KEHUA TECH SPI500K-B User manual

User Manual
SPI500K-B (V4.1-V4.3)

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Copyright © Xiamen Kehua Hengsheng Co., Ltd. 2016. 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 Xiamen Kehua Hengsheng Co., Ltd.
Trademarks and Permissions
and other Kehua trademarks are trademarks of Xiamen Kehua Hengsheng 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.
XIAMENKEHUA HENGSHENG CO., LTD.
Address:
No.457, Malong Road, Torch High-Tech Industrial Zone, Xiamen,
Fujian, China
Postal Code:
361000(XIAMEN)
Website:
www.kehua.com
E-mail:
[email protected]
The Customer Service Telephone:
400-808-9986
Tel:
0592-5160516
Fax:
0592-5162166

Foreword
SPI500K-B (V4.1-V4.3)
User Manual
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All rights reserved ©Xiamen Kehua Hengsheng Co., Ltd.
Foreword
Summaries
Thank you for choosing the Kehua SPI Series products! This manual is suitable for SPI500K
(V4.1-V4.3) series indoor grid-connected inverter.
This document gives a description of the product, including the inverter features, performance,
appearance, structure, working principles, installation, operation and maintenance .etc.
Please save the information after reading, in order to consult in the future.
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.
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-XMHS003-2015

SPI500K-B (V4.1-V4.3)
User Manual
Foreword
All rights reserved ©Xiamen Kehua Hengsheng Co., Ltd.
iii
Change History
Changes between document issues are cumulative. The latest document issue contains all the changes
made in earlier issues.
Issue 001 (2016-10-14)
First issue.

Contents
SPI500K-B (V4.1-V4.3)
User Manual
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All rights reserved ©Xiamen Kehua Hengsheng Co., Ltd.
Contents
1 Safety Description.........................................................................................................................1
1.1 Safety Announcements.....................................................................................................................................1
2 Overview.........................................................................................................................................3
2.1 Product Intro.....................................................................................................................................................3
2.1.1 Features...................................................................................................................................................3
2.1.2 Nameplate ...............................................................................................................................................4
2.1.3 Product Difference ..................................................................................................................................5
2.2 Appearance and Panel ......................................................................................................................................5
2.2.1 Appearance..............................................................................................................................................5
2.2.2 Panel........................................................................................................................................................5
2.3 Component Description....................................................................................................................................7
2.3.1 DC Disconnector.....................................................................................................................................7
2.3.2 AC Disconnector.....................................................................................................................................7
2.3.3 Fuse of DC Sideand AC Side..................................................................................................................7
2.4 Work Principle..................................................................................................................................................8
2.5 Working Modes ..............................................................................................................................................10
2.6 Monitoring Mode ........................................................................................................................................... 11
2.6.1 Monitor by RS485 Information Collector............................................................................................. 11
2.6.2 Computer Monitor by RS485................................................................................................................12
3 Installation....................................................................................................................................13
3.1 Unpacking and Checking ...............................................................................................................................13
3.2 Installation Preparation ..................................................................................................................................13
3.2.1 Tools......................................................................................................................................................13
3.2.2 Installation Environment.......................................................................................................................15

SPI500K-B (V4.1-V4.3)
User Manual
Contents
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3.2.3 Installation Clearance............................................................................................................................16
3.2.4 Heat Dissipation Requirements for Installing Environment .................................................................17
3.3 Transportation ................................................................................................................................................18
3.3.1 Forklift Transportation ..........................................................................................................................18
3.3.2 Lifting Transportation ...........................................................................................................................19
3.4 Installation Procedure.....................................................................................................................................20
3.5 Electrical Connection .....................................................................................................................................23
3.5.1 Wiring Requiremnts ..............................................................................................................................23
3.5.2 Wiring Procedure ..................................................................................................................................24
4 Operation Guide .........................................................................................................................28
4.1 Function of Touch Screen...............................................................................................................................28
4.2 Menu Structure of LCD Touch Screen ...........................................................................................................29
4.3 Main Page ......................................................................................................................................................30
4.4 Login ..............................................................................................................................................................31
4.5 ON/OFF Operation.........................................................................................................................................33
4.5.1 ON Operation........................................................................................................................................33
4.5.2 OFF Operation ......................................................................................................................................34
4.6 Running Parameters Display ..........................................................................................................................34
4.6.1 Look Up Operation Procedure ..............................................................................................................34
4.7 Preferences .....................................................................................................................................................35
4.8 Engineering Setting........................................................................................................................................37
4.9 NowFault Inquiry ...........................................................................................................................................39
4.10 History Information......................................................................................................................................40
4.11 Recover to Factory Setting ...........................................................................................................................40
5 System Commissioning .............................................................................................................42
5.1 Manual Operation...........................................................................................................................................42
5.1.1 Check Before Operating........................................................................................................................42
5.1.2 Startup Procedure..................................................................................................................................42
5.2 Self-starting....................................................................................................................................................44

