions............................................................................ 3-4
Description of Commonly used Notations.............................................5
1 Product Description ........................................................................6
1.1 Features...................................................................................6
1.2 System Components ...............................................................6
1.2.1 Power Module...................................................................6
1.2.2 Battery Module..................................................................8
1.3 System Type And Configuration ..............................................9
1.4 Operating Principle ................................................................10
1.5 Communication......................................................................11
2 Installation.....................................................................................12
2.1 Unpacking Inspection ............................................................12
2.2 Installation Notes ...................................................................12
2.3 Tower Installation ...................................................................13
2.3.1 Installing Single Power Module.......................................13
2.3.2 Installing Power Module Plus Battery Module.................13
2.4 Rack Installation ....................................................................14
2.4.1 Installing Single Power Module.......................................14
2.4.2 Installing Power Module Plus Battery Module.................15
2.5 Cable Connection ..................................................................15
2.5.1 Connecting Battery Cable...............................................15
2.5.2 Connecting Input And Output Cables..............................16
2.5.3 Connecting Communication Cable .................................16
3 Operation......................................................................................18
3.1 Operator Control And Display Panel......................................18
3.2 Operation Mode .....................................................................20
3.3 Operating Instructions............................................................20
3.3.1 Turning On And Completely Powering Down The UPS ..20
3.3.2 Conducting Battery Test..................................................21
4 Maintenance .................................................................................22
4.1 Battery Maintenance..............................................................22
4.2 Replacing Output Fuse ..........................................................22
4.3 Checking UPS Functions.......................................................22
4.4 Troubleshooting .....................................................................23
5 Specifications................................................................................25
5.1 Mechanical.............................................................................25
5.2 Electrical ................................................................................25
5.3 EMS .......................................................................................26
5.4 EMI ........................................................................................27
5.5 Environmental........................................................................27
5.6 Safety.....................................................................................27
Table of Contents

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Safet
y
Instructions
SafetyInstructions
Caution - risk of electric shock. Even after the unit is disconnected from the mains power supply
(building wiring socket outlet), components inside the UPS system are still connected to the
battery and are still electrically live and dangerous.
Before carrying out any kind of servicing and/or maintenance, disconnect the batteries and
verify that no current is present and no hazardous voltage exists in the terminals of high
capacity capacitors such as BUS-capacitors
•As dangerous voltages are present within the UPS, only an Emerson technician or an
Emerson-authorized technician is permitted to open it. Failure to observe this could
result in electric shock risk and invalidation of any implied warranty.
•When the UPS is purchased to deliver power to the equipment listed below, please
discuss with the Emerson or Emerson Authorized Representative in advance about the
applicability, settings, management and maintenance of the UPS.
•The Liebert GXT-RT has been designed for Commercial/Industrial use only, and is not
recommended for use in life support applications
•Never dispose of the battery in a fire, as it may explode when exposed to flame.
•Do not apply pure inductive load to the UPS.
•The UPS has its own energy source (i.e., a battery), therefore the output terminal of the
UPS may carry live voltage even when the UPS is not connected to the AC mains.
•Before moving or re-wiring the UPS, please disconnect the mains source and make
sure the UPS is completely shut down. Otherwise the output terminal may carry live
voltage, presenting risk of electric shock.
•To ensure safety and normal operation, the UPS must be solidly and adequately
grounded before use.
•The operating environment and storage method are two main factors affecting the
lifetime and reliability of the UPS. Hence, it is advisable not to use the UPS for longer
periods in the following environments:
•Places where the temperature and relative humidity are outside the
specifications (specified temperature: 0°C~40°C, specified relative humidity:
5%~95%);
•Places where vibrations or shocks exist;
•Places which are dusty, strewn with corrosive substances or salts or where
flammable gases are present.
•Verify that the cabling and battery cable polarity are correct before switching on the
UPS.
•The external battery must be fitted with an appropriate overcurrent protection device.
•The UPS installation must be firm and solid. The AC input socket that feeds the UPS
should be located near the UPS, and easy to access.

