REFU 801 Series Operating Instructions Manual
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REFU 801 Series Operating Instructions Manual

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Operating Instructions
REFUone 3K-2T ... 7K-2T
Version 4 (No. 982065)
801 Series
June 2019

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  • Page 1 Operating Instructions REFUone 3K-2T ... 7K-2T Version 4 (No. 982065) 801 Series June 2019...
  • Page 2 (including software, etc.), and no reproduction or distribution of it in any form or by any means. All rights reserved. REFU reserves the right of final interpretation. This manual is subject to change according to user’s or customer’s feedback. Please check our website at for latest http://www.refu.com...
  • Page 3 REFUone 3K-2T …7K-2T Preface Outline Please read the product manual carefully before installation, operation or maintenance. This manual contains important safety instructions and installation instructions that must be followed during installation and maintenance of the equipment. Scope This product manual describes the installation, electrical connections, commissioning, maintenance and troubleshooting of REFUone 3K-2T …...

  • Page 4: Table Of Contents

    REFUone 3K-2T, 5K-2T, 7K-2T Table of Contents Basic safety information ................... 5 Safety instructions ..........................5 Symbols and signs ..........................8 Product characteristics ..................9 Product dimensions ......................... 9 Function description ........................12 Efficiency curve ..........................13 Installation ..................... 15 Installation Process ........................

  • Page 5: Basic Safety Information

    For safety reason only a qualified electrician, who has received training and / or has demonstrated skills and knowledge in construction and in operation of this unit, can install this inverter. REFU Elektronik GmbH does not take any responsibility for the property destruction and personal injury because of any incorrect use.
  • Page 6 You can ask solar equipment installation contractor or REFU Elektronik GmbH for help if necessary. Transport of the equipment, especially by road, must be carried out by suitable ways and means for protecting the components (in particular, the electronic components) from violent shocks, humidity, vibration, etc.
  • Page 7 Inverter should work again after removing any faults. If you need any repair work, please contact with the local authorized service center;  Can’t open the internal components of inverter without authorized. REFU Elektronik GmbH does not take any responsibility for the losses from that. Attention 1.1.7...

  • Page 8: Symbols And Signs

    REFUone 3K-2T, 5K-2T, 7K-2T Symbols and signs 1.2.1 Safety symbols Caution of burn injuries due to hot enclosure!  You can only touch the screen and pressing key of the inverter while it’s working. Caution PV array should be grounded in accordance to the requirements of the local electrical grid operator! We suggest that all PV module frames and inverter are reliably grounded to protect the PV system and personnel security.

  • Page 9: Product Characteristics

    REFUone 3K-2T …7K-2T Product characteristics Outlines of this chapter Product dimensions It introduces the field of use, and the overall dimensions of the REFUone inverters. Function description It introduces how REFUone inverters work and the function modules inside. Efficiency curves It introduces the efficiency curves of in the inverter.
  • Page 10 REFUone 3K-2T, 5K-2T, 7K-2T Front view and left view dimensions of REFUone 3K-2T and 5K-2T 324.0 mm 130.0 mm Front view and left view dimensions of REFUone 7K-2T 352.0 mm 157.0 mm...
  • Page 11 REFUone 3K-2T …7K-2T Back view and Bracket dimensions REFUone 3K-2T and 5K-2T 291.0 mm 110.0 mm 110.0 mm 160.0 mm 28.5 mm Back view and Bracket dimensions REFUone 7K-2T 314.0 mm 87.5 mm 87.5 mm 90.0 mm 265.0 mm 177.0 mm 87.5 mm...

  • Page 12: Function Description

    -25°C a +65°C Classe de proteção Classe 1 boxes, equipment, etc.); they must Topologia do inversor Não isolado REFU Elektronik GmbH, Marktstrasse 185 be cleaned regularly and kept www.refu.com 72793 Pfullingen, Alemanha fabricados na República Popular da China visible at all times.

  • Page 13: Efficiency Curve

    REFUone 3K-2T …7K-2T Electrical block diagram Electrical block diagram Efficiency curve Efficiency Curve REFUone 3K-2T 100% Vpv=250V Vpv=365V Vpv=450V 100% % of Rated Output Power...
  • Page 14 REFUone 3K-2T, 5K-2T, 7K-2T Efficiency Curve REFUone 5K-2T Efficiency Curve REFUone 7K-2T 100% Vpv=300V Vpv=365V Vpv=450V 100% % of Rated Output Power...

