On grid inverter 50K Series 3 Phase Grid Tied PV String Inverter User Manual

THREE PHASE GRID-TIED
PV STRING INVERTER
50-60K

User Manual

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Dear User,
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

• 50K
• 60K

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. The latest version of user manual and other more information about the product are available from and/or by consulting your dealer.

Symbol Conventions
Safety symbols used in this manual, which highlight potential safety risks and important safety information, are listed as follows:

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 to documentation (Remind operators to refer to the documentation shipped with the inverter).

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
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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 if damage is caused by installation faults.
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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)

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.
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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.
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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.
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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 US immediately, if there is any issue found during operation.
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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.
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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 50K as an example.

2.2 Network Application
2.2.1 Grid-tied PV Power Systems
This series applies to grid-tied PV power systems for industrial / commercial rooftops, fishing / farmers light complementary power generation systems, and large ground-based power stations. Typically, these series inverters are used in low-voltage grid-tied PV power system, as shown in Figures 2.2&2.3

2.3 Outline and Dimensions
2.3.1 Outline
Figures 2.4 to 2.6 show the outline of the inverters as follows:

2.3.2 Dimensions
Figures 2.7 shows the dimensions of these series inverters as follows:

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.

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

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°C to +70°C 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 six 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.

Installation

DANGER| Do not install the inverter on flammable building materials or in an area that stores flammable or explosive materials.
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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 electrica 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.

rear panel)

Figures 4.1 The deliverables: The inverter and its fittings

NOTICE| If any damage mentioned above is found, contact the dealer immediately.
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4.2 Moving the 50K / 60K
After checking the outer packing, move the PV inverter to the designated installation position horizontally. Hold the handles on both sides of the inverter, as shown in Figure 4.2.

CAUTION| The inverter is relatively heavy! To prevent device damage and persona caution injury, arrange two people to move the inverter and handle with care.
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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 man 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, communications/ technical specifications, and compliance symbols.

4.3.2 Compliance and Safety Symbols

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 acrd f or Waned electrical technicians are allowed to perform operettas on the iinitertler
| 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, two kinds of physical installation are described below in detail: Support-mounting & wall-mounting.

4.4.1 Determining the Installation Position
Basic Requirements
a. The inverter is protected to IP65 and can be installed indoors or outdoors.
b. 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°C which ensures the inverter’s optimal operation and extends its service life.
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.

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.

c. 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 or in stacked mode (as shown in Figure 4.6) if no sufficient space is available. The installation modes ensure sufficient space for installation and heat dissipation.

NOTICE| The clearance between multiple inverters must be increased to ensure proper heat dissipation when they are installed in a hot area.
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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 Figures 4.7&4.8.

 NOTICE| The wrong installation will lead to failure of the inverter operation.
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4.5 Support-mounting the Inverter
Step 1 Move out the rear panel from the packing case, and determine the positions for the inverter and the support, shown as in Figure 4.9.

Step 2 Tighten the rear panel with the support using M12 bolt to a torque of 42 N.m (as shown in Figure 4.10).

Step 3 Mount the inverter on the support and tighten the inverter with rear panel using screws, as shown in Figure 4.11.

4.6 Installation Self-check

• Ensure that the three supporting points (on the rear side of the inverter) align with the three holes of the support;
• Ensure that the inverter is well fixed;
• Ensure that the inverter in locked on the support and an antitheft lock is installed.

Electrical Connections

DANGER| Before performing any electrical connections, ensure that both DC and AC Switches are OFF. Otherwise, fatal injury can occur due to the high voltage caused from AC and DC cables.
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 CAUTION| Grounding the PV Strings needs below prerequisites:

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 ONESTO Solar 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 multi-core special cables are recommended.
b. OT terminal: OT terminals OT 35~50-6.

NOTE| Good grounding for the inverter helps resist the impact of surge voltage and improve the EMI performance. Connect the PGND cable before connecting the AC power cables, DC power cables, and communications cables.
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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.
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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.

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.

Step 3 Remove the ground screws from the ground points, secure the PGND cable (done by step 1 & 2) using the ground bolts, and tighten the bolts to a torque of 5 Nem using a socket wrench, as shown in Figure 5.3. PE wire must be well grounded to ensure that impedance between Neutral wire and Earth wire be less than 10Ω.

