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Huawei UPS2000-G-1KRTS Скачать руководство пользователя страница 42

UPS2000-G-(1 kVA-3 kVA)
User Manual (2016, Russia)

4 Setting Control Panel

Issue 02 (2016-07-28)

Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd.

36

Alarm
ID

Alarm
Cause
ID

Alarm
Name

Alarm
Severity

Alarm
Clear
Mode

Trigger
Condition

Impact on
the System

Repair Proposal

load or replace the
UPS with a UPS
with a larger
capacity.

66

3

Output
overloa
d

Critical

This alarm
must be
manually
cleared.



In
battery
mode,
this
alarm is
generat
ed
when
the load
exceeds
the
rated
load.



In
normal
mode,
when
the
bypass
input is
normal,
this
alarm is
generat
ed
when
the UPS
transfer
s to
normal
mode
three
times
within
20
minutes
after the
UPS
transfer
s from
normal
mode to
bypass
mode.



In
normal



For battery
mode, the
UPS
transfers to
no output
mode.



If the UPS
transfers
from
normal
mode to
bypass
mode three
times
within 20
minutes,
the UPS is
locked in
bypass
mode.



For normal
mode, the
UPS
transfers to
no output
mode.

Possible cause: The
load exceeds the
rated loading
capacity of the
inverter.

Measure: Lower the
load or replace the
UPS with a UPS
with a larger
capacity.

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Содержание UPS2000-G-1KRTS

Страница 1: ...UPS2000 G 1 kVA 3 kVA User Manual 2016 Russia Issue 02 Date 2016 07 28 HUAWEI TECHNOLOGIES CO LTD ...

Страница 2: ... Huawei and the customer All or part of the products services and features described in this document may not be within the purchase scope or the usage scope Unless otherwise specified in the contract all statements information and recommendations in this document are provided AS IS without warranties guarantees or representations of any kind either express or implied The information in this docum...

Страница 3: ... than medical facilities and life support equipment The UPS is of level A It may produce radio interference when being used for residential electricity In this case measures are required to reduce the interference Intended Audience This document is intended for Sales engineers Technical support engineers System engineers Hardware installation engineers Commissioning engineers Data configuration en...

Страница 4: ...lt in equipment damage data loss performance deterioration or unanticipated results NOTICE is used to address practices not related to personal injury Calls attention to important information best practices and tips NOTE is used to address information not related to personal injury equipment damage and environment deterioration Change History Changes between document issues are cumulative The late...

Страница 5: ...3 2 Overview 4 2 1 Model Description 4 2 2 Working Principle 5 2 3 Product Structure 5 3 Installing the UPS 8 3 1 Installation Preparations 8 3 2 Tools 9 3 3 Installing UPS 10 3 4 Installing Cables 11 3 5 Installation Verification 15 4 Setting Control Panel 16 4 1 LCD Panel 16 4 2 Buzzer Alarm Tones 18 4 3 Character Display 19 4 4 Buttons 19 4 5 Setting Parameters 21 4 6 Operating Modes 26 4 7 Ala...

Страница 6: ...ng from Bypass Mode to Normal Mode 42 5 6 Transferring to Battery Self check 42 5 7 Enabling or Disabling the Buzzer 42 5 8 Manually Clearing Alarms 43 5 9 Entering Alarm Cause ID Screen 43 6 Maintenance and Storage 44 6 1 Maintenance 44 6 2 Storage 44 7 Routine Maintenance 45 7 1 UPS Maintenance 45 7 2 Battery Maintenance 46 8 Troubleshooting 51 9 Specifications 53 A Acronyms and Abbreviations 57...

Страница 7: ...rget place Never install the UPS in a damp environment or a place with water nearby Never install the UPS in a place exposed to sunlight or with a heater nearby Never block or shield the air vents on the UPS shell 1 3 Operating Environment Do not place the device in an environment that has inflammable and explosive air or gas Do not perform any operation in this kind of environment Any operation o...

Страница 8: ... to the output socket of the UPS When routing cables keep them away from the place where they are easily to be stepped on or make someone stumble Never connect household appliances such as a hair drier to the output socket of the UPS The power to the UPS must come from a near grounded cushion socket Use only power cables that comply with Verband Deutscher Electrotechniker VDE test standards and Co...