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Instructions
•In case of fire, use dry chemical fire extinguisher to put out the fire. Using foam fire
extinguisher may cause electric shock.
•High ambient temperature shortens the battery’s lifetime, so the battery should be
monitored & maintained periodically and if required should be replaced. This is to
ensure normal UPS operation and adequate autonomy time. Only an
Emerson-authorized technician is permitted to replace the battery. In replacement of
battery or battery module, please use the same model and number of battery or battery
module.
•It is recommended to place battery at a place with controlled ambient temperature. The
rated battery performance is available at 25 degree Celsius.
•Do not open or damage the battery, as the battery electrolyte is harmful to the eyes and
the skin. If electrolyte comes into contact with the skin, wash the affected area with
plenty of clean water and seek emergency medical assistance immediately

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Commonly Used Notations
Description of commonly used notations
Some or all of the following Notations may be used in this manual and may appear in your application
process. Therefore, all users should be familiar with them and understand their explanations.

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Product Introduction
Product Introduction
The GXT-RT series 1~3kVA UPS is an online UPS with a sine wave output, and is developed by
Emerson Network Power.
The GXT-RT provides highly efficient and reliable AC Power for your sensitive equipment.
The GXT-RT adopts a modular design. Rack installation and tower installation can be used depending
on the user’s requirements. It is an ideal product for applications that require small footprint, like
communication stations and data machine rooms.
1.1 Features
Product features include:
z2U thick.
zExceptional electrical performance, with an on-line efficiency up to 88%.
zHigh system reliability, self-protection and fault diagnosis are achieved using the advanced DSP-based
full digital control technology.
zThe system adopts a high-frequency, double conversion topology structure to achieve a high input
power factor up to 0.99, greatly reducing its contamination to the power grids.
zWith a wide range of input voltages, and an output immune to the mains interference, the product is
suitable even for areas with unstable mains power supply. It is an environmentally efficient energy
source.
zWith a wide range of input frequencies, the product can be well connected to the generator output.
zLong Back up model has built-in large charger to satisfy users’ demand for extended battery back-up
time.
1.2 System Components
Power module and battery module are the basic components of GXT RT series UPS. The
former performs power conversion, provides AC output for load and charges the battery, while
the latter provides DC power for the UPS.
1.2.1 Power Module
Types and models
There are two types of power module: standard type and extended back-up time type, each
available in the following ratings: 1kVA, 2kVA and 3kVA.
The power module types and models appear from Table 1-1. Users can confirm the module
model by checking the nameplate on the enclosure.

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Product Introduction
Product Introduction
Table 1-1 Power module types and models
Type Module name Model Remark
1kVA standard power module GXT1000-RT With a 1A internal charger and
a 3*12V/7.2Ah internal battery
2kVA standard power module GXT2000-RT With a 1A internal charger
Standard
3kVA standard power module GXT3000-RT With a 1A internal charger
1kVA extended back-up time
power module GXT1000L-RT With a 7A internal charger
2kVA extended back-up time
power module GXT2000L-RT With an 8A internal charger
Extended back-up
time
3kVA extended back-up time
power module GXT3000L-RT With an 8A internal charger
Front panel appearance
All models of power modules have the same front panel, which provides ON/Alarm silence
button, OFF button and LED indication, as shown in Figure 1-1.
Figure 1-1 Front panel of power module
Rear panel appearance
The power module’s rear panel differs with the model, as shown in figures from 1-2 to 1-6. The
rear panel provides AC input socket, AC input overcurrent protection switch, output socket,
output fuse and output terminal block (3kVA power modules only), external battery socket
(except for 1kVA standard power module), DB9 communication port and SNMP card slot.
Figure 1-2 Rear panel of 1kVA standard power module
Figure 1-3 Rear panel of 1kVA extended back-up time power module

