SMA SSM-U-1615 User Manual
OperatingManual
SMAString-Monitor SSM-U-1615 / SSM-U-2415 / SSMU-3215
SSMUXX15-BE-en-10 | Version 1.0
ENGLISH
Legal Provisions
SMA Solar Technology AG
Legal Provisions
The information contained in these documents is property of SMA Solar Technology AG. Any
publication, whether in whole or in part, requires prior written approval by 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 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. A lack of identification does
not mean that a product or symbol is not trademarked.
The BLUETOOTH® word mark and logos are registered trademarks of BluetoothSIG,Inc. and any
use of these marks by SMASolarTechnologyAG is under license.
Modbus® is a registered trademark of Schneider Electric and is licensed by the Modbus
Organization, Inc.
QR Code is a registered trademark of DENSO WAVE INCORPORATED.
Phillips® and Pozidriv® are registered trademarks of Phillips Screw Company.
Torx® is a registered trademark of Acument Global Technologies, Inc.
SMASolarTechnologyAG
Sonnenallee 1
34266 Niestetal
Germany
Tel. +49 561 9522-0
Fax +49 561 9522-100
www.SMA.de
E-mail: info@SMA.de
© 2004 to 2015SMASolarTechnologyAG. All rights reserved.
Operating ManualSSMUXX15-BE-en-102
SMA Solar Technology AG
Table of Contents
Table of Contents
1 Information on this Document ................................................. 6
1.1 Validity................................................................................................ 6
1.2 Target Group...................................................................................... 6
1.3 Additional Information....................................................................... 6
1.4 Symbols .............................................................................................. 6
1.5 Typographies...................................................................................... 7
1.6 Nomenclature..................................................................................... 7
2 Safety......................................................................................... 8
2.1 Intended Use ...................................................................................... 8
2.2 Safety Information.............................................................................. 9
2.3 Personal Protective Equipment........................................................... 11
3 Scope of Delivery...................................................................... 12
4 Product Overview..................................................................... 13
4.1 SMA String-Monitor........................................................................... 13
4.2 External View of the DC Subdistribution........................................... 14
4.3 Components of the DC Subdistribution ............................................ 15
4.4 Terminals on the Electronic Assembly............................................... 17
4.5 Type Label .......................................................................................... 18
4.6 Symbols on the Product ..................................................................... 19
4.7 LEDs on the Electronic Assembly....................................................... 20
5 Mounting ................................................................................... 21
5.1 Selecting the Mounting Location....................................................... 21
5.2 Mounting the SMA String-Monitor on the Wall............................... 23
6 Installation................................................................................. 25
6.1 Overview of the Connection Area of the SMA String-Monitor....... 25
6.2 Grounding ......................................................................................... 27
6.2.1 Information on Grounding............................................................. 27
6.2.2 Grounding the Electronic Assembly.............................................. 27
6.2.3 Grounding the DC Surge Arrester ................................................ 27
6.3 Installation of the DC Main Cables .................................................. 28
Operating Manual 3SSMUXX15-BE-en-10
Table of Contents
6.3.1 Safety during Installation of the DC Main Cables....................... 28
6.3.2 Options for Installation of the DC Main Cables .......................... 28
6.3.3 Connecting the DC Main Cables to the Busbar using Terminal
Lugs................................................................................................. 29
6.3.4 Connecting the DC Main Cables to the Busbar using V Box
Terminals......................................................................................... 32
6.3.4.1 Requirements and Conditions................................................. 32
6.3.4.2 Installing the Box Terminal on the Busbar.............................. 33
6.3.4.3 Connecting Copper Cables to V-Box Terminal...................... 34
6.3.4.4 Connecting Aluminum Cables to V Box Terminal.................. 35
SMA Solar Technology AG
6.4 Connecting the Ethernet Cables........................................................ 36
6.5 Connection of Sensors....................................................................... 39
6.5.1 Connecting Temperature Sensors ................................................. 39
6.5.2 Connecting an Irradiation Sensor or Anemometer to the
Analog Input................................................................................... 39
6.6 Connecting the Remote Terminal to the Digital Input....................... 40
6.7 Connecting the Remote Terminal to the Digital Output ................... 41
6.8 Installation of the String Cables ........................................................ 42
6.8.1 Requirements for Installation of the String Cables ....................... 42
6.8.2 Installing the String Cables............................................................ 42
7 Commissioning the DC Subdistribution................................... 45