Страница 9: ... the following preventive measures before maintaining batteries Remove any metal objects from yourself such as watches and rings Use only insulated tools When replacing batteries install the batteries of the same quantity and model as the old ones Do not throw batteries into fire which may cause explosion Do not break down or damage batteries The electrolyte will damage your skin and eyes once it ...

Страница 10: ...UPS models Model Represented By Remarks UPS2000 G 1KRTS 1 K standard model rack mounted IEC 1 kVA for short UPS2000 G 2KRTS 2 K standard model rack mounted IEC 2 kVA for short UPS2000 G 3KRTS 3 K standard model rack mounted IEC 3 kVA for short Figure 2 1 shows the UPS model number Figure 2 1 UPS model number Table 2 2 describes the UPS model number Table 2 2 UPS model number details No Item Descri...

Страница 11: ...4 Output capacity Unit VA 1K 1 kVA 2K 2 kVA 3K 3 kVA 5 UPS type RT rack or tower mounted UPS TT tower mounted UPS 6 Built in battery pack optional S standard backup time model which provides only a standard battery pack 2 2 Working Principle Figure 2 2 shows the UPS conceptual diagram Figure 2 2 UPS conceptual diagram 2 3 Product Structure Figure 2 3 to Figure 2 5 show the rear view of the 1 kVA 2...

Страница 12: ...pported 4 RS232 port 5 Optional card slot 6 Output socket C13 7 External battery connector Figure 2 4 Rear view of UPS2000 G 2KRTS 1 Mains input socket C14 2 Input circuit breaker 3 USB port security protection mechanism supported 4 RS232 port 5 Optional card slot 6 Output socket C13 7 External battery connector Figure 2 5 Rear view of UPS2000 G 3KRTS 1 Mains input socket C20 2 Input circuit break...

Страница 13: ...UPS2000 G 1 kVA 3 kVA User Manual 2016 Russia 2 Overview Issue 02 2016 07 28 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 7 7 External battery connector 8 Output socket C19 ...

Страница 14: ...ar away from water sources heat sources and inflammable materials The UPS is free from direct sunlight dust volatile gases corrosive materials and salty air Do not install the UPS in environments with conductive metal scraps in the air The optimal operating temperatures for batteries are 20 30 C Operating temperatures higher than 30 C shorten the battery lifespan and operating temperatures lower t...

Страница 15: ...ces 3 2 Tools Get tools insulated to prevent electric shocks Table 3 1 lists the tools that may be used during installation Table 3 1 Tools Appearance Specifications and Name Clamp meter Multimeter Labels Phillips screwdriver PH2 x 150 mm or PH3 x 250 mm Flat head screwdriver 2 mm x 80 mm Torque screwdriver Crimping tool Diagonal pliers Wire stripper Polyvinyl chloride Cotton cloth Brush ...

Страница 16: ...an be installed on a desk or in a 19 inch rack 1 kVA UPS and 3 kVA UPS need 2 U space separately The installation method for 1 kVA UPS and 3 kVA UPS are the same The figures in this chapter based on the 3 kVA UPS Install the UPS in appropriate mode by performing the following steps Rack mounting a UPS 1 Take out mounting brackets from the fitting bag and install mounting brackets on UPS 2 Install ...

Страница 17: ...rees clockwise on the front panel Reinstall the front panel 4 Assemble support bases The minimum distance between two support bases should be 150 mm 5 Place UPS on the support bases in sequence 6 Adjust the UPS and the support bases to be horizontally Figure 3 3 Tower mounting the UPS Figure 3 4 Tower mounting the UPS 3 4 Installing Cables 1 Connect the UPS output power cable For socket type outpu...

Страница 18: ...Connecting cables to the 2KRTS UPS output Figure 3 7 Connecting cables to the 3KRTS UPS output 2 Connecting battery power cables For details about battery pack installation see the UPS2000 G 1 kVA 3 kVA Battery Pack Quick Installation Guide 2016 Russia The installation method for 1 kVA UPS 2 kVA UPS and 3 kVA UPS are the same The figure below is based on the 3 kVA UPS Figure 3 8 Connecting cables ...