Contents
SPI500K-B (V4.1-V4.3)
User Manual
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All rights reserved ©Xiamen Kehua Hengsheng Co., Ltd.
6 Routine Maintenance .................................................................................................................45
6.1 Machine Room Management .........................................................................................................................45
6.2 Maintenance Guide ........................................................................................................................................46
6.3 Safety Precautions..........................................................................................................................................46
6.4 Preventive Maintenance .................................................................................................................................46
6.5 Maintenance Operation Procedure .................................................................................................................47
7 Troubleshooting..........................................................................................................................48
7.1 Rectifying Common Faults ............................................................................................................................48
A Technical Specifications...........................................................................................................51
B Acronyms and Abbreviations ..................................................................................................54

SPI500K-B (V4.1-V4.3)
User Manual
1 Safety Description
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1
1 Safety Description
This chapter describes the safety symbols and safety announcements. Please read this user manual
carefully prior to installing the device, and operate and install according to the instructions described
in the manual to avoid human dangerous or device damage. Any equipment damage caused by
violating the common safety operation requirements or safety standards of design, producing, and
using will be out of Xiamen Kehua's warranty range.
1.1 Safety Announcements
⚫There is no operational part inside the inverter. Please do not open the crust of the inverter by
yourself, or it may cause electric shock. The inverter damage caused by illegal operation is out of
the guarantee range.
⚫All operation and wiring should be performed by professionals with corresponding qualification,
which is to ensure that all the electric installation accord with the standard of electric installation.
⚫Before checking or maintenance, if the DC side and AC side is power down just now, it is
necessary to wait for 20 minutes to ensure the inner inverter is completely discharged, and then
the operation can be performed.
⚫When install the PV array in daytime, it necessary to cover the solar battery array by light-proof
material, or the solar battery array will generate high voltage under the sunshine.
⚫The operation environment may influence the life span and reliability of the inverter. So, please
avoid to use the inverter in following environment:
⚫The place where temperature and humidity beyond the technical specifications (temperature:
-25℃～55℃);
−The place with direct sunshine or rain;
−The place with vibration or impact;
−The place with dust, corrosive materials, salt or burnable gas;
−The place with bad ventilation or closed situation;

1 Safety Description
SPI500K-B (V4.1-V4.3)
User Manual
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−The place where close to resident living quarter.
⚫No liquid or other objects are allowed to enter the cabinet.
⚫High leakage risk! The inverter must be grounded before electrical connection. The ground
terminal must be connected to the ground.
⚫The product is grade A device. If the product is used in resident living, it may cause wireless
interference. User should take actions to avoid the interference.
⚫The product may cause DC current in external protective earthing conductor. If adopts residual
current device (RCD) or monitor (RCM) as the protection of direct or indirect contacting, the
type B RCD or RCM can be used only in the input end of the product.
⚫Please do not put finger or tool into rotating fans to avoid endanger the human safety or damage
the inverter.
⚫In case fire, please use dry power fire extinguisher. if using liquid fire extinguisher, it may cause
electric shock.
⚫Before contact the sensitive component, please wear anti-static rings and well connect the other
end of the anti-static rings to ground.

SPI500K-B (V4.1-V4.3)
User Manual
2 Overview
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2 Overview
This chapter mainly introduces the product features, appearance, operation panel, work principle,
work modes, etc.
2.1 Product Intro
The grid-connected inverter is used as the PV grid-connected inverter in PV grid-connected power
generation system. In the system, grid-connected inverter could always make the solar battery plate
output the maximum power, and transform output energy and transmit to gird. The PV
grid-connected power generation system consists of PV modules, PV junction box,andPV
grid-connected inverter, metering device and power distribution system.as shown in Figure2-1.
PV module PV junction
box PV grid-connected
inverter Electricity
meter Power grid
Figure2-1 PV grid-connected power generation system
The PV grid-connected power generation should be allowed by local power supply department and
operate by professionals.
2.1.1 Features
⚫Wide input voltage range.
⚫Output adopts LC filtering way.
⚫Adopt advanced IGBT power module
⚫Adopt the safe and reliable DSP+CPLD control architecture and fiber transmission.
⚫The busbar adopt the film capacitance to ensure the equipment’s working life.

