REFU REFUsol 48K-UL User manual

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Installation and Operating Manual
REFUsol 48K-UL
English
REFU Elektronik GmbH
843 / 844 Series (with and without AFCI)
REFU Elektronik GmbH No. 982018, Version 1.0 2017-03
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2 REFUsol 48K-UL REFU Elektronik GmbH
Copyright
This manual and the information included therein are the property of REFU Elektronik GmbH.
No part of this manual is to be reproduced or copied without the express written permission of REFU
Elektronik GmbH. Any unauthorized use of this manual is strictly forbidden. Copyright © 2017 REFU
Elektronik GmbH. All rights reserved.
Disclaimer and Limitation of Liability
The information contained in this manual is subject to change by REFU Elektronik GmbH without prior
notice. REFU Elektronik GmbH makes no warranty of any kind whatsoever, either expressed or implied, with
respect to the information contained herein. REFU Elektronik GmbH shall not be liable in damages, of
whatever kind, as a result of the reliance on or use of the information contained herein.
Product Usage Statement
WARNING
Read this entire manual and all other publications pertaining to the work to be
performed before you install, operate, or maintain this equipment. Practice all plant
and product safety instructions and precautions. Failure to follow instructions can
cause personal injury and/or property damage. If the equipment is used in a manner
not specified by the manufacturer, the protection provided by the equipment may be
impaired. All personnel who work with or who are exposed to this equipment must
take precautions to protect themselves against serious or possibly fatal bodily
injury.
REFU Elektronik GmbH provides information on its products and associated
hazards, but it assumes no responsibility for the after-sale operation of the
equipment or the safety practices of the owner or user.
NEVER DEFEAT INTERLOCKS OR GROUNDS.
Trademarks
REFUsol is a registered trademark of REFU Elektronik GmbH.
All other trademarks or registered trademarks are the property of their respective owners.
Feedback from Customers
The technical editor of REFU Elektronik GmbH has carefully developed this handbook on the basis of
research-based document design principles. Suggestions for improvements are always welcome. Please
send your comments regarding the content, structure or format of these operating instructions to:
[email protected].

REFU Elektronik GmbH REFUsol 48K-UL 3
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Table of Contents
1About these Operating Instructions 6
1.1 Symbols and Markup............................................................................................................................... 6
1.2 Warning Notices....................................................................................................................................... 7
1.2.1 Categories of Warning Notices ........................................................................................................... 7
1.2.2 Information........................................................................................................................................... 7
2Safety Information 8
2.1 Intended Use ............................................................................................................................................ 8
2.2 Safety Guidelines ..................................................................................................................................... 8
2.2.1 Rules for Safe Installation and Operation.......................................................................................... 8
2.3 Personal Safety........................................................................................................................................ 8
2.3.1 Suitable Personal Protective Equipment ........................................................................................... 8
2.3.2 Medical and First Aid Treatment ........................................................................................................ 9
2.3.3 Safety Equipment Requirements........................................................................................................ 9
2.3.4 Electrical Safety................................................................................................................................... 9
2.3.5 Wiring Requirements......................................................................................................................... 10
2.3.6 Grounding Requirements.................................................................................................................. 11
2.3.7 Heat Hazard ....................................................................................................................................... 11
2.3.8 Lockout and Tagout Requirements .................................................................................................. 12
2.4 Acronyms and Frequently Used Terms................................................................................................ 12
2.5 Interpreting Product Labels.................................................................................................................. 13
2.6 Product Compliance .............................................................................................................................. 14
2.6.1 Safety and EMC Directives and Standards....................................................................................... 14
3Description of Device 15
3.1 Operating Mode...................................................................................................................................... 15
3.2 Features of REFUsol 48K-UL................................................................................................................ 16
3.3 External Dimensions ............................................................................................................................. 17
3.4 Block Diagram ....................................................................................................................................... 17
3.5 System Block Diagram.......................................................................................................................... 18
3.6 Control Panel ......................................................................................................................................... 18
3.7 Internal Data Logger.............................................................................................................................. 19
4Installation 20
4.1 Assembly Site Requirements................................................................................................................ 20
4.2 Transport................................................................................................................................................ 21
4.3 Storage................................................................................................................................................... 21
4.4 Check Delivery ....................................................................................................................................... 22
4.5 Unpacking the Device ............................................................................................................................ 22
4.6 Installation ............................................................................................................................................. 24
4.7 Device Connectors................................................................................................................................. 26
4.8 Grounding............................................................................................................................................... 27

