SMA SUNNY CENTRAL 500CP XT User manual

SCCPXT-E7-WA-en-37 | 98-107200.05 | Version 3.7ENGLISH
Maintenance Manual
SUNNY CENTRAL 500CPXT/ 630CPXT/
720CPXT/ 760CPXT/ 800CPXT/ 850CPXT/
900CPXT/ 1000CPXT

Legal Provisions SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-372
Legal Provisions
The information contained in these documents is the property of SMA Solar Technology AG. No part of this document
may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, be it electronic,
mechanical, photographic, magnetic or otherwise, without the prior written permission of SMA Solar Technology AG.
Internal reproduction used solely for the purpose of product evaluation or other proper use is allowed and does not
require prior approval.
SMA Solar Technology AG makes no representations or warranties, express or implied, with respect to this
documentation or any of the equipment and/or software it may describe, including (with no limitation) any implied
warranties of utility, merchantability, or fitness for any particular purpose. All such representations or warranties are
expressly disclaimed. Neither SMA Solar Technology AG nor its distributors or dealers shall be liable for any indirect,
incidental, or consequential damages under any circumstances.
The exclusion of implied warranties may not apply in all cases under some statutes, and thus the above exclusion may
not apply.
Specifications are subject to change without notice. Every attempt has been made to make this document complete,
accurate and up-to-date. Readers are cautioned, however, that product improvements and field usage experience may
cause SMA Solar Technology AG to make changes to these specifications without advance notice or per contract
provisions. SMA Solar Technology AG shall not be responsible for any damages, including indirect, incidental or
consequential damages, caused by reliance on the material presented, including, but not limited to, omissions,
typographical errors, arithmetical errors or listing errors in the content material.
SMA Warranty
You can download the current warranty conditions from the Internet at www.SMA-Solar.com.
Trademarks
All trademarks are recognized, even if not explicitly identified as such. Missing designations do not mean that a
product or brand is not a registered trademark.
SMA Solar Technology AG
Sonnenallee 1
34266 Niestetal
Germany
Tel. [phone]
Fax [phone]
www.SMA.de
Email: [email protected]
As of: 6/18/2020
Copyright © 2020 SMA Solar Technology AG. All rights reserved.

Table of Contents
SMA Solar Technology AG
Maintenance Manual 3SCCPXT-E7-WA-en-37
Table of Contents
1 Information on this Document..................................................................................................... 6
1.1 Validity ............................................................................................................................................................. 6
1.2 Target Group ................................................................................................................................................... 6
1.3 Levels of Warning Messages.......................................................................................................................... 6
1.4 Symbols in the Document................................................................................................................................ 7
1.5 Typographical Elements in the Document...................................................................................................... 7
1.6 Designations in the Document ........................................................................................................................ 7
1.7 Additional Information..................................................................................................................................... 7
2 Safety ............................................................................................................................................ 9
2.1 Intended Use.................................................................................................................................................... 9
2.2 Safety Information ........................................................................................................................................... 10
2.3 Cyber Security ................................................................................................................................................. 13
2.4 Personal Protective Equipment........................................................................................................................ 13
3 Product Overview ........................................................................................................................ 14
3.1 Design of the Inverter ...................................................................................................................................... 14
3.2 Devices of the Inverter..................................................................................................................................... 14
3.3 Operating and Display Elements.................................................................................................................... 15
3.3.1 Function of the Switches .................................................................................................................................. 15
3.3.1.1 Key Switch....................................................................................................................................................... 15
3.3.1.2 AC Disconnection Unit.................................................................................................................................... 16
3.3.1.3 DC Switchgear................................................................................................................................................ 16
3.3.2 Touch Display................................................................................................................................................... 17
3.3.2.1 Design.............................................................................................................................................................. 17
3.3.2.2 Explanation of Symbols.................................................................................................................................. 17
3.3.3 LEDs of the SC-COM ....................................................................................................................................... 21
3.3.3.1 LEDs on the Enclosure..................................................................................................................................... 21
3.3.3.2 LEDs on the Network Port............................................................................................................................... 22
3.3.3.3 LEDs on the Optical Fiber Terminals.............................................................................................................. 23
3.3.4 User Interface................................................................................................................................................... 24
3.3.4.1 Design of the User Interface........................................................................................................................... 24
3.3.4.2 Tree View and Device View ........................................................................................................................... 24
3.3.4.3 Status Symbols ................................................................................................................................................ 25
3.4 Symbols on the Product................................................................................................................................... 25
4 Disconnecting and Reconnecting ................................................................................................ 26
4.1 Safety When Disconnecting and Reconnecting Voltage Sources................................................................ 26
4.2 Disconnecting the Inverter............................................................................................................................... 26
4.2.1 Switching off the Inverter ................................................................................................................................. 26
4.2.2 Disconnecting the DC Side.............................................................................................................................. 26
4.2.3 Disconnecting the AC Side.............................................................................................................................. 27
4.2.4 Disconnecting the Supply Voltage at the Inverter from Voltage Sources..................................................... 27
4.3 Reconnecting the Inverter................................................................................................................................ 28
4.3.1 Reconnecting the Supply Voltage at the Inverter........................................................................................... 28
4.3.2 Reconnecting the AC Side............................................................................................................................... 29
4.3.3 Reconnecting the DC Side............................................................................................................................... 29
4.3.4 Restarting the Inverter ...................................................................................................................................... 29
5 Troubleshooting............................................................................................................................ 30
5.1 Safety during Troubleshooting........................................................................................................................ 30