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⚫Sine wave output, automatic synchronism grid, small current harmonic, non-pollution and impact
for grid.
⚫Adopt disturbance detection technology to realize the anti-islanding operation protection.
⚫Perfect protection function and high reliability.
⚫Excellent thermal design, lower temperature-rise and longer service life.
⚫Adopting advanced MPPT algorithms - MPPT efficiency 99.9%.
⚫LCD touch screen and multi-language interface setting
⚫Can be monitored by RS232/RS485 communication port
⚫Protection and operation parameters setting
⚫Modular design, easy to install ,operate and maintain
⚫Auxiliary heating function(optional)
⚫Low voltage ride through and reactive power compensation function(optional).
⚫Coordinate with Kehua’s anti-countercurrent system and use in grid-connected self-used project.
2.1.2 Nameplate
The important information of the product can be obtained on the nameplate, as shown in Figure2-2.
Figure2-2 SPI500K-B (V4.1~V4.3)nameplate information

SPI500K-B (V4.1-V4.3)
User Manual
2 Overview
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2.1.3 Product Difference
The product difference of SPI500K-B(V4.1-4.3) is as shown in Table2-1.
Table2-1 The product difference ofSPI500K-B(V4.1-4.3)
Model
Difference
SPI500K-B V4.1
DC input is 1 route disconnector.
SPI500K-B V4.2
DC input is 8 routes breaker.
SPI500K-B V4.3
DC input is 8 routes breaker with anti-reverse diode.
2.2 Appearance and Panel
2.2.1 Appearance
The appearance of SPI500K-B products is as shown in Figure2-3.
Figure2-3 Appearance
2.2.2 Panel
The operation panel of SPI500K-B series products is as shown in Figure2-4.

2 Overview
SPI500K-B (V4.1-V4.3)
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① ② ③
④
⑤
Figure2-4 Operation panel
The description of operation panel is as shown in Table2-2.
Table2-2 Description of the operation panel
NO.
Silk screen
Name
Description
○,1
RUN
RUN indicator
Green: when the indicator is on, the PV
grid-connected inverter is going to generate power.
○,2
POWER
POWER indicator
Green: when the indicator is on, the power supply
of control power is normal.
○,3
ALARM
ALARM indicator
Red: when the indicator is on, the equipment is
faulty, when the fault disappears, it will turn off
automatic.
○,4
Display screen
Display and setting.
○,5
EPO
EPO button is used to disconnect the connection of
the inverter and power grid in emergency, which
ensure the safety of the inverter. Be sure to spin off
the EPO button before the system restart.
After using EPO button, if you want to recover grid-connected, user need to popup the EPO and
reboot the control power.

SPI500K-B (V4.1-V4.3)
User Manual
2 Overview
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2.3 Component Description
2.3.1 DC Disconnector
DC disconnector is the connector between PV grid-connected inverter and PV modules. When the
equipment is working properly, the DC disconnector must stay in “ON” position. When operating and
wiring, keep the DC disconnector stay in “OFF” position. When maintenance, place the DC
disconnector stay in “OFF” position and wait for 20 minutes, and measure that the DC busbar voltage
inside the device should be under 10 V, then the maintenance can be done.
Before maintenance or wiring, it is necessary to disconnect the DC disconnector.
2.3.2 AC Disconnector
AC disconnector is the connector between PV grid-connected inverter and power grid. Keep the
disconnector stay in “ON” position when the equipment is working properly.
Be sure to switch off the AC disconnector under below situations.
⚫Before wiring, disconnect the AC disconnector.
⚫Before maintenance, switch off AC disconnector and wait for 20 minutes to avoid electric shock.
⚫If it needs to recover grid-connection after pressing EPO, switch off the AC disconnector and the
DC disconnector and then switch them on again after disconnecting the power of the inverter.
2.3.3 Fuse of DC Sideand AC Side
The fuse of DC side is the protection for solar battery plate and PV grid-connected inverter (the
product of V4.1 version has the fuse only, other versions is 8 routes breaker). The fuse of AC side is
the protection of PV grid-connected inverter and power grid. When some serious faults occur, the
fuse will fuse to ensure the separation of solar battery plate and PV grid-connected inverter, power
grid and PV grid-connected inverter.
If the fuse is damaged and needs to replace, it must accord with the requirements shown in Table2-3.