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Product Introduction
Figure 1-4 Rear panel of 2kVA standard power module
Figure 1-5 Rear panel of 2kVA extended back-up time power module
Figure 1-6 Rear panel of 3kVA power modules
1.2.2 Battery Module
Model
The battery packs are available in two modules: GXT2000-BAT and GXT3000-BAT, as shown in
Table 1-2. Users can confirm the module model by checking the nameplate on the enclosure.
Table 1-2 Battery module models
Module name Model Remark
72V/7.2Ah battery module GXT2000-BAT 72V, with a 6*12V/7.2Ah internal battery
72V/9.0Ah battery module GXT3000-BAT 72V, with a 6*12V/9Ah internal battery
Front panel and rear panel appearances
The GXT2000-BAT and GXT3000-BAT battery modules have the same front panel and rear
panel, as respectively shown in Figure 1-7 and Figure 1-8.
Figure 1-7 Front panel of battery module

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Product Introduction
Figure 1-8 Rear panel of battery module
1.3 System Type And Configuration
The above mentioned power modules and battery modules can comprise two types of UPS
system: standard type and extended back-up time type, each available in the following ratings:
1kVA, 2kVA and 3kVA UPS.
The UPS types and configurations appear from Table 1-3.
Table 1-3 UPS types and configurations
Configuration
UPS type Module Model Qty. Remark
1kVA standard UPS Power
module GXT1000-RT 1 The UPS has only one power module
Power
module GXT2000-RT 1
2kVA standard UPS Battery
module GXT2000-BAT 1
Power
module GXT3000-RT 1
Standard
3kVA standard UPS Battery
module GXT3000-BAT 1
The UPS consists of a
power module and a
battery module
1kVA extended
back-up time UPS
Power
module GXT1000L-RT 1
2kVA extended
back-up time UPS
Power
module GXT2000L-RT 1
Extended
backup
time 3kVA extended
back-up time UPS
Power
module GXT3000L-RT 1
External battery is
needed and should be
provided by users.
Emerson battery and
battery cabinet are
recommended

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Product Introduction
1.4 Operating Principle
The UPS operating principle is shown in Figure 1-9.
Figure 1-9 UPS schematic block diagram
The UPS comprises AC input, input filter (EMI and Class D Surge Protecting Device),
rectifier/PFC (power factor correction), DC/DC converter, inverter, bypass, internal charger,
battery and UPS output functional modules. The UPS uses DSP (digital signal processor) and
IGBT (insulated gate bipolar transistor) to ensure satisfactory performance and increase the
product reliability.
AC input: contains AC input socket and input overcurrent protection switch.
Input filter: contains EMI suppression filter and Class D SPD. It provides clean AC power to
the UPS.
Rectifier/PFC: an important front-end processing functional module of the UPS. In Normal
mode, the rectifier/PFC circuit converts the AC input power to regulated DC power, while
ensuring that the wave shape of the input current used by the UPS is near ideal.
DC/DC converter: it raises the DC voltage from the battery system to the optimum operating
voltage for the inverter when the UPS operates in Battery mode.
Inverter: an important back-end processing functional module of the UPS. In Normal mode, the
inverter utilizes the DC output of the PFC circuit and inverts it into precise, regulated sinewave
AC power. In Battery mode, the inverter receives its required energy from the battery through
the DC/DC converter.
Bypass: this module plays a very important role in enhancing the UPS reliability. In the event
of an UPS fault that will not lead to UPS shutdown, such as an over-temperature condition,
rectifier fault, inverter fault, the load will be automatically transferred to the bypass. In the
meantime, the LED indicators will indicate the fault type, and the fault information will be
reported through the communication ports.
Internal charger: the internal charger of GXT1000-RT, GXT2000-RT and GXT3000-RT
standard power modules provides 1A charging current; that of GXT1000L-RT extended
back-up time power module provides 7A charging current; and that of GXT2000L-RT and
GXT3000L-RT extended back-up time power modules provides 8A charging current.
Battery: Sealed maintenance-free lead-acid battery is used as the DC source of the UPS.
UPS output: this module contains output EMI suppression filter and provides multiple AC
outputs for load.
Output Filte
r
Bypass
DC/DC
Battery
Input filter
Internal
charger
Input Output
Inverter
Rectifier
/PFC
GG

