DT/SDT SERIES USER MANUAL SOLAR INVERTER

3.1 Grid Compatibility

DT series (GW10KLV-DT ~ GW25K-DT) and SDT series support four different types of grid.

TN-S Transformer: L1 L2 L3 N PE, PE Inverter

TN-C Transformer: L1 L2 L3 PEN, PE Inverter

TN-C-S Transformer: L1 L2 L3 N PE, PE Inverter

TT Transformer: L1 L2 L3 N, PE Inverter

Note: For TT grid structure, RMS voltage between neutral wire and earth wire must be less than 20V.

3.2 Inverter Overview

DT series

Diagram Description: The DT series inverter front panel shows several components labeled with numbers.

• 1. PV input Terminal
• 2. DC Switch (Optional)
• 3. CT & DRED / Remote Shutdown Port (Optional)
• 4. RS485 / External WiFi Module / USB Port
• 5. AC Output Terminal
• 6. Indicator Lights
• 7. LCD
• 8. Button

SDT series

Diagram Description: The SDT series inverter front panel shows several components labeled with numbers.

• 1. PV Input Terminal
• 2. Waterproof Vent
• 3. DC Switch (Optional)
• 4. RS485 Port / External WiFi Module And USB Port
• 5. CT & DRED / Remote Shutdown Port (Optional)
• 6. AC Output Terminal
• 7. Indicator Lights
• 8. LCD
• 9. Button

Note: The appearance of some SDT series inverters will be different.

3.3 Package

The inverter package typically includes:

• [1] Positive & Negative DC plug: Quantity varies by model (e.g., DT15~20KW: 4 pairs; 12KWLV: 4 pairs; 15KWLV, 25KW: 6 pairs; SDT4~10KW: 2 pairs; SDT 15KW&10KL: 3 pairs).
• [2] 2-Pin terminal (Optional): For Anti-Current (SDT4~10KW: 1pcs; SDT10KL&15KW: 1pcs; DT: 1pcs). For RS485 communication (SDT10KL&15KW: 2pcs; DT: 2pcs).
• [3] 6-Pin terminal (Optional): For RS485 communication (SDT4~10KW: 1pcs), For DRED (SDT4~10KW: 1pcs; SDT10KL&15KW: 1pcs; DT: 1pcs).
• Inverter unit
• Wall-Mounted Bracket
• AC Terminal
• AC Cover
• Screw
• PE Terminal
• Expansion Bolts
• WiFi Module (Optional)
• Quick Installation Instruction
• WiFi Configuration Instruction

4.1 Mounting Instructions

Diagram Description: Visuals show a sun, rain, and snow symbol with 'Keep away' or 'Keep dry' labels, indicating environmental considerations for installation.

• In order to achieve optimal performance, the ambient temperature should be lower than 45°C.
• For easy maintenance, it is suggested to install the inverter at eye level.
• Inverters should not be installed near flammable and explosive items. Strong electro-magnetic charges should be kept away from the installation site.
• Product label and warning symbols should be placed at a location that is easy to read by the users.
• Make sure to install the inverter at a place where it is protected from direct sunlight, rain, and snow.

4.2 Equipment Installation

4.2.1 Select The Installation Location

• Take the bearing capacity of the wall into account. The wall (such as concrete walls and metal structures) should be strong enough to hold the weight of the inverter over a long period of time.
• Install the unit where it is accessible for service or electrical connection.
• Make sure the installation location is well ventilated.
• Inverters should not be installed near flammable or explosive items. Any strong electro-magnetic equipment should be kept away from the installation site.
• Install the unit at eye level for convenient operation and maintenance.
• Install the unit vertically or tilted backwards by no more than 15 degrees, with the wiring area facing downwards.

Diagram Description: Shows a maximum tilt angle of 15 degrees backwards. Also shows clearance requirements around the inverter: 200mm upward, 500mm downward, 300mm front, and 500mm on both sides.

4.2.2 Mounting Procedure

Diagram Description: Illustrates the mounting process using a wall-mounted bracket. For both SDT and DT series, it shows drilling holes, fixing the bracket with expansion bolts, and then hanging the inverter onto the bracket. Dimensions for bracket placement are provided.

1. Use the wall-mounted bracket as a template and drill 6 holes on the wall, 10 mm in diameter and 80 mm deep.
2. Fix the wall mounting bracket on the wall with six expansion bolts from the accessory bag.
3. Hold the inverter by the groove on it.
4. Place the inverter on the wall-mounted bracket.

