Sunways AT 2700 User manual

User Manual for
Sunways Solar Inverter
AT 5000, AT 4500, AT 3600, AT 2700

1 Operating field with LCD display, oper-
ating LED and keyboard
2 DC connections
3 DC load break switch
4 Rating plate
5 AC connection
6 Communication interfaces
350
585
205
+–
+–
1
2
23 4 5
6
1
87 9 13121110
6

3
This user manual contains explanations
on using the Sunways Solar Inverter. You
will learn to recognise the many possibili-
ties of the solar inverter. Information is
provided on safety, installation, com-
missioning, operation and system
monitoring.
Please observe the safety precautions
exactly to ensure increased safety at the
operating site of the solar inverter.
Introduction
Thank you for deciding in favour of a
Sunways Solar Inverter of the AT Series!
In doing so you have purchased an inno-
vative, high-quality product with unique
equipment features and a high, constant
efficiency. This solar inverter is equipped
with HERIC®topology and innovative FP
switching, and therefore enables opera-
tion on a large number of silicon and
thin-film modules – as accustomed from
Sunways – without the use of a trans-
former.

4
Imprint
All rights reserved.
© Copyright by:
Sunways AG
Photovoltaic Technology
Macairestraße 3 - 5
78467 Konstanz
Germany
This user manual may only be reprinted or copied in whole
or in part with the express, written approval of Sunways
AG. Any type of reproduction, distribution or storage on
data carriers in any form and of any kind not authorised
by Sunways AG represents a violation of the applicable
copyright laws and will be prosecuted. We reserve the right
to make technical changes which serve to improve the
unit, or which increase the safety standard – even without
separate prior notice.
Publisher responsible for the content: Sunways AG
This user manual contains products and product names
which are registered trademarks. The mention of products
and product names is used only for information purposes
and does not represent
product misuse. The passage referring to these products in
this user manual does not represent original documenta-
tion of the respective product.

5
Content
Introduction 3
1.0 Product Description 8
1.1 Proper use 9
1.2 Function description 9
Block diagram 11
1.3 Integration in solar system 12
Design of solar generator 12
Standard components of a solar
system 13
1.4 Assembly description 14
1.5 Delivery scope 15
2.0 Safety precautions 16
2.1 General safety precautions 17
2.2 Explanation of symbols and
warnings 18
Warnings and symbols in user
manual 18
Symbols 19
2.3 Basic safety measures 20
2.4 Safety concept 20
3.0 Installation 22
3.1 Mechanical installation 23
Requirements for installation
location 23
Installation 25
3.2 Electrical installation 26
Solar generator connection 26
Grid connection 33
3.3 Installing communication 39
Interface overview 39
Networking solar inverters via
CAN bus 40
Networking solar inverters via
RS485 interface 41
S0 interface 42
Connection of temperature and
irradiation sensor 43
Connecting alarm relay 44
4.0 Commissioning 46
4.1 Connecting and disconnecting
solar inverter 47
Connecting 47
Switching off 48

6
4.2 Commissioning 49
Commissioning single unit 50
Commissioning several
networked units 52
Later commissioning 55
5.0 Operation 56
5.1 Operating elements 57
Operating field 57
LCD display 57
Operating LED 58
Standard screen (single unit) 59
Standard screen (system) 60
5.2 Access rights 61
5.3 Menu structure 62
Instantaneous Values – Unit 63
5.4 Overview of screen displays 63
Events – Unit 64
History – Unit 65
Information – Unit 66
Instantaneous values – Solar
system 67
Yields – Solar system 67
Events – Solar system 68
History – Solar system 68
System info – Solar system 69
Settings – General 70
Settings – Login 71
Settings – Network 72
5.4 Malfunction displays 73
6.0 System monitoring 96
6.1 General information 97
6.2 Integrated data logger 98
6.3 Direct Ethernet connection 99
6.4 Network settings on solar
inverter 100
6.5 Network settings on PC 101
6.6 Connection via an existing
Ethernet network 105
6.7 Connection via Internet 107
6.8 Connection via Sunways
Modem 108
6.9 Dialling in from a PC to solar
inverter 109
6.10 Sunways Browser 114
General information 114
Access protection 115
Overview – Menu 116
Language selection 116

7
Setting date/time 117
Software update 118
Distributing software update
to networked units 119
6.11 Internet dial-in via modem 120
Modem settings 120
Email settings 122
6.12 Active alerting 124
General information 124
Alerting settings 125
6.13 Sunways portal connection 126
General information 126
Setup 127
7.0 Appendix 130
7.1 Technical data 131
7.4 General liability disclaimer 139

