LIVOLTEK GT3-20K-D, GT3-28K-D, GT3-30K-D User Manual

Ver. 00
GT3 17K-30K
Contents
Forward
01
Application Model
01
Intended Audience
01
Symbol Conventions
02
1 Safety Precautions
03
1.1 Personnel Safety
03
1.2 The PV Inverter Protection
03
1.3 Installation Safety
03
1.4 Electrical Connections
04
1.5 Operating and Commissioning
04
1.6 Maintenance
04
1.7 Additional Information
05
2 Overview of the Inverter
06
2.1 Functional Models
06
2.1.1 Function
06
2.1.2 Model Description
06
2.2 Network Application
2.2.1 Grid-tied PV Power Systems
2.3 Outline and Dimensions
06
06
07
2.3.1 Dimensions
07
2.3.2 Outline
08
2.4 Working Modes
09
3 Storage
10
4 Installation
11
4.1 Checking the Outer Packing
11
4.2 Moving the Inverter
12
4.3 Identify the PV Inverter
12
4.3.1 Nameplate
12
4.3.2 Compliance and Safety Symbols
13
4.4 Installation Requirements
4.4.1 Determining the Installation Position
13
13
4.4.2 Installation Mode Requirements
17
4.5 Support-mounting the Inverter
17
4.6 Installation Self-check
18
5 Electrical Connections
5.1 Connecting Protection Ground (PGND) Cables
19
19
5.1.1 Preparation
19
5.1.2 Wiring Procedures
20
5.2 Connecting AC Output Cables
21
5.2.1 Preparation
21
5.2.2 Procedure of Connecting AC Cables
22
5.3 Connecting the PV Strings
5.3.1 Preparation
5.3.2 Procedure of connecting the PV Strings
5.4 Connecting Communication Cables
5.4.1 Communication Mode Description
5.5 Installation Verification
6 System Operation
24
25
26
28
28
29
30
6.1 Powering ON the Inverter
30
6.2 Powering OFF the Inverter
30
7 User Interface
31
8 Maintenance
34
8.1 Routine Maintenance
34
8.2 The Inverter Troubleshooting
35
8.3 Removing the Inverter
37
9 Disposal of the Inverter
39
10 Technical Specifications
40
Forward
Dear User,
Thank you so much for your choosing GT3 17K-30K, the latest generation of grid-tied PV
Strings inverter (hereinafter referred to as the inverter) designed and developed by our
company.
This user manual introduces the inverter in terms of its installation, electrical connections,
operation, commissioning, maintenance, and troubleshooting. Please read through the manual
carefully before installing and using the inverter, and keep the manual well for future reference.
Application Model
Grid-tied PV string inverter
GT3-17K/20K/22K-D
GT3-25K/28K/30K-D
Intended Audience
This user manual is intended for photovoltaic (PV) inverter operating personnel and qualified
electrical technicians.
Notes:
This user manual is subject to change (specific please in kind prevail) without prior notice.
1
Symbol Conventions
Safety symbols used in this manual, which highlight potential safety risks and important safety
information, are listed as follows:
Symbol
Description
DANGER
Indicates an imminently hazardous situation which, if not correctly
followed, will result in serious injury or death.
WARNING
Indicates a potentially hazardous situation which, if not correctly
followed, could result in serious injury or death.
CAUTION
Indicates a potentially hazardous situation which, if not correctly
followed, could result in moderate or minor injury.
NOTICE
Indicates a potentially hazardous situation which, if not correctly
followed, could result in equipment failure to run, or property damage.
NOTE
Calls attention to important information, best practices and tips:
supplement additional safety instructions for your better use of the
PV inverter to reduce the waste of your resource.
Refer
Refer to documentation (Remind operators to refer to the
documentation shipped with the inverter).
2
1 Safety Precautions
Before beginning your journey, please read these safety precautions in User Manual carefully.
1.1 Personnel Safety
a. The PV inverter must be installed, electronically connected, operated and maintained through
specially trained technician;
b. The qualified technician must be familiar with the safety regulations of electrical system,
working process of PV power generation system, and standards of local power grid;
c. The technician must read through this User Manual carefully and master it before any operation.
1.2 The PV Inverter Protection
NOTICE
As soon as receiving the PV inverter, please check if it is damaged
during its transportation. If yes, please contact your dealer immediately.
a. Do not tamper with any warning signs on the inverter enclosure because these signs contain
important information about safe operation.
b. Do not remove or damage the nameplate on the inverter’s enclosure because it contains
important product information.
c. Do not remove the anti-dismantle label on the inverter’s enclosure because it is the basis for
product warranty.
1.3 Installation Safety
NOTICE
Please read the User Manual carefully before installing the PV inverter;
warranty or liability will be void from our company if damage is caused
by installation faults.
a. Ensure there is no electronical connections around ports of the PV inverter before installing;
b. Adequate ventilation must be provided for inverter installation location. Mount the inverter in
vertical direction, and ensure that no object is put on the heat sink affecting the cooling. (For
details, refer to Chapter 4 Installation)
3
1.4 Electrical Connections
DANGER
Before installing the inverter, check all electrical ports to ensure no
damage and no short circuit. Otherwise personal casualty and/or fire
will occur.
a. Input terminals of the PV inverter apply only to input terminals of PV String; do not connect
any other DC source to the input terminals.
b. Before connecting PV modules, ensure that is its voltage is within the safe range; when
exposed to any sunlight, PV modules can generate high voltage.
c. All electrical connections must meet the electrical standards of the country or region.
d. Cables used in electrical connections must be well fixed, good insulation, and with
appropriate specification.