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Maintenance ManualSCCPXT-E7-WA-en-374
5.2 Reading Off Disturbance Messages .............................................................................................................. 30
5.2.1 Reading Off Error Messages via Touch Display............................................................................................ 30
5.2.2 Reading Off Disturbance Messages via the User Interface .......................................................................... 31
5.2.3 Displaying the Event Report............................................................................................................................. 31
5.2.3.1 Enabling Automatic Read-Out of Events........................................................................................................ 31
5.2.3.2 Displaying and Downloading the Event Report............................................................................................ 31
5.3 Acknowledging Disturbance Messages......................................................................................................... 31
5.3.1 Acknowledging Disturbance Messages via the Key Switch ......................................................................... 31
5.3.2 Acknowledging Disturbance Messages via the User Interface..................................................................... 32
5.4 Remedial Action in Case of Disturbances...................................................................................................... 32
5.4.1 Inverter Behavior in Case of Disturbances ..................................................................................................... 32
5.4.2 Content and structure of the error tables........................................................................................................ 34
5.4.3 Error Numbers 01xx to 13xx - Disturbance on the Utility Grid .................................................................... 34
5.4.4 Error Numbers 34xx to 40xx - Disturbance on the PV Array ....................................................................... 35
5.4.5 Error Numbers 6xxx to 9xxx - Disturbance on the Inverter........................................................................... 37
5.4.6 Displaying Disturbance Messages for Active Power Limitation .................................................................... 40
5.4.7 Displaying Disturbance Messages for the Reactive Power Setpoint ............................................................ 41
6 Maintenance................................................................................................................................. 42
6.1 Safety during Maintenance ............................................................................................................................ 42
6.2 Maintenance Schedule and Consumables.................................................................................................... 43
6.2.1 Notes on Maintenance Work ......................................................................................................................... 43
6.2.2 Maintenance Work Every 24 Months............................................................................................................ 43
6.3 Repair Schedule and Spare Parts................................................................................................................... 44
6.3.1 Information on Repair Work............................................................................................................................ 44
6.3.2 Demand-Based Annual Repairs ...................................................................................................................... 45
6.3.3 Repairs every 10 Years ................................................................................................................................... 45
6.3.4 Repairs every 12 Years ................................................................................................................................... 45
6.4 Maintenance Work ......................................................................................................................................... 45
6.4.1 Maintenance work with supply voltage present ............................................................................................ 45
6.4.1.1 Checking the Fans........................................................................................................................................... 45
6.4.1.2 Checking the Heating Elements and Hygrostat ............................................................................................ 46
6.4.1.3 Inverter with Low-Temperature Option: Cleaning the Heating Elements..................................................... 47
6.4.1.4 Inverter with Low-Temperature Option: Checking the Heating Elements .................................................... 48
6.4.1.5 Checking the Function of the UPS.................................................................................................................. 50
6.4.2 Maintenance Work in Disconnected State..................................................................................................... 51
6.4.2.1 Performing the Visual Inspection .................................................................................................................... 51
6.4.2.2 Analyzing the Temperature Indicators........................................................................................................... 51
6.4.2.3 Cleaning the Ventilation Plate........................................................................................................................ 53
6.4.2.4 Cleaning the Air Duct, Ventilation Grids and Air Intake............................................................................... 53
6.4.2.5 Cleaning the Interior ....................................................................................................................................... 55
6.4.2.6 Checking the Seals ......................................................................................................................................... 56
6.4.2.7 Checking the Latches, Door Stops and Hinges............................................................................................. 56
6.4.2.8 Checking the Inverter Surface........................................................................................................................ 57
6.4.2.9 Checking the Fuses/Disconnection Blades ................................................................................................... 58
6.4.2.10 Checking the Bolted Connections of the Power Cabling ............................................................................. 58
6.4.2.11 Checking the Labels........................................................................................................................................ 59
6.5 Repair Work..................................................................................................................................................... 61
6.5.1 Reading off the Replacement Interval Meter.................................................................................................. 61
7 Periodic Actions ............................................................................................................................ 62
7.1 Mounting and Disassembly Work.................................................................................................................. 62
7.1.1 Disassembling and Mounting the Panels........................................................................................................ 62
7.1.2 Disassembling and Mounting the Protective Covers...................................................................................... 63
7.1.3 Disassembling and Mounting the Ventilation Grids....................................................................................... 64