4 REFUsol 48K-UL REFU Elektronik GmbH
4.9 Residual Current Protection................................................................................................................. 27
4.10 DC and AC Wiring Feedthrough ............................................................................................................ 28
4.11 Grid Line Impedance.............................................................................................................................. 28
4.12 DC Connection of the Solar Generator ................................................................................................. 29
4.13 DC and AC Terminal Connections......................................................................................................... 31
4.14 Interface Port RS485 ............................................................................................................................. 33
4.15 Ethernet Interface Connection.............................................................................................................. 34
5Commissioning 35
5.1 Switching on the Device at Initial Start-up........................................................................................... 35
5.2 Switching on the Device after Replacement ........................................................................................ 36
5.3 Disconnecting Device Power................................................................................................................. 37
5.4 Setting the Country Code and the Menu Language ............................................................................. 37
5.4.1 Set Country Code/Grid Guideline...................................................................................................... 38
5.4.2 Accepting the Country Code.............................................................................................................. 38
5.5 Device Start............................................................................................................................................ 39
5.6 Control Panel ......................................................................................................................................... 40
5.7 Graphical Display................................................................................................................................... 40
5.8 Energy Yield Data Display...................................................................................................................... 41
5.9 Standardized Energy Yield Data Display............................................................................................... 41
5.9.1 Input of Standardized Data................................................................................................................ 42
5.10 Menu Structure...................................................................................................................................... 43
6Configuration 44
6.1 Changing the Menu Language .............................................................................................................. 44
6.2 Limitation of the Power Output............................................................................................................. 44
6.3 Monitoring with REFUlog ...................................................................................................................... 45
6.4 REFUset PC Configuration Tool......................................................................................................... 45
6.5 Communication via Ethernet................................................................................................................. 46
6.5.1 Automatic Setting via DHCP.............................................................................................................. 46
6.5.2 Manual Setting................................................................................................................................... 46
6.6 Communication via RS485..................................................................................................................... 47
6.7 Portal Monitoring................................................................................................................................... 48
6.8 Sending Config....................................................................................................................................... 48
6.9 Portal Test Function .............................................................................................................................. 48
7Operating the Arc Fault Detection Unit (ADU) 49
7.1 General Description............................................................................................................................... 49
7.2 Normal Operation of the Arc Fault Detection Unit .............................................................................. 49
7.2.1 To Operate the ADU in Normal Conditions....................................................................................... 49
7.3 Responding To An Arc Fault.................................................................................................................. 49
7.3.1 To Resolve an Arc Fault..................................................................................................................... 50
8Troubleshooting 51
8.1 Self-Test Error Message.................................................................................................................... 51
8.2 Transient Failure ................................................................................................................................... 51