1.5 Operating and Commissioning
DANGER
While the inverter operating, high voltage can lead to an electrical
shock hazard, and even cause personal casualties. Therefore,
operate the PV inverter strictly according to the safety precautions in
the user manual.
A. Before getting the permission of electrical power sector in the country/region, the grid-tied
PV inverter cannot start generate power.
b. Follow the procedures of commissioning described in the user manual when commissioning
the PV inverter.
c. Do not touch any other parts'surface except the DC switch when the PV inverter is operating;
its partial parts will be extremely hot and can cause burns.
1.6 Maintenance
DANGER
Power OFF all electrical terminals before the inverter maintenance;
strictly comply with the safety precautions in this document when
operating the inverter.
4
a. For personal safety, maintenance personnel must wear appropriate personal protective
equipment (like insulation gloves and protective shoes) for the inverter maintenance.
b. Place temporary warning signs or erect fences to prevent unauthorized access to the
maintenance site.
c. Follow the procedures of maintenance stipulated in the manual strictly.
d. Check the relevant safety and performance of the inverter; rectify any faults that may
compromise the inverter security performance before restarting the inverter.
1.7 Additional Information
NOTICE
To avoid any other unforeseeable risk, contact your dealer immediately
if there is any issue found during operation.
5
2 Overview of the Inverter
This chapter introduces the inverter and describes its functional model, network application,
appearance, dimensions, and working process etc.
2.1 Functional Models
2.1.1 Function
This series is a three-phase grid-tied PV string inverter (transformer less) that converts the DC
power generated by PV strings into AC power and feeds the power into power grid.
WARNING
The inverter is transformerless. Add an isolation transformer before
grounding the positive/ negative terminal of PV modules (like Thin
Film module) for operation.
WARNING
Do not connect PV modules in parallel to several PV inverters for
operation.
2.1.2 Model Description
Figure 2.1 shows a model number of the inverter, using 17K as an example.
GT3-3K-D
D:double MPPT
Power class code
3：three phase
Figure 2.1 Model number descriptions
2.2 Network Application
2.2.1 Grid-tied PV Power Systems
The series apply to grid-tied PV power systems for industrial/commercial rooftops, fishing/farmers
light complementary power generation systems, and large ground-based power stations, as
shown in Figures 2.2.
6
PV strings
inverter
AC Distribution Unit
low-voltage power grid
Figure 2.2 a low-voltage grid-tied PV power system
These series support the power grid modes TN-S, TN-C, TN-C-S, and TT, as shown in Figure 2.3.
Inverter
Inverter
TN-S
Inverter
TN-C
Inverter
TN-C-S
TT
Figure 2.3 Power grids supported by these series inverters
2.3 Outline and Dimensions
2.3.1 Dimensions
Figures 2.4 shows the dimensions of PV inverter as follows:
270.5
469.5
555
Figures 2.4 The dimensions of the PV inverter (unit: mm)
7
2.3.2 Outline
Figures 2.5 to 2.7 show the outline of the inverters as follows:
1. PV Indicator
2. Grid Indicator
3. COM Indicator
4. Warning Indicator
Figure 2.5 The front view and amplification effect of LED indicator area
Install the backboard
Figure 2.6 The rear view of PV inverter
1. PV Strings connectors
2. DC Switch
3. Communications interface
4. RS485
5. AC output connectors
6. Fan(25K/28K/30K)
7. Vent valve
8. External Protection Ground interface
8
Figure 2.7 The bottom view of PV inverter
8
2.4 Working Modes
Three working modes of the inverter are shown as follows: standby, operating, and shutdown.
Table 2.1 shows the conditions for the inverter to switch between working modes.
Modes
Description
Standby
The PV inverter enters the standby mode when
>the input voltage of PV Strings can enable auxiliary power supply to run,
but cannot meet the inverter operation requirements.
>the input voltage of PV Strings can meet the inverter to-start requirements,
but cannot meet its minimum power requirements.
Operating
When the PV inverter is grid-tied and generates electricity, it
> tracks the maximum power point to maximize the PV String output.
> converts DC power from PV strings into AC power and feeds the power
to the power grid.
The PV inverter will enter to the shutdown mode if detecting a fault or a
shutdown command.
Shutdown
The PV inverter switches from standby or operating mode to shutdown
mode if detecting a fault or a shutdown command.
The inverter switches from shutdown mode to standby mode if receiving
a Startup command or detecting that a fault is rectified.
Table 2.1 Working modes description
9
3 Storage
This chapter describes the storage requirements for the inverter.
The following storage instructions apply if the PV inverter will not be deployed immediately:
> Do not unpack the inverter (put desiccant in the original box if the PV inverter is unpacked).
