REFU 801 Series User manual

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

REFUone 3K-2T, 5K-2T, 7K-2T
2
Notice
This manual contains important safety instructions that must be followed during installation
and maintenance of the equipment.
Save these instructions!
This manual must be considered as an integral part of the equipment, and must be available
at all times to everyone who interacts with the equipment. The manual must always
accompany the equipment, even when it is transferred to another user or field.
Copyright Declaration
The copyright of this manual belongs to REFU Elektronik GmbH. Any corporation or individual
should not plagiarize, partially copy or fully copy it (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 http://www.refu.com for latest
version.
REFU Elektronik GmbH
Marktstraße 185
D-72793 Pfullingen
Tel.: [phone]
Fax: [phone]
Mail: [email protected]

REFUone 3K-2T …7K-2T
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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 …7K-2T inverters.
Keep this manual where it will be accessible at all times.
Target Group
This manual is intended for qualified electrical technical personnel who are responsible for
inverter installation and commissioning in the PV power system and the PV plant operator.
Symbols Used
This manual provides safety operation information and uses the symbol in order to ensure
personal and property security and use the inverter efficiently when operating the inverter.
You must understand these emphasized information to avoid the personal injury and property
loss. Please read the following symbols used in this manual carefully.
Danger indicates a hazardous situation which, if not avoided, will result in death or
serious injury.
Danger
Warning indicates a hazardous situation which, if not avoided, could result in death or
serious injury.
Warning
Caution indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
Caution
Attention indicated potential risks which, if not avoided, may lead to equipment fault
or property damage.
Attention
Note provides tips that are valuable for the optimal operation of the product.
Note

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Table of Contents
1Basic safety information ................................................................................... 5
1.1 Safety instructions............................................................................................................................5
1.2 Symbols and signs ............................................................................................................................8
2Product characteristics...................................................................................... 9
2.1 Product dimensions .........................................................................................................................9
2.2 Function description ......................................................................................................................12
2.3 Efficiency curve ..............................................................................................................................13
3Installation ..................................................................................................... 15
3.1 Installation Process ........................................................................................................................15
3.2 Checking Before Installation ..........................................................................................................15
3.3 Tools ...............................................................................................................................................17
3.4 Determining the Installation Position............................................................................................18
3.5 Moving the REFUone inverter ........................................................................................................20
3.6 Installing REFUone inverter............................................................................................................20
4Electrical Connections..................................................................................... 22
4.1 Electrical connection......................................................................................................................22
4.2 Connecting PGND Cables ...............................................................................................................22
4.3 Connecting DC Input Power Cables ...............................................................................................24
4.4 Connecting AC Output Power Cables.............................................................................................26
4.5 Connecting Communications Cables..............................................................................................30
4.6 WiFi/GPRS module installation procedure ............................................................................34
4.7 WiFi Communication......................................................................................................................35
4.8 Monitoring Portal REFUlog ............................................................................................................36
4.9 RS485 Communication...................................................................................................................37
5Commissioning of inverter .............................................................................. 38
5.1 Safety inspection before commissioning.......................................................................................38
5.2 Start Inverter ..................................................................................................................................38
6Operation interface ........................................................................................ 39
6.1 Operation and Display Panel..........................................................................................................39
6.2 Standard Interface..........................................................................................................................40
6.3 Main Interface................................................................................................................................41
6.4 Update Software online .................................................................................................................47
7Trouble shooting and maintenance ................................................................. 50
7.1 Trouble shooting.............................................................................................................................50
7.2 Maintenance ..................................................................................................................................55
8Technical data ................................................................................................. 56
8.1 DC Data...........................................................................................................................................56
8.2 AC Data...........................................................................................................................................56
8.3 Efficiency, Protection and Communication ...................................................................................56
8.4 General Data ..................................................................................................................................57
9Quality Assurance ........................................................................................... 58
10 Technical Support ........................................................................................... 59

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1 Basic safety information
If you have any question or problem when you read the following information,
please contact REFU Elektronik GmbH.
Note
Outlines of this chapter
Safety instruction
It mainly introduce the safety instruction when install and operate the equipment.
Symbols and signs
It mainly introduce the safety symbols on the inverter.
1.1 Safety instructions
Read and understand the instructions of this manual, and be familiar with relevant safety
symbols in this chapter, then start to install and troubleshoot the equipment.
According to the national and state requirements, before connecting to the electrical grid, you
must get permission from the local electrical grid operator, and the operation can only be
performed by qualified electrical engineer.
Please contact the nearest authorized service center if any maintenance or repair is needed.
Contact your distributor for the information of the nearest authorized service center. Do NOT
repair it by yourself, it may cause injury or property damage.
Before installing and maintaining the equipment, you should turn the DC switch OFF to cut off
the high voltage DC of the PV array. You can also turn the switch in the PV combiner box OFF to
cut off the high voltage DC. Otherwise, serious injury may be caused.
1.1.1 Qualified persons
The customer must make sure the operator has the necessary skill and training to do his/her
job. Staff in charge of using and maintaining the equipment must be skilled, aware and mature
for the described tasks and must have the reliability to correctly interpret what is described in
the manual. 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.
1.1.2 Installation requirements
Please install inverter according to the following section. Fix the inverter on an appropriate
objects with enough load bearing capacity (such as walls, PV racks etc.), and ensure that
inverter is vertical placed. Choose a place suitable for installing electrical devices. Assure there
is enough fire exit space, convenient for maintenance. Maintain proper ventilation to ensure
enough air cycle to cool the inverter.