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Maintenance Manual 5SCCPXT-E7-WA-en-37
7.2 Entering the Password via the Touch Display ................................................................................................ 65
7.3 Parameter Overview........................................................................................................................................ 65
7.3.1 Accessing the Parameter Overview................................................................................................................ 65
7.3.2 Saving Parameter Changes............................................................................................................................. 66
7.4 User Interface................................................................................................................................................... 66
7.4.1 Logging Into the User Interface....................................................................................................................... 66
7.4.2 Logging Out of the User Interface .................................................................................................................. 66
8 Appendix ...................................................................................................................................... 67
8.1 Installation Information.................................................................................................................................... 67
8.1.1 Torques ............................................................................................................................................................. 67
8.2 Type Label........................................................................................................................................................ 67
9 Contact .......................................................................................................................................... 68

1 Information on this Document SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-376
1 Information on this Document
1.1 Validity
This document is valid for the following device types:
Device type Production version OCU firmware
version
DSP firmware
version
SC500CP‑10 (SunnyCentral500CPXT) E7 02.00.01.R 02.00.01.R
SC630CP‑10 (SunnyCentral630CPXT)
SC720CP‑10 (SunnyCentral720CPXT)
SC760CP‑10 (SunnyCentral760CPXT)
SC800CP‑10 (SunnyCentral800CPXT)
SC850CP‑10 (SunnyCentral850CPXT)
SC900CP‑10 (SunnyCentral900CPXT)
SC1000CP‑10 (SunnyCentral1000CPXT)
The production version is indicated on the type label.
The firmware version can be read off from the user interface.
Illustrations in this document are reduced to the essential and may deviate from the real product.
1.2 Target Group
The tasks described in this document must only be performed by qualified persons. Qualified persons must have the
following skills:
• Knowledge of how the product works and is operated
• Training in how to deal with the dangers and risks associated with installing, repairing and using electrical devices
and installations
• Training in the installation and commissioning of electrical devices and installations
• Knowledge of all applicable laws, standards and directives
• Knowledge of and compliance with this document and all safety information
1.3 Levels of Warning Messages
The following levels of warning messages may occur when handling the product.
DANGER
Indicates a hazardous situation which, if not avoided, will result in death or serious injury.
WARNING
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
CAUTION
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.

1 Information on this Document
SMA Solar Technology AG
Maintenance Manual 7SCCPXT-E7-WA-en-37
NOTICE
Indicates a situation which, if not avoided, can result in property damage.
1.4 Symbols in the Document
Symbol Explanation
Information that is important for a specific topic or goal, but is not safety-relevant
☐
Indicates a requirement for meeting a specific goal
☑
Desired result
✖
A problem that might occur
Example
1.5 Typographical Elements in the Document
Typography Use Example
bold • Messages
• Terminals
• Elements on a user interface
• Elements to be selected
• Elements to be entered
• Connect the insulated conductors
to the terminals X703:1 to
X703:6.
• Enter 10 in the field Minutes.
>• Connects several elements to be
selected
• Select Settings > Date.
[Button]
[Key]
• Button or key to be selected or pressed • Select [Enter].
# • Placeholder for variable components
(e.g., parameter names)
• Parameter WCtlHz.Hz#
1.6 Designations in the Document
Complete designation Designation in this document
Medium-voltage transformer MV transformer
SunnyCentralCommunicationController SC-COM, communication unit
Sunny Central CP XT SunnyCentral or inverter
1.7 Additional Information
For more information, please go to www.SMA-Solar.com.

