SMA SSM-U-1615 User Manual

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OperatingManual

SMAString-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 BluetoothSIG,Inc. and any use of these marks by SMASolarTechnologyAG 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.

SMASolarTechnologyAG

Operating ManualSSMUXX15-BE-en-102

SMA Solar Technology AG

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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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 SMAString-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 SMAString‑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 SMAString‑Monitor is a PV array junction box to which several strings can be connected in parallel. The SMAString-Monitor monitors the input currents of the strings and detects failures, thus helping to minimize power and yield losses.

The SMAString‑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 SMAString-Monitor must not be exceeded. The SMAString-Monitor should only be operated when the strings are fuse protected. SMA Solar

Technology AG guarantees safe operation of the SMAString-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 SMAString-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 Section14, page72).

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.

Operating ManualSSMUXX15-BE-en-108

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 Section8 "Disconnecting and Reconnecting", page46).

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.

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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 belowthe 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.

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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°Cto+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 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.

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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 SMAString-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

4.1 SMAString-Monitor

The SMAString‑Monitor is a PV array junction box to which several strings can be connected in parallel. The SMAString‑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 SMAString-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 SMAString-Monitor

Figure 2: Principle of a grid-tie PV system with SMAString-Monitor

Position Designation

A PV array B SMAString-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

E F

G H

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

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4 Product Overview

Position Designation Explanation

O ‒ Slot for the power supply assembly for external 230V

supply voltage to the SMAString-Monitor via the inverter P ‒ Terminal for supply voltage of the SMAString-Monitor

from the PV field (PV-) (factory installed) Q ‒ Fuse for the supply voltage of the SMAString-Monitor

from the PV field

SMA Solar Technology AG

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 Section15, page74). The type label must remain permanently attached to the product.

SMAString-Monitor

There are two type labels attached to the SMAString‑Monitor. The type labels are located on the inside of the right-hand door and on the right-hand outside panel of the SMAString‑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)

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4 Product Overview

4.6 Symbols on the Product

The following gives an explanation of all the symbols found on the SMAString-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 2Dcode for device-specific characteristics

Degree of protectionIP54

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

UPD ERR AL PWR COM

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 SMAString-Moni-

tor ERR red Error in the SMAString-Monitor AL green Firmware status of the SMAString-

Monitor PWR green Voltage supply status of the

SMAString-Monitor COM yellow Communication status of the

SMAString-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 Section9.1, page49).

Operating ManualSSMUXX15-BE-en-1020

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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

SunnyString‑Monitor. ☐ The mounting location must be suitable for the wind load. ☐ Mounting space below the SMAStringMonitor when using the inline fuse connectors:

at least 800mm.

Requirements for mounting the SMAString-Monitor

☐ Mount the SMASunnyString-Monitor so that the connection area is facing downwards. ☐ Mount the SMAString-Monitor in a horizontal position. ☐ Do not mount the SMAString Monitor in a twisted manner. ☐ Do not mount the SMASunnyString‑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 630.00mm B 600.00mm C 573.00mm (space between anchoring points) D 825.60mm (space between anchoring points) E 850.00mm F 250.00mm

SMA Solar Technology AG

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SMA Solar Technology AG

Observe minimum clearances:

Figure 9: Minimum clearances

Position Explanation

A 200mm B 650mm C 800mm D 150mm E 650mm

5 Mounting

5.2 Mounting the SMAString-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

5 Mounting

SMA Solar Technology AG

– 4 screw anchors if necessary. Take the wall properties into account when selecting the

screw anchors.

