KEHUA TECH MR33120 User manual

Uninterruptible Power Supply MR33120
User Manual

All rights reserved ©Kehua Data Co., Ltd.
i
Copyright © Kehua Data Co., Ltd. 2021.All rights reserved.
No part of this document may be reproduced or transmitted in any form or by any means without prior
written consent of Kehua Data Co., Ltd.
Trademarks and Permissions
and other Kehua trademarks are trademarks of Kehua Data Co., Ltd.
All other trademarks and trade names mentioned in this document are the property of their respective
holders.
Notice
The purchased products, services and features are stipulated by the contract made between Kehua 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 specification 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 document is subject to change without notice. Every effort has been made in the
preparation of this document to ensure accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or implied.
KEHUA DATA CO.,LTD.
Address:
No.457,MalongRoad,TorchHigh-TechIndustrialZone,Xiamen,Fujian,China
Website:
www.kehua.com
E-mail:
[email protected]
Customer Service Telephone:
400-808-9986
Tel:
0592-5160516
Fax:
0592-5162166

Foreword
Uninterruptible Power Supply MR33120
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
Foreword
Summaries
Thank you for choosing the UPS!
This document gives a description of the MR33120, including the features, performance, appearance,
structure, working principles, installation, operation and maintenance, etc.
Please save the manual after reading, in order to consult in the future.
The figures in this manual are just for reference, for details please see the actual product.
Suitable Model
MR33120
Symbol Conventions
The manual quotes the safety symbols, these symbols used to prompt users to comply with safety
matters during installation, operation and maintenance. Safety symbol meaning as follows.
Symbol
Description
Alerts you to a high risk hazard that could, if not avoided, result in
serious injury or death.
Alerts you to a medium or low risk hazard that could, if not
avoided, result in moderate or minor injury.
Alerts you to a potentially hazardous situation that could, if not
avoided, result in equipment damage, data loss, performance
deterioration, or unanticipated results.
Anti-static prompting.
Be care electric shock prompting.

Uninterruptible Power Supply MR33120
User Manual
Foreword
All rights reserved ©Kehua Data Co., Ltd.
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Symbol
Description
Provides a tip that may help you solve a problem or save time.
Provides additional information to emphasize or supplement
important points in the main text.
Product standard: Q/ZZKJ 007

Contents
Uninterruptible Power Supply MR33120
User Manual
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All rights reserved ©Kehua Data Co., Ltd.
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
1.1.1 Safety Instructions ..................................................................................................................................1
1.1.2 Use Announcements for Battery.............................................................................................................4
1.1.3 ESD Protection........................................................................................................................................5
1.1.4 Grounding Requirements........................................................................................................................5
1.1.5 Warning Mark Setting.............................................................................................................................5
1.2 Operation and Maintenance Requirements ......................................................................................................5
1.3 Environment Requirements..............................................................................................................................7
2 Overview.........................................................................................................................................8
2.1 Product Intro.....................................................................................................................................................8
2.1.1 Model Meaning.......................................................................................................................................8
2.2 Features............................................................................................................................................................9
2.3 Working Principle........................................................................................................................................... 11
2.3.1 Schematic Diagram............................................................................................................................... 11
2.3.2 Working Mode ...................................................................................................................................... 11
2.4 Appearance and Structure...............................................................................................................................13
2.4.1 Appearance............................................................................................................................................13
2.4.2 Structure Layout....................................................................................................................................15
2.5 Optional Accessory ........................................................................................................................................23
2.5.1 SNMP Card and Its Software................................................................................................................24
2.5.2 Expansion Card.....................................................................................................................................26
2.5.3 Parallel/BSC Accessory ........................................................................................................................29
2.5.4 Battery Temperature Sampling Accessory ............................................................................................30