1 Information on this Document SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-378
Title and information content Type of information
"Requirements for medium-voltage transformers and transformers for internal
power supply for SUNNYCENTRAL and SUNNYCENTRALSTORAGE"
Technical Information
"PUBLIC CYBER SECURITY - Guidelines for a Secure PV System Communication" Technical information
For information on maintenance activities of the DC switchgear and AC disconnect unit please visit www.abb.com:
Component Document number
DC switchgear, AC disconnection unit: T-Max 1SDH000707R0001
DC switchgear: E-Max 1SDH000460R0003

2 Safety
SMA Solar Technology AG
Maintenance Manual 9SCCPXT-E7-WA-en-37
2 Safety
2.1 Intended Use
The SunnyCentral is a PV inverter which converts the direct current generated in the PV modules into grid-compliant
alternating current. An external MV transformer fitted downstream feeds the generated alternating current into the
utility grid.
The product is suitable for indoor and outdoor use.
The enclosure complies with degree of protection IP54. The inverter is classified under Class4C2 as per
EN60721-3-4 and is suitable for operation in a chemically active environment.
The maximum permissible DC input voltage of the inverter must not be exceeded.
The inverter must only be operated in conjunction with a suitable MV transformer.
• The MV transformer must be designed for voltages that arise during pulsed mode of the inverter.
• For the SunnyCentral 500CPXT/630CPXT/720CPXT/760CPXT/800CPXT the maximum voltage to ground is:
±1450V
• For the SunnyCentral 850CPXT/900CPXT/1000CPXT the maximum voltage to ground is: ±1600V
• Do not connect more than one inverter to one winding of the MVtransformer.
• The neutral conductor on the low-voltage side of the MV transformer must not be grounded.
You can find further information on suitable transformers in the technical information "Requirements for Medium-
Voltage Transformers and Transformers for Internal Power Supply for the SUNNYCENTRAL".
Do not deactivate or modify settings that affect grid management services without first obtaining approval from the grid
operator.
Use this product only in accordance with the information provided in the enclosed documentation and with the locally
applicable standards and directives. Any other application may cause personal injury or property damage.
Alterations to the product, e.g. changes or modifications, are only permitted with the express written permission of
SMA Solar Technology AG. Unauthorized alterations will void guarantee and warranty claims and in most cases
terminate the operating license. SMA Solar Technology AG shall not be held liable for any damage caused by such
changes.
Any use of the product other than that described in the Intended Use section does not qualify as the intended use.
The enclosed documentation is an integral part of this product. Keep the documentation in a convenient place for
future reference and observe all instructions contained therein.
All work on the product must only be performed using appropriate tools and in compliance with the ESD protection
regulations.
Suitable personal protective equipment must be worn by all persons working on or with the product.
Unauthorized persons must not operate the product and must be kept at a safe distance from the product.
The product must not be operated with open covers or doors.
The product must not be opened when it is raining or when humidity exceeds 95%.
The product must not be operated with any technical defects.
The type label must remain permanently attached to the product.

2 Safety SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3710
2.2 Safety Information
This section contains safety information that must be observed at all times when working on or with the product. To
prevent personal injury and property damage and to ensure long-term operation of the product, read this section
carefully and observe all safety information at all times.
DANGER
Danger to life from electric shock due to live voltage
High voltages are present in the live components of the product. Touching live components results in death or
serious injury due to electric shock.
• Wear suitable personal protective equipment for all work on the product.
• Do not touch any live components.
• Observe all warning messages on the product and in the documentation.
• Observe all safety information of the module manufacturer.
• After switching off the inverter, wait at least 15minutes before opening it to allow the capacitors to discharge
completely (see Section4.2, page26).
DANGER
Danger to life due to electric shock when live components or DC cables are touched
When exposed to sunlight, the PV modules generate high DC voltage which is present in the DC cables. Touching
live DC cables results in death or lethal injuries due to electric shock.
• Do not touch non-insulated parts or cables.
DANGER
Danger to life due to electric shock in case of a ground fault
If there is a ground fault, components that are supposedly grounded may in fact be live. Touching live parts will
result in death or serious injury due to electric shock.
DANGER
Danger to life from electric shock due to damaged product
Operating a damaged product can lead to hazardous situations that result in death or serious injuries due to
electric shock.
• Only operate the product when it is in a flawless technical condition and safe to operate.
• Check the product regularly for visible damage.
• Make sure that all external safety equipment is freely accessible at all times.
• Make sure that all safety equipment is in good working order.
• Wear suitable personal protective equipment for all work on the product.