  • Page 15: Installation

    REFUone 3K-2T …7K-2T Installation Outlines of this chapter This topic describes how to install the REFUone inverters. Installation notes  Do NOT install the REFUone inverter on flammable material.  Do NOT install the REFUone inverter in an area used to store flammable or explosive materials.
  • Page 16 REFUone 3K-2T, 5K-2T, 7K-2T Table 1 shows the components and mechanical parts that should be delivered Pictures Description Quantity Quantity REFUone 3K- REFUone 7K-2T 2T, 5K-2T REFUone inverter 1 pcs 1 pcs Rear panel 1 pcs 1 pcs PV+ input terminal 2 pcs 3 pcs PV-input terminal...

  • Page 17: Tools

    REFUone 3K-2T …7K-2T 485 terminal (2pin) 1 pcs AC connection housing 1 pcs Tools Prepare tools required for installation and electrical connections. Table 2 shows the tools required for installation and electrical connections. Tool Model Function Hammer drill Used to drill holes on the wall Recommend drill dia.

  • Page 18: Determining The Installation Position

    REFUone 3K-2T, 5K-2T, 7K-2T Measuring tape Used to measure distances Level Used to ensure that the rear panel is properly installed 0- 180º ESD gloves Operators wear Safety goggles Operators wear Anti-dust respirator Operators wear Determining the Installation Position Determine an appropriate position for installing the REFUone inverter. Comply with the following requirements when determining the installation position: Installation Requirements...
  • Page 19 REFUone 3K-2T …7K-2T clearance for single REFUone inverter Installation of multiple REFUone inverters...

  • Page 20: Moving The Refuone Inverter

    REFUone 3K-2T, 5K-2T, 7K-2T Moving the REFUone inverter This topic describes how to move the REFUone horizontally to the installation position Step 1 Open the packaging, insert hands into the slots on both sides of the inverter and hold the handles, as shown in Figure 14and Figure 15. Moving the inverter (1) Moving the REFUone inverter (2) Step 2 Lift the REFUone from the packing case and move it to the installation position.
  • Page 21 REFUone 3K-2T …7K-2T Wall mounting 3K-2T, 5K-2T Step 1 Step 2 Step 3 Wall mounting 7K-2T Step 1 Step 2 Step 3 Step 4 Hook the inverter to the rear panel. Using an M5 screw to secure the inverter to the rear panel to ensure safety.

  • Page 22: Electrical Connections

    REFUone 3K-2T, 5K-2T, 7K-2T Electrical Connections Outlines of this chapter This topic describes the REFUone inverter electrical connections. Read this part carefully before connecting cables. NOTE: Before performing electrical connections, ensure that the DC switch is OFF. Since the stored electrical charge remains in a capacitor after the DC switch is turned OFF.
  • Page 23 REFUone 3K-2T …7K-2T Prerequisites: The PGND cables are prepared (≥6mm² outdoor power cables are recommended for grounding purposes), the color of cable should be yellow-green. Procedure: Step 1 Remove the insulation layer with an appropriate length using a wire stripper, as shown in Figure 20.

  • Page 24: Connecting Dc Input Power Cables

    REFUone 3K-2T, 5K-2T, 7K-2T Connecting DC Input Power Cables  The REFUone 3K-2T … 7K-2T has 2 MPP Trackers. The MPPT 1 and MPPT 2 input is marked with PV1 and PV2 respectively at the connectors.  The maximum power for each MPPT is limited (see chapter 8.1 DC Data)! If you want to use the full power of the inverter, both inputs need to be connected.
  • Page 25 REFUone 3K-2T …7K-2T Connecting DC input power cables 1. Positive power cable 2. Negative power cable Note L2 is 2 to 3 mm longer than L1. Step 3 Insert the positive and negative power cables into corresponding cable glands. Step 4 Insert the stripped positive and negative power cables into the positive and negative metal terminals respectively and crimp them using a clamping tool.