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.

| Cable type| Cross-sectional Area of single strand (mm2)| Recommended OT terminals| Notes
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AC terminal| 5-core outdoor special cable| 30-50| 0735-50-8| The distances between AC terminal and gridconnection is no more than 200m.
4-core outdoor special cable
Protection Ground (PGND) Cables| multi-core
outdoor special cable| 30-50| OT35-50-8| Terminal connection

Table 5.1 Cable specifications (recommended)

b. AC wiring terminals: 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. Do not install leakage current protection switch in the inverter system, and if for special reasons leakage current protection switch is a must between inverter output terminal and power grid, please install a model B leakage current protection switch with no less 600 mA current. Do not share neutral wire when B leakage current protection switch is stalled, or else a power grid trip may occur.

WARNING| An independent three-phase circuit breaker must be installed on the AC a side of each inverter, Do not stall one circuit breaker for multiple inverters
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WARNING| Connect loads to the AC output terminals of the inverter through warning circuit breaker.

5.2.2 Procedure of Connecting AC Cables
AC wiring chamber in on the right side of the inverter, and before AC wiring, remove these four retaining screws, uninstall Earth wire, and remove the cover of AC wiring chamber. Please follow below steps to ensure equipment and personal safety.

Step 1 Remove an appropriate length of the jacket and insulation layer from the AC output cable. Insert the exposed core wires into the crimp area of the OT terminal, wrap the wire crimp area with heat shrink tubing or insulation tape, and crimp them using hydraulic pliers;
Step 2 Loosen the locking cap from the AC OUTPUT waterproof cable connector at the bottom of the inverter and remove the plug from the locking cap.
Step 3 Route the AC output power cable into the locking cap and the AC OUTPUT connector at the inverter bottom, and connect the AC cable to L1, L2, L3, N, and E on the AC terminal block, tighten them using screw driver and the required torque is 12 N.m;
Step 4 Tighten the locking cap on the AC OUTPUT waterproof cable connector to a torque of 12 N.m;
Step 5 Tighten the four screws on the cover to a torque of 3 N.m.

 NOTICE| For operation convince and safety, the inverter requires multi- stranded wire and crimping terminals with a proper crimping tool before wiring.
To avoid potential risk, 125A /400VAC overcurrent protection device is recommend to add on the output terminal.
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5.3 Connecting the PV Strings

 DANGER| PV Strings connection needs below prerequisites; otherwise, an electrical shock can occur.
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PV modules generate electric energy when exposed to sunlight and can create an electrica 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.
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 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.

5.3.1 Preparation
PV Strings DC input cable and connectors have been prepared; refer to No. of DC input terminals at the bottom of inverter shown in below figure: 50K with 10 routes and 60K with 12  routes, if quantity of PV strings is less than number of input on inverter, you can refer to below Table for the installation of PV strings and the inverter.

50K
12| Connected to routes 2,3, 4, 6, 7,8, 9, 10, 11, 12,13 & 14

Table 5.2 Route connecting for the installation of PV strings and the inverter

• Connectors of PV Strings: Positive and negative DC input connectors are used, as shown in Figure 5.6 and Figure 5.7.
  NOTE| Positive and negative metal connectors are packed with positive and negative connectors respectively when shipped out. After unpacking, keep the positive and negative ones separate to avoid confusion.
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• Procedures 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.
  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 5.9.
  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 5.10.
  Step 4 Tighten the locking nuts on the positive and negative connectors using a removal wrench, as shown in Figure 5.11.
  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 5.12.
  Step 6 Insert the positive and negative connectors into their corresponding terminals of the inverter until a “click” sound is heard, as shown in Figure 5.13.
  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 Communications Cables
5.4.1 Communications Mode Description
You can use the following communications modes to implement communications: Bluetooth, WIFI, GPRS, and RS4885, 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 SolarTouch .
For details about operation, refer to APP User Manual.