> Store the PV inverter at a temperature range of -40℃ to +70℃ and with the relative humidity
of 0% to 100% (no condensing).
> The PV inverter should be stored in a clean and dry place and be protected from dust and
water vapor corrosion.
> A maximum of four layers of inverters can be stacked.
> Do not position the inverter at a front tilt, excessive back tilt, or side tilt, or upside down.
> Conduct periodic inspection during storage. Replace the packing materials immediately if any
rodent bites are found.
> Ensure that qualified personnel inspect and test the inverter before use if it has been stored
for a long time.
10
4 Installation
DANGER
Do not install the inverter on flammable building materials or in an
area that stores flammable or explosive materials.
CAUTION
Do not install the inverter in a place where personnel are likely to
come into contact with its enclosure and heat sinks to avoid electrical
shock/burn.
4.1 Checking the Outer Packing
a. When receiving the inverter, check that the packing materials are intact.
b. After unpacking, check that the deliverables are complete, intact, and consistent with your
order list.
c. Examine the PV inverter and its fittings for damage such as scraps and cracks.
The deliverables in the fittings of inverter
G
Items
Deliverables
A
The inverter
B
AC output connector
C
Rear panel
D
File package
E
DC terminal connector group
F
M6 screw
G
Bolt group (including screw, nut)*3
(reserved for tighteningthe support and rear panel)
Figure 4.1 The deliverables: The inverter and its fittings
11
NOTICE
If any damage mentioned above is found, contact the dealer
immediately.
4.2 Moving the Inverter
After checking the outer packing, move the PV inverter to the designated installation position
horizontally, as shown in Figure 4.2.
Figure 4.2 Moving the inverter
CAUTION
The inverter is relatively heavy! To prevent device damage and personal
injury, it need two people to move the inverter and handle with care.
CAUTION
>Do not place the PV inverter with its wiring terminals contacting the
floor because the power ports and signal ports at the bottom of the
device are not designed to support the weight of the inverter.
>When placing the inverter on the floor horizontally, put foam or
paper under to protect its enclosure.
4.3 Identify the PV Inverter
4.3.1 Nameplate
After moving the PV inverter from packing box, identify it by reading its nameplate labeled on the
side of the inverter. The nameplate contains important product information: the model information,
communication/technical specifications, and compliance symbols shown in inverter.
12
4.3.2 Compliance and Safety Symbols
Safety symbol
10min
Description
Electrical shock!
There are residual voltages in the PV inverter. It needs 10 minutes
to finish discharge.
The PV inverter must not be touched when in operation. Its
enclosure and heat sinks are extremely hot.
Electrical shock! This part is charged. Only qualified and / or trained
electrical technicians are allowed to perform operations on the inverter.
If the inverter service life has expired, dispose it in accordance with
local rules for disposal of electrical equipment waste. Do not dispose
the PV inverter with household garbage.
The PV inverter is compliant with TUV.
4.4 Installation Requirements
According to installation position, one kinds of physical installation are described below in detail:
Support-mounting.
4.4.1 Determining the Installation Position
Basic Requirements
a.
b.
The inverter is protected to IP65 and can be installed indoors or outdoors.
The installation method and position must be appropriate for the weight and dimensions of
the inverter.
c.
Do not install the inverter in a place where personnel are likely to come into contact with its
enclosure and heat sinks because these parts are extremely hot during operation.
d.
Do not install the inverter in an area that stores flammable or explosive materials.
Installation Environment Requirements
a.
The ambient temperature must be below 50℃ which ensures the inverter’s optimal
operation and extends its service life.
13
b.
The inverter must be installed in a well ventilated environment to ensure good heat dissipation.
c.
The inverter must be free from direct exposure to sunlight, rain, and snow to extend its service
life. It is recommended that the inverter be installed in a sheltered place. If no shelter is
available, build an awning, as shown in Figure 4.3.
≥1000
Awning
≥500
the front view
the lateral view
Figure 4.3 Installation environment with awning (unit: mm)
Carrier Requirements
a.
The carrier where the inverter is installed must be fire-proof. Do not install the inverter on
flammable building materials.
b.
The wall must be solid enough to bear the weight of the inverter.
c.
Do not install the inverter on a wall made of gypsum boards or similar materials with weak
sound insulation to avoid noise disturbance in a residential area.
Installation Space Requirements
a.
It is recommended that the inverter be installed at eye level to facilitate operation and
maintenance.
b.
Reserve enough clearance around the inverter to ensure sufficient space for installation
and heat dissipation, as shown in Figure 4.4.
14
>500
>1000
>200
>200
>600
>600
Distance from air duct to obstacle
Do not place obstacles in the dotted frame
to avoid blocking the air duct
Figure 4.4 Installation Space Requirements (unit: mm)
c.
When installing multiple inverters, install them along the same line (as shown in Figure 4.5)
if sufficient space is available, and install them in triangle mode (as shown in Figure 4.6) or
in stacked mode (as shown in Figure 4.7) if no sufficient space is available. The installation
modes ensure sufficient space for installation and heat dissipation.