Страница 19: ... strings The battery pack ESS 72V12 9AHBPVBB01 for 3 kVA UPS only contain one group battery strings The 1 kVA UPS is allowed a maximum of one battery pack ESS 24V12 9 3AHBPVBB01 in parallel The 2 kVA UPS is allowed a maximum of one battery pack ESS 48V12 9 2AHBPVBB01 in parallel The 3 kVA UPS is allowed a maximum of three battery packs ESS 72V12 9AHBPVBB01 in parallel 3 Install the optional commun...

Страница 20: ...th the PC over serial data The UPS support either USB or RS232 To monitor the UPS over a PC also need to install the monitoring software iManager NetEco 1000U For details about how to install and use the iManager NetEco 1000U see the iManager NetEco 1000U User Manual The software and the user manual are available at http support huawei com enterprise 5 Connect the UPS input power cable Take out in...

Страница 21: ...ecified torques using a torque wrench connected correctly and free of damage 3 Cable connections for USB ports and network ports Cables to USB ports and network ports are connected correctly and securely 4 Cable labels Labels are neatly attached to both ends of each cable and the information on the labels is concise and understandable 5 Ground cable connection The ground cable is securely connecte...

Страница 22: ...ol Panel 4 1 LCD Panel The control panel is on the UPS front panel The control panel allows you to control and operate the UPS view the running status set parameters and view alarms Figure 4 1 LCD panel Table 4 1 Icon description Icon Function Backup time information Alternately displays the remaining power backup time alarm ID and CF only displays in frequency conversion mode in ...

Страница 23: ...the UPS Output information Displays the output voltage frequency or battery voltage Vac output voltage Hz output frequency output load ratio A output current Load information Displays the current load percentage by level 0 25 Indicator 1 is steady on 25 50 Indicators 1 and 2 are steady on 50 75 Indicators 1 2 and 3 are steady on 75 100 Indicators 1 2 3 and 4 are steady on 100 Indicators 1 2 3 and ...

Страница 24: ...50 75 Indicators 1 2 and 3 are steady on 75 100 Indicators 1 2 3 and 4 are steady on 100 Indicators 1 2 3 and 4 are blink Input voltage information Displays the input voltage frequency battery voltage or input current percentage Vac input voltage Vdc battery voltage Hz input frequency A battery capacity percentage 4 2 Buzzer Alarm Tones Table 4 2 describes the buzzer alarm tones Table 4 2 Buzzer a...

Страница 25: ...sable ESC Escape CF Frequency conversion TP Temperature CH Charging FU Bypass frequency unstable EE EEPROM error VOT Voltage FRE Frequency BVU Bypass overvoltage BVL Bypass undervoltage CAP Capacity DT Discharge time ECO ECO mode VU High voltage VL Low voltage AUT Constant frequency mode BUZ Buzzer off AST Automatic startup 4 4 Buttons The control panel provides three buttons to start and shut dow...

Страница 26: ...meters press ON MUTE for more than 3 seconds Release the button when you hear a beep sound to select the previous option Transferring to battery self check In normal mode ECO mode or frequency conversion mode hold down ON MUTE for more than 5 seconds to enter the battery self check test OFF ENTER Shutting down the UPS Hold down OFF ENTER for over 2 seconds to turn off the UPS in battery mode If th...

Страница 27: ... the input power supply is normal and the UPS is started in normal mode hold down ON MUTE and SELECT both for 5 seconds to enable the UPS enter the bypass mode If the input voltage exceeds the acceptable range or the UPS is in frequency conversion mode the UPS will not enter the bypass mode Bypass mode When the UPS is in bypass mode hold down ON MUTE and SELECT both for 5 seconds to enable the UPS...

Страница 28: ...E for more than 3 seconds Release the button when you hear a beep sound to select the previous option During the setting of UPS parameters press SELECT for more than 3 seconds Release the button when you hear a beep sound to select the next option Press OFF ENTER for more than 3 seconds to confirm the setting The following figures show the twelve parameter setting screens 01 Set the output voltage...

Страница 29: ...he CF frequency conversion mode takes priority over the ECO mode If the CF frequency conversion mode is enabled the ECO mode cannot be enabled 03 Enable or disable the bypass mode Display Setting Enable or disable the bypass function ENA Enables the bypass mode DIS Disables the bypass mode default value 04 Set the highest input voltage in bypass mode Display Setting Press or to adjust and set the ...