2 Safety
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Maintenance Manual 11SCCPXT-E7-WA-en-37
DANGER
Danger to life from electric shock even if the inverter is disconnected on the AC and DC sides
The precharge unit of the order option "QatNight" will carry live voltage even if the AC contactor and the DC
switchgear are open. Touching live components results in death or serious injury due to electric shock.
• Do not touch any live components.
• Switch off the inverter.
• After switching off the inverter, wait at least 15minutes before opening it to allow the capacitors to discharge
completely.
• Ensure that no voltage is present.
• Do not remove protective covers.
• Observe the warning messages.
• Wear suitable personal protective equipment for all work on the product.
WARNING
Danger to life from electric shock when entering the PV field
Ground-fault monitoring does not provide protection from personal injury. PV modules which are grounded with
ground-fault monitoring discharge voltage to ground. Entering the PV field can result in lethal electric shocks.
• Ensure that the insulation resistance of the PV field exceeds the minimum value. The minimum value of the
insulation resistance is: 1 kΩ.
• Before entering the PV field, switch the PV modules to insulated operation.
• Configure the PV power plant as a closed electrical operating area.
WARNING
Danger to life due to electric arc if there are tools inside the product
When reconnecting or during operation, an electric arc can occur if there are tools in the product creating a
conductive connection between the live components. This can result in death or serious injury.
• Before commissioning or reconnection, verify that no tools are inside the product.
WARNING
Danger to life from electric shock if the product is not locked
If the product is not locked, unauthorized persons will have access to live components carrying lethal voltages.
Touching live components can result in death or serious injury due to electric shock.
• Always close and lock the product.
• Remove the keys.
• Store the keys in a safe place.
• Ensure that no unauthorized persons have access to the closed electrical operating area.

2 Safety SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3712
WARNING
Danger to life due to blocked escape routes
In hazardous situations, blocked escape routes can lead to death or serious injury. Opening the doors of two
products located opposite each other can block the escape route. It is imperative that the escape route is freely
accessible at all times.
• An escape route must be available at all times. Make sure the minimum passage width of the escape route
meets local standards.
• Do not place any objects in the escape route area.
• Remove all tripping hazards from escape routes.
CAUTION
Risk of burns due to hot components
Some components of the product can get very hot during operation. Touching these components can cause burns.
• Observe the warnings on all components.
• During operation, do not touch any components marked with such warnings.
• After switching off the product, wait until any hot components have cooled down sufficiently.
• Wear suitable personal protective equipment for all work on the product.
NOTICE
Property damage due to dust intrusion and moisture penetration
Dust or moisture intrusion can damage the product and impair its functionality.
• Do not open the enclosure during rainfall or when humidity exceeds the specified thresholds. The humidity
thresholds are: 15% to 95%.
• Only perform maintenance work when the environment is dry and free of dust.
• Operation of the product is only permitted when it is closed.
• Connect the external supply voltage after mounting and installing the product.
• If the installation or commissioning process is interrupted, mount all panels.
• Close and lock the enclosure.
• The product must always be closed for storage.
• Store the product in a dry and covered location.
• The temperature at the storage location must be in the specified range. The temperature range is:
−25°Cto+70°C.
NOTICE
Damage to electronic components due to electrostatic discharge
Electrostatic discharge can damage or destroy electronic components.
• Observe the ESD safety regulations when working on the product.
• Wear suitable personal protective equipment for all work on the product.
• Discharge electrostatic charge by touching grounded enclosure parts or other grounded elements. Only then is
it safe to touch electronic components.