200
200
Figure 4.5 Installation along the same line (unit: mm)
15
300
100
Figure 4.6 Installation in triangle mode (unit: mm)
1000
200
Figure 4.7 Installation in stacked mode (unit: mm)
NOTICE
The clearance between multiple inverters must be increased to
ensure proper heat dissipation when they are installed in a hot area.
16
4.4.2 Installation Mode Requirements
Install the inverter upright or at a maximum back tilt of 15 degrees to facilitate heat dissipation.
Below are some correct / wrong installation modes, as shown in Figure 4.8&4.9.
The correct installation mode
upright
back tilt
Figure 4.8 The correct installation mode
The wrong installation mode
Horizontally
Upside-down
Figure 4.9 The wrong installation modes
NOTICE
The wrong installation will lead to failure of the inverter operation.
4.5 Support-mounting the Inverter
Step 1 Support-mounting the inverter is recommended. Tighten the support and rear panel using
M12 bolt and the required torque is 42N.m, as shown in Figure 4.10.
Φ14
Figure 4.10 Securing a rear panel
17
Step 2 Mount the inverter on the rear panel and keep them aligned with each other, as shown
in Figure 4.11.
Figure 4.11 Mounting the inverter
Step 3 Tighten one screw at the right of the inverter and the retaining screw on the rear panel,
and ensure that they are secured, as shown in Figure 4.12.
The required torque is 3 N·m
Figure 4.12 Securing the inverter
4.6 Installation Self-check
Ensure that the supporting points (on the rear side of the inverter) align with the holes of
the support;
Ensure that the inverter is well fixed;
Ensure that the inverter is locked on the support .
18
5 Electrical Connections
Before performing any electrical connections, ensure that both DC
and AC Switches are OFF. Otherwise, fatal injury can occur due to
DANGER
the high voltage caused from AC and DC cables.
Grounding the PV Strings needs below prerequisites:
CAUTION
An isolation transformer must be installed on the AC side of each inverter;
Ensure that the neutral wire of the isolation transformer must be disconnected from the
PGND cable.
One isolation transformer is with one PV inverter: do not install a single isolation transformer
for multiple inverters; otherwise, circulating current generated by the inverters will lead to
operation failure.
Select Isolation SET on the mobile APP, and set in Input Grounded, With TF.
5.1 Connecting Protection Ground (PGND) Cables
5.1.1 Preparation
The ground cable and OT terminals have been prepared with below requirements.
a. Ground cable: Outdoor copper-core cables with a cross sectional area of 16 mm2 or more
are recommended.
b. OT terminal: OT16-6.
OT16-6
key parameter
Product series code
Terminals product series code
Good grounding for the inverter helps resist the impact of surge
NOTE
voltage and improve the EMI performance. Connect the PGND cable
before connecting the AC power cables, DC power cables, and
communication cables.
19
NOTE
It is recommended that the ground cable be connected to a nearby
ground position. For a system with multiple inverters connected in
parallel, connect the ground points of all inverters to ensure
equipotential connections.
5.1.2 Wiring Procedures
Step 1 Remove an appropriate length of the insulation layer from the PGND cable using a wire
Stripper; the length is a little bit longer than that of OT terminal’s crimping end by 2mm~3mm,
as shown in Figure 5.1.
Figure 5.1 Stripped length (unit: mm)
Step 2 Insert the exposed core wires into the crimping areas of the OT terminal and crimp them
using hydraulic pliers, as shown in Figure 5.2.
Figure 5.2 Crimping a cable (unit: mm)
Step 3 Secure the PGND cable using the ground screw and tighten the screw to a torque of 3 N·m,
as shown in Figure 5.3.
Figure 5.3 Securing the PGND cable
20
5.2 Connecting AC Output Cables
5.2.1 Preparation
The AC power cable and AC terminals have been prepared with below requirements.
a. AC power cable: Outdoor multi copper-cores cables are recommended. Table 5.1 describes
the specifications.
Cross-sectional Area (mm )
2
Inverter Model
Cable type
17-22K
multi-core
outdoor cable
Range
6~16
Range
10
24~32
10~25
25-30K
Recommended
Value
Cable Outer
Diameter(mm)
16
Table 5.1 Cable specifications (recommended)
b. OT terminals:
The inverter requires M5 OT terminals and a cable with the maximum cross-sectional area of
25 mm .
2
NOTE
An independent three-phase circuit breaker must be installed on the
AC side of each inverter to ensure that the inverter can be safely
disconnected from the power grid.
WARNING
An independent three-phase circuit breaker must be installed on the AC
side of each inverter; Do not stall one circuit breaker for multiple inverters.
WARNING
Do not connect loads between the AC output terminals of the inverter
and circuit breaker.
21
5.2.2 Procedure of Connecting AC Cables
Step 1 Remove an appropriate length of the jacket and insulation layer from the AC output cable,
as shown in Figure 5.4.
L1
specification:M6
L2=L1+(2mm-3mm)
120(recommend)
Figure 5.4 Stripped length (unit: mm)
Step 2 Insert the exposed core wires into the crimp area of the OT terminal and crimp them
using hydraulic pliers. Wrap the wire crimp area with heat shrink tubing or PVC insulation tape,
as shown in Figure 5.5.