WIFI & GPRS & RS485 Modules
Following figure show inverter’s interface to connect WIFI, GPRS and RS485 accessory, please refer user manual of accessory for connecting method and its setting.

network to monitor PV inverter’s data status.
For more details, refer to WIFI Product Application Manual.
GPRS| GPRS module implements communication with Cloud server through cellular to monitor PV inverter’s data status.
For more details, refer to GPRS Product Application Manual.
RS485| RS485 switching module monitors PV inverter’s data status through collecting and uploading data to Cloud server.
For more details, refer to RS485 switching Product Application Manual.
NOTE| You can choose and buy WIFI / GPRS / RS485 communication modules from SolarMG
WIFI / GPRS / are available from SolarMG

Table 5.3 WIFI & GPRS & RS485 Modules Description

 WARNING| Only permitting to connect inverter’s communication interface with man the original WIFI / GPRS accessory, the third WIFI / GPRS accessory could damage inverter and no warranty could be provided.
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RS485 communications mode (for single inverter)
When RS485 communications mode is applied to monitor the inverter, there are two ways for connecting to the inverter: connecting to single inverter and to multiple inverters. Figure 5.14 demonstrates connection to single inverter to implement RS485 communications.

RS485 communications mode (for multiple inverters)

NOTE|

If multiple inverters are connected, note the following:

1. No need for re-setting Modbus address and the address can be allocated automatically if V1000 data logger is used. Otherwise, you need to re-set Modbus address manually through SolarTouch solar APP if other brand data logger is used.
2. Turn RS485 Resistance to ON from the dial switch of the inverters on the end of the chain.
3. Ensure that the appropriate length of communications cable between every two inverters is less than 200m and communications cable must be separated from other power cables to avoid communications interference.

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5.4.2 Connecting RS485 Communications Cables
The inverter case right side is located interface of RS485 communications cable, as shown in 5.16.

Step 1 Remove the wiring chamber on the right of inverter, and loosen the locking cap on 485 waterproof cable connector from the bottom of inverter.
Step 2 Remove an appropriate length of the insulation layer from the communications cable, loosen screw lock to take out panel, insert the cable to the waterproof cable connector, and tighten the locking cap.
Step 3 Connect RS485 differential positive and negative signal of data logger to terminal 1A and 1B of inverter, and connect terminal 2A and 2B of the inverter to terminal 1A and 1B of another inverter.

NOTE| To prevent corrosion, apply silica gel or fireproof mud to the terminal or interface after connecting external PGND cables, AC cables, RS485 port, and Ethernet port.
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9.4.3 Setting RS485 Communications Address
Step 1 scanning below QR code. And then login SolarTouch solar and register an account for your inverter.

http://www.cloudinverter.net/App_index.php

Step 2 Click the Extension key, and select Setting in the prompt manual, as shown in Figure 5.18.

Step 3 Check the Modbus address in Figure 5.19, the default address is 1, long click to revise the address and save it, the inverter at same RS485 bus must be set a unique address.

Step 4 You can set Mach Resistance of the end of multi-RS485 connection chain, as showed in Figure 5.20.

5.5 Installation Verification
Check the following items after the inverter is installed according to Table 5.4.

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

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.
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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.
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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.

grid-connecting to generate power.
blink| Voltage of PV strings can’t meet the requirements for inverter grid- connecting to generate power.
Grid Indicator| blink| Power grid abnormal, and can’t meet the requirements for inverter grid-connecting to generate power.
on| When grid-on, the blink (every cycle last 305) of Grid Indicator means loading amounts: quantity of blink means power size, and after that the Indicator keeps ON.
When less than 20% rated power, blink one time;
20%-40% rated power, blink twice every 30s;
40%-60% rated power, blink three times every 30s;
60%-80% rated power, blink four times every 30s;
80%-100% rated power, blink five times every 30s.
COM Indicator| blink| Communications data transmission is underway.
off| No external communications is connected or no communications data transmission.
Warning Indicator| on/blink| Refer LED status in warning table
off| No warning

Table 7.1 LED indicator

LCD Screen

1. COM
   When WIFI/GPRS/Bluetooth is transferring data, icon will be ON, while no data transmission, the icon will be off after 10s. When RS485 is transferring data, icon will be ON, while no data transmission, the icon will be off after 10s.

2. Warning
   When warning is triggered, icon will be illuminated: from left to right the first bit could be (A)/ (b)/ (C), it stands for warning type, and the second bit is warning code, please refer to warning code in table 7.2 for details.

3. Date
   When external communications is normal and time zone is set correctly, the built-in clock of inverter will be synchronized with server’s time.