8 Disconnecting and Reconnecting............................................. 46
8.1 Safety When Disconnecting and Reconnecting Voltage Sources .. 46
8.2 Disconnecting the DC Subdistribution............................................... 47
8.3 Switching the DC Subdistribution Back On...................................... 47
9 Troubleshooting ........................................................................ 49
9.1 LED States........................................................................................... 49
9.1.1 Status LEDs of the SMA String-Monitor ........................................ 49
9.1.2 LEDs of the Network Connection.................................................. 50
9.2 Performing an Update ....................................................................... 51
10 Maintenance ............................................................................. 52
10.1 Safety during Maintenance............................................................... 52
10.2 Maintenance Schedule and Consumables ...................................... 53
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SMA Solar Technology AG
10.2.1 Notes on Maintenance Work....................................................... 53
10.2.2 Maintenance Work Every 24 Months.......................................... 53
Table of Contents
10.3 Maintenance Work............................................................................ 54
10.3.1 Checking the DC Load-Break Switch............................................ 54
10.3.2 Checking the Protective Covers..................................................... 55
10.3.3 Performing the Visual Inspection ................................................... 55
10.3.4 Checking the Condensate Drain................................................... 56
10.3.5 Checking the Vent Plug.................................................................. 56
10.3.6 Checking the Seals ........................................................................ 56
10.3.7 Checking the Labels....................................................................... 57
10.3.8 Checking the LEDs.......................................................................... 58
10.3.9 Checking the Bolted, Clamp and Plug Connections.................... 58
10.3.10 Checking the Inline Fuse Connectors............................................ 59
10.3.11 Checking the Ground Connection ................................................ 59
10.4 Completing Maintenance Work ....................................................... 59
11 Decommissioning ...................................................................... 60
11.1 Decommissioning the DC Subdistribution......................................... 60
11.2 Disassembling the DC Subdistribution from the Wall...................... 60
11.3 Packing the DC Subdistribution......................................................... 61
11.4 Storing the DC Subdistribution.......................................................... 61
11.5 Disposing of the DC Subdistribution................................................. 61
12 Periodic Actions......................................................................... 62
12.1 Inserting the Cables ........................................................................... 62
12.1.1 Leading Cables through Enclosure Opening with Membrane.... 62
12.1.2 Leading Cables through Enclosure Opening with Cable Gland 62
12.2 Disassembling and Mounting the Protective Covers........................ 63
13 Technical Data........................................................................... 65
14 Accessories ................................................................................ 72
15 Contact....................................................................................... 74
Operating Manual 5SSMUXX15-BE-en-10
1 Information on this Document
SMA Solar Technology AG
1 Information on this Document
1.1 Validity
This document is valid for the SMAString-Monitor of the following device types from production
version A1:
• SSM-U-1615
• SSM-U-2415
• SSM-U-3215
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 and using
electrical devices and systems
• Training in the installation and commissioning of electrical devices and systems
• Knowledge of all applicable standards and directives
• Knowledge of and adherence to this manual and all safety precautions
1.3 Additional Information
Links to additional information can be found at www.SMA-Solar.com.
1.4 Symbols
Symbol Explanation
Indicates a hazardous situation which, if not
avoided, will result in death or serious injury
Indicates a hazardous situation which, if not
avoided, can result in death or serious injury
Indicates a hazardous situation which, if not
avoided, can result in minor or moderate injury
Indicates a situation which, if not avoided, can
result in property damage
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
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SMA Solar Technology AG
1 Information on this Document
1.5 Typographies
Typographies Use Example
bold
>
[Button/Key]
• Display messages
• Elements on a user
interface
• Terminals
• Slots
• Elements to be selected
• Elements to be entered
• Connects several elements
to be selected
• Button or key to be
selected or pressed
• Set parameter WGra to
0.2.
• Select PV system >
Detect.
• Select [Start detection].
1.6 Nomenclature
In this document, the SMAString‑Monitor is also referred to as "DC subdistribution" or "product".
Operating Manual 7SSMUXX15-BE-en-10
2 Safety
SMA Solar Technology AG
2 Safety
2.1 Intended Use
The SMAString‑Monitor is a PV array junction box to which several strings can be connected in
parallel. The SMAString-Monitor monitors the input currents of the strings and detects failures, thus
helping to minimize power and yield losses.
The SMAString‑Monitor can be operated in large-scale PV power plants with central inverters from
SMA Solar Technology AG or other PV inverters.
The maximum current values for the SMAString-Monitor must not be exceeded.