Uninterruptible Power Supply MR33120
User Manual
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2.5.5 Surge Protection Device........................................................................................................................30
2.5.6 Top Wiring Accessory...........................................................................................................................30
2.5.7 Battery Tripper Control Accessroy........................................................................................................31
2.6 Alarm Function...............................................................................................................................................31
3 Installation....................................................................................................................................41
3.1 Installation Process.........................................................................................................................................41
3.2 Installation Preparation ..................................................................................................................................42
3.2.1 Installation Tools...................................................................................................................................42
3.2.2 Installation Environment.......................................................................................................................43
3.2.3 Installation Clearance............................................................................................................................44
3.2.4 Input and Output Wire Selection...........................................................................................................44
3.3 Transporting, Unpacking and Checking.........................................................................................................46
3.3.1 Transportation.......................................................................................................................................46
3.3.2 Unpacking and Checking......................................................................................................................47
3.4 Mechanical Installation..................................................................................................................................48
3.4.1 UPS Installation....................................................................................................................................48
3.4.2 Optional Accessory Installation ............................................................................................................52
3.5 Electrical Connection.....................................................................................................................................61
3.6 Parallel System Connection ...........................................................................................................................65
3.7 System Check and Test...................................................................................................................................67
3.7.1 Check Electrical Connection.................................................................................................................67
3.7.2 UPS Test................................................................................................................................................67
3.7.3 Connect Load........................................................................................................................................68
4 Touch Screen Operation ............................................................................................................69
4.1 Menu Hierarchy .............................................................................................................................................69
4.2 Main Page ......................................................................................................................................................70
4.3 System Work Status Display ..........................................................................................................................71
4.4 Buzzer Control Function................................................................................................................................76
4.5 Monitor Page..................................................................................................................................................76
4.5.1 Mains Input...........................................................................................................................................76

Contents
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User Manual
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All rights reserved ©Kehua Data Co., Ltd.
4.5.2 Bypass Input .........................................................................................................................................77
4.5.3 Battery Input .........................................................................................................................................78
4.5.4 REC. Module ........................................................................................................................................78
4.5.5 INV. Module .........................................................................................................................................79
4.5.6 Output Information ...............................................................................................................................79
4.6 Set Manage.....................................................................................................................................................80
4.6.1 Cabinet Set............................................................................................................................................81
4.6.2 Battery Set.............................................................................................................................................82
4.6.3 Output Set .............................................................................................................................................82
4.6.4 Smart Mode...........................................................................................................................................83
4.6.5 Dry Contact...........................................................................................................................................83
4.6.6 Battery Test...........................................................................................................................................84
4.6.7 Communication Set...............................................................................................................................84
4.6.8 Record Manage.....................................................................................................................................85
4.6.9 HMI Set.................................................................................................................................................85
4.6.10 Password Set.......................................................................................................................................86
4.7 Information Manage.......................................................................................................................................86
4.7.1 Run Information....................................................................................................................................87
4.7.2 History Record......................................................................................................................................88
4.7.3 User Log ...............................................................................................................................................88
4.7.4 Smart Record ........................................................................................................................................89
4.7.5 Smart Wave Record...............................................................................................................................89
4.7.6 Device Information...............................................................................................................................90
4.8 ON/OFF .........................................................................................................................................................91
5 Use and Operation ......................................................................................................................93
5.1 Use Announcements.......................................................................................................................................93
5.2 Operation Process...........................................................................................................................................93
5.3 ON/OFF Operation.........................................................................................................................................94
5.3.1 Check Before Power-on........................................................................................................................94
5.3.2 Start UPS...............................................................................................................................................94