8
1.0 Product Description

9
1.1 Proper use
The Sunways AT Solar Inverter is the link
between your solar generator and the
public power grid. The energy from the
connected solar generator is converted to
grid-conformant AC current and fed into
the grid.
Thanks to the HERIC®topology with FP
switching, the AT Solar Inverter has a
voltage curve which corresponds to that
of a transformer unit with an earthed
negative terminal, and is generally also
recognized for operation on thin-film
modules.
Solar modules which require earthing of
the positive terminal cannot be operated
with the AT Solar Inverter. If in doubt,
always ask your module manufacturer
about a release!
1.2 Function description
Conversion from direct into alternating
current
The AT Solar Inverter converts the direct
current produced by the solar generator
into alternating current. The alternating
current is then fed into the public power
grid.
Operating and display elements
Various interfaces are available for sys-
tem configuration and monitoring:
· Operating field (LCD display and key-
board) for displaying operating and
status values or for inputting system
parameters
· Operating LED
· Integrated web server for display and
configuration via a web browser
Interfaces
· Bus interface for connecting an
analogue modem, ISDN modem or
GSM/GPRS modem
· Ethernet interface for connecting a PC
or for integration in existing networks

10
· CAN bus interface for interconnecting
several solar inverters
· S0 pulse output for controlling large
displays
· Alarm relay for realising simple moni-
toring locally
· Interface for connecting an irradiation
and temperature sensor
Data logging
The AT Solar Inverter is equipped with
internal data logging for recording and
saving system data:
· 5-minute mean values of voltages,
currents, output, temperature and ir-
radiation (if sensor is installed)
· 5-minute, daily, monthly and annual
values of energy yield
· Memory for malfunction messages
Grid monitoring
The AT Solar Inverter assumes the task
of grid monitoring for the protection of
the unit and persons. In case of abnormal
grid conditions, feeding is immediately
interrupted and the solar inverter discon-
nects from the grid by triggering the grid
relay.
Design of solar inverter
The principle design of the AT Solar In-
verters can be recognised from the block
diagram. The most important character-
istic of the inverter is the earthing of the
solar generator, i.e. the negative terminal
is directly connected to the neutral con-
ductor on the grid.
The solar generator voltage connected to
the inverter input is always positive and is
initially adapted by the DC actuator and
then converted to alternating current by
the high-efficiency HERIC®inverter. The
AC connection is made with 5 wires for a
3-phase feed point (3-phase AC current
connection) due to the 3-phase passive
grid monitoring, whereby feeding is
only single-phase. A 3-wire connection
is made at the single-phase feed point
(alternating current connection).

11
Block diagram
=
=
=
~
L1
L2
L3
PE
N
L1 L2 L3 PE N
–
+DC+
DC–
Control and monitoring
DC actuator HERIC® inverter
Solar generator
Grid

12
1.3 Integration in solar system
Design of solar generator
The technical data of the selected solar
generator must be within the solar
inverter‘s specifications (see Technical
Data). Incorrect dimensioning can lead to
reductions in the yield and to destruction
of the unit.
The Sunways design program Sundim
may be helpful to you. Sunways Sundim
is available on the included CD-ROM or
at our homepage www.sunways.de.
Be sure to take the following points into
account before planning your system:
· Watch the celestial alignment of the
modules. A maximum yield is achieved
in Central Europe with a module slope
of 30° to the vertical and direction of
the solar generator field directly to the
south.
· The output of the cells decreases as
the module temperature increases.
Install your solar generator with suf-
ficient ventilation from behind.
· Check your solar generator approx.
every three years for soiling. This oc-
curs especially on the lower edge of
the modules and forms a veil that can-
not be washed off even by heavy rain.
Reduced yield can be prevented by
cleaning with a wet cloth or a brush.
· Avoid switching off individual modules
or solar cells of your system. This can
lead to major decreases in yield.

13
Standard components of a solar system
Depending on the recommendations of
your PV planning expert, your PV system
consists of the following components:
1 Solar generator
2 Solar inverter with integrated DC load
break switch
3 Mains fuse and energy meter
Options
4 Irradiation sensor with integrated
temperature sensor
5 PC for monitoring system
6 Large display
Standard components
1
4
5
2
3
6
DC
AC

14
1 Operating field with LCD display,
operating LED and keyboard
2 DC connections
3 DC load break switch
4 Rating plate
5 AC connection
6 Communication interfaces
350
585
205
+–
+–
1
2
23 4 5
6
1
87 9 13121110
6
1.4 Assembly description

15
1.5 Delivery scope
The delivery consists of:
· Sunways Solar Inverter of the AT-Series
· Installation frame
· 2 pairs of Tyco Solarlok plug-in connec-
tors
· AC connector
· CAN terminating resistor connector
(connected)
· Ethernet cable, 2 m (CAT 5e, 1:1)
· Manual
· Warranty card
· CD-ROM, including: Sunways Sundim
design program, product and service
information
Checking delivery
Before shipment our products are
checked for proper condition. Despite
careful, recyclable packing, transport
damage may occur, for which the trans-
port company is generally responsible.
Please check the delivered solar inverter
thoroughly!
Should you discover damage to the pack-
ing or the solar inverter, please inform
the transport company immediately. Your
specialist dealer will be happy to sup-
port you if necessary. A possible damage
report must always be received by the
transport company in writing at the la-
test seven days after receipt of the goods.