  • Page 26: Connecting Ac Output Power Cables

    REFUone 3K-2T, 5K-2T, 7K-2T Follow-up Procedure To remove the positive and negative connectors from the inverter, insert a removal wrench into the bayonet and press the wrench with an appropriate strength, as shown in Figure 27 Before removing the positive and negative connectors, ensure that the DC SWITCH is OFF.
  • Page 27 REFUone 3K-2T …7K-2T Table 4 Recommended AC output cable specifications Model REFUone 3K-2T REFUone 5K-2T REFUone 7K-2T Cable (Copper) ≥ 4mm² ≥ 6mm² ≥ 6mm² Circuit Breaker 20A/230V/2P/0.1A 32A/230V/2P/0.1A 40A/230V/2P/0.1A Multi core copper wire AC cable should be correctly sized to ensure the power loss in AC cable is less than 1% of the rated power.
  • Page 28 REFUone 3K-2T, 5K-2T, 7K-2T A: 30 … 50mm B: 6 … 8mm; Step 2 Disassemble the AC connector according to the figure shown below: insert the AC output cable (with its insulation layer stripped according to step 1) through the waterproof locking cable gland;...
  • Page 29 REFUone 3K-2T …7K-2T Step 4 Step 5 REFUone 7K-2T: AC wire connections procedure: Step 1: As shown in Figure 34to make the output line, the wire ends need to use tube-type terminals. It is recommended to use tube-type terminals KST model: E6012 (10 AWG) A1: recommendation: Tube type terminal KST model: E6012 (10AWG) Step 2: As shown in Figure 35, remove the waterproof cover with the cross screwdriver.

  • Page 30: Connecting Communications Cables

    REFUone 3K-2T, 5K-2T, 7K-2T A2: waterproof plug  Connect the yellow and green cable to the lock hole of AC terminal marked with identification;  Connect the red line to the lock hole of the terminal with L identification AC; connect the black line to the lock hole of the terminal with N identification AC;...
  • Page 31 REFUone 3K-2T …7K-2T Cable Gland REFUone 3K-2T, 5K-2T REFUone 7K-2T Step 2: Unlock the waterproof cable gland, remove the stopper in the waterproof connector Cable Gland A1: Waterproof stopper REFUone 3K-2T, 5K-2T REFUone 7K-2T Note: The waterproof connectors correspond to: I/O, dry contact, RS485 from left to right.
  • Page 32 REFUone 3K-2T, 5K-2T, 7K-2T 6 mm 6 mm REFUone 3K-2T, 5K-2T REFUone 7K-2T Step 4: Choose the terminal according to Table 6, connect the wires as per the labels, and secure the wires using a slotted screwdriver. Note: keep the unused terminals for future use. Table 6 functional description of the communication terminals RS485 DRM0...
  • Page 33 REFUone 3K-2T …7K-2T REFUone 3K-2T, REFUone 5K-2T REFUone 7K-2T If users need to connect multiple inverters via RS485 wires, refer to the figure shown below: RS485 wires are connected in parallel, so 4 wires may be required. First connect the two 485+ (TX+) wires in parallel, then connect the two 485- (TX-) wires in parallel, then insert them into the terminal and tighten the screws using a slotted screwdriver.

  • Page 34: Wifi/Gprs Module Installation Procedure

    REFUone 3K-2T, 5K-2T, 7K-2T WiFi/GPRS module installation procedure Step 1: remove WiFi/GPRS waterproof cover using screw driver Step 2: Assemble logger to the inverter communication interface as shown in the diagram. Step 3: fasten WiFi/GPRS module using screws.

  • Page 35: Wifi Communication

    REFUone 3K-2T …7K-2T WiFi Communication The REFUone grid-connected inverters offer Wi-Fi communication modes as standard. Refer to the figure shown below: Internet Gateway The operation information (generated energy, alert, operation status) of the inverter can be transferred to the REFUlog monitoring portal via WiFi. 4.7.1 Configuration of WiFi Stick with PC Preparation: The WiFi Stick is installed according to section 4.6 and the REFUone Inverter must...

  • Page 36: Monitoring Portal Refulog

    To view the inverter data, open with your browser and login with your www.refu-log.com existing username and password or register as a new user. You can use the activation code provided on the inverter to assign one or more inverter to a PV system in your account.