• For mounting the DC subdistribution on the PV module substructure: – 4 screws M6 – 4 washers – 4 nuts

Procedure:

1. Close the DC subdistribution.

2. Mark the position of the drill holes on the wall or support structure.

3. Drill holes at the marked positions.

4. If necessary, insert screw anchors.

5. Fasten the DC subdistribution to the wall or substructure using suitable screws and washers.

6. Ensure that the DC subdistribution is securely attached.

Operating ManualSSMUXX15-BE-en-1024

SMA Solar Technology AG

6 Installation

6.1 Overview of the Connection Area of the SMA StringMonitor

View from Below

Figure 10: View of the SMAString-Monitor from below

Position Designation

A Enclosure opening with cable gland for the main cable DC+ B Enclosure opening with string cable harness (PV+) and DC connectors (factory pre-

assembled) C Condensate drain D Enclosure opening with string cable harness (PV‒) and DC connectors (factory pre-

assembled) E Enclosure opening with cable gland for the main cable DC‒ F Enclosure opening with membrane for the following cables:

• Communication

• Sensors

• External functional grounding for the electronic assembly

• External functional grounding for the DC surge arrester

G Enclosure opening with cable gland for the cables of the external 230VAC voltage

supply H Enclosure opening with cable gland for the external functional grounding cable of

the power supply assembly

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6 Installation

Interior View

SMA Solar Technology AG

Figure 11: Interior view of the DC subdistribution

Position Designation

A Busbar for connecting the main cables DC+ B Busbar for connecting the main cables DC‒ C Terminal plate for connecting external functional grounding of the DC surge

arrester

D Cable channel

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Position Designation

E Electronic assembly F Strain relief for the cables

6.2 Grounding

6.2.1 Information on Grounding

The parts to be grounded can be connected to a joint grounding electrode.

6.2.2 Grounding the Electronic Assembly

6 Installation

Cable requirement:

☐ Conductor cross-section: 6mm

Procedure:

1. Lead the grounding cable through the corresponding enclosure opening (see Section6.1, page25) into the DC subdistribution (see Section12.1, page62).

2. Strip the grounding cable by 15mm. Make sure that no pieces of cable are dropped into the DC subdistribution.

3. Connect the grounding cable to the electronic assembly at screw terminal X8 FE (see Section4.4, page17) to ground the electronic assembly.

4. Ensure that the grounding cable is securely fixed.

5. Attach the grounding cable to the strain relief in the DC subdistribution using a cable tie.

6. Ground the grounding cable in the vicinity of the DC subdistribution, e.g. by means of a grounding electrode.

6.2.3 Grounding the DC Surge Arrester

In order to guarantee the function of the DC surge arrester, it must be connected to the external grounding.

Cable requirements:

☐ Conductor cross-section: 16mm2 to 35mm ☐ Recommended cable type: NYY-O

Procedure:

1. Lead the grounding cable through the corresponding enclosure opening (see Section6.1, page25) into the DC subdistribution (see Section12.1, page62).

2. Strip the grounding cable by 15mm. Make sure that no pieces of cable are dropped into the DC subdistribution.

3. Route the grounding cable in the cable channel to the connecting terminal plate for functional grounding of the DC surge arrester (see Section4.4, page17). To do this, you can remove and reattach the cover of the cable channel.

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4. Release the screw on the connecting terminal plate, insert the grounding cable and fasten the screw (torque: 3.2Nm).

5. Ensure that the grounding cable is securely fixed.

6. Attach the grounding cable to the strain relief in the DC subdistribution using a cable tie.

7. Ground the grounding cable in the vicinity of the DC subdistribution, e.g. by means of a grounding electrode.

SMA Solar Technology AG

6.3 Installation of the DC Main Cables

6.3.1 Safety during Installation of the DC Main Cables

Risk of fire due to failure to observe torque specifications on voltage-carrying bolted connections

Failure to follow the specified torques reduces the transmission capacity of live bolted connections and the contact resistances increase. This can cause components to overheat and catch fire.

• Ensure that live bolted connections are always tightened with the exact torque specified in this document.

• When working on the device, use suitable tools only.

• Avoid repeated tightening of live bolted connections, as this may result in inadmissibly high torques.