4.3 Electrical Connection

4.3.1 Connection To Grid (AC Side Connection)

1. Measure the voltage and frequency of the grid-connected access point and ensure it complies with the inverter's grid-connected standard.
2. It is recommended to add a breaker or fuse to the AC side. The specification should be more than 1.25 times the rated AC output current.
3. The PE line of the inverter must be connected to the earth, ensuring the impedance between the neutral wire and earth wire is less than 10 ohms.
4. Disconnect the breaker or fuse between the inverter and the utility.
5. Connect the inverter to the grid as follows:
6. Fix the connector of the AC cable to the corresponding terminals with a torque of 6~8 N.m.
7. Neutral conductor shall be blue, line conductor shall be black or brown (preferred), and the protective earth bonding line shall be yellow-green.
8. The AC line construction shall be such that if the cord slips from its anchorage, placing a strain on conductors, the protective earthing conductor will be the last to take the strain (e.g., the PE line is longer than L and N).

Diagram Description: Shows how to prepare the AC cable, including stripping wire insulation (10-12mm) and exposing the conductor (40-45mm). It illustrates the connection terminals L1, L2, L3, N, PE and the process of inserting the wire and fastening the screw cap.

Cable specification of AC side:

Value of Conductor Material Sectional Area refer to the following table:

4.3.3 Earth Terminal Connection

The inverter is equipped with an earth terminal according to the requirement of EN 50178. All non-current carrying exposed metal parts of the equipment and other enclosures in the PV power system must be grounded. Please follow the steps below to connect the "PE" cable to ground.

1. Strip the wire insulation sheet of a suitable length with a wire stripper.
2. Insert the stripped wire into the terminal and compress it tightly by crimping pliers.
3. Fix the earth wire on the machine.

Diagram Description: Shows the preparation of the earth wire, including stripping insulation and crimping. It also shows the components: A - Cold-pressed terminal, B - Screw (M5*14, 1~1.5Nm), C - Green & Yellow Cable (4mm²/10AWG).

In order to improve the corrosion resistance of the terminal, it is recommended to apply silica gel on the earth terminal for corrosion protection after the grounding cable assembly is completed.

4.3.3 AC Circuit Breaker And Residual Current Protection Device

In order to ensure that the inverter can safely and reliably disconnect from the power grid, please install an independent circuit breaker to protect the inverter.

Note: Multiple inverters are not allowed to share a circuit breaker. Leakage current protector is not allowed to connect between the inverter and the circuit breaker.

The integrated leakage current detection device of the inverter can detect external leakage current in real time. When the detected leakage current exceeds the limit value, the inverter will quickly disconnect with the grid. If the leakage current protection device is installed externally, the action current should be 300mA or higher.

4.3.4 DC Side Connection

1. Make sure the DC switch is turned off before connecting the PV string to the inverter.
2. Make sure the PV string polarity conforms with the DC connector. Otherwise, it will cause damage to the inverter.
3. Make sure the maximum open circuit voltage (Voc) of each PV string does not exceed the maximum input voltage of the inverter under any condition.
4. Do not connect the positive or negative pole of the PV string to earth (PE terminal). Otherwise, it will permanently destroy the inverter.
5. Positive cable should be red, negative cable should be black.
6. The minimum insulation resistance to ground of the PV panels must exceed 33.3kΩ (R = 1000/30 mA); there is a risk of shock hazard if the requirement of minimum resistance is not met.

There are four types of DC connectors: DEVALAN, MC4, AMPHENOL H4, and QC4.10 series.

DC Cable specification:

Installation instruction of DC connector:

Diagram Description: Shows positive and negative connectors for different series (MC4 & QC4.10, DEVALAN & AMPHENOL). It also shows a warning not to crimp wire into the limit buckle and to use special tools for crimping.

4.4 Communication Connection

4.4.1 RS485 Communication

This function only applies to inverters with RS485 ports. The RS485 port of the inverter is used to connect the EzLogger Pro, and the total length of the connecting cable should not exceed 1000m. Communication lines must be separated from other power lines to prevent interference. RS485 connection is shown below.