REFU Elektronik GmbH REFUsol 48K-UL 5
8.3 Faults...................................................................................................................................................... 51
8.4 Fault Acknowledgement........................................................................................................................ 51
8.5List of Error Messages .......................................................................................................................... 51
9Options 57
9.1 Irradiation and Temperature Sensor.................................................................................................... 57
9.1.1 Inverter Sensor Interface.................................................................................................................. 57
9.1.2 Sensor Type Si-13TC-T-K Cable....................................................................................................... 57
9.1.3 Assembling of the Sensor Plug......................................................................................................... 58
9.1.4 Connection of the Sensor at the Solar Inverter ............................................................................... 58
9.1.5 Configuration ..................................................................................................................................... 59
9.2 External Turn Off Signal........................................................................................................................ 60
9.2.1 Overview............................................................................................................................................. 60
9.2.2 Function.............................................................................................................................................. 60
9.2.3 Configurations.................................................................................................................................... 61
9.2.4 Configuration ..................................................................................................................................... 62
10 Maintenance 63
10.1 Maintain the Inverter............................................................................................................................. 63
11 Decommissioning 64
11.1 Remove Inverter..................................................................................................................................... 65
11.2 Package Inverter.................................................................................................................................... 65
11.3 Disposal.................................................................................................................................................. 65
12 Technical data 66
12.1 Inverter................................................................................................................................................... 66
12.2 Sensor..................................................................................................................................................... 68
12.3 Efficiency Measurement REFUsol 48K-UL (843P048.000) .................................................................. 69
12.3.1 Efficiency Graph............................................................................................................................. 69
12.3.2 Efficiency Curves ........................................................................................................................... 69
12.4 Efficiency Measurement REFUsol 48K-UL (844P048.000) .................................................................. 70
12.4.1 Efficiency Graph............................................................................................................................. 70
12.4.2 Efficiency Curves ........................................................................................................................... 70
12.5 Temperature Derating Curve................................................................................................................ 71
13 Contact 72
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6 REFUsol 48K-UL REFU Elektronik GmbH
1About these Operating Instructions
These operating instructions form part of the product.
Important Safety Instructions
Read the operating instructions carefully before installing and using the product.
Save these operating instructions. This manual contains important instructions for the REFUsol solar
inverter that shall be followed during installation and maintenance of this unit.
Keep the operating instructions readily available with the device for the entire service life of the
product.
Provide all future users of the device access to the operating instructions.
Additional information on device options and troubleshooting is available at www.refu-sol.com.
1.1 Symbols and Markup

Prerequisite

One-step instruction
1.
Multiple-step instruction

Bulleted list
Highlighting
Highlighting within a text

Result

REFU Elektronik GmbH REFUsol 48K-UL 7
1.2 Warning Notices
1.2.1 Categories of Warning Notices
This symbol represent important notes concerning potential harm to people, this
unit, or associated equipment. This manual includes this symbol in Danger,
Warning, and Caution boxes to identify specific levels of hazard seriousness.
DANGER
DANGER indicates an imminently hazardous situation that, if not avoided, will
result in death or serious injury. DANGER is limited to the most extreme
situations.
WARNING
WARNING indicates a potentially hazardous situation that, if not avoided, could
result in death or serious injury.
CAUTION
CAUTION indicates a potentially hazardous situation that, if not avoided, could
result in minor or moderate injury.
NOTICE
NOTICE is used for property-damage-only accidents.
1.2.2 Information
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Note:
A notice describes information, which is important for the optimum and
cost-effective operation of the equipment.

8 REFUsol 48K-UL REFU Elektronik GmbH
2Safety Information
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2.1 Intended Use
The REFUsol 48K-UL inverter, also referred to in these operating instructions as the inverter, is a solar
inverter, which transforms the direct current generated by the PV generator (photovoltaic modules) into
alternating current and feeds this to the public power supply network.
The inverter is manufactured according to the rules and current state of technology and takes into account
the valid EU, IEC and UL guidelines respectively.
The inverter fulfils the requirements according to protection class IP 65 / NEMA 4 and can be used indoors
and outdoors.
Any other use is not considered to be a designated use. The manufacturer accepts no liability for damages
resulting from this.
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2.2 Safety Guidelines
Commissioning and operation of this unit must be carried out by qualified personnel. Qualified personnel
includes licensed electricians, service personnel, and authorized operators who have read and fully
understood all of the technical information and the safety instructions contained in this manual.
Review the following information before attempting to install and operate the product.
2.2.1 Rules for Safe Installation and Operation
Please note the following rules:
Do not attempt to install or operate this equipment without proper training.
Ensure that this unit is properly grounded.
Ensure that all cables are properly connected.
Verify that input line voltage and current capacity are within specifications before turning on the
power supplies.
Use proper electrostatic discharge (ESD) precautions.
Always be careful around this equipment.
Never remove the upper inverter lid.
Safe operation requires correct transport, storage, assembly, installation, and operation.
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2.3 Personal Safety
2.3.1 Suitable Personal Protective Equipment
Whenever possible, interaction with this unit should be performed under de-energized conditions.
If interaction with this unit is necessary while it is energized, always ensure that any personnel entering a
safety zone wear appropriate Personal Protective Equipment (PPE) for the specific job to be performed.
Identification of appropriate PPE is the responsibility of the PV system operator and shall be determined in
accordance with NFPA 70E and/or local jurisdictional requirements.