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REFUone 3K-2T / 5K-2T REFUone 7K-2T
1.1.3 Transport requirements
If you find packing problems that may cause the damage of the inverter, or find any visible
damage, please immediately notice the responsible transportation company. 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.
1.1.4 Electric connection
Please comply with all the current electrical regulations about accident prevention in dealing
with the solar inverter.
Before the electrical connection, make sure to use opaque material to cover
the PV modules or to disconnect PV array DC switch. Exposure to the sun,
PV array will produce a dangerous voltage!
Danger
All installation accomplished only by professional electrical engineer!
must be trained;
Completely read the manual operation and understand relevant
matters.
Warning
Get permission from the local electrical gird operator, complete all electrical
connections by professional electrical engineer, then connect inverter to
electrical grid.
Attention
It’s forbidden to remove the tamper evident label, or open the inverter.
Otherwise REFU will not provide warranty or maintenance!
Note

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1.1.5 Operation
Touching the electrical grid or the terminal of the equipment may lead to
electrocution or fire!
Don’t touch the terminal or conductor connected to the electrical grid.
Pay attention to any instructions or safety documents related to grid
connection.
Danger
Some internal components will be very hot when inverter is working.
Please wear protective gloves!
Attention
1.1.6 Maintenance and repair
Before any repair work, turn OFF the AC circuit breaker between the
inverter and electrical grid first, then turn OFF the DC switch.
After turning OFF the AC circuit breaker and DC switch, wait for 5
minutes at least before carrying out any maintenance or repair work.
Danger
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 EMC / noise level of inverter
Electromagnetic compatibility (EMC) refers to that one electrical equipment functions in a
given electromagnetic environment without any trouble or error, and impose no unacceptable
effect upon the environment. Therefore, EMC represents the quality characters of an electrical
equipment.
The inherent noise-immune character: immunity to internal electrical noise.
External noise immunity: immunity to electromagnetic noise of external system
Noise emission level: influence of electromagnetic emission upon environment.
Electromagnetic radiation from inverter may be harmful to health!
Please do not continue to stay around the inverter in less than 20 cm when
inverter is working.
Danger

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1.2 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.
Attention
Ensure input DC voltage < Max. DC voltage .Over voltage may cause
permanent damage to inverter or other losses, which will not be included in
warranty!
Warning
1.2.2 Signs on the inverter
There are some symbols, which are related to security on the inverter. Please read and
understand the content of the symbols, and then start the installation.
There is a residual voltage in the inverter! Before opening the
equipment, operator should wait for five minutes to ensure the
capacitor is discharged completely.
Caution, risk of electric shock.
Caution, hot surface.
Comply with the Conformite Europeenne (CE) certification.
Grounding point.
Please read this manual before install REFUone inverters.
IP65
This indicates the degree of protection of the equipment according to
IEC standard 70-1 (EN 60529 June 1997).
Positive pole and negative pole of the input voltage (DC).

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2 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.
2.1 Product dimensions
2.1.1 Field of use
REFUone inverters are Dual MPPT grid-tied PV inverters which converts the DC power
generated by PV arrays into sine wave single-phase AC power and feeds it to the public
electrical grid, AC circuit breaker (refer to Section 4.4) and DC switch used as disconnect
device, and the disconnect device shall be easily accessible.
PV Grid-tied System
REFUone inverters can only be used with photovoltaic modules that do not require one of the
poles to be grounded. The operating current during normal operation must not exceed the
limits specified in the technical specifications. Only the photovoltaicmodules can be connected
to the input of the inverter (do not connect batteries or other sources of power supply).
The choice of optional parts of inverter should be made by a qualified technician who knows
the installation conditions clearly.
Overall dimensions REFUone 3K-2T and 5K-2T (L×W×H): 437 mm×324 mm×130 mm.
Overall dimensions REFUone 7K-2T (L×W×H): 467 mm×352 mm×157 mm.

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352.0 mm
467.0 mm
157.0 mm
Front view and left view dimensions of REFUone 3K-2T and 5K-2T
Front view and left view dimensions of REFUone 7K-2T
324.0 mm
437.0 mm
130.0 mm
4 6 7 . 0 m m