The SMAString-Monitor should only be operated when the strings are fuse protected. SMA Solar
Technology AG guarantees safe operation of the SMAString-Monitor with inline fuse connectors as
string fuses, providing that the inline fuse connectors are connected directly to the DC connectors of
the string cables on the DC subdistribution. For any other type or location of the string fusing, SMA
Solar Technology AG cannot guarantee safe operation of the SMAString-Monitor or compliance
with the required thresholds. The inline fuse connectors are available as accessories.
The product is suitable for indoor and outdoor use.
All work on the product must only be performed using appropriate tools and in compliance with the
ESD protection regulations.
The installation of SMA accessories in the product is permissible without specific approval by SMA
Solar Technology AG, providing that the product supports the given SMA accessories (see
Section14, page72).
The product must only be used in countries for which it is approved or released by SMA Solar
Technology AG and 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 usually void 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
appropriate.
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.
The type label must remain permanently attached to the product.
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SMA Solar Technology AG
2 Safety
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 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.
• Unless live voltage is absolutely necessary, always disconnect the product from voltage
sources before performing any work (see Section8 "Disconnecting and Reconnecting",
page46).
Danger to life from electric shock due to live DC cables
DC cables connected to PV modules that are exposed to sunlight are energized. Touching live
cables results in death or serious injury due to electric shock.
• Prior to assembling the DC cables, ensure that the DC cables are voltage-free.
• Wear suitable personal protective equipment for all work on the product.
Danger to life from electric shock due to ground fault
If there is a ground fault, system components that are supposedly grounded may in fact be live.
Touching incorrectly grounded components results in death or serious injuries from electric shock.
• Before working on the system, ensure that no ground fault is present.
• Wear suitable personal protective equipment for all work on the product.
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.
Operating Manual 9SSMUXX15-BE-en-10
2 Safety
SMA Solar Technology AG
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.
Danger to life from electric shock if the DC load-break switch is damaged
Switching the DC load-break switch at temperatures belowthe specified threshold may damage
the DC load-break switch. The threshold is: ‒25°C. In this case, reliable disconnection can no
longer be guaranteed.
If the DC load-break switch is switched in spite of visible damage, again the reliable
disconnection function cannot be guaranteed.
High voltages are present in components that are not properly disconnected. Touching live
components can result in death or serious injury due to electric shock.
• Do not switch the DC load-break switch at temperatures below the specified threshold. The
threshold is: ‒25°C.
• Do not switch the DC load-break switch if it is visibly damaged.
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.
• Wear suitable personal protective equipment for all work on the product.
Damage to the PV system due to incorrectly rated fuses
If fuses are incorrectly rated, excessive reverse currents can destroy the PV modules.
• Observe the maximum current values for the product when rating the fuses.
Operating ManualSSMUXX15-BE-en-1010
SMA Solar Technology AG
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 threshold.
The threshold for humidity is: 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.
• 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.
• Temperature at the storage location must be in the specified range. The temperature range
is: ‒40°Cto+70°C.
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 elements. Only then is it safe to touch
electronic components.
2 Safety
2.3 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 categoryS3 with perforation-proof soles and steel toe
caps
☐ During precipitation or on moist ground, safety boots of categoryS5 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.
Operating Manual 11SSMUXX15-BE-en-10
3 Scope of Delivery
SMA Solar Technology AG
3 Scope of Delivery
Check the scope of delivery for completeness and any externally visible damage. Contact your
distributor if the scope of delivery is incomplete or damaged.
Figure 1: Components included in the scope of delivery
Position Quantity Designation
A 1 SMAString-Monitor
B 1 Switch cabinet key
C 4 Size-reducing seal inserts
D 1 Operating manual and circuit diagram
Operating ManualSSMUXX15-BE-en-1012
SMA Solar Technology AG
4 Product Overview
4 Product Overview
4.1 SMAString-Monitor
The SMAString‑Monitor is a PV array junction box to which several strings can be connected in
parallel. The SMAString‑Monitor can be operated in large-scale PV power plants with central
inverters from SMA Solar Technology AG or other PV inverters.
The essential tasks performed by the SMAString-Monitor are:
• to bundle the input currents of the strings
• to measure the input currents of the strings and transfer these to the inverter
• to transmit information on the input currents of the strings
This enables failures to be recognized and power and yield losses to be minimized.