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Product Introduction
1.5 Communication
The UPS provides a DB9 port and an SNMP card slot located on the rear panel of the power
module (see figures from 1-2 to 1-6).
DB9 port
The DB9 can be used for RS232 serial communication and dry contact communication. Users
can use the accessory UPS monitoring software to monitor the UPS through the DB9 port.
SNMP card slot
The SNMP card slot is designed for installing the SNMP card option, which enables users to
monitor the UPS over network. It is also used for auto-shut down of computers in a network.
Please consult Emerson representative for detailed monitoring options that are available for
this UPS product.

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Chapter 2 Installation
2.1 Unpacking Inspection
1. Open the packing box of each module and take out the modules, visually examine the
modules for possible transit damage.
2. Check against the accessory lists (see tables 2-1 to 2-2) if the accessories of the power
module and battery module are present.
3. If the UPS arrives damaged, or if there is any missing accessory, please contact the
distributor immediately.
Table 2-1 Power module accessory list
Accessory Quantity Unit
Tower installation fittings —— plastic support base 4 Pcs
Rack installation fittings —— bracket 1 Pair
AC input cable 1 Pcs
Battery connection cable (as applicable) 1 Pcs
RS232 cable 1 Pcs
User manual 1 Pcs
Single UPS monitoring software CD 1 Pcs
Note:
1. The rated current of the AC input cable of GXT1000-RT, GXT1000L-RT and GXT2000-RT power modules is
10A. That of GXT2000L-RT, GXT3000-RT and GXT3000L-RT power modules is 16A.
2. Only long back-up time power modules are delivered with a battery connection cable--a 1.8m long cable with
OT terminals attached to one end and a connector attached to the other, which is a 3-pin one for GXT1000L-RT
module and a 5-pin one for GXT2000-RT and GXT3000L-RT modules.
Table 2-2 Battery module accessory list
Accessory Quantity Unit
Tower installation fittings —— plastic middle base 2 Pcs
Rack installation fittings —— bracket 1 Pair
Battery cable with a 5-pin connector attached to each end 1 Pcs
2.2 Installation Notes
1. When locating the UPS, make sure there is no hazardous objects around the UPS, and that
the installation environment meets the specifications (see section 5.5).
2. The UPS is cooled with the aid of the internal fan fitted in the back of the power module. A
clearance of at least 300mm should be maintained behind the power module to facilitate
adequate ventilation and heat dissipation.
3. When adopting rack installation, the UPS must be installed in a standard 19-inch equipment
rack at least 400mm deep. The user should provide the installation fittings and screws in the
rack.

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2.3 Tower Installation
2.3.1 Installing Single Power Module
Use the following steps to install the UPS systems that contain only one power module and no
battery module. These power modules include GXT1000-RT, GXT1000L-RT, GXT2000L-RT
and GXT3000L-RT.
1. Take out a pair of support bases delivered with the power module, snap it up in the direction
shown in the left figure below to make a base, and put it down flat on the installation surface, as
shown in the right figure below; likewise, make another base using another pair of support
bases, and put it down flat on the installation surface.
Figure 2-1 Making base
2. As shown in the left figure below, move the two bases to appropriate positions, and put the
power module gently down on the bases; then push the power module gently in the directions
shown in the right figure below to position it evenly on the two bases.
Figure 2-2 Positioning power module
2.3.2 Installing Power Module Plus Battery Module
Use the following steps to install the standard UPS systems that contain a power module and a
battery module (i.e., GXT2000-RT plus GXT2000-BAT; and GXT3000-RT plus GXT3000-BAT).
1. Take out a pair of support bases delivered with the power module, and a support base
extension delivered with the battery module, use step 1 in section 2.3.1 to fit them together
to make a base, and put it down flat on the installation surface, as shown in Figure 2-3;
likewise, make another base and put it down flat on the installation surface.
Figure 2-3 Making base