Страница 30: ... voltage in bypass mode should be lower than the lowest input voltage in ECO mode 06 Set the battery capacity Display Setting Press or to adjust and set the UPS battery capacity 9 999 Set the UPS battery capacity in the range of 9 Ah to 999 Ah The default value is 9 Ah and up configurable 07 Set the discharge time limit Display Setting Set the backup time limit 0 999 Set the battery backup time in...

Страница 31: ...ode 13 24 Set the parameter based on the preset output voltage The value range is in 13 V AC to 24 V AC The default value is 22 V AC 10 Set the lowest allowable voltage in ECO mode Display Setting Press or to adjust and set the lowest input voltage in ECO mode 13 24 Set the parameter based on the preset output voltage The value range is 13 V AC to 24 V AC The default value is 22 V AC 11 Set the bu...

Страница 32: ...tion Operating Mode Description Display Normal mode When the input voltage is in the acceptable range the UPS works in normal mode supplies stable sine wave AC output current while charging batteries ECO mode When the input voltage is in the preset range the UPS transfers to bypass mode to save energy Frequency conversion mode When the input frequency is in the acceptable range the UPS sets the ou...

Страница 33: ... in normal mode or not enables the bypass mode the UPS works in standby mode in which it only charges batteries but does not deliver output 4 7 Alarm Handing When an alarm that can be manually cleared exists hold down OFF ENTER for over 2 seconds to manually clear the alarm Table 4 6 Alarms Alarm ID Alarm Cause ID Alarm Name Alarm Severity Alarm Clear Mode Trigger Condition Impact on the System Re...

Страница 34: ... the range or wait until the bypass input recovers 14 1 Startup timeou t Critical This alarm must be manually cleared The inverter output voltage is not within 2 V of the rated output If this alarm is generated during the running of the UPS the UPS transfers to bypass mode Possible cause The bypass loading capacity exceeds the rated load of the inverter Measure Reduce the output load manually clea...

Страница 35: ...bles are loose connect them securely 25 1 Battery overvo ltage Critical This alarm must be manually cleared The voltage of each battery exceeds 15 V when the UPS is started This alarm is generated because there are more batteries than required The impact is as follows If battery packs are connected before the startup the UPS fails to start If battery packs are connected during the running of the U...

Страница 36: ...an required The impact is as follows If battery packs are connected before the startup the UPS fails to start If battery packs are connected during the running of the UPS the UPS transfers to bypass mode Possible cause The actual number of batteries does not meet requirements Measure Check that the actual number of batteries meets requirements Possible cause The mains is abnormal and the batteries...

Страница 37: ...ets requirements Possible cause The battery is damaged Measure Contact the dealer or Huawei technical support to replace batteries Minor This alarm is automatic ally cleared The voltage of each battery is lower than 5 V or is higher than 15 V when the UPS is not started The UPS remains in the current state and cannot start 30 1 Interna l overte mperat ure Minor This alarm is automatic ally cleared...

Страница 38: ... Rectify the fault and restart the UPS Possible cause The output supplies power to special loads such as the inductive and rectification loads Measure Check that the load types are supported by the UPS Possible cause The hardware is damaged Measure Contact the dealer or Huawei technical support 42 18 Interna l fault Critical This alarm must be manually cleared The bus voltage is lower than 260 V I...

Страница 39: ...inverter is faulty Measure Contact the dealer or Huawei technical support Interna l fault Critical This alarm must be manually cleared The inverter output voltage is lower than 75 of the rated output voltage and the output current is lower than 60 of the rated output current If this alarm is generated during the running of the UPS the UPS transfers to bypass mode 42 28 Interna l fault Critical The...

Страница 40: ...een the absolute value of the positive bus voltage and that of the negative bus voltage is 100 V If this alarm is generated during the running of the UPS the UPS transfers to bypass mode Possible cause The hardware is damaged Measure Contact the dealer or Huawei technical support Possible cause The UPS supplies power to half wave loads Measure Check that the load types are supported by the UPS 42 ...

Страница 41: ...al support 42 42 Interna l fault Critical This alarm must be manually cleared The voltage of each battery decreases to below 10 V when the charger has no output and the UPS inverter is started The UPS transfers to bypass mode Possible cause The charger switching transistor is faulty Measure Contact the dealer or Huawei technical support 66 1 Output overloa d Minor This alarm is automatic ally clea...

