KEHUA TECH MY-A Series User manual

User Manual
MY-A Series (10kVA-20kVA) UPS

MY-A Series (10kVA-20kVA) UPS
User Manual
Foreword
i
Foreword
Summaries
Thank you for choosing the Uninterruptible Power System (hereinafter referred to as the "UPS")
product!
This document gives a description of the MY-A series UPS, including the features, performance,
appearance, structure, working principles, installation, operation and maintenance.etc.
Please save the manual after reading, in order to consult it in the future.
The figures in this manual are just for reference, for details please see the actual product.
Suitable Model
MY10-A/MY10-AS/MY10-AT
MY15-A/MY15-AS/MY15-AT
MY20-A/MY20-AS/MY20-AT
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 exist, if not avoided, result
in serious injury or death.
Alerts you to a medium or low risk hazard that could exist, if not
avoided, result in moderate or minor injury.
Alerts you to a potentially hazardous situation that could exist, if not
avoided, result in equipment damage, data loss, performance
deterioration, or unanticipated results.

Foreword
MY-A Series (10kVA-20kVA) UPS
User Manual
ii
Symbol
Description
Anti-static prompting.
Be care electric shock prompting.
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 001
Change History
Changes between document issues are cumulative. The latest document issue contains all the changes
made in earlier issues.
Issue 002 (2021-01-15)
Update wiring diagram between UPS and external battery.
Issue 001 (2020-11-19)
First issue.

MY-A Series (10kVA-20kVA) UPS
User Manual
Contents
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Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
1.1.1 Safety Instructions ..................................................................................................................................1
1.1.2 Use Announcements for Battery .............................................................................................................2
1.1.3 Anti-Static Protection..............................................................................................................................3
1.2 Operation and Maintenance Requirements ......................................................................................................3
1.3 Environment Requirements..............................................................................................................................3
2 Overview.........................................................................................................................................5
2.1 Product Intro.....................................................................................................................................................5
2.1.1 Model Meaning.......................................................................................................................................5
2.1.2 Features...................................................................................................................................................6
2.1.3 Appearance..............................................................................................................................................7
2.1.4 Communication.....................................................................................................................................11
2.1.5 Fittings Illustration................................................................................................................................18
2.2 Work Principle................................................................................................................................................18
2.2.1 Work Principle Diagram........................................................................................................................18
2.2.2 Work Mode ...........................................................................................................................................19
3 Installation....................................................................................................................................23
3.1 Announcements..............................................................................................................................................23
3.2 Installation Preparation ..................................................................................................................................23
3.2.1 Tools......................................................................................................................................................23
3.2.2 Install Environment...............................................................................................................................24
3.2.3 Install Space..........................................................................................................................................24
3.2.4 Select Breaker & Wires.........................................................................................................................24

Contents
MY-A Series (10kVA-20kVA) UPS
User Manual
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3.2.5 Select Input Breaker..............................................................................................................................25
3.2.6 Select Wires ..........................................................................................................................................26
3.3 Transport and Unpacking ...............................................................................................................................27
3.3.1 Transport...............................................................................................................................................27
3.3.2 Unpacking.............................................................................................................................................28
3.4 Mechanical Installation ..................................................................................................................................29
3.5 Electrical Connection.....................................................................................................................................32
3.5.1 UPS Wiring Operation ..........................................................................................................................32
3.5.2 Wiring Between UPS and External Battery ..........................................................................................37
3.5.3 Wiring of Parallel System .....................................................................................................................41
4 Touch Screen Operation ............................................................................................................44
4.1 Menu Hierarchy .............................................................................................................................................44
4.2 Main Page ......................................................................................................................................................46
4.2.1 Icon Meaning ........................................................................................................................................46
4.2.2 Working Status......................................................................................................................................47
4.2.3 Bypass Information Page ......................................................................................................................49
4.2.4 Mains Informaiton Page........................................................................................................................50
4.2.5 Battery Information Page......................................................................................................................50
4.2.6 Output Information Page.......................................................................................................................51
4.3 Login Page .....................................................................................................................................................52
4.4 Information Management Page ......................................................................................................................52
4.4.1 Run Information Page ...........................................................................................................................53
4.4.2 History Record Page .............................................................................................................................55
4.4.3 User Log Page.......................................................................................................................................55
4.4.4 Device Infomation Page........................................................................................................................56
4.5 Setting Management Page..............................................................................................................................57
4.5.1 System Manage Page ............................................................................................................................57
4.5.2 Battery Management Page ....................................................................................................................60
4.5.3 Battery Test Page ..................................................................................................................................63
4.5.4 Dry Contact Page ..................................................................................................................................64