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2. Use step 2 in section 2.3.1 to put the power module and battery module on the bases, with
the power module in the right position to facilitate cable connection, as shown in Figure 2-4.
Figure 2-4 Positioning modules
2.4 Rack Installation
2.4.1 Installing Single Power Module
Use the following steps to install the UPS systems that contain only one power module and no
battery module. These power modules include GXT1000-RT, GXT1000L-RT, GXT2000L-RT
and GXT3000L-RT.
1. Take out the pair of brackets delivered with the power module; remove the four flat screws
M4*8 on both sides of the module, as shown in Figure 2-5; and fix the brackets onto both sides
of the module using the flat screws, as shown in Figure 2-6.
Figure 2-5 Removing flat screws
Figure 2-6 Installing brackets
2. Place the power module onto the slide rail in the rack in the direction shown in the following
figure, and push it into place along the slide rail. Fix the module onto the rack using four screws
(provided by the user), as shown in the figure below.
Figure 2-7 Installing power module

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2.4.2 Installing Power Module Plus Battery Module
Use the following steps to install the standard UPS systems that contain a power module and a
battery module (i.e., GXT2000-RT plus GXT2000-BAT; and GXT3000-RT plus GXT3000-BAT).
1. Take out a pair of brackets respectively delivered with the power module and battery module,
use step 1 in section 2.4.1 to fit the brackets onto both sides of the two modules.
2. Use step 2 in section 2.4.1 to install the power module and battery module on the rack one
by one, with the power module in the lower position to facilitate cable connection, as shown in
Figure 2-8.
Figure 2-8 Installing modules
2.5 Cable Connection
2.5.1 Connecting Battery Cable
Battery cable connection is required for long back-up time UPS systems and standard UPS
systems that contain a power module and a battery module.
Power module plus battery module system
Take out the battery connection cable delivered with the battery module, plug one end of the
cable into the external battery socket on the rear panel of the power module, and the other end
into any battery socket on the rear panel of the battery module.
Long back-up time system
Warning
1. Batteries have represent a potentially dangerous source of energy. Only professionals shall make
battery cable connection for long back-up time UPS systems.
2. The external battery voltage must comply with the power module’s requirements on external
battery voltage (see section 5.2).
Use the following steps to connect the battery cable for the long back-up time UPS.
1. Open the battery breaker.
2. Take out the battery cable delivered with the power module, (a plug at one end and three OT
terminals at the other).
3. Connect the three OT terminals respectively labeled “+”, “-” and “G” to the battery’s positive
terminal, negative terminal and the PE terminal of the battery cabinet (refer to the Battery
Cabinet User Manual) respectively.
4. Plug the battery cable into the external battery socket on the rear panel of the power module.