NOTICE
If heat shrinks tubing is used, put it through the power cable and then
crimp the OT terminal.
Heat shrink tubing
Figure 5.5 Crimping the OT terminal
22
Step 3 Loosen the four screws lock on AC OUTPUT door, and connect L1, L2, L3, N and PE
through AC OUTPUT terminal cover to the terminal block, use a screw driver to tighten screws
to a torque of 3N·m, as shown in Figure 5.6.
Figure 5.6 Tighten AC wire
Step 4 Lock the AC OUTPUT terminal shell back to the original position, Stretch all the lines on
the AC end naturally and then tighten the plug, as shown in Figure 5.7.
Figure 5.7 Tightening the wiring board
23
5.3 Connecting the PV Strings
DANGER
PV Strings connection needs below prerequisites; otherwise, an
electrical shock can occur.
PV modules generate electric energy when exposed to sunlight and can create an electrical
shock hazard. Therefore, when connecting the PV modules, shield them with opaque cloth.
Before connecting DC input power cables, ensure that the voltage on the DC side is within
the safe range and that the DC SWITCH on the inverter is OFF. Otherwise, high voltage
may result in electric shock.
When the inverter is grid-tied, it is not allowed to maintain DC input power cables, such as
connect or disconnect a string or a module in a string. Only after the inverter enters in
shutdown mode, it is allowable for preceding DC input power cables maintenance.
WARNING
Grounding the PV Strings needs below prerequisites; otherwise, a
fire can occur.
PV modules connected in series in each PV string must be of the same specifications.
The maximum open-circuit voltage of each PV string must be always lower than or equal
to its permitted range.
The maximum short circuit current of each PV string must be always lower than or equal
to its permitted range.
The positive and negative terminals of PV modules must be connected to the positive and
negative DC input terminals of the inverter respectively.
During the installation of PV strings and the inverter, the positive or negative terminals of
PV strings cannot be connected with short circuit.
24
5.3.1 Preparation
PV Strings DC input cable and connectors have been prepared with below requirements:
a. Route connecting for the installation of PV strings and the inverter is shown in Table 5.2
Input Route
Number of Input Route
Inverter model
1
Connected to any route
2
Connected to routes 1 & 4
3
Connected to routes 1 & 2 & 4
4
Connected to routes 1 & 2 & 4 & 5
5
Connected to routes 1 & 2 & 3 & 4 & 5
6
Connected to routes 1 & 2 & 3 & 4 & 5 & 6
17K-30K
Not applicable
for 17-22K
Table 5.2 Route connecting for the installation of PV strings and the inverter
b. DC input cables of PV Strings: Table 5.3 lists the recommended outdoor copper-core DC
input cable specifications.
Cross-sectional Area (mm )
2
Cable type
Range
Common PV cables in
the industry (model:
PV1-F)
Cable Outer Diameter (mm)
Recommended
Value
4~6
4
Table 5.3 Recommended DC input cable recommended specifications
25
Range
5~8
c. Connectors of PV Strings: Positive and negative DC input connectors are used, as shown
in Figure 5.8 and Figure 5.9.
PC
1
2
the insulation layer
locking nut
1
the insulation layer
Figure 5.8 Positive connector compositions
2
locking nut
Figure 5.9 Negative connector compositions
Positive and negative metal connectors are packed with positive and
NOTE
negative connectors respectively when shipped out. After unpacking,
keep the positive and negative ones separate to avoid confusion.
5.3.2 Procedure of connecting the PV Strings
Step 1 Remove an appropriate length of the insulation layer from the positive and negative
power cables using a wire stripper, as shown in below Figure.
Positive metal connector
Negative metal connector
Figure 5.10 Removing insulation layer for DC cable (unit: mm)
26
Step 2 Insert the exposed areas of the positive and negative power cables into the metal
terminals of the positive and negative connectors respectively and crimp them using a crimping
tool, as shown in Figure 5.11.
Figure 5.11 Crimping a metal connector
Step 3 Insert the crimped positive and negative power cables into the corresponding positive
and negative connectors until a "click" sound is heard, as shown in Figure 5.12.
Figure 5.12 Connecting positive and negative connectors
Step 4 Tighten the locking nuts on the positive and negative connectors using a removal
wrench, as shown in Figure 5.13.
Figure 5.13 Locking connectors
Step 5 Measure the voltage of every route Strings using a multimeter. Ensure that the polarities
of the DC input power cables are correct, as shown in Figure 5.14.
27
800 00
MAXMIN
Hz %
REL
CP
RANGE
!
hFE
10A MAX
!
FUSED
COM
FUSED
!
Figure 5.14 Checking the voltage of every route Strings
Step 6 Insert the positive and negative connectors into their corresponding terminals of the
CP
inverter until a "click" sound is heard, as shown in Figure 5.15.
PV+
PV-
Figure 5.15 Connecting to the inverter
Step 7 After connecting the PV strings, ensure that all connectors are in position by checking
for resistance when a slight pull is applied.
5.4 Connecting Communication Cables
5.4.1 Communication Mode Description
You can use the following communication modes to implement communication: Bluetooth,
WIFI, all of which are described as follows.