Страница 42: ...alarm is generat ed when the load exceeds the rated load In normal mode when the bypass input is normal this alarm is generat ed when the UPS transfer s to normal mode three times within 20 minutes after the UPS transfer s from normal mode to bypass mode In normal For battery mode the UPS transfers to no output mode If the UPS transfers from normal mode to bypass mode three times within 20 minutes...

Страница 43: ...generat ed when the UPS transfer s to no output mode 66 4 Output overloa d Critical This alarm must be manually cleared The bypass overload exceeds the time limit The UPS transfers to no output Possible cause The load exceeds the rated load of the bypass Measure Reduce the load or replace the UPS with a UPS with a larger capacity 4 8 Alarm Indication Table 4 7 Alarm indication Alarm Display Blinki...

Страница 44: ...A 3 kVA User Manual 2016 Russia 4 Setting Control Panel Issue 02 2016 07 28 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 38 Alarm Display Blinking Buzzer Overcharge Beeps once every second ...

Страница 45: ...e meets the requirements Cables are properly connected between the UPS and batteries Power cables and signal cables are correctly identified Cables are neatly routed and securely bound Devices are installed and cables are routed in ways that facilitate modification capacity expansion and maintenance The UPS is properly grounded The voltage between the neutral wire and the ground cable is less than...

Страница 46: ...in batteries If the 1 kVA UPS needs to connect to external battery strings each battery string must consist of two 12 V batteries connected in series If the 2 kVA UPS needs to connect to external battery strings each battery string must consist of four 12 V batteries connected in series If the 3 kVA UPS needs to connect to external battery strings each battery string must consist of six 12 V batte...

Страница 47: ...the system output frequency based on the rated frequency The values include 50 Hz 60 Hz and AUT default Figure 5 3 Setting the system output frequency 4 Set the battery capacity to the total capacity of all batteries actually connected The default value is 9 Ah for the UPS and the value can range from 9 Ah to 999 Ah Figure 5 4 Setting the battery capacity 5 Start the UPS to inverter mode Hold down...

Страница 48: ...d down OFF ENTER for over 2 seconds to turn off the UPS in battery mode 5 4 Transferring to Bypass Mode When the input power supply is normal and the UPS is started in normal mode hold down ON MUTE and SELECT both for 5 seconds to enable the UPS enter the bypass mode If the input voltage exceeds the acceptable range the UPS will not enter the bypass mode 5 5 Transferring from Bypass Mode to Normal...

Страница 49: ...und to select the previous option During the setting of UPS parameters press SELECT for more than 3 seconds Release the button when you hear a beep sound to select the next option Press OFF ENTER for more than 3 seconds to confirm the setting Button control Hold down ON MUTE for 2 5 seconds when the UPS is in battery mode to enable or disable the buzzer However when the UPS sends a new alarm the m...

Страница 50: ...d to be replaced contact the dealer Hand over used batteries to recyclers or pack them with the package for new batteries and send them to the dealer 6 2 Storage Before storing the UPS charge it for 5 hours The correct way of storing the UPS is standing the UPS without unpacking in a dry place During the storage period maintain the UPS by charging its batteries as follows Table 6 1 UPS charging du...

Страница 51: ...y trained personnel are allowed to perform maintenance Maintain UPSs regularly based on the following requirements Otherwise the UPSs may fail to operate properly and the lifespan may be shortened Table 7 1 Routine maintenance items for UPSs Check Item Expected Result Troubleshooting Maintenance Interval Operating environment Ambient temperature 0 40 C Humidity 0 95 RH non condensing If the humidi...

Страница 52: ... external power distribution equipment The insulation layers of cables are intact and terminals are free from noticeable sparks Replace the cables Secure the output terminals Quarterly Battery self check No battery alarm is generated If an alarm is present rectify the fault Yearly 7 2 Battery Maintenance Before installing batteries read through the battery user manuals and pay attention to safety ...

Страница 53: ...outine maintenance items for batteries Table 7 2 Routine maintenance items for batteries Item Expected Result Measures Maintenance Interval Battery alarm No battery alarm is generated Identify the cause based on the alarm information Monthly Battery appearance 1 The surface is clean and tidy without stains 2 The battery terminals are intact 3 Batteries are free from damage and cracks 4 Batteries a...