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Note
The external battery cable delivered with the long back-up time power module is 1.8m long. If
users need a longer one, please consult the distributor. There is a limit to the length of the
external battery cable to ensure normal operation of the UPS.
2.5.2 Connecting Input And Output Cables
Warning
1. The max output current of each load output shall not exceed the current marked by
screenprint at the output sockets and output terminal block, the total output power shall not
exceed 0.7kW for 1kVA UPS, 1.4kW for 2kVA UPS, and 2.1kW for 3kVA UPS.
2. Make sure that the input plug and load plug match the power module’s input socket and
output socket respectively.
3. Non-professionals shall not make cable connection to the output terminal block at the rear
panel of the 3kVA power module; when connecting load cable to the output terminal block,
make sure that the neutral line and live line are not reversed connected.
Connect the input cable between the user’s mains socket and the input socket of the power
module, and insert the load plug into the output socket of the power module.
2.5.3 Connecting Communication Cable
DB9 communication port
Where users need to use the single UPS monitoring software delivered with the power module
to monitor the UPS, in communication cable connection, just locate the RS232 cable delivered
with the power module, and insert the two cable plugs respectively into the RS232 port of the
computer and the DB9 port at the rear panel of the power module.
The DB9 port can be used for dry contact communication as well as RS232 serial
communication. Its pin assignment is shown in Figure 2-9, the pin description appears from
Table 2-3, and its dry contact port principle is shown in Figure 2-10.
Figure 2-9 DB9 port’s pin assignment
Table 2-3 DB9 port’s pin description
Pin Description Remark
1, 7 Low Battery (output dry
contact)
2 UPS RxD (RS232 standard)
3 UPS TxD (RS232 standard)
4, 5 Remote Inverter Off in Battery
Mode
5 Common GND
6 NC
8, 9 On Battery (output dry contact)
1. Pin1, Pin7 dry contact output: open
when the battery voltage is normal,
shorted when the battery voltage is low.
2. Pin9, Pin8 dry contact output: open
when the UPS is not on battery, shorted
when the UPS is on battery.
3. Pin4, Pin5 dry contact input: in Battery
mode, when at high level (5~12Vdc, for
more than 20s), the UPS is turned off;
when open or at low level input, the UPS
maintains the original state.

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Note
The input signal current shall not exceed 10mA, the output dry contact voltage shall not exceed
30Vdc.
R
Dry contact signal input
Dry contact signal output
Common GND
Open emitter
Open collector
OFF level input
Figure 2-10 Dry contact port schematic diagram
SNMP card slot
For those that use the SNMP card to monitor the UPS, please refer to the SNMP Card User
Manual for the SNMP card installation and communication connection instructions.

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p
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Control Button 2:
OFF button
Control Button 1:
ON/Alarm Silence
button
Chapter 3 Operation
3.1 Operator Control And Display Panel
Figure 3-1 shows the operator control and display panel of the power module, which provides
ten LED indicators and two control buttons: ON/Alarm silence button and OFF button.
Figure 3-1 Operator control and display panel of power module
Control buttons
Control Button 1: ON/Alarm silence button
The ON/Alarm silence button provides the following three functions:
1) Turn on the inverter: Pressing and holding the ON/Alarm silence button for one second can
turn on the inverter.
2) Silence the audible alarm in Battery mode: In Battery mode, when the buzzer beeps every
3.3s, pressing and holding the ON/Alarm silence button for one second can silence the buzzer.
3) Initiate battery test: In Normal mode, pressing and holding the ON/Alarm silence button for
one second can initiate the battery test.
Note
The alarm silencing function of the ON/Alarm silence button is valid only for the one beep per
3.3s audible alarm in Battery mode, and invalid for any other UPS audible alarms.
Control Button 2: OFF Button
The OFF button provides the following two functions:
1) Turn off the inverter: in Normal mode or Battery mode, pressing and holding the OFF button
for one second can turn off the inverter.
2) Transfer the UPS to Standby state: in Bypass mode, pressing and holding the OFF button
for one second can turn off the bypass output and transfer the UPS to Standby state.
LED indicators
The indications of the BATTERY indicator, INVERTER indicator, BYPASS indicator, LINE
indicator and ALARM indicator are described in Table 3-1.