Bluetooth Module
You can turn on the Bluetooth function of the mobile phone, and set parameters and
monitor data of the inverter through the mobile APP.
28
WIFI Module
Following figure show inverter’s interface to connect WIFI accessory, please refer user manual
of accessory for connecting method and its setting.
Module
Function description
WIFI
WIFI module implements communication with Cloud server through
wireless network to monitor PV inverter's data status.
For more details, refer to WIFI Product Application Manual.
NOTE
You can buy WIFI communication modules from our company.
Table 5.4 WIFI & GPRS & RS485 Modules Description
5.5 Installation Verification
Check the following items after the inverter is installed according to Table 5.5.
1. No other objects put on the PV inverter.
2. All screws, especially the screws used for electrical connections, are tightened
3. The PV inverter is installed correctly and securely.
4. Ground, AC, DC, and Communications cables are connected tightly/correctly and securely.
5. Check there is no open circuit or short-circuits at AC and DC terminals using multimeter.
6. Waterproof connectors at AC terminals and RS485 ports are plugged with waterproof
plugs tightly.
7. Covers at AC terminals are tightened.
8. Idle terminals are sealed.
9. All safety warning symbols are intact and complete on the inverter.
Table 5.4 Self-check items after installation
29
6 System Operation
6.1 Powering ON the Inverter
Step 1: Switch ON the AC circuit breaker.
Step 2: Set the DC SWITCH of the inverter to ON.
Step 3: Observe statuses of LED indicator lights on the inverter according to Table 7.2.
NOTE
When LED status lights display the inverter has entered
grid-connecting, it means the inverter is operating well. Any query
during operating the PV inverter, call your dealer.
6.2 Powering OFF the Inverter
Step 1: Switch off the circuit breaker at AC terminal.
Step 2: Set the DC SWITCH to OFF.
WARNING
After the inverter powers off, the remaining electricity and heat may
still cause electrical shock and body burns. Please only begin
servicing the inverter ten minutes after the power-off.
30
7 User Interface
Display screen of inverter is composed of LED indicator and LCD (LCD is optional for some
models of inverter). LED indicator includes PV Indicator, Grid Indicator, COM Indicator, and
Warning Indicator.
1. PV indicator
2. Grid indicator
3. COM indicator
4. Warning indicator
LED indicator Status
on
PV Indicator
Grid
Indicator
COM
Indicator
Warning
Indicator
Description
Voltage of PV strings meet the conditions for feed-in
operation.
blink
Voltage of PV strings does not meet the conditions for
feed-in operation.
blink
Power grid abnormal. The conditions for feed-in operation are
not yet met.
Feed-in operation. The blink times (every cycle lasts 30s) of the
grid indicator present power size, and after that the indicator
keeps ON.
on
blink
off
on/blink
off
When less than 20% rated power, blink one time;
20%~40% rated power, blink twice;
40%~60% rated power, blink three times;
60%~80% rated power, blink four times;
80%~100% rated power, blink five times.
Communication data transmission is underway.
No external communication is connected or no communications
data transmission.
Refer LED status in warning table
No warning
Table 7.1 LED indicator
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View Inverter status
The inverter operation status can be obtained from observing LED indicator status. For more
details, refer to Table 7.1 LED indicator status.
View and Set Inverter running data
The inverter operation data can be obtained from the mobile APP downloaded
through Bluetooth communication. For more details, refer to the APP User Manual.
Warning
PV
Grid
COM
Warning
code indicator indicator indicator indicator
Normal status
Starting up
WLAN/WI-FI/RS485 communication
PV normal
Grid over voltage
A0
Grid under voltage
A1
Grid absent
A2
Grid over frequency
A3
Grid under frequency
A4
Grid unbalance
A6
PV over voltage
B0
PV under voltage
B4
Weak radiation
B5
Strings abnormal
B3
Inverter over temperature
C5
Fan abnormal
C8
Insulation resistance abnormal
B1
Leakage current abnormal
B2
Strings reverse
B7
Control power abnormal
C0
DC bias current abnormal
C2
Inverter relay abnormal
C3
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Leakage current HCT abnormal
C6
System fault
C7
DC link voltage unbalance
C9
DC link over voltage
CA
Internal Communications Fault
CB
Software version incompatibility
CC
EEPROM fault
CD
Sampling inconsistency
CE
Invert circuit abnormal
CF
Boost circuit abnormal
CG
Table 7.2 LED indicator status for common fault of the inverter
Note: ● means light ON, ○ light off
blink
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keep original status.
8 Maintenance
WARNING
Before maintaining and commissioning inverter and its peripheral
distribution unit, switch off all the charged terminals of the inverter
and wait at least 10 minutes after the inverter is powered off.
8.1 Routine Maintenance
Maintain
content
Check Item
Check Content
inverter output
status
Statistically maintain the status of
electrical yield, and remotely monitor
its abnormal status.
PV inverter
cleaning
Check periodically that the heat sink is Clean periodically
free from dust and blockage.
the heat sink.
Check that the inverter is not damaged
PV inverter
running
status
PV inverter
Electrical
Connections
or deformed.