16
2.0 Safety precautions

17
2.1 General safety precautions
Observe information in operating
manual!
The condition for the safe handling and
malfunction-free operation of the AT
Solar Inverter is a knowledge of the basic
safety precautions.
This user manual contains the most
important information on operating the
system safely.
Each person concerned with the instal-
lation, commissioning, maintenance and
operation of the solar inverter must have
read and understood the entire user
manual, and in particular the chapter
entitled Safety Precautions.
In addition, the rules and regulations for
accident prevention applicable for the
operating site/plant must be observed.
Dangers when handling the AT Solar
Inverter
The solar inverter has been built in ac-
cordance with the latest rules of techno-
logy and the recognized safety rules and
may only be used
· for its intended use
· when in proper condition with regard
to safety.
Improper use may lead to dangers to the
life and limb of the user or others, or
can adversely affect the system or other
property.
In case of malfunctions which can impair
safety, the system must be shut down
immediately and secured against being
switched on again. The malfunction must
then be eliminated immediately.

18
Warranty and liability
The „General Terms and Conditions of
Sale and Delivery“ of Sunways AG always
apply. Warranty and liability claims for
injuries and damage shall not be accept-
ed if they are due to one or more of the
following causes:
· Improper use of the solar inverter
· Improper installation, commissioning,
operation and maintenance
· Operation of the solar inverter with
defective and/or non-operational
safety and protective equipment
· Failure to observe the information in
the user manual regarding installa-
tion, commissioning, operation and
maintenance
· Unauthorised constructional
modifications
· Insufficient monitoring of wearing
parts
· Improperly conducted repairs
· Catastrophes resulting from the effects
of foreign bodies and acts of God.
2.2 Explanation of symbols and
warnings
To help you quickly understand this
manual and safely use the solar inverter,
the following warnings and symbols are
used.
Warnings and symbols in user manual
!
DANGER
This symbol indicates an immediate
danger which will result in death, injury
or serious damage if the applicable safety
regulations are not followed.
!
CAUTION
This symbol indicates an immediate
danger which can result in damage if
the applicable safety regulations are not
followed.

19
Symbols
Information
This symbol indicates important informa-
tion which contributes to a better under-
standing of the solar inverter.
Warnings and symbols on unit
The following warnings on the housing
of the solar inverter point out dangers.
Always observe the warnings exactly!
This symbol indicates that the user man-
ual must be read and understood before
putting the unit into operation.
IMPORTANT
Hot surface! The housing can heat up
during operation.
The unit must be disconnected for the
mains supply and from the PV generator
before opening the housing. The unit
still carries life-threatening voltage for
approx. five minutes internally and at the
connection sockets of the PV generator
following disconnection from the PV gen-
erator. The energy storage capacitors are
not completely discharged until after this
time. You must wait at least five minutes
after disconnecting the unit from the
mains supply and from the PV generator
before opening the unit.
Warning!
High leakage current,
earth connection essential before
connecting supply.
WARNING!
High leakage currents. Be sure to make
an earthing connection before connect-
ing the power supply circuit (AC system)!

20
2.3 Basic safety measures
Electrical work on the solar inverter must
be conducted by a qualified electrician
while observing the VDE regulations,
national and other regulations!
The solar inverter may only be opened
by persons authorised by Sunways AG to
do so!
When circuit breakers are tripped, the
fault cause must be determined and
eliminated before returning the unit to
operation.
Check electrical equipment regularly!
Retighten loose connections!
Replace damaged lines/cables
immediately!
2.4 Safety concept
The following parameters are monitored
and displayed continuously and simulta-
neously by the inverter controller:
· DC overvoltage
· Overvoltage L1 > 10%
· Overvoltage L1 > 15%
· Undervoltage L1
· Overvoltage L2
· Undervoltage L2
· Overvoltage L3
· Undervoltage L3
· Isolated operation
· Overfrequency L1
· Underfrequency L1
· Surge error (brief overvoltage L1)
· DC share in AC current
· AFI residual current jump > 30 mA
· AFI residual current > 300 mA
· Overtemperature of heat sink