Damage to the electronic assembly by the DC main cables

When inserting the DC main cables into the DC subdistribution, it is possible to damage the electronic assembly.

• When inserting the DC main cables, keep them far enough away from the electronic assembly.

Failure of data transmission due to incorrect cable routing

Non-compliance with the minimum clearances between the DC main cables and the data cable may lead to failure of data transmission. This can result in yield loss.

• When laying the DC main cables, ensure that the minimum clearance of 200mm to the data cables is observed.

6.3.2 Options for Installation of the DC Main Cables

You can regularly connect up to two DC main cables per pole. The required material for the bolted connections is already preassembled on the busbar. Further material may be required depending on the connection type and the cable type.

The following options for connecting the DC main cables are available:

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6 Installation

Connecting the DC main cables to the busbar using terminal lugs(see Section6.3.3, page29 )

• DC main cable 70mm2 to 400mm2 made of aluminum or copper – Aluminum cable: additionally required material: bimetal ring terminal lugs – Copper cable: tin-plated copper ring terminal lugs are preassembled

Connecting the DC main cables to the busbar using V box terminals(see Section6.3.4, page32)

• DC main cable 70mm2 to 300mm2 made of aluminum or copper

Additionally required material: V box terminals (see Section6.3.4.1 "Requirements and Conditions", page32) (see Section14, page72)

6.3.3 Connecting the DC Main Cables to the Busbar using Terminal Lugs

Cable requirements for connection with terminal lugs:

☐ Use copper or aluminum cables only. ☐ The cables must be designed for the maximum PV voltage. ☐ Maximum number of cables per potential: 2 ☐ Permitted cable cross-section: 70mm2 to 400 mm

Terminal lug requirements:

☐ For the connection of copper cables, use only tin-plated copper tube terminal lugs. ☐ For the connection of aluminum cables, use only bimetal tube terminal lugs. ☐ For the connection, use only the screws, nuts and washers which are preassembled on the

busbar. ☐ The terminal lugs must be designed for the given temperature. Temperature: +95°C ☐ The width of the terminal lugs must exceed the washer diameter. Washer diameter: 32mm.

This will ensure that the defined torques are effective over the whole surface. ☐ Maximum width of the terminal lugs when connecting two cables per potential: 48mm.

If using cables with small cross-sections, the cable lugs can be installed next to each other.

If using cables with large cross-sections, the cable lugs must be installed one behind the other.

Additionally required mounting material (not included in the scope of delivery):

☐ For the connection of copper cables: tin-plated copper tube terminal lugs for screw size M12 ☐ Clean cloth ☐ Ethanol cleaning agent

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Assembly of the Connection with One Terminal Lug

Figure 12: Assembly of the Connection with One Terminal Lug

Position Designation

A Screw M12 B Washer C Tin-plated copper busbar D Tin-plated tube terminal lug E Fender washer F Spring washer G Nut M12

SMA Solar Technology AG

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Assembly of the Connection with Two Terminal Lugs

Position Designation

A Screw M12 B Washer C Tin-plated copper busbar D Fender washer E Spring washer F Nut M12 G Tin-plated tube terminal lug

6 Installation

Procedure:

1. Ensure that the DC subdistribution is switched off and secured against reconnection (see Section8 "Disconnecting and Reconnecting", page46).

2. Ensure that the inverter is disconnected on the DC side and secured against reconnection (see inverter manual).

3. Lead the DC main cables into the DC subdistribution through the designated enclosure opening (see Section6.1, page25) with the appropriate seal insert (see Section12.1, page

62).

4. Fit the DC main cables with tube terminal lugs. Make sure that no pieces of cable are dropped into the DC subdistribution.

5. In the DC subdistribution, remove the fastening material for the DC main cables from the busbars.

6. Clean the contact surfaces using a clean cloth and ethanol cleaning agent. Do not touch the contact surfaces after cleaning.