Principle of a grid-tie PV system with SMAString-Monitor
Figure 2: Principle of a grid-tie PV system with SMAString-Monitor
Position Designation
A PV array
B SMAString-Monitor
C Sunny Central
D Transformer
E Utility grid
Operating Manual 13SSMUXX15-BE-en-10
4 Product Overview
4.2 External View of the DC Subdistribution
Figure 3: External view of the DC subdistribution
Position Designation
A Lock cylinder
B Wall bracket lugs
C Vent plug
D Enclosure openings for introducing the cables
SMA Solar Technology AG
Operating ManualSSMUXX15-BE-en-1014
SMA Solar Technology AG
4.3 Components of the DC Subdistribution
4 Product Overview
Figure 4: Components of the DC subdistribution
Position Designation
A DC overvoltage protection
B DC Load-Break Switch
C Terminal for connection of the DC overvoltage protection unit to the functional
grounding
Operating Manual 15SSMUXX15-BE-en-10
4 Product Overview
Position Designation
D Rotary handle of the DC load-break switch
E Electronic assembly
Protective covers
SMA Solar Technology AG
Figure 5: Position of the protective covers
Position Designation
A Top protective cover
B Bottom protective cover
Operating ManualSSMUXX15-BE-en-1016
1 2 3 4 5 6 7 8 9 1112 14
A
B
C
D
E
F
G
H
K
L
M
N
OP
Q
I
SMA Solar Technology AG
4 Product Overview
4.4 Terminals on the Electronic Assembly
Figure 6: Terminals on the electronic assembly
Position Designation Explanation
A ‒ Connection of string cable harnesses (PV+) and, depend-
ing on the version, of the plug-in board (MEU) for the num-
ber of PV inputs (factory installed)
B X1 Analog current input
C X2 Analog input temperature sensor external 1 (EXT 1)
D X3 Analog input temperature sensor external 2 (EXT 2)
E X4 Digital customer input
F X5 Digital input surge arrester DC
G X6 Status alarm contact DC load-break switch
H X7 Ethernet communication output LAN OUT
I X8 Terminal for the functional grounding cable of the elec-
tronic assembly
K X9 Ethernet communication input LAN IN
L LWLPB 1 Slot for the OF interface module (communication input
LWL IN)
M LWLPB 2 Slot for the OF interface module (communication output
LWL OUT)
N ‒ Digital output of potential-free change-over contact
Operating Manual 17SSMUXX15-BE-en-10
4 Product Overview
Position Designation Explanation
O ‒ Slot for the power supply assembly for external 230V
supply voltage to the SMAString-Monitor via the inverter
P ‒ Terminal for supply voltage of the SMAString-Monitor
from the PV field (PV-) (factory installed)
Q ‒ Fuse for the supply voltage of the SMAString-Monitor
from the PV field
SMA Solar Technology AG
AC
4.5 Type Label
The type label clearly identifies the product.
You will require the information on the type label to use the product safely and when seeking
customer support from Service (see Section15, page74). The type label must remain permanently
attached to the product.
SMAString-Monitor
There are two type labels attached to the SMAString‑Monitor. The type labels are located on the
inside of the right-hand door and on the right-hand outside panel of the SMAString‑Monitor.
You can read off the following data from the type label:
• Date of manufacture (Fabrication Date)
• Serial number (SER)
• Device type (SSM-U-XXXX XX/XX/XX)
• Device-specific characteristics
Electronic assembly
There is one type label attached to the electronic assembly. The type label is located at the top left
of the electronic assembly.
You can read off the following data from the type label:
• Production version (FA)
• Serial number (SER)
• Assembly type and version (SSM30BASE.XXX)
Plug-in board (MEU) for the number of PV inputs
There is one type label attached to the plug-in board.
You can read off the following data from the type label:
• Production version (FA)
• Serial number (SER)
• Assembly type and version (SSM30MEU.XXX)
Operating ManualSSMUXX15-BE-en-1018
SMA Solar Technology AG
4 Product Overview
4.6 Symbols on the Product
The following gives an explanation of all the symbols found on the SMAString-Monitor and on the
type label.
Symbol Designation Explanation
CE marking The product complies with the requirements of the applica-
ble EU directives.
DataMatrix code 2Dcode for device-specific characteristics
Degree of protectionIP54
Protection class II The product has a reinforced or double insulation be-
WEE marking Do not dispose of the product together with household
Beware of dangerous
voltage
Beware of hot surface The product can get hot during operation. Avoid contact
Observe the documentation
The product is protected against interior dust deposits and
splashing water from all angles.
tween grid current circuit and output voltage.
waste but in accordance with the locally applicable dis-
posal regulations for electronic waste.