Страница 54: ...f the battery string voltage check whether the cable between the battery string and the UPS is excessively long or the cable diameter is excessively small 2 Check whether the equalized charging voltage and float charging voltage are correctly set for the UPS 3 If the fault persists contact Huawei technical support Monthly Battery temperature sensor measurement accuracy The difference between the t...

Страница 55: ...1 V 1 Check whether the equalized charging voltage and float charging voltage of a battery are normal 2 If the charging voltage of a battery exceeds the specifications requirement perform a complete forcible equalized charging for the battery and check again whether the voltage is normal 3 If the fault persists contact Huawei technical support Quarterly Shallow discharge test recommended Conduct a...

Страница 56: ...minal is connected reliably When battery strings are powered off check the reliability of each terminal in the order from positive terminals to negative terminals 2 The tightening torque of each battery screw meets the requirements of the battery manufacturer A torque wrench is used for checking the torque After checking that the battery screws meet the requirements mark the screws for later check...

Страница 57: ... LCD and the buzzer beeps once every second The external or internal batteries are incorrectly connected Check that all batteries are connected correctly and blink on the LCD and the buzzer beeps twice every second The UPS is overloaded Remove surplus load from the UPS output end The UPS is overloaded and supplying power to devices in bypass mode Remove surplus load from the UPS output end The UPS...

Страница 58: ...ng Issue 02 2016 07 28 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 52 Symptom Possible Cause Measures specifications or Huawei technical support Batteries are faulty Contact the dealer or Huawei technical support to replace batteries ...

Страница 59: ...erature is 35 40 C 175 155 135 125 V AC tolerance 5 Ratio of actual load to rated load 100 80 80 70 70 60 60 0 Lowest recovery voltage When the ambient temperature is 0 35 C 175 155 135 125 V AC tolerance 5 Ratio of actual load to rated load 100 80 80 70 70 60 60 0 When the ambient temperature is 35 40 C 190 170 150 140 V AC tolerance 5 Ratio of actual load to rated load 100 80 80 70 70 60 60 0 Hi...

Страница 60: ...30 150 The UPS automatically shuts down in battery mode or transfers to bypass mode in line mode after 3 seconds 150 The UPS automatically shuts down in battery mode or transfers to bypass mode in line mode after 0 5 seconds max When the ambient temperature is 35 40 C 105 110 The UPS automatically shuts down in battery mode or transfers to bypass mode in line mode after 5 minutes 110 130 The UPS a...

Страница 61: ...zed charging voltage 28 3 V DC 1 56 6 V DC 1 84 9 V DC 1 Backup time Depending on the capacity of external batteries for details see Table 9 2 Appearance Standard model Dimensio ns H x W x D 88 mm x 438 mm x 310 mm 88 mm x 438 mm x 410 mm 88 mm x 438 mm x 630 mm Net weight 10 7 kg 18 5 27 9 kg Environment Operating Temperature 0 40 C Storage Temperature 40 C to 70 C battery pack 20 C to 40 C Altit...

Страница 62: ...y packs for one UPS 100 N A N A 17 5 75 N A N A 28 5 50 N A N A 47 0 25 N A N A 104 0 One internal battery string three external battery packs for one UPS 100 N A N A 27 0 75 N A N A 41 5 50 N A N A 68 0 25 N A N A 141 0 The battery pack ESS 24V12 9 3AHBPVBB01 for 1 kVA UPS contain three group battery strings The battery pack ESS 48V12 9 2AHBPVBB01 for 2 kVA UPS contain two group battery strings T...

Страница 63: ... A Acronyms and Abbreviations C CE ConformitéEuropé enne E ECO economy control operation EEPROM electrically erasable programmable read only memory H HTTP HTTP Hypertext Transfer Protocol L LCD liquid crystal display P PFC power factor correction R RS232 Recommend Standard 232 S SNMP Simple Network Management Protocol T THDv total harmonic distortion of output voltage ...

Страница 64: ...PS2000 G 1 kVA 3 kVA User Manual 2016 Russia AAcronyms and Abbreviations Issue 02 2016 07 28 Huawei Proprietary and Confidential Copyright Huawei Technologies Co Ltd 58 U UPS uninterruptible power system ...

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