4. Status
   Icon stands for PV strings; when inverter is standby status, MPPT voltage of the PV string will be displayed in Meter zone.
   Icon stands for grid; when voltage and frequency of power grid is in normal range, the icon keeps on, or else, it blinks; when there is no voltage, the icon will be off.
   Icon stands for energy flow; when inverter is in normal status, the icon will be on, or else it will be off.

5. Meter
   Normal status: today and total energy, MPPT voltage and current are showed in turn.|
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   Standby status: counter down value before inverter start up.|
   Any status: setting parameters via APP, the screen keep for 5 seconds.|

6. Output
   **** Normal status: output power, grid voltage and current are showed in turn.|
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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 SolarTouch ; mobile phone APP downloaded through Bluetooth communications. For more details, refer to SolarTouch * Manual.

| Warning
code| PV
indicator| Grid
indicator| COM
indicator| Warning indicator
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Normal status| | | | |
Starting up| | | | |
WLAN/WI-FI/RS485 communication| | | | |
PV normal| | | | |
Grid over voltage| AO| | | |
Grid under voltage| Al
Grid absent| A2| | | |
Grid over frequency| A3
Grid under frequency| A4
Grid unbalance| A6
PV over voltage| BO| | | |
PV under voltage| B4
Weak radiation| 85
Strings abnormal| B3| | | |
Inverter over temperature| C5
Fan abnormal| C8
Insulation resistance abnormal| B1| | | |
Leakage current abnormal| B2| | | |
Strings reverse| B7| | | |
Control power abnormal| CO| | | |
DC bias current abnormal| C2| | | |
Inverter relay abnormal| C3| | | |
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 keep original status.

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.
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8.1 Routine Maintenance

Check Item| Check Content| Maintain content
Maintenance| Interval
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inverter output status| Statistically maintain the status of electrical yield, and remotely monitor its abnormal status.| NA| Weekly
PV inverter cleaning| Check periodically that the heat sink is free from dust and blockage.| Clean periodically the heat sink.| yearly
PV inverter running status| Check that the inverter is not damaged or deformed.
Check for normal sound emitted during inverter operation.
Check and ensure that all inverter communications is running well.| If there is any
abnormal
phenomenon, replace the relevant parts.| monthly
PV inverter Electrical Connections| 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;| If there is any abnormal phenomenon, replace the cable or re-connect it.| 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.

Grid
Over Voltage| 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 SolarTouch 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
Under Voltage
Over Frequency
Under Frequency
PV Over Voltage| PV modules input voltage exceeds the inverter’s allowable range.| Check the number of PV modules and adjust it if need.
PV Under Voltage| PV modules input voltage is under the inverter’s defaulted protection value.| 1. When sunlight intensity weakens, PV modules voltage decreases. No action is needed.
2. If such phenomena occur when sunlight intensity does not weaken, check if there is short circuit, open 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 SolarTouch
Residual Current
Abnormal| The insulation resistance against he ground at the input side decreases
during the invader operation, which reuses excesevely high residual °rent.| 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 lime, check whether the insulation resistance against the ground of PC strings is too low.
Strings PV S
Abnormal| PV strings have bee n shielded for a long time.
PV strings are deteriorating.| 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.
PV Strings Reverse| The cables of PV strings are connected reversely during the
inverter installation.| Check whether the cables of PV strings are correctly connected. If they are connected reversely, reconnect the cables.
BUS Under Voltage| Abnormal internal energy control rebalance has been triggered by the PV & nagsIgnd sharp change of working conditions| 1.If the alarm occurs occasionally, the inverter can automatically recover to the normal operating status after the fault is rectified.
2.It the alarm occurs repeatedly, contact your dealer for technical support.
BUS Over Voltage
Invert Module Fail
BOOST Fault
EEPROM Fault| EEPROM Component damaged| Replace the monitoring board.
Zero power generation and Yellow alarm light illuminating in moto monitor system| Communications outage| If modem or other data logger is used, please reboot it; if still does not work after rebooting, contact your dealer.
remote monitor displays zero power generation| Communications
outage| If modem or other data logger is used, please reboot it; if still does not work after rebooting, contact your dealer.
remote monitor displays no output voltage| Output switch
tripping| Check if DC switch is damaged, and if not, switch it to ON. If it still doesn’t work, contact your dealer.
Inverter off grid| 1. Power grid fault
2. DC switch tripping| 1. Wait till power is restored;
2. Turn DC switch to ON, and if DC switch trips a lot, 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.
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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.