Diagram Description: Shows a network diagram connecting multiple inverters via RS485 to an EzLogger Pro, which then connects to a router and PC. It also details the connection steps: removing a plate, passing the cable through a seal ring, connecting to a 4-pin terminal (1-RS485+, 2-RS485-, 3-Reserved, 4-Reserved, 5-RS485+, 6-RS485-), and reattaching the plate.

Note: The requirement of RS485 communication cable: standard RS485 cable. 3. The choice of 120 ohm termination resistor dip switch (DT series only).

RS485 Connection Details:

• If there is a single DT series inverter, the RS485 connection cable with a waterproof terminal can realize the connection. Use one of the two terminals and cover the unused port with a waterproof cover.
• The 120 ohms termination resistor is controlled by a dip switch. "ON" means connected, and "OFF" means disconnected.
• For single inverter communication, set the dip switch near the terminal to "ON" (default is OFF). The shielding layer of the communication cable should be single-point grounded.
• If there are several PV inverters, their connection can be realized by RS485 communication cables in a daisy chain connection.
• For the last inverter in the daisy chain, set the dip switch near the terminal to "ON" (default is OFF). The shielding layer of the communication cable should be single-point grounded.

Diagram Description: Shows the 120 Ohm Termination Resistor Dip Switch and various RS485 communication methods, including single inverter, multiple inverters daisy-chained with EzLogger Pro, and connection to a Smart Meter.

If several DT inverters are linked together with Ezlogger Pro, the inverter number in the daisy chain could be 20 at most.

4.4.2 Wi-Fi Communication

The Wi-Fi Communication function is only applicable for Wi-Fi Modules. For detailed configuration instructions, refer to the "Wi-Fi Configuration Instruction" in the accessory box. After configuration, please browse the monitoring portal website to create a PV station.

Diagram Description: Shows installation of the WiFi module for DT series and SDT 4-10KW, SDT 10KL/12-15KW, and SDT 17-20KW series inverters, illustrating how to connect the cable terminal with the external WiFi module.

4.4.4 Export Power Limit Connection Diagram

Diagram Description: Shows the connection method for a Power Limiting device, involving a Power Meter connected to the inverter's CT A, CT B, CT C terminals, and also connected to the Grid and House Grid. USB and Reset ports are also visible.

4.4.5 DRED / Remote Shutdown / Smart Meter (Power Limiting Device) Connection

DRED (Demand Response Enabling Device) is only for Australian and New Zealand installations, in compliance with Australian and New Zealand safety requirements. DRED is not provided by the manufacturer.

Remote shutdown is only for Europe installations, in compliance with European safety requirements. Remote shutdown device is not provided by the manufacturer.

Diagram Description: Shows connection steps for DRED, Remote Shutdown, and Smart Meter. It involves removing a plate, connecting cables to specific terminals (e.g., DRM1/5, DRM2/6, DRM3/7, DRM4/8, REFGEN, COM/DRM0 for DRED; DRM4/8, REFGEN for remote shutdown; RS485+ and RS485- for Smart Meter), and reattaching the plate.

1. Meter is a non-standard accessory, please contact the sales manager if needed. 2. Supported DRM commands: DRM0, DRM5, DRM6, DRM7, DRM8. 3. Please refer to the meter instruction guide. 4. DRED connection is only available for Australia and New Zealand. 5. Meter is required for the implementation of export power limiting function. After installation, you need to enable "Power Limit" function and set the export power limiting value on the LCD via buttons according to "4.2 User Interface And System Operation".

4.4.6 Earth Fault Alarm

In compliance with section 13.9 of IEC62109-2, the DT/SDT series inverter is equipped with an earth fault alarm. When an earth fault occurs, the fault indicator on the front LED screen will light up. On inverters with Wi-Fi communication, the system sends an email with the fault notification to the customer. For inverters without Wi-Fi, the buzzer of the inverter will keep ringing for one minute and ring again after half an hour until the fault is resolved. (This function is only available in Australia and New Zealand).

4.4.7 SEMS Portal

SEMS Portal is an online monitoring system. After completing the communication connection installation, you can access www.semsportal.com or download the App by scanning the QR code to monitor your PV plant and device.

Please contact after-sales for more operation details of SEMS Portal.

5.1 LCD Panel

Indicator Lights

Diagram Description: Shows indicator lights for DT series and SDT series, with colors Yellow/Green/Red corresponding to Power/Run/Fault status.