Check for normal sound emitted during
inverter operation.
Check and ensure that all inverter
communications is running well.
Check that AC, DC, and communications
cables are securely connected;
Check that PGND cables are securely
connected;
Check that cables are intact and there
are not wire aging;
NA
If there is any
abnormal
phenomenon,
replace the
relevant parts.
If there is any
abnormal
phenomenon,
replace the cable
or re-connect it.
Table 8.1 Maintenance checklist and interval
34
Maintenance
Interval
Weekly
yearly
monthly
Semiannually
8.2 The Inverter Troubleshooting
When inverter enters in shutdown mode abnormally, the alarm light is illuminated. Table 8.2
describes the troubleshooting measures for common fault alarms in the inverter.
Alarm Name
Causes
Measures Recommended
The grid voltage
exceeds its
allowable range.
1. If the alarm occurs accidentally, possibly the
power grid is abnormal accidentally. No extra
action is needed.
2. If the alarm occurs repeatedly, contact the local
power station. After receiving approval of the local
power bureau, revise the electrical protection parameters
setting on the inverter through the mobile APP.
3. If the alarm persists for a long time, check whether
the AC circuit breaker / AC terminals is disconnected
or not, or if the grid has a power outage.
Grid
Over Voltage
Grid
Under Voltage
Over
Frequency
Under
Frequency
PV Over
Voltage
PV modules input
voltage exceeds
Check the number of PV modules and adjust it if need.
the inverter’s
allowable range.
PV Under
Voltage
PV modules input 1. When sunlight intensity weakens, PV modules
voltage is under voltage decreases. No action is needed.
the inverter’s
2. If such phenomena occur when sunlight intensity
defaulted
does not weaken, check if there is short circuit, open
protection value. circuit etc. in the PV strings.
Insulation
Resistance
Abnormal
A short circuit
exists between
PV strings and
protection ground.
PV strings are
installed in a
long-term moist
environment.
1. Check the insulation resistance against the ground
for the PV strings. If a short circuit has occurred,
rectify the fault.
2. If the insulation resistance against the ground is
less than the default value in a rainy environment, set
Insulation resistance protection on mobile APP.
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Residual
Current
Abnormal
PV Strings
Abnormal
The insulation
resistance against
the ground at the
input side
decreases
during the inverter
operation, which
causes excessively
high residual
current.
PV strings have
been shielded for
a long time.
PV strings are
deteriorating.
1. If the alarm occurs accidentally, possibly the external
circuits are abnormal accidentally. The inverter
automatically recovers to the normal operating status
after the fault is rectified.
2. If the alarm occurs repeatedly or lasts a long time,
check whether the insulation resistance against the
ground of PC strings is too low.
1. Check whether the PV string is shielded.
2. If the PV string is clean and not shielded, check
whether the PV modules are aging or deteriorated.
The cables of PV
PV Strings
Reverse
BUS Under
Voltage
strings are
Check whether the cables of PV strings are correctly
connected
connected. If they are connected reversely, reconnect
reversely during the the cables.
inverter installation.
Abnormal internal
energy control
BUS Over Voltage imbalance has
been triggered by
Invert Module
the PV Strings/grid
Fault
sharp change of
working conditions
BOOST Fault
EEPROM Fault
EEPROM
Component
damaged
Zero power
generation and
Yellow alarm light Communications
outage
illuminating in
remote monitor
system
1. If the alarm occurs occasionally, the inverter can
automatically recover to the normal operating status
after the fault is rectified.
2. If the alarm occurs repeatedly, contact your dealer
for technical support.
Replace the monitoring board.
If modem or other data logger is used, please reboot
it; if still does not work after rebooting, contact your
dealer.
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remote monitor
displays zero
power generation
Communications
outage
remote monitor
Output switch
displays no output
tripping
voltage
Inverter off grid
If modem or other data logger is used, please reboot
it; if still does not work after rebooting, contact your
dealer.
Check if DC switch is damaged, and if not, switch it to
ON. If it still doesn’t work, contact your dealer.
1. Power grid fault; 1. Wait till power is restored;
2. DC switch
2. Turn DC switch to ON, and if DC switch trips a lot,
tripping
contact your dealer.
Table 8.2 Common troubleshooting measures
NOTE
If you cannot clear the preceding alarm according the measures
recommended, contact your dealer timely.
8.3 Removing the Inverter
Perform the following procedures to remove the inverter:
Step 1: Disconnect all cables from the inverter, including communications cables, DC input
power cables, AC output power cables, and PGND cables, as shown in Figure 8.1.
Figure 8.1 Removing DC input connector
Notes:
When removing DC input connector, insert the removal wrench to the bayonet, press the
wrench down, and take out the connector carefully.
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Step 2: Remove the inverter from the rear panel.
Step 3: Remove the rear panel.
WARNING
Before removing DC input connector, double check DC input switch
is turned to OFF to avoid inverter damage and personal injury.
Fan Maintenance
External FANs are provided for 25K/28K/30K models, check the heat sink and the inlet/outlet
of external FANs periodically, clean them, and ensure that they are free from dust and
blockage. If any abnormal with a FAN, please replace it.