Notes:
When removing DC input connector, insert the removal wrench to the bayonet, press the wrench down, and take out the connector carefully.

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.
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Fan Maintenance
Outer fan is added to cool the inverter, check periodically and ensure that air inlet and outlet of fan is free from dust and blockage; check whether the ambient temperature of the inverter exceeds the upper limit. If yes, improve ventilation to decrease the temperature. If there is any abnormal noise emitted from the fan, replace the relevant parts timely.
PV FUSE is in-built in the inverter, if any warning display that the FUSE is melt, disconnect AC breaker, and switch off DC switcher to OFF; pull out all DC input strings, wait at least 10minutes after the inverter is powered off. Then open both right and left frontal panels of the inverter, identify the melt FUSE using multi-meter, and replace them, install the panels, tighten the screws of invert, and restart the inverter.

Quality Guarantee

9.1 Quality Terms

1. Where otherwise agreed to in a contract, quality warranty period of the inverter is 60 months
2. As for the PV inverter which is defective or damaged within its quality warranty period, we shall repair or replace it for free.
3. The defective / damaged PV inverter replaced must be returned.

9.2 Liability Waiver
Warranty or liability will be void if damage is caused from below operations / situations. If customer asks for maintenance service, we can, at its discretions, provide paid service.

1. The warranty period expired;
2. The damage caused during transit;
3. The damage caused by man;
4. The damage caused by force majeure including, but not restricted to the following: earthquake, flood, fire, explosion, debris flow etc.
5. Operation in adverse environments beyond that described in the User Manual;
6. Any installation and operation environment beyond the relevant national standards;
7. Any installing, reconfiguring, or using faulty;
8. Any revising the product or modifying its software code without authorization;
9. Maintenance faulty caused by the technician personnel unauthorized bySolarMG
10. Any operation ignoring the safety precautions stipulated in the User Manual.

Disposal of the Inverter

The PV inverter and its packing case are made from environmental protection material. If the inverter service life has expired, do NOT cut it away with household garbage; dispose the
inverter in accordance with local rules for disposal of electrical equipment waste.

Technical Specifications

Input(PV)
Max. Input Voltage| 1100V
Max. PV configuration (STC)| 150%
Rated Input Voltage| 620V
Max. Input Current| 130A (39A/39A/26A/26A)| TOBA (S9A/39A/39A/39A)
Max.Short Circuit Current| 150A (45A/45A/30A/30A)| 180A (45A/45A/45A/45A)
Start Input Voltage| 250V
MPPT Operating Voltage Range| 200V-1000V
Max. Number of PV Strings| 10 (3/3/2/2)| 12 (3/3/3/3)
No. of MPPTs| 4
Output(Grid)
Rated AC Active Power| 50,000W| 60,000W
Max. AC Apparent Power| 55,000VA| 66,000VA
Max. AC Active Power (PF=1)| 55,000W| 66,000W
Max. AC Output Current| 376A| 392A
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 (Adjustable)
THDI| <3% (Rated Power)
DC Current Injection| <0.5%ln
Power Factor| >0.99 Rated power (Adjustable 0.8 LD – 0.8 LG)
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 Il
Insulation detection| Support
Leakage current protection| Support
General
Topology| Transformerless
IP Rating| IP65
Night Self Consumption| <1W
Cooling| Fan cooling
Operating Temperature Range| -25°C-60°C
Relative Humidity Range| 0-100%
Max. Operating Altitude| 4000m
Noise| <62dB
Dimensions (WHD)| 855mm555mm275mm
Weight| 74kgs
HMI & COM
Display| Wireless & APP+LED, LCD (Optional)
Communication| RS485, Optional: WiFi / GPRS / 4G / LAN
Certification
Safety| IEC62109-1/2
Grid Code| IEC 61000-1/2/3/4, IEC 61727/62116, CEI 021, CEI016
Warranty| 5 Years

Remarks:

• 1, 2 The range of output voltage and frequency may vary depending upon different grid codes.
• Specifications are subject to change without advance notice.

Technical Assistance

SolarMG offers a technical assistance and consultancy service.
To take advantage of this service, the following number is active: 055911077,
Or by writing to the email: support@solarmg.it

REV.1 — Preliminary
S.MG-OM:SG 50-60T

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