Uninterruptible Power Supply MR33120
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5.3.3 Shut Down UPS....................................................................................................................................96
5.3.4 Switch to Bypass Mode Manually ........................................................................................................97
5.3.5 Switch to Maintenance Bypass Mode From Mains Mode ....................................................................97
5.3.6 Switch to Inverter Mode from Maintenance Bypass Mode...................................................................98
5.3.7 Emergency Power Off (EPO)................................................................................................................99
5.3.8 Emergency Power Off Recovery...........................................................................................................99
5.4 Parallel System ON/OFF Operation...............................................................................................................99
5.4.1 Start Parallel System.............................................................................................................................99
5.4.2 Shut Down Parallel System.................................................................................................................102
5.4.3 Emergency Power Off(EPO)...............................................................................................................102
6 Maintenance and Troubleshooting .......................................................................................104
6.1 Maintenance Guide ......................................................................................................................................104
6.1.1 Safety Precautions...............................................................................................................................104
6.1.2 Preventive Maintenance......................................................................................................................104
6.2 Battery Maintenance ....................................................................................................................................105
6.3 Battery Replacement Announcements..........................................................................................................105
6.4 Troubleshooting............................................................................................................................................106
6.4.1 Common Abnormal Phenomena Diagnosis ........................................................................................106
6.4.2 Emergency Dispose for System Fault.................................................................................................108
7 Package, Transportation and Storage....................................................................................110
7.1 Package ........................................................................................................................................................ 110
7.2 Transportation .............................................................................................................................................. 110
7.3 Storage ......................................................................................................................................................... 110
A Technical Specifications.........................................................................................................111
B Physical Characters ..................................................................................................................115
C Acronyms and Abbreviations................................................................................................116

Uninterruptible Power Supply MR33120
User Manual
1 Safety Description
All rights reserved ©Kehua Data Co., Ltd.
1
1 Safety Description
This chapter introduces the safety announcements. Prior to performing any work on the UPS, please
read the user manual carefully to avoid human injury and device damage by irregular operations.
1.1 Safety Announcements
This section mainly describes the safety announcements when operation and maintenance. For details,
please refer to safety description in relevant chapters.
Before operating, please read the announcements and operation instructions in this section carefully
to avoid accident.
The promptings in the user manual, such as "Danger", "Warning", "Caution", etc. don't include all
safety announcements. They are just only the supplement of safety announcements when operation.
Any device damage caused by violating the general safety operation requirements or safety standards
of design, production, and usage will be out of Kehua's guarantee range.
1.1.1 Safety Instructions
The input and output of the UPS is dangerous high voltage, once operate improperly, it may endanger
human safety. Please read this manual carefully before installing or operating, and pay attention to
the warning labels. Do not dismantle the cover plate of the UPS unless authorized person.

1 Safety Description
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All rights reserved ©Kehua Data Co., Ltd.
Don't touch terminals or conductors that connected with grid to avoid lethal risk！
Device damage or device fault may cause electric shock or firing!
Before operating, please inspect the device and see if there is any damage or exist other danger.
Check if the external devices or circuit connection is safe.
Touching high voltage and mains directly or through damp objects will lead to lethal risk.
During a lightning storm, it is strictly prohibited to perform high voltage and AC operation, as well as
in the tower or the mast. The atmosphere will generate a strong electromagnetic field in a lightning
storm. Therefore, in order to avoid device struck by lightning, lightning protection and grounding
system should be prepared in time.
The UPS output mustn't connect the half-wave rectifier load or inductive load, such as air-conditioner,
hair drier, starter, electric drill, motor, daylight lamp, etc.

Uninterruptible Power Supply MR33120
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Do not reversely connect the grounding wire and neutral wire, live wire and neutral wire, which will
cause short circuit.
It should be well grounded and the voltage between ground wire and neutral wire should be not more
than 5V.
Please do not put fingers or tools into the rotating fans to avoid human injury or device damage.
In case of fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may cause
electric shock.
Keep good ventilation! Ensure that the air inlet and outlet and fan are not blocked.
The UPS is the class C3 device. If UPS is applied for the low-voltage power supply system of all
commercial areas, light industrial areas that supplies power for the residential building, it may need
to take additional actions to avoid the interference.