  • Page 37: Rs485 Communication

    REFUone 3K-2T …7K-2T RS485 Communication 4.9.1 Communication between one inverter and one PC with RS485 Refer to the figure shown below, connect the TX+ and TX- of the inverter to the TX+ and TX- of the RS485 to USB adapter, and connect the USB port of the adapter to the computer. (Note 1) 1: Radio ripple control receiver 2: RS485 to USB Adapter 4.9.2...

  • Page 38: Commissioning Of Inverter

    Please consult qualified electrical engineer or personnel from electrical safety authorities about this. REFU Elektronik GmbH is not responsible for any consequences arising out of incorrect country code selection. If the inverter indicates any fault, please refer to of this manual trouble shooting for help.

  • Page 39: Operation Interface

    REFUone 3K-2T …7K-2T Operation interface Outlines of this chapter This section introduces the display, operation, buttons and LED indicator lights of REFUone Inverter. Operation and Display Panel Buttons and Indicator lights Ground Fault Warning Light Inverter Status Light Warning Light Key buttons Key buttons ...

  • Page 40: Standard Interface

    REFUone 3K-2T, 5K-2T, 7K-2T Standard Interface When power-on, LCD interface displays INITIALIZING, refer below picture. Initializing… When control board successfully connected with communication board, the LCD display the current state of the inverter, display as shown in the figure below. Waiting States, Countdown 10S (depends country code, some are 60s) Wait 10s...

  • Page 41: Main Interface

    REFUone 3K-2T …7K-2T Regular error state Fault Unrecoverable error state Permanent Inverter states includes: wait, check, normal, fault and permanent Wait: Inverter is waiting to Check State at the end of reconnection time. In this state, grid voltage value is between the max and min limits and so on; If not, Inverter will go to Fault State or Permanent State.
  • Page 42 REFUone 3K-2T, 5K-2T, 7K-2T (A) “Enter Setting” Interface as below: 1.Enter Setting 1. Set Time 11. Set Start Parameter 2. Clear Energy 12. Set Safety Voltage 3. Clear Events 13. Set Safety Frequency 4. Set Country 14. Insulation Resistance 5. On-Off Control 15.
  • Page 43 REFUone 3K-2T …7K-2T Table 7 Country code setting Code Country Code Country Code Country Germany VDE AR-N4105 Poland Cyprus CEI0-21 Internal Germany BDEW India Australia Germany VDE 0126 Philippines Spain RD1699 Italy CEI0-16 NewZealand Turkey UK-G83 Brazil Denmark Greece island Slovakia VSD Greece Continent EU EN50438...
  • Page 44 REFUone 3K-2T, 5K-2T, 7K-2T press „OK” button to confirm the value and to next value setting. „Error! Try again” will be displayed for wrong passwords. Press „ESC” button and rekey in the correct passwords then set total energy. „Success” or „fail” is displayed after setting. Set address Users press „ESC”...
  • Page 45 REFUone 3K-2T …7K-2T setting interface. Enter „Set SafetyFreq” by pressing „Up” button Or „Down” button, press „OK” button and enter „Input Password” Setting interface. Press „ESC” button to set passwords (default: 0001), increase or decrease value though pressing „Up” button or „Down” button, press „OK”...
  • Page 46 REFUone 3K-2T, 5K-2T, 7K-2T (default: 0001), increase or decrease value though pressing „Up” button or „Down” button, press „OK” button to next value setting. „Error! Try again” will be displayed for wrong passwords. Press „ESC” button and rekey in the correct passwords. „Success” will be displayed if setting successfully.

  • Page 47: Update Software Online

    REFUone 3K-2T …7K-2T “SystemInfo” Interface as below: 3.SystemInfo 1. Inverter Type 7. Input Mode 2. Serial Number 8. Power Factor 3. SoftVersion 9. Reflux Power 4. HardVersion 10. Safety Paras 5. Country 11. MPPT Scan 6. Modbus Address Display Time Press the „ESC”...
  • Page 48 Step 3 The SD card reader must be ready by the users, so that SD card so easy to establish the connection with the computer. Step 4 REFU will send the Software code to the user who needs to update. After user receive the file, please decompressing file and cover the original file in SD card.
  • Page 49 REFUone 3K-2T …7K-2T Fail”. Step 9 If fail, please turn off the DC breaker, wait for the LCD screen extinguish, then turn on the DC breaker again, then Continue to update from step 6. Step 10 After the update is completed, turn off the DC breaker, wait for the LCD screen extinguish, then recover the communication waterproof and then turn on the DC breaker and AC breaker again, the inverter will enters the running state.