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Table 3-1 LED indication
BATTERY indicator (green)
It illuminates when the UPS is on battery and the
battery voltage is not too high, flashes when the
battery is faulty or the charging voltage is too high
INVERTER indicator (green) It illuminates when the inverter is in normal operation,
flashes when the inverter is faulty
BYPASS indicator (green) It illuminates when the UPS is on bypass.
LINE indicator (green) It illuminates when the mains input is normal, flashes
when abnormal, and goes off when it fails
ALARM indicator (red) It is on in the event of a UPS fault, off otherwise.
The buzzer and the ten indicators combine to indicate the UPS operating status and faults, as
illustrated in Table 3-2:
Table 3-2 Audible alarm and LED indication of UPS operating status and fault s
LED number (identified in Figure 3-1)S/
N Operating status 1 2 3 4 5 6 7 8 9 10 Audible alarm
1 0%~25% load
●●●None
2 26%~50% load
●●●●None
3 51%~75% load
●●●●●None
4 76%~100% load
●●●●●●None
5 101%~105% load
●●●●●●●None
6
Normal
mode
>105% load ●●●●●●●Twice every 1s
7 0%~25% battery
capacity ●
●●Once every 1s
8 26%~50% battery
capacity ●●
●●Once every 3.3s
9 51%~75% battery
capacity ●●●
●●Once every 3.3s
10 76%~95% battery
capacity ●●●●
●●Once every 3.3s
11 >96% battery
capacity ●●●●●
●●Once every 3.3s
12
Battery
mode
>105% load
●●Twice every 1s
13 Shortcircuit fault ●
●Continuous
14 Charger fault ●
●Continuous
15 Overheating fault ●
●Continuous
16 Fan failure
●●Once every 1s
17 Rectifier fault
●●Continuous
18 Inverter fault ●¤Continuous
19 Inverter overload ●●●●●●Continuous
20 Battery overcharge
(in Normal mode) ●●¤None
21 Battery overcharge (in Standby
state)
¤None
22 No battery ●¤6 times
●ON; depending on other conditions; ¤Flash
Note
LED 1 is yellow, LED 6 is red, others are green.

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eration
3.2 Operation Mode
The UPS can be considered to be in the following operation modes:
Normal mode
When the input mains voltage is within the specifications, the load is supplied by the inverter,
which draws power from the rectifier; meanwhile, the charger charges the battery. When in
Normal mode, the LINE indicator and INVERTER indicator on the operator panel are on.
Bypass mode
In the event of an overload, inverter fault, overheating or rectifier fault condition during Normal
mode, the UPS will transfer to Bypass mode. In Bypass mode, the load is supplied by the
bypass AC source, which comes directly from the AC mains input; meanwhile, the charger
charges the battery. When the UPS works in Bypass mode, the LINE indicator and BYPASS
indicator are on, the INVERTER indicator is off.
Note
1. If the UPS transfers from Normal mode to Bypass mode three times within twenty minutes
due to overload, it will remain in Bypass mode afterwards whether the overload condition is
removed or not.
2. In the event of a mains failure or mains voltage/frequency outside the specifications when
the UPS is in Bypass mode, the UPS will shut down and cease supplying power to the load.
Battery mode
In the event of a mains failure or mains voltage/frequency outside the specifications when the
UPS is in Normal mode, the rectifier and charger will become inoperative and the battery will
begin to discharge and supply the load through the inverter. When the UPS is in Battery mode,
the BATTERY indicator and the INVERTER indicator are on.
Note
In the event of an inverter fault, internal overheating or other fault conditions in Battery mode,
the inverter will become inoperative.
3.3 Operating Instructions
3.3.1 Turning On And Completely Powering Down The UPS
Note
The battery is fully charged before delivery. However, storage and transportation will inevitably
cause some charge loss. Therefore, it is advisable to charge the battery for 8 hours before
using it, so as to ensure adequate battery autonomy.
Turning on the UPS
Users can use the following two methods to turn on the UPS:
1. Connect the mains input to the UPS, and manually turn on the UPS into Normal mode
Connect the mains input to the UPS, press and hold the ON button for one second until the
buzzer beeps. At this point, the UPS begins to conduct self-test. Seconds later, the UPS will