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7. Connect the DC main cables to the busbars for the DC main cables (torque: 60 Nm) (see Section6.1, page25). To do this, use only the fastening material already attached to the busbars and do not connect more than two DC main cables to each busbar.

8. Ensure that the DC main cables are securely attached.

9. Secure the DC main cables to the external cable support rail.

6.3.4 Connecting the DC Main Cables to the Busbar using V Box Terminals

6.3.4.1 Requirements and Conditions

Cable requirements for connection with V box terminals:

☐ Use copper or aluminum cables only. ☐ The cables must be designed for the maximum PV voltage. ☐ The cables must have double or reinforced insulation. ☐ Maximum number of cables per potential: 2 ☐ Permitted cable cross-section: 70mm2 to 300 mm ☐ Permitted conductor cross-section:

Cable type Conductor cross-section per potential

Round, single-strand 70mm2to150mm Round, multi-strand 70mm2to300mm Sectoral, single-strand 70mm2to240mm Sectoral, multi-strand 70mm2to240mm

Additionally required mounting material (not included in the scope of delivery):

☐ Clean cloth ☐ Ethanol cleaning agent

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6.3.4.2 Installing the Box Terminal on the Busbar

Assembly of the Connection with One Box Terminal

Figure 13: Assembly of the Connection with One Box Terminal

Position Designation

A Screw M12 B Washer C Tin-plated copper busbar D Fender washer E Spring washer F Nut M12 G Box terminal

6 Installation

Installing the Box Terminal on the Busbar

1. Ensure that the DC subdistribution is switched off and secured against reconnection (see Section8 "Disconnecting and Reconnecting", page46).

2. Ensure that the inverter is fully disconnected from voltage sources on the DC side and secured against reconnection (see inverter manual).

3. In the DC subdistribution, remove the fastening material for the DC main cables from the busbars.

4. Clean the contact surfaces on the busbar and box terminal using a clean cloth and ethanol cleaning agent. Do not touch the contact surfaces after cleaning.

5. Mount the box terminals on the busbar (torque: 60 Nm). To do this, use only the fastening material already attached to the busbars.

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6.3.4.3 Connecting Copper Cables to V-Box Terminal

Risk of fire from contact failure

Grease on the set screw can result in failure to reach the prescribed torque. Contact failure and increased transition resistances are the result. This can cause components to overheat and catch fire.

• Insert the insulated conductors into the box terminal from below. Ensure that no grease comes into contact with the set screw.

Procedure:

1. Ensure that the DC subdistribution is switched off and secured against reconnection (see Section8 "Disconnecting and Reconnecting", page46).

2. Ensure that the inverter is fully disconnected from voltage sources on the DC side and secured against reconnection (see inverter manual).

3. Unscrew the set screw of the box terminal with an Allen key.

4. If you are using a cable with cable cross-section 185mm2 to 300mm2, remove the insert in the box terminal and reinsert it the other way round. The insert on the box terminal has a small and a large clamping area. The insert must be reinserted so that the side for the larger clamping area points towards the DC main cable to be clamped.

5. Lead the DC main cables into the DC subdistribution through the designated enclosure openings (see Section6.1, page25) with the appropriate seal insert (see Section12.1, page

62). Ensure correct polarity.

6. Strip the DC main cables by 35mm.

7. Connect one DC main cable to each box terminal. To do this, insert the conductors into the box terminal from below and fasten the set screw of the box terminal (torque: 32 Nm).

8. Ensure that the DC main cables are securely attached.

9. Secure the DC main cables to the external cable support rail.

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6.3.4.4 Connecting Aluminum Cables to V Box Terminal

Upon contact with oxygen, an oxide film forms on aluminum surfaces. This oxide film increases transition resistances. For this reason, the insulated conductors of the aluminum cables must be cleaned immediately before connecting them. If they are not to be connected immediately after cleaning, the cable ends will need greasing. This prevents the formation of a new oxide film. We recommend connecting the greased conductors to the box terminals within eight hours.