2 Safety
SMA Solar Technology AG
Maintenance Manual 13SCCPXT-E7-WA-en-37
2.3 Cyber Security
Most operating activities such as monitoring and control of systems can be done locally by the PV system operator or
service personnel without the need for data communication via public Internet infrastructure. These operating activities,
including data communication between PV system operator/service personnel and data logger, inverter or additional
equipment, can be accessed by using local displays, keypads or using local access of the webserver of a device in the
LAN of the PV system or of the building.
In other use cases of systems, the PV systems are also part of the global communication system, which is based on
Internet infrastructures.
The data communication via Internet is an up-to-date, economically viable and customer-friendly approach in order to
enable easy access for the following modern applications such as:
• Cloud platforms (e.g. SunnyPortal)
• Smartphones or other mobile devices (iOS or Android apps)
• SCADA systems, which are remotely connected
• Utility interfaces for grid management services
Alternatively, selected and secured communication interfaces may be used. These solutions are no longer state of the
art and are very expensive to use (special communication interfaces, separate wide area networks and more).
When using the Internet infrastructure, the systems connected to the Internet are entering a basically unsecure area.
Potential attackers constantly seek vulnerable systems. Usually, they are criminally motivated, have a terrorist
background or aim to disrupt business operations. Without taking any measures to protect systems and other systems
from such misuse, a data communication system should not be connected to the Internet.
You can find the current recommendations by SMA Solar Technology AG on the topic of Cyber Security in the
Technical Information "PUBLIC CYBER SECURITY - Guidelines for a Secure PV System Communication" at www.SMA-
Solar.com.
2.4 Personal Protective Equipment
Always wear suitable protective equipment
When working on the product, always wear the appropriate personal protective equipment for the specific job.
The following personal protective equipment is regarded to be the minimum requirement:
☐ In a dry environment, safety shoes of categoryS3 with perforation-proof soles and steel toe caps
☐ During precipitation or on moist ground, safety boots of categoryS5 with perforation-proof soles and steel toe
caps
☐ Tight-fitting work clothes made of 100%cotton
☐ Suitable work pants
☐ Individually fitted hearing protection
☐ Safety gloves
Any other prescribed protective equipment must also be used.

3 Product Overview SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3714
3 Product Overview
3.1 Design of the Inverter
A
C
B
Figure 1: Design of the Inverter
Position Designation
A Inverter cabinet
B Interface cabinet
C Connection area
3.2 Devices of the Inverter
A
B
D
E
F
C
G
Figure 2: Inverter Components
Position Component Description
A Touch Display Different kinds of inverter data can be viewed on the touch display. The
touch display is only used to view data. The display screen is activated by
touching the touch display.
B Service interface The service interface allows access to the user interface.
C Key switch The key switch is used to switch the inverter on and off.
D DC switchgear The DC switchgear disconnects the inverter from the PV array.

3 Product Overview
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Maintenance Manual 15SCCPXT-E7-WA-en-37
Position Component Description
E SC-COM The SC-COM is the communication unit of the inverter. The SC-COM estab-
lishes the connection between the inverter and the system operator.
F AC disconnection unit With the AC disconnection unit, the electrical connection between the in-
verter and MV transformer can be disconnected manually.
In the event of residual current, the AC disconnection unit disconnects the
connection between the inverter and MV transformer automatically.
G AC contactor The AC contactor disconnects the electrical connection between the in-
verter and MV transformer automatically.
3.3 Operating and Display Elements
3.3.1 Function of the Switches
3.3.1.1 Key Switch
The key switch is used to switch the inverter on and off.
Figure 3: Switch positions of the key switch
Position Designation
ASwitch position Stop
BSwitch position Start
Switch position Start
If the key switch is turned to Start, a motor drive switches the DC switchgear on and the inverter switches from the
operating state "Stop" to the operating state "Grid monitoring". Provided that there is sufficient irradiation and a valid
utility grid connection, the inverter switches to feed-in operation. If there is insufficient irradiation and the input voltage
is therefore too low, the inverter remains in the operating state "Grid monitoring".
Switch position Stop
If the key switch is turned to Stop while the inverter is in the operating state "Grid monitoring", a motor drive switches
the DC switchgear off. The inverter switches to the operating state "Stop". If the key switch is turned to Stop while the
inverter is in the operating state "MPP load operation", the inverter switches to the operating state "Shutdown". Once
shutdown is complete, the AC contactor and the DC switchgear are opened automatically and the inverter switches to
the operating state "Stop".