5.2 User Interface And System Configuration

5.2.1 Set safety country

If the display shows "Configure Safety", long press the button to enter the second level menu. Short press to browse the safety country list available. Choose a suitable safety country according to the installation location. The inverter will store the chosen safety country after 20 seconds if no further operation is performed.

Diagram Description: Shows the sequence: "Configure Safety" -> Long Press Enter -> "Set Safety ..." -> Down/Up to select -> Long Press Enter -> "Set Safety Successful".

5.2.2 LCD

Diagram Description: The LCD display area is divided into several areas. Area 1 indicates the flow of power generated (Sun -> Modules -> Inverter -> Grid). Area 2 displays status information like power generation status, language settings, error logs, historical power information. Area 3 shows histogram data. Area 4 displays total power generation (E-TOTAL), daily power generation (E-DAY), real-time power generation (POWER), and system time (TIME).

Display Area Breakdown:

• Area 1 (Flow of Power Generated): Indicates the flow of energy. A full line (--) between inverter and grid means the grid is available but the inverter is not yet feeding power. Flashing dashed lines (---) mean the inverter is feeding power to the grid. No line means the grid is not available. Flashing dashed lines between the sun, modules, and inverter mean there is energy from the PV to modules and then from modules to the inverter.
• Area 2 (Status Information): Displays inverter power generation status. Different statuses like languages & time settings, error logs, historical power information, etc., can be switched and displayed through button operations. This area has 3 levels of menus.
• Area 3 (Histogram Display): Uses a histogram to demonstrate average power generation at each hour from 4:00 AM to 8:00 PM on a day. It can display information in different modes: real-time, hour, day, month, year.
• Area 4 (Total Power, Daily Power, Real-time Power, Time): Displays total power generation, daily power generation, real-time power generation, and system time information.

Area Descriptions:

Diagram Description: Shows detailed menu navigation flows for First Level Menu, Second Level Menu, and Third Level Menu, covering options like Error Log, Data&Time, Language, Histogram, WiFi Reset/Reload, Set Addr, Shadow, LVRT, PF Adjust, Power Limit, and Rated Set. It illustrates button presses (Up, Down, Enter, ESC) and their effects.

*For SDT series, there is no "Shadow OFF" / "LVRT OFF" option.

5.2.4 Menu Introduction

The buttons near the LCD screen are used for inverter information display, setting time, language selection, and histogram information display.

The menu has three levels. In the first level, interfaces display inverter status, model, PV voltage/current, grid voltage/current, and line frequency. Pressing "Enter" locks the current interface for parameter checking (backlight on for 1 min). Pressing "Enter" again unlocks it (backlight on for 30s, then returns to default).

The last interface (Error Log, Date&Time, Language, Histogram) can be entered via the seventh interface in the first level menu by pressing "Enter".

In the second level menu, use "Down" and "Up" to move the cursor. For menus with a third level, press "Enter" to enter and use "Down" and "Up" to change figures. Pressing "Enter" moves the cursor.

In all menu levels, if no action is taken for 30 seconds, the system automatically returns to the first item of the first level menu, and modified data is saved.

Specific Menu Operations:

• Set Safety Country: Long press "Enter" in the "Configure Safety" interface to enter the "Set Safety" menu. Use "Down" or "Up" to choose the safety standard, then long press "Enter" to confirm. If no exact country code is available, choose "50Hz Grid Default" or "60Hz Grid Default".
• Set Time: In the "Date&Time" second level menu, use "Up"/"Down" to select "Date&Time", press "Enter" to enter the time setting interface. Use "Up"/"Down" to change numbers and "Enter" to move the cursor. Long press "Enter" to save.
• Language Setting: In the "Language" second level menu, press "Enter" to enter the language setting interface. LCD will flash. Use "Up" or "Down" to change the language, long press "Enter" to save.
• Histogram: In the "Histogram" second level menu, press "Enter" to enter the third level menu to view historical power generation data (Year, Month, Day, Hour modes). Press "Enter" to show data, "Esc" to return.
• Communication (WiFi/GPRS): For WiFi models, select "WiFi Reset" or "WiFi Reload" and long press "Enter" to reset or reload the WiFi module. For GPRS models, it shows "RSSI: XXX %".
• Set Addr (Modbus): Select "Set Addr" and press "Enter" to enter the Modbus address interface. Use "Up"/"Down" to set the address and long press "Enter" to save.
• Shadow Mode (DT Series only): In the second level menu, select "Shadow OFF", long press "Enter" to turn it "Shadow ON".
• 70% Rated: In the second level menu, select "70% Rated". Long press "Enter" to switch to "100% Rated" (output limited to 70%). This function is for specific standards (VDE AR-N 4105) or regions (France) and is for service personnel only.