Risk of fire through connection of soiled or oxidized aluminum cables

Connecting soiled or oxidized DC main cables reduces the ampacity of the live terminals, thereby increasing the transition resistances. This can cause components to overheat and catch fire.

• Only connect clean and oxide-free conductors of the aluminum cables.

• Ensure that the conductors are free of iron particles.

• Connect the insulated conductors to the terminals within ten minutes of cleaning.

Risk of fire from contact failure

• Insert the insulated conductors into the box terminal from below. Ensure that no grease comes into contact with the set screw.

Procedure:

1. Ensure that the DC subdistribution is switched off and secured against reconnection (see Section8 "Disconnecting and Reconnecting", page46).

2. Ensure that the inverter is fully disconnected from voltage sources on the DC side and secured against reconnection (see inverter manual).

3. Unscrew the set screw of the box terminal with an Allen key.

5. Lead the DC main cables into the DC subdistribution through the designated enclosure openings (see Section6.1, page25) with the appropriate seal insert (see Section12.1, page

62). Ensure correct polarity.

6. Strip the DC main cables by 35mm.

7. Remove any oxide film from the insulated conductors of the DC main cable e.g. with a sharp knife. Do not use files, sandpaper or brushes.

8. Ensure that no further contamination builds up on the insulated conductors.

9. If you do not connect the insulated conductors within ten minutes of cleaning, grease them. This prevents the formation of an oxide film.

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10. Unscrew the set screw of the box terminal with an Allen key (AF 6).

11. Connect one DC main cable to each box terminal. To do this, insert the conductors into the box terminal from below and fasten the set screw of the box terminal (torque: 32 Nm).

12. Ensure that the DC main cables are securely attached.

13. Secure the DC main cables to the external cable support rail.

6.4 Connecting the Ethernet Cables

Up to ten SMAString-Monitors can be connected in line topology to each string monitoring communication terminal of the inverter (for number of string monitoring communication terminals, see inverter manual).

The Ethernet cables are connected to LSA+ terminals on the electronic assembly using an LSA+ insertion tool.

Interference in data transmission due to unshielded power cables

If unshielded power cables are used, they generate an electromagnetic field during operation which may induce interference in network cables during data transmission.

• When laying network cables, observe the following minimum clearances to unshielded energy cables:

– For installation without separating strip: at least 200mm – For installation with aluminum separating strip: at least 100mm – For installation with steel separating strip: at least 50mm

Requirements for Ethernet cables:

☐ Cable type: copper, two-conductor ☐ Number of insulated conductor pairs and insulated conductor cross-section: 4 x 2 x 0.125mm

to 0.205mm ☐ Cable type: at least Cat5 with shielding S-UTP, F-UTP or higher ☐ Maximum cable length: 100m

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System topology for Ethernet communication:

Figure 14: System topology for Ethernet communication with SMAString-Monitor (example)

Position Designation

A SMAString-Monitor B Inverter (example)

6 Installation

Procedure:

1. Lead the Ethernet cable through the corresponding enclosure opening (see Section6.1, page25 ) into the DC subdistribution (see Section12.1, page62).

2. Prepare the Ethernet cable for connection as follows:

• Strip 44mm cable sheath off the end of the connection cable which is to be attached to the DC subdistribution.

• Shorten the cable shield to 15mm.

• Fold the surplus cable shield back over the cable sheath.

3. Press the Ethernet cable with the cable shield into the shield clamp. The cable shield must be clamped under the shield clamp as completely as possible.

4. Connect the Ethernet cables to the LSA+ terminals on the electronic assembly using the LSA+ insertion tool:

• To connect the communication output, connect all eight conductors of the Ethernet cable to the electronic assembly at terminal X7 (see Section4.4, page17) according to the following table. Trim any overlapping conductors.

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• To connect the communication input, connect all eight conductors of the Ethernet cable to the electronic assembly at terminal X9 (see Section4.4, page17) according to the following table. Trim any overlapping conductors.

Signal Terminal

X7 and X9

TX+ 1

EIA/TIA 568B (eight-conductor) Insulated conductor color

white/orange

(white/orange)

TX- 2

orange/white or orange

(orange/white or orange)

RX+ 3

white/green

(white/green)

not assigned 4

blue/white or blue

(blue/white or blue)

not assigned 5

white/blue

(white/blue)

RX- 6

green/white or green

(green/white or green)

not assigned 7

white/brown

(white/brown)

not assigned 8

brown/white or brown

(brown/white or brown)

5. Ensure that the Ethernet cables are securely connected.

6. Attach the Ethernet cables to the strain relief in the DC subdistribution using a cable tie.

7. Connect the Ethernet cable for the communication output in the inverter (see inverter manual) or in the next DC subdistribution in the communication bus.

8. Secure the Ethernet cables to the external cable support rail.

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6.5 Connection of Sensors

6.5.1 Connecting Temperature Sensors

You can connect two temperature sensors, e.g., ambient temperature sensor or module temperature sensor, in the DC subdistribution. The measured values from the temperature sensors are shown on the user interface of the inverter. The sensors can be connected using two-, three- or four-conductor connection technology.

Cable requirements:

☐ Conductor cross-section: 0.08mm2 to 1.00mm ☐ External cable diameter: 3.2mm to 6.5mm

Additionally required material (not included in the scope of delivery):

☐ 1 ambient temperature sensor or 1 module temperature sensor ☐ 1 connection cable

Requirement:

☐ The sensor must be technically suitable for connection to the temperature inputs of the DC

subdistribution (see Section13, page65).

Procedure:

1. Connect the cable to the sensor (see manufacturer manual). Trim the unneeded insulated conductors up to the cable shield and note down the conductor colors.

2. Lead the other end of the cable through the corresponding enclosure opening (see Section6.1, page25) into the DC subdistribution (see Section12.1, page62).

3. Prepare the cable for connection as follows:

• Remove 40mm of cable sheath at the end of the cable.

• Strip the conductors by 6mm.

4. Lead the cable through the cable channel as far as terminal X2 or X3 (see Section4.4, page17 ) of the electronic assembly and out of one of the lateral slits in the cable channel. To do this, you can remove and reattach the cover of the cable channel.

5. Connect the cable to terminal X2 or X3 (see Section4.4, page17) of the electronic assembly according to the circuit diagram. Observe the pin assignment.

6. Attach the cable to the cable support rail in the DC subdistribution.

6.5.2 Connecting an Irradiation Sensor or Anemometer to the Analog Input

You can connect one irradiation sensor or one anemometer in the DC subdistribution. The measured values from the sensors are shown on the user interface of the inverter.

Cable requirements:

☐ Number of insulated conductors: at least two ☐ Shielding: yes ☐ Conductor cross-section: 0.08mm2 to 1mm

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☐ Maximum cable length: 30m ☐ External cable diameter: 3.2mm to 6.5mm

Additionally required material (not included in the scope of delivery):

☐ 1 irradiation sensor or 1 anemometer ☐ 1 connection cable

Requirement:

☐ The sensor must be technically suitable for connection to the analog input of the DC

subdistribution (see Section13, page65).

Procedure:

1. Connect the cable to the sensor (see manufacturer manual). Trim the unneeded insulated conductors up to the cable shield and note down the conductor colors.

2. Lead the other end of the cable through the corresponding enclosure opening (see Section6.1, page25) into the DC subdistribution (see Section12.1, page62).

3. Prepare the cable for connection as follows:

• Remove 40mm of cable sheath at the end of the cable.

• Strip the conductors by 6mm.

4. Lead the cable through the cable channel as far as terminal X1 (see Section4.4, page17) of the electronic assembly and out of one of the lateral slits in the cable channel. To do this, you can remove and reattach the cover of the cable channel.

5. Connect the cable to terminal X1 (see Section4.4, page17) of the electronic assembly according to the circuit diagram. Observe the pin assignment.

6. Attach the cable to the cable support rail in the DC subdistribution.

6.6 Connecting the Remote Terminal to the Digital Input

You can connect e.g. a remote signaling contact to the digital input of the DC subdistribution.

Cable requirements:

☐ Number of insulated conductors: at least two ☐ Conductor cross-section: 0.08mm2 to 1mm ☐ Maximum cable length: 30m ☐ External cable diameter: 3.2mm to 6.5mm

Additionally required material (not included in the scope of delivery):

☐ 1 remote terminal ☐ 1 connection cable

Requirement:

☐ The remote terminal must be technically suitable for connection to the digital input of the DC

subdistribution (see Section13, page65).

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Procedure:

1. Connect the cable to the remote terminal (see manufacturer manual). Trim the unneeded insulated conductors up to the cable shield and note down the conductor colors.

2. Lead the other end of the cable through the corresponding enclosure opening (see Section6.1, page25) into the DC subdistribution (see Section12.1, page62).

3. Prepare the cable for connection as follows:

• Remove 40mm of cable sheath at the end of the cable.

• Strip the conductors by 6mm.

4. Lead the cable through the cable channel as far as terminal X4 (see Section4.4, page17) of the electronic assembly and out of one of the lateral slits in the cable channel. To do this, you can remove and reattach the cover of the cable channel.

5. Connect the cable to terminal X4 (see Section4.4, page17) of the electronic assembly according to the circuit diagram. Observe the pin assignment.

6. Attach the cable to the cable support rail in the DC subdistribution.

6.7 Connecting the Remote Terminal to the Digital Output

You can connect e.g. a warning light to the digital output of the DC subdistribution.

Cable requirements:

☐ Number of insulated conductors: at least two ☐ Conductor cross-section: 0.5mm2 to 6mm ☐ Maximum cable length: 30m ☐ External cable diameter: 3.2mm to 10.2mm

Additionally required material (not included in the scope of delivery):

☐ 1 remote terminal ☐ 1 connection cable

Requirement:

☐ The remote terminal must be technically suitable for connection to the digital output of the DC

subdistribution (see Section13, page65).

Procedure:

1. Connect the cable to the remote terminal (see manufacturer manual). Trim the unneeded insulated conductors up to the cable shield and note down the conductor colors.

2. Lead the other end of the cable through the corresponding enclosure opening (see Section6.1, page25) into the DC subdistribution (see Section12.1, page62).

3. Prepare the cable for connection as follows:

• Remove 80mm of cable sheath at the end of the cable.

• Strip the conductors by 12mm.

4. Connect the cable to terminal X10 (see Section4.4, page17) of the electronic assembly according to the circuit diagram. Observe the pin assignment.

5. Attach the cable to the cable support rail in the DC subdistribution.

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6.8 Installation of the String Cables

6.8.1 Requirements for Installation of the String Cables

Requirement:

☐ Apart from installation of the string cables, all other installation work must be completed.

Requirements for the PV modules per input:

☐ The thresholds for the input voltage and the input current of the DC subdistribution must be

adhered to (see Section13, page65).

☐ On the coldest day based on statistical records, the open-circuit voltage of the PV array must

never exceed the maximum input voltage of the DC subdistribution.

☐ The positive connection cables of the PV modules must be fitted with the positive DC

connectors (for information on assembling DC connectors, see the DC connector installation manual).

☐ The negative connection cables of the PV modules must be fitted with the negative DC

connectors (for information on assembling DC connectors, see the DC connector installation manual).

Use of Y adapters for parallel connection of strings

The Y adapters must not be used to interrupt the DC circuit under load.

• In order to interrupt the DC circuit, disconnect the DC subdistribution from all