3 Product Overview SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3716
3.3.1.2 AC Disconnection Unit
The AC disconnection unit disconnects the inverter from the MV transformer.
Figure 4: Switch positions of the AC disconnection unit from ABB
Position Designation Explanation
ASwitch position on The AC disconnection unit is closed.
B Central switch position The AC disconnection unit was tripped and is open.
CSwitch position off The AC disconnection unit is open.
3.3.1.3 DC Switchgear
The DC switchgear disconnects the inverter from the PV power plant.
Figure 5: Indicators on the DC load-break switch
Position Designation
A Spring status indicator
B Position indicator
C ON button
D OFF button

3 Product Overview
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Maintenance Manual 17SCCPXT-E7-WA-en-37
3.3.2 Touch Display
3.3.2.1 Design
The touch display is used to display instantaneous values and parameter settings. Tapping the symbols on the touch
display activates the corresponding functions. If the touch display has not been touched for five minutes, the display is
locked and the logged-in user will be logged out. By tapping the characters "S", "M" or "A", you can unlock the display
again.
The touch display is divided into three areas.
100 DD.MM.YYYY-hh:mm:ss
A
B
C
Figure 6: Design of the touch display
Position Designation Explanation
A Status info line Number of the active menu, login status and time
B Information field Area of the main menu
C Navigation line Navigation area
3.3.2.2 Explanation of Symbols
Information field
You can access the following sub-menus and screens from the information field:
Symbol Designation Explanation
E-today line graph Diagram 103: Representation of energy fed in during the current day in
kWh.
Bar chart Diagram 104: Representation of energy fed in during the last 14days in
kWh.

3 Product Overview SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3718
Symbol Designation Explanation
DC side Representation of the instantaneous values
• PV power in W
• Insulation resistance in Ω
• PV current in A
• PV voltage in V
• Diagram of string-current monitoring
– Diagram 132 to 133: Group currents of the individual Sunny
String‑Monitors
– Diagram 140 to 146: String currents of the individual Sunny
String‑Monitors
String-current monitoring of
the DC side
Representation of the instantaneous values of the string-current monitoring
of the individual Sunny String-Monitors
Switch on DC or AC side
closed
If you see this symbol between the "DC side" symbol and the "Inverter
data" symbol, the DC switchgear is closed.
If you see this symbol between the symbol "Inverter data" and the symbol
"AC side", the AC contactor is closed.
Switch on DC or AC side
open
If you see this symbol between the "DC side" symbol and the "Inverter
data" symbol, the DC switchgear is open.
If you see this symbol between the symbol "Inverter data" and the symbol
"AC side", the AC contactor is open.
Status of switches on DC or
AC side unknown
If you see this symbol between the "DC side" symbol and the "Inverter
data" symbol, the switch status of the DC switchgear is not known.
If you see this symbol between the symbol "Inverter data" and the symbol
"AC side", the switch status of the AC contactor is unknown.
Inverter data Representation of the following inverter data:
• Device type
• Operating state
• Symbol for utility grid menu
• Symbol for temperature display
• Symbol for fan display

3 Product Overview
SMA Solar Technology AG
Maintenance Manual 19SCCPXT-E7-WA-en-37
Symbol Designation Explanation
AC side Representation of the following instantaneous values:
• Active power in W
• Reactive power in VAr
• Power frequency in Hz
• AC current in A
• AC voltage in V
grid First menu page:
• Active mode of active power limitation
• Target active power in kW
• Actual active power in kW
Second menu page
• Active mode of reactive power setpoint
• Target reactive power in VAr
• Target displacement power factor cos φ
• Target excitation type of the displacement power factor
• Actual reactive power in VAr
• Actual displacement power factor cos φ
• Actual excitation type of the displacement power factor
Settings Menu
Symbol Designation Explanation
Language selection Select this symbol to open the language selection menu.
Brightness setting Select this symbol to open the brightness setting menu.
Time setting Select this symbol to open the time setting menu.
Format selection Select this symbol to open the format selection menu.
Password entry Select this symbol to open the password entry menu.
Navigation line
Symbol Designation Explanation
Back Select this symbol to go back to the previous page.
Homepage Select this symbol to go to the homepage.

3 Product Overview SMA Solar Technology AG
Maintenance ManualSCCPXT-E7-WA-en-3720
Symbol Designation Explanation
Settings • Language selection
• Brightness setting
• Time setting
• Format selection
• Password entry
Information • OS: version of the operating system
• App.: version of the application software
• SC-COM version: SC-COM software version
• Ser.No.: inverter serial number
• Hardware: hardware version and serial number of the SC-COM
Error • ErrNo: error number
• TmsRmg: time until reconnection
• Msg: error message
• Dsc: corrective measure
Service • Telephone receiver: Contact Service.
• Tool: Contact your installer.