Operation Of LCD When Commissioning:

When input voltage reaches the turn-on voltage, LCD displays "Waiting". If the grid is accessible, "Checking xxx Sec" appears (time varies by country standard). After self-checking, the display shows "Normal" and the instant power output.

5.3 Wi-Fi Reset & Wi-Fi Reload

These functions are only available for Wi-Fi model inverters.

Wi-Fi Reset: Select "WiFi Reset" and press "Enter". Long press "Enter" to reset the inverter's WiFi module. This is useful when the inverter cannot connect to the router or monitor server.

Wi-Fi Reload: Select "WiFi Reload" and press "Enter". Long press "Enter" to reload the inverter's WiFi model to its initial settings. This is useful when the inverter cannot connect to the WiFi module. After reloading, the WiFi module needs to be reset again.

Diagram Description: Shows the menu flow for WiFi Reset and Reload, including "WiFi Resetting", "WiFi Reset Successful", "WiFi Reset Failed", and similar statuses for Reload.

5.4 Power Limiting Function Setting

The ON/OFF of the power limiting function (default is OFF) and the power limiting settings (default is 2% rated) are shown below.

Diagram Description: Shows menu options like "Shadow OFF", "LVRT OFF", "PV Adjust", "Power Limit". It illustrates setting the limit from "Limit OFF 100% Rated" to "Limit ON 100% Rated" or "Limit ON 90% Rated".

Note: If the power limiting function is ON, the maximum output power of the inverter will be limited at the power limiting setting value, even without a power limiting device (such as a CT/Meter) or if the device is out of work.

5.5 Error Message

An error message will be displayed on the LCD if a fault occurs.

5.6 Precaution For Initial Startup

1. Make sure the AC circuit is connected and the AC breaker is turned off.
2. Make sure the DC cable between the inverter and PV string is connected, and the PV voltage is normal.
3. Turn on the DC switch, and set safety according to the local regulation.
4. Turn on the AC breaker. Check if the inverter works normally.

5.7 Special Adjustable Setpoints

The inverter has field-adjustable functions, such as trip points, trip times, reconnect times, active and invalid of QU curve, PU curve. These are adjustable through special software. If you want to use these functions, please contact after-sales support. The instruction manual for using the software can be downloaded from the official website or by contacting after-sales.

7.1 Technical Parameters

DT Series (GW4000-DT to GW25K-DT)

[1] For CEI 0-21 Nominal Output Power GW4000-DT is 3605, GW5000-DT is 4550, GW6000-DT is 5450, GW8000-DT is 7250, GW9000-DT is 8150, GW10KN-DT is 9050.

DT Series (GW4000L-DT to GW25K-DT)

DT/SDT Series (GW12KLV-DT, GW15KLV-DT)

Zerf: 1. SDT4~10KW/SDT4KL~10KL: RA = 0.24; XA = j 0.15 at 50Hz; RN = 0.16; XN = j 0.10 at 50 Hz. 2. DT15KW~25KW/SDT15KW/DT12KLV&15KLV RA = 0.15; XA = j 0.15 at 50Hz; RN = 0.10; XN = j 0.10 at 50 Hz.

Note on Definitions:

Overvoltage Category Definition:

• Category I: Applies to equipment connected to a circuit where measures have been taken to reduce transient overvoltage to a low level.
• Category II: Applies to equipment not permanently connected to the installation (e.g., appliances, portable tools, other plug-connected equipment).
• Category III: Applies to fixed downstream equipment, including the main distribution board (e.g., switchgear, other equipment in an industrial installation).
• Category IV: Applies to equipment permanently connected at the origin of an installation (upstream of the main distribution board) (e.g., electricity meters, primary overcurrent protection equipment, directly connected to outdoor open lines).

Moisture Location Category Definition:

Environment Category Definition:

• Outdoor: Ambient air temperature -20~50°C. Relative humidity 4% to 100%, applied to PD3.
• Indoor unconditioned: Ambient air temperature -20~50°C. Relative humidity 5% to 95%, applied to PD3.
• Indoor conditioned: Ambient air temperature 0~40°C. Relative humidity 5% to 85%, applied to PD2.