1 Safety Description
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All rights reserved ©Kehua Data Co., Ltd.
When UPS is powered off, there still exists dangerous voltage. It should affix warning labels away
from UPS location and the warning labels should include: 1. It supplies power for UPS. 2. Please
disconnect UPS before wiring.
1.1.2 Use Announcements for Battery
Please use specified battery. Non-specified battery will damage the UPS.
The charging voltage of different brands and different models batteries are different. Before using,
ensure that the charging voltage of the UPS matches with battery. If any doubt, please consult the
manufacturer for support.
Battery operation must be done according to instructions, especially battery wiring. Irregular
operation will cause battery damage, even human injury.
It is prohibited to short circuit the anode and cathode of the battery. The battery wiring must be
tightened. It is strictly prohibited to touch any two wiring terminals of battery or the bare
terminals of wires simultaneously, or it may cause battery damage or human injury.
Prevent electrolyte leaking from battery. The metal objects and circuit board will be corroded by
the overflowing electrolyte and it will result in device damage and circuit board short circuit.
Keep the battery away from fire source and devices that easy cause spark to avoid danger or
unnecessary loss.

Uninterruptible Power Supply MR33120
User Manual
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1.1.3 ESD Protection
To prevent human electrostatic damaging sensitive components (such as circuit board), make sure
that you wear a anti-static wrist strap before touching sensitive components, and the other end is well
grounded.
1.1.4 Grounding Requirements
The device must be grounded before wiring. The grounding terminal must be connected to earth.
When installing, the UPS must be grounded first. When dismantling, the grounding wire must be
removed at last;
Don't damage the grounding conductor;
The UPS must be connected to protection grounding permanently. Before operation, check the
electrical connection to ensure the UPS is grounded reliably.
1.1.5 Warning Mark Setting
In order to avoid accident for the unwanted person gets close to the UPS or makes improper
operation, observe the following requirements while installing, maintaining or repairing.
Set warning marks where the switches are to avoid switching them on improperly.
Set warning signs or safety warning belt in the operation area, which is to avoid human injury or
device damage.
After maintenance, please pull out the key of the UPS and save it properly.
1.2 Operation and Maintenance Requirements
There exists high temperature and high voltage inside the UPS. Please comply with the relevant
safety regulations and operation procedures during installation, operation and maintenance to avoid
human injury or device damage. The safety precautions mentioned in the user manual are just as a
supplement to the local safety regulations.

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The related operation and wiring for the UPS should be performed by qualified professionals, and
ensure the electrical installation accords with the electrical installation standards.
The installation and maintenance man should be trained, know about each safety announcement, get
the right operation method, and then, the installation, operation and maintenance can be done.
Mounting and dismantling power cables is prohibited when power on. Please switch off the power
switches before mounting or dismantling power cables. Before connecting, make sure the cable
connection, cable labels are in accordance with the actual installation.
Only authorized professionals are allowed to open the UPS! The input and output of the UPS are
dangerous high voltage. Touching high voltage will lead to lethal risk.
Before maintenance, please disconnect the AC power and battery to isolate the power input. It is
better to measure the input terminals of UPS by a voltmeter to ensure the input power is
disconnected and in a safe condition.
Even if all external powers are disconnected, there still exists residual electric charge on the
capacitor inside the UPS, and the output terminals may exist high voltage which may endanger
human life. It is necessary to set the UPS aside for enough time (≥10 min) to release all charge
before opening the UPS chassis.
The battery circuit isn't isolated with AC input. There may exist dangerous voltage between
battery terminals and grounding terminals. Battery group exists dangerous high voltage. Pay
attention to the insulation when installing and using the battery.
Do not wear conductive objects, such as watches, bracelets and rings during operating.
Drilling holes on the cabinet is prohibited! Inappropriate drilling will damage the components inside
the UPS. Metal debris generated by drilling will lead to circuit board short circuit.

Uninterruptible Power Supply MR33120
User Manual
1 Safety Description
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Changing the UPS configuration, structure or assembly will affect the performance of the UPS. If user
needs to do like this, please consult the manufacturer in advance.
1.3 Environment Requirements
Do not put the UPS in the environment where has inflammable, explosive gas or smog. Don't do any
operation in this environment.
It's dangerous to operate UPS in the explosive environment, please strictly observe the environment
requirements in the user manual when using and storing UPS.
The environment requirements of UPS are as follows.
Meet the UPS operation specification (operating temperature: -5℃～40℃, relative humidity:
0%～95%).
Keep good ventilation and far away from water source, heat source and inflammable and
explosive objects.
The altitude should not exceed 2000m. If the altitude exceeds 2000m, it should reduce the rated
power according to IEC 62040-3.
Please avoid using UPS in the following environment for a long time.
−The place where has direct sunshine or near a heat source.
−The place where has metallic conductive dust.
−The place where has direct sunlight, dust, volatile gas, corrosive material or high salt.