  • Page 50: Trouble Shooting And Maintenance

    REFUone 3K-2T, 5K-2T, 7K-2T Trouble shooting and maintenance Outlines of this chapter This topic describes how to perform daily maintenance and troubleshooting to ensure longterm proper operation of the inverter. Trouble shooting This section contains information and procedures for solving possible problems with the inverter.
  • Page 51 REFUone 3K-2T …7K-2T under-frequency protection points after ID04 GridUFP The power grid Obtaining approval from the local electrical grid frequency is too low operator. ID05 PVUVP The input voltage is too Check whether too few PV modules are series connected in a PV string, thus the voltage (Vmp) of the PV string is lower than the minimum operating voltage of inverter.
  • Page 52 REFUone 3K-2T, 5K-2T, 7K-2T ID21 MChip_Fault The master chip fault ID22 HwAuxPowerFault The auxiliary voltage error ID23 BusVoltZeroFault The bus voltage sampling error ID24 IacRmsUnbalance The Output current is not balanced ID25 BusUVP The bus voltage Is too If the PV array configuration is correct (no ID05 fault), the possible cause is that the solar irradiance is too low.
  • Page 53 REFUone 3K-2T …7K-2T Fault_DCI DSP and slave DSP is not consistent ID52 Consistent The GFCI sampling value Fault_GFCI between the master DSP and slave DSP is not consistent ID53 SpiCommLose The spi communication between the master DSP and slave DSP is fault ID54 SciCommLose...
  • Page 54 REFUone 3K-2T, 5K-2T, 7K-2T ID71 Unrecover Incorrect input mode Check the input mode (parallel mode/ independent PvConfigSet Wrong mode) setting of inverter according to Section 0 (Input Mode) of this user manual, If it’s incorrect, change it according to Section 0. Set Input mode of this manual.

  • Page 55: Maintenance

    REFUone 3K-2T …7K-2T Maintenance Inverters generally do not need any daily or routine maintenance. The heat sink should not be blocked by dust, dirt or any other item. Before the cleaning, make sure that the DC SWITCH is turned OFF and the circuit breaker between inverter and electrical grid is turned OFF.

  • Page 56: Technical Data

    REFUone 3K-2T, 5K-2T, 7K-2T Technical data Outlines of this chapter This topic lists the technical specifications for all REFUone inverters. DC Data Technical Data 3K-2T 5K-2T 7K-2T Max. input power (W) 3,500 5,500 8,300 Number of independent MPPT Number of DC inputs MPPT 1 / 2 1 / 1 1 / 1 2 / 1...

  • Page 57: General Data

    REFUone 3K-2T …7K-2T Protection class Class I External environment pollution degree Degree 3 Overvoltage category PV: OVC II, AC mains: OVC III Max inverter Back-feed current to the array (A) Output short circuit current and duration 200 A / 1 µs Output inrush current and duration 0.8 A / 2 µs General Data...

  • Page 58: Quality Assurance

    In case of faults falling within manufacturers’ responsibility, REFU Elektronik GmbH will provide service and maintenance free of any charge. Disclaimer  Use of REFU inverters for any other purpose than its intended for; Faulty system design or installation;  Improper operation;...

  • Page 59: Technical Support

    REFUone 3K-2T …7K-2T Technical Support If you have followed the Trouble shooting and could not solve your issue, you can contact REFU’s service team as follows: Brazil: +55 (11) 4235-9377 Germany +49 (7121) 4332-333 Webpage: www.refu.com/refuone Download of Data sheets, Manuals, Certificates, Firmware Update Files etc.
  • Page 60 REFU Elektronik GmbH Marktstraße 185 D-72793 Pfullingen Phone: +49 (0)7121-4332 0 Fax: +49 (0)7121-4332 140 Mail: info@refu.com Version 4 (No. 982065) 801 Series June 2019...

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