Pollution Degree Definition:

• Pollution degree 1: No pollution or only dry, non-conductive pollution occurs. The pollution has no influence.
• Pollution degree 2: Normally only non-conductive pollution occurs. However, a temporary conductivity occasionally caused by condensation must be expected.
• Pollution degree 3: Conductive pollution occurs. Or dry, non-conductive pollution becomes conductive due to condensation, which is expected.
• Pollution degree 4: Persistent conductive pollution occurs (e.g., pollution caused by conductive dust, rain, and snow).

7.2 Block Diagram

SDT4~10KW main circuit:

Diagram Description: Shows the main circuit block diagram for SDT4~10KW inverters. Components include PV1+, PV1-, PV2+, PV2- inputs, DC Switch, DC EMI Filter, MPPT1 Circuit, MPPT2 Circuit, 3-level Inverter Circuit, LC Filter, AC EMI Filter, and AC Isolation Relay connecting to L1, L2, L3, N, PE.

SDT10KL / SDT15KW main circuit:

Diagram Description: Shows the main circuit block diagram for SDT10KL/SDT15KW inverters. Components include PV1+, PV1-, PV2+, PV2- inputs, DC Switch, DC EMI Filter, MPPT1 Circuit, MPPT2 Circuit, 3-level Inverter Circuit, LC Filter, AC EMI Filter, and AC Isolation Relay connecting to L1, L2, L3, N, PE.

GW12KLV-DT / GW17K-DT / GW20K-DT main circuit:

Diagram Description: Shows the main circuit block diagram for GW12KLV-DT, GW17K-DT, and GW20K-DT inverters. Components include PV1+, PV1-, PV2+, PV2- inputs, DC Switch, DC SPD, DC EMI Filter, MPPT1 Circuit, MPPT2 Circuit, 3-level Inverter Circuit, LC Filter, AC EMI Filter, and AC Isolation Relay connecting to L1, L2, L3, N, PE.

GW15KLV-DT / GW25K-DT main circuit:

Diagram Description: Shows the main circuit block diagram for GW15KLV-DT and GW25K-DT inverters. Components include PV1+, PV1-, PV2+, PV2- inputs, DC Switch, DC SPD, DC EMI Filter, MPPT1 Circuit, MPPT2 Circuit, 3-level Inverter Circuit, LC Filter, AC EMI Filter, and AC Isolation Relay connecting to L1, L2, L3, N, PE.

8.1 Clearing The Fan

DT series inverters are equipped with three fans on the left side. The fan intakes and handle covers should be cleaned yearly with a vacuum cleaner. For more thorough cleaning, completely remove the fans.

1. Disconnect the AC breaker first and then disconnect the DC breaker.
2. Wait 5 minutes until the residual voltage has been released and the fans are no longer running.
3. Disassemble the fans (Refer to the figure below). Loosen the five screws with a crosshead screwdriver, then remove the fans out of the cabinet about 50mm slowly. Open the lockers of the three fans connectors and remove them from the housing, then take the fans away.
4. Clean the ventilation grid and the fan with a soft brush, paint brush, or compressed air.
5. Reassemble the fans into the cabinet.
6. Please use a towel to clean the heat-sink once a year.

Diagram Description: Shows the DT Series inverter with fans on the side, and a separate diagram for SDT17KW/20KW, indicating fan locations and removal steps.

8.2 Checking The DC Switch

The DC switch does not require any maintenance. Though unnecessary, maintenance as below is still recommended:

• Check the DC switch regularly.
• Activate the DC switch 10 times in a row once a year. Operating the switch will clean it and extend its life.

Boot order:

1. Turn on the breaker on the AC side.
2. Turn on the DC switch.
3. Turn on the breaker on the DC side.

Note: If there's no switch, only perform step 1 and step 3 (skip step 2).

Shutdown order:

1. Turn off the breaker on the AC side.
2. Turn off the DC switch.
3. Turn off the breaker on the DC side.

Note: If there's no switch, only perform step 1 and step 3 (skip step 2).

8.3 Checking The Electrical Connection

1. Check if the AC or DC wire is loose.
2. Check if the earth wire is reliably grounded.
3. Check if the waterproof covers of RS485 and USB ports are fastened.

Note: Maintenance cycle is once every half a year.