2 Overview
Uninterruptible Power Supply MR33120
User Manual
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2 Overview
This chapter mainly introduces the UPS features, working principle, working mode, operation panel,
appearance, optional components, alarm function, etc.
2.1 Product Intro
The MR33120 is the online double-conversion UPS system, that consists of cabinet, power module,
bypass module, system control box and distribution unit. The modular design is convenient for user
to add, decrease or replace the power module online, which will not affect the UPS operation. It's a
high performance sine-wave UPS that specially designed for the network computer room and
precision instrument of financial, communication, insurance, transportation, tax, army, security,
energy source, education, government, enterprise, etc.
2.1.1 Model Meaning
MR 3 3 □□□
Series mark
MR means the modular UPS
Input phase number mark
3 means the input is three-phase.
Output phase number mark
3 means the output is three-phase.
Output rated power mark
120 means the rated power is 120kVA.
Figure2-1 Model meaning
MR33120 has four power modules and a redundancy slot. UPS can select a redundancy module to
improve UPS reliability. The detailed configuration is as shown in Table2-1.

Uninterruptible Power Supply MR33120
User Manual
2 Overview
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Table2-1 Configuration description
Item
MR33120
Switch configuration
Full configuration(4 pieces)
30K power module
4*30K
Redundancy module
slot
1 piece
Power module height
2U
Bypass module height
3U
UPS dimensions(mm)
600*860*2000
Wiring method
Bottom wiring in default. It's compatible with top wiring(select the top
wiring component).
Remark
1. If the power module isn't fully configured, it can recognize the
actual power through the model in the touch screen. e.g. When
configure two power modules, the model in the touch screen shows
MR33120-60.
2. The power module order is 1 to 5 from bottom to top, see the labels
in the side of cabinet.
2.2 Features
Hot swappable
The power module adopts the none-principle-subordinate parallel control technique, each power
module is independent and do not need to match each other strictly. They can be put into use or exit
online at will, which achieves the online hot maintenance. The system has high adaptability,
availability, expandability and low cost.
Three-level inverter technology
Adopts three-level inverter technology, which makes the quality of output voltage wave better and
the efficiency of whole UPS higher.

2 Overview
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Completely digitalized DSP control
Adopt the completely digitalized DSP control for the inverter control, phase synchronization, output
current-sharing, logic control of the power module, which is with high precision, high speed and
perfect whole system performance.
Energy conservation and high efficiency
Adopt the advanced PFC control technology, the input power factor is greater than 0.99, which
greatly improves the use ratio of electric energy and reduces the load of grid, and saves the cost of
power distribution. The size of whole UPS is small, and the weight is light, calorific value is small,
which enhances the use ratio of environment and decreases the investment cost.
Smart fan speed control
The fan speed is adjusted automatically in accordance with the load status to prolong fan life and
reduce noise.
ECO energy conservation mode design
The UPS is designed with the ECO energy conservation mode. When the grid is good, if the UPS
operates in this mode, the bypass prior to output, and the efficiency can be up to 99%. When the
bypass voltage or frequency is out of normal range and cannot satisfy the user’s power supply
requirement, it will switch to inverter output, and this guarantees the reliability of power supply and
also, save energy.
Manual maintenance bypass design
It designs the manual maintenance bypass channel to ensure the UPS supplies power for load while
maintenance, which greatly improve the system operation reliability and maintainability.
Reliable EMC performance
Pass the authority institution and professional test on EMC, including conducting disturbance,
radioactive disturbance, conducting anti-disturbance, radioactive anti-disturbance, power falling,
mass impulse, static discharging, surge, etc. The excellent EMC characteristics can completely filter
each grid interference, and also, decrease and eliminate the interference of UPS itself effectively.