REFU Elektronik GmbH REFUsol 48K-UL 9
2.3.2 Medical and First Aid Treatment
Personnel working in and around operating power generation equipment should be trained in arc flash
hazard, fire extinguisher selection and use, first aid, cardiopulmonary resuscitation (CPR), and automated
external defibrillator (AED) use when each is applicable.
2.3.3 Safety Equipment Requirements
Authorized service personnel performing operations on this unit should have the following minimum safety
equipment available:
Consult NFPA 70E, or applicable local standards, for PPE requirements on switch gear operating
Electrical hazard footwear (ANSI Z41/Z85 rated)
Lockout Tagout (LOTO) Kit
Appropriate meter to verify the circuits are safely de-energized (1000 VAC and DC rated, minimum)
Any other equipment as applicable to your operation as required by national, state, and local
regulations
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2.3.4 Electrical Safety
DANGER
Risk of electrical shock. High voltages are present in the inverter cabinet.
Put DC disconnect into OFF position when working on the unit.
To completely deenergize the DC input conductors, if necessary invoke an
additional equipment disconnecting means, or remove the fuses from an
external combiner box.
Wait 15 minutes to discharge high voltage before working of the inverter.
Put AC disconnect into OFF position.
DANGER
Risk of electrical shock
All electrical installations should be accomplished in accordance with
applicable national or local standards.
DANGER
Risk of electrical shock
Before connecting the inverter to the electrical utility grid, your utility
company must grant approval. Only qualified electricians should make the
connection to the utility grid.

10 REFUsol 48K-UL REFU Elektronik GmbH
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2.3.5 Wiring Requirements
Inverters must be installed by qualified individuals and in accordance with all appropriate regulations, local
building, and electric codes. Consult NEC 690 (USA), CEC Section 50 and 64 (Canada), for additional
information.
You must meet the AC overcurrent protection requirements according to the following table when wiring the
inverters:
Power Level
Breaker Size
48 kW
80 A
Important
Maximum AC overcurrent protection for all models is 80 A.
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Wiring Information
Important
You must use National Electrical Code (ANSI/NFPA 70) wiring methods.
All wiring methods and materials shall be in accordance with the National Electrical Code
ANSI/NFPA 70, as well as all state and local code requirements.
Installations in Canada should be in accordance with the Canadian Electrical Code (CEC) or
applicable local standards.
When sizing conductors and conduits for connection to the inverters, both shall be in accordance
with the National Electrical Code ANSI/NFPA 70, as well as state and local code requirements.
The AC and DC power connections in the inverter should be securely fastened.
AC overcurrent protection for the utility interconnect (grid-tied) must be provided by the installers as
part of the inverter installation.
Use only conductors with a minimum insulation rating of 90 °C (194 °F).
This equipment is intended to be installed as part of a permanently grounded electrical system per
the NEC or local standards.
Wiring Connections
The inverter is connected to the utility grid at the AC terminals. The inverter is configured for 480 VAC, three-
phase output with separate neutral.
Important:
Electromagnetic radiation of the unit is equal to standard household
equipment.
No special precautions are required for people with pacemakers, metallic
implants, or hearing aids.