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Table2-3 Requirement of fuse
Position
Fuse of AC side
Rated voltage
690V
Rated current
1600A
Recommended model and brand
170M6469 / Bussmann
2.4 Work Principle
The electricity produced by PV modules goes through SPD and DC filter. The SPD absorb DC side
surge voltage, and DC filter restrain high-frequency signal conduction interference, and keep the DC
voltage stable with storage capacitor, Three phase full bridge inverter unit will convert DC to AC of
the same frequency and phase with power grid, and produce sine wave AC through filtering, and then
AC filter suppressing conducted interference from high frequency signal, the electricity will be
delivered to the grid by befitting transformer.
The product difference ofSPI500K-B(V4.1-4.3) is as shown in Table2-1The working principle of the
V4.3inverter is as shown in Figure2-5.

SPI500K-B (V4.1-V4.3)
User Manual
2 Overview
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( –)
( +
)
PV8
DC
breaker
( –)
( +
)
PV7
( –)
( +
)
( –)
( +
)
( –)
( +
)
PV2
( –)
( +
)
PV1
IGBT power module
Three-phase inverting bridge topology
B
C
AUX
W
V
U
SPD
GND
( –)
BUS
( + )
BUS
Main contactor Output breaker
Output EMI filter
U
V
W
A
DC voltage sampling
Inverting
current
sampling
Inverting voltage
sampling Output voltage
sampling
Output current
sampling
AUX
CR
HCT
HCT
HCT FUSE CT
CT
CT
FUSE FUSE
SPD
+–
GND GND
Input EMI
filter
L1
C2
Figure2-5 Work principle diagram of V4.3 product

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2.5 Working Modes
The inverter can realize nobody monitoring and automatic working. System will determine whether
to connect grid and generate power according to the output power of PV array. The system running
process includes start, connect grid and generation, standby, normal halt and fault dispose.
Modes conversion procedure of the inverter is as shown in Figure2-6.
Figure2-6 Modes conversion procedure
Upv is PV array DC output voltage, and Ipv is PV array DC output current.
Startup
The startup mode is the preparation stage from machine halt mode to grid-connected generation mode.
In this mode, the grid-connected inverter continually detects whether the PV module has enough
energy to grid-connected generation, if the open-circuit voltage of PV module is up to 480V, it will
switch to grid-connected generation mode from startup mode.
Grid-connected generation
Grid-connected generation means that the inverter converts the DC power of PV array into AC power
and deliver to grid. In order to output the maximum power as far as possible, system adopts the
maximum power point tracking (MPPT) control mode, it is said that no matter in any sunlight and
temperature, the solar battery arrays output the maximum power.

SPI500K-B (V4.1-V4.3)
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Standby
Standby means that the output voltage of PV array up to a certain value and the parameters of grid
voltage and frequency are within normal range, and the grid-connected contactor is connected, but
the output energy of PV array is not enough to generate power continuously. In this mode, the
inverter generates power per 5 minutes, when PV array detects that there have enough energy to meet
the condition of continuous grid-connected power generation; the inverter will maintain
grid-connected.
Halt protection
When light intensity decreases, the array output power decreases too. When the array power is low,
the device will enter standby mode firstly. When the open circuit voltage of PV array is less than the
shutdown voltage for 5 minutes, grid side contactor will disconnect from the grid. If the shutdown is
because of clicking stop button in manual mode, need to click” RUN” button to reconnect.
Fault
When system detects a fault, if system is in grid-connected mode, it should stop and disconnect
immediately, in this status, the alarm indicator is steady on, the buzzer is buzzing, LCD display fault,
and user can dispose according to current fault and troubleshooting table. After 5 minutes, the system
will automatically detect whether it meets the condition of grid-connected. If the conditions are met,
it starts to generate power normally, otherwise the fault status will maintain until the system recovers.
2.6 Monitoring Mode
The inverter has various monitoring modes, user can easily obtain the current operation data of the
inverter. There are two monitoring modes as follows.
2.6.1 Monitor by RS485 Information Collector
PV grid-connected
inverter 2 PV grid-connected
inverter 3
PV grid-
connected inverter
N
PV grid-connected
inverter 1
Information
collector
Figure2-7 Monitoring by RS485 information collector

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2.6.2 Computer Monitor by RS485
PV grid-connected
inverter 2 PV grid-connected
inverter 3 PV grid-connected
inverter N
PV grid-connected
inverter 1
Information collector PC
Figure2-8 Computer monitor by RS485
When monitoring PV grid-connected inverter by PC, the communication adopts RS485 bus, and
there is a RS485/RS232 electrical level converter between PC and RS485, the communication system
wiring is as shown in Figure2-9.
PV grid-connected
inverter Computer
A
B
TX
RX
Figure2-9 connection between the inverter and PC
The RS485 port position of the inverter is as shown in Figure2-10.
Figure2-10 Position of RS485 port