MY-A Series (10kVA-20kVA) UPS
User Manual
Contents
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4.5.5 HMI Setting Page..................................................................................................................................66
4.5.6 Password Setting Page ..........................................................................................................................67
4.5.7 Device Configuration Page...................................................................................................................67
4.5.8 Dedust Setting Page..............................................................................................................................70
4.5.9 Record Manage Page ............................................................................................................................71
4.6 Current Fault Page..........................................................................................................................................72
4.7 Buzzer Control ...............................................................................................................................................73
4.8 ON\OFF Operation.........................................................................................................................................74
5 LCD Screen Operation ...............................................................................................................76
5.1 Menu Hierarchy .............................................................................................................................................76
5.2 Main Page ......................................................................................................................................................77
5.3 System Working Status Display .....................................................................................................................77
5.4 Monitoring Page.............................................................................................................................................79
5.5 Setting Management.......................................................................................................................................79
5.5.1 Parameter Setting..................................................................................................................................80
5.5.2 Function Setting....................................................................................................................................81
5.5.3 Log Management ..................................................................................................................................83
5.5.4 Screen Setting .......................................................................................................................................83
5.5.5 Permission Setting ................................................................................................................................84
6 Use and Operation ......................................................................................................................86
6.1 Check Before Startup .....................................................................................................................................86
6.2 Startup Operation ...........................................................................................................................................86
6.3 Shutdown Operation.......................................................................................................................................87
6.4 Parallel System Operation..............................................................................................................................87
6.4.1 Start Parallel System.............................................................................................................................87
6.4.2 Shut Down Parallel System...................................................................................................................88
6.4.3 Exit Parallel System..............................................................................................................................88
6.4.4 Redundance Function of Parallel System..............................................................................................89
6.5 Periodic Preventative Maintenance................................................................................................................89
6.6 Battery Maintenance ......................................................................................................................................89

Contents
MY-A Series (10kVA-20kVA) UPS
User Manual
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6.7 Troubleshooting..............................................................................................................................................90
6.7.1 Common Fault ......................................................................................................................................90
7 Package, Transportation and Storage......................................................................................95
7.1 Package ..........................................................................................................................................................95
7.2 Transportation ................................................................................................................................................95
7.3 Storage ...........................................................................................................................................................95
A Technical Specifications ...........................................................................................................96
B Acronyms and Abbreviations ..................................................................................................99

MY-A Series (10kVA-20kVA) UPS
User Manual
1 Safety Description
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 introduces the safety announcements that must be complied with and pay special
attention while installing, using, maintenance and other relative operations.
Before operating, please read the announcements and operation instructions in this section carefully
to avoid accident.
The DANGER, WARNING, CAUTION, etc. in the manual are not all the safety announcements that
you must abide by, they are just the supplements for the safety announcements during operating.
Our company does not undertake the responsibility caused by violating common safety operation
requirements or the safety standard of design, manufacture and use.
1.1.1 Safety Instructions
There exists high temperature and high voltage inside the UPS. During using, please strictly comply
with all warnings and operation instruments on the UPS and in the user manual.

1 Safety Description
MY-A Series (10kVA-20kVA) UPS
User Manual
2
The UPS is class C3 device. If it is used in residential purpose, it may cause wireless interference.
User should take actions to avoid the interference.
No liquid or other objects are allowed to enter the UPS.
UPS must be well grounded.
In case of fire, please use dry power fire extinguisher. If using liquid fire extinguisher, it may
cause electric shock.
1.1.2 Use Announcements for Battery
The following instructions are for models with built-in batteries only.
Please use specified battery. Non-specified battery will damage the UPS.
Only authorized professional can replace battery. Do not wear conductive objects, such as
watches, bracelets and rings during operating. Wear rubber shoes and gloves and use tools with
insulated handle.
Don't put tools or other conductive objects on the battery.
It is prohibited to short the positive pole and negative pole of the battery or connect them
reversely, which is to avoid fire or electric shock.
Before connecting or disconnecting the battery terminals, disconnect charger first.
The battery must be with the same type, model and manufacturer.
Battery should be kept away from fire source or other electrical equipment that may easily cause
spark to avoid human injury.
Don't open or destroy the battery. The electrolyte in the battery includes some dangerous objects,
such as strong acid, which will be harmful to skin and eyes. If it is careless to touch the
electrolyte, clean it by a lot of water immediately and then check it in the hospital.
The waste battery should be disposed according to the local regulations.