The product operates at high voltages. All work on the
product must be carried out by qualified persons only.
during operation. Allow the product to cool down suffi-
ciently before carrying out any work. Wear personal pro-
tective equipment such as safety gloves.
Observe all documentation supplied with the product.
Operating Manual 19SSMUXX15-BE-en-10
L‒L+
LK/ACT
SPEED
LK/ACT
SPEED
UPD
ERR
AL
PWR
COM
A
B
C
D
E
4 Product Overview
SMA Solar Technology AG
4.7 LEDs on the Electronic Assembly
Figure 7: LEDs on the electronic assembly
Position Designation Color Explanation
A UPD yellow Update status of the SMAString-Moni-
tor
ERR red Error in the SMAString-Monitor
AL green Firmware status of the SMAString-
Monitor
PWR green Voltage supply status of the
SMAString-Monitor
COM yellow Communication status of the
SMAString-Monitor
B LK/ACT green Status/activity of the network connec-
tion at the communication output
C SPEED yellow Speed of the network connection at
the communication output
D LK/ACT green Status/activity of the network connec-
tion at the communication input
E SPEED yellow Speed of the network connection at
the communication input
A description of the LED states will by given in (see Section9.1, page49).
Operating ManualSSMUXX15-BE-en-1020
SMA Solar Technology AG
5 Mounting
5 Mounting
5.1 Selecting the Mounting Location
Fire hazard due to wrong choice of mounting location
Despite careful construction, electrical devices can cause fires.
• Do not mount the DC sub-distribution on flammable construction materials.
• Do not mount the DC sub-distribution in areas containing highly flammable materials.
• Do not mount the DC sub-distribution in potentially explosive atmospheres.
Requirements for the mounting location:
☐ The mounting location can be outdoors or indoors.
☐ The mounting location must not be in a living or office area.
☐ The mounting location must not block any escape routes.
☐ The mounting location must be freely and safely accessible at all times without the necessity for
any auxiliary equipment (e.g. scaffolding or lifting platforms). Non-fulfillment of these criteria
may restrict servicing.
☐ The mounting location must be shaded, e.g. under a protective roof.
☐ The mounting location must be suitable for the weight and dimensions of the SMA
SunnyString‑Monitor.
☐ The mounting location must be suitable for the wind load.
☐ Mounting space below the SMAStringMonitor when using the inline fuse connectors:
at least 800mm.
Requirements for mounting the SMAString-Monitor
☐ Mount the SMASunnyString-Monitor so that the connection area is facing downwards.
☐ Mount the SMAString-Monitor in a horizontal position.
☐ Do not mount the SMAString Monitor in a twisted manner.
☐ Do not mount the SMASunnyString‑Monitor in a horizontal or inclined position.
☐ An external cable support rail must be provided.
Example: Mounting on PV array substructure
• If the PV array is mounted on a free-standing
structure, the DC subdistribution can be fixed to
this structure in a shaded position. In this case,
make sure that there is no danger of rainwater
flowing off the module surface and over the
enclosure of the DC subdistribution.
Operating Manual 21SSMUXX15-BE-en-10
5 Mounting
Dimensions and anchoring points:
Figure 8: Dimensions and anchoring points
Position Explanation
A 630.00mm
B 600.00mm
C 573.00mm (space between anchoring points)
D 825.60mm (space between anchoring points)
E 850.00mm
F 250.00mm
SMA Solar Technology AG
Operating ManualSSMUXX15-BE-en-1022
SMA Solar Technology AG
Observe minimum clearances:
Figure 9: Minimum clearances
Position Explanation
A 200mm
B 650mm
C 800mm
D 150mm
E 650mm
5 Mounting
5.2 Mounting the SMAString-Monitor on the Wall
Risk of injury when lifting the DC sub-distribution, or if it is dropped
There is risk of injury if the DC sub-distribution is lifted incorrectly or dropped while being
transported or when attaching it to or removing it from the wall mounting bracket. Weight of the
DC sub-distribution without installed accessories: 35 kg.
• Two persons are required for mounting and disassembling the DC sub-distribution.
• Carefully lift and transport the DC sub-distribution.
Additionally required mounting material (not included in the scope of delivery):
• For mounting the DC subdistribution on a wall:
– 4 screws M6. Take the wall properties into account when selecting the screws.
– 4 washers
Operating Manual 23SSMUXX15-BE-en-10
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