The inverter is equipped with in-built PV FUSE , if any warning display that the FUSE is melt,
disconnect AC breaker, and switch the DC switcher to OFF, then pull out all DC input strings,
wait at least 10 minutes after the inverter is powered o#. Then open panels of the inverter,
identify the melt FUSE using multi-meter, and replace it; install the panels, tighten the screws
of the inverter, and restart the inverter.
DANGER
When replacing the FUSE, be sure to unplug all the DC input
group terminals of the inverter, otherwise there will be a danger of
electric shock.
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9 Disposal of the Inverter
The PV inverter and its packing case are made from environment-friendly materials. If the
inverter service life has expired, do NOT discard it with household garbage; dispose the
inverter in accordance with local environmental laws and regulations.
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10 Technical Specifications
Model
GT3-17K-D
GT3-20K-D
GT-22K-D
Efficiency
Max. Efficiency
98.2%
European Efficiency
97.7%
Input(PV)
Max. Input Voltage
1000V
Rated Input Voltage
620V
Max. Input Current
50A (25A/25A)
Max.Short Circuit Current
60A(30A/30A)
Start Input Voltage/Min. Operating Voltage
250V/180V
MPPT Operating Voltage Range
180V-960V
MPPT Operating Voltage Range (Full-Load)
480V-800V
Max. Number of PV Strings
4(2/2)
No. of MPPTs
2
Output(Grid)
Rated AC Active Power
17,000W
20,000W
22,000W
Max. AC Apparent Power
18,700VA
22,000VA
24,200VA
Max. AC Active Power (PF=1)
18,700W
22,000W
24,200W
Max. AC Output Current
3*28.3A
3*33.5A
3*35A
Rated AC Voltage
380V/400V,3W+N+PE
AC Voltage Range
277V-520V(adjustable)
Rated Grid Frequency
50Hz/60Hz
Grid Frequency Range
45Hz-55Hz/55Hz-65Hz
THDI
<3%（Rated Power）
DC Current Injection
Power Factor
<0.5%In
> 0.99 Rated power (Adjustable 0.8 Leading - 0.8Lagging)
Protection
DC switch
Support
Anti-islanding protection
Support
AC overcurrent protection
Support
AC short circuit protection
Support
DC reverse connection
Support
Surge Arrester
DC Type II /AC Type II
Insulation detection
Support
Leakage current protection
Support
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General
Topology
Transformerless
IP Rating
IP65
Night Self Consumption
<1W
Cooling
Natural cooling
Operating Temperature Range
-25℃~60℃(up to 45°C without derating)
Relative Humidity Range
0-100%
Max. Operating Altitude
4000m(>2000m derating)
Noise
<30dB(Measured at 1m)
Dimensions (W*H*D)
555*446*270 mm
37kg
Weight
HMI & COM
APP +LED
Display
Bluetooth,WiF,RS485
Communication
41
Model
GT3-25K-D
GT3-28K-D
GT3-30K-D
Efficiency
Max. Efficiency
98.2%
European Efficiency
97.7%
Input(PV)
Max. Input Voltage
1000V
Rated Input Voltage
620V
Max. Input Current
75 A (37.5A/37.5A)
Max.Short Circuit Current
84A(42A/42A)
Start Input Voltage/Min. Operating Voltage
250V/180V
MPPT Operating Voltage Range
180V-960
MPPT Operating Voltage Range (Full-Load)
480V-800V
Max. Number of PV Strings
6(3/3)
No. of MPPTs
2
Output(Grid)
Rated AC Active Power
25,000W
28,000W
30,000W
Max. AC Apparent Power
27,500VA
30,800VA
33,000VA
Max. AC Active Power (PF=1)
27,500W
30,800W
33,000W
3*40A
3*45A
3*48A
Max. AC Output Current
Rated AC Voltage
380V/400V,3W+N+PE
AC Voltage Range
277V-520V(adjustable)
Rated Grid Frequency
50Hz/60Hz
Grid Frequency Range
45Hz-55Hz/55Hz-65Hz
THDI
<3%（Rated Power）
DC Current Injection
Power Factor
<0.5%In
> 0.99 Rated power (Adjustable 0.8 Leading - 0.8Lagging)
Protection
DC switch
Support
Anti-islanding protection
Support
AC overcurrent protection
Support
AC short circuit protection
Support
DC reverse connection
Support
Surge Arrester
DC Type II /AC Type II
Insulation detection
Support
Leakage current protection
Support
General
Topology
Transformerless
IP Rating
IP65
Night Self Consumption
<1W
42
Cooling
Fan cooling
Operating Temperature Range
-25℃~60℃(up to 45°C without derating)
Relative Humidity Range
0-100%
4000m(>2000m derating)
Max. Operating Altitude
<50dB(Measured at 1m)
Noise
Dimensions (W*H*D)
555*446*270 mm
Weight
40kg
HMI & COM
APP +LED
Display
Bluetooth,WiFi,RS485
Communication
Notes:
1) Grid power voltage range can be set according to national voltage standards;
2) Power grid frequency range can be set according to national grid standards
3) The preceding technical specifications are subject to change without prior notice. The
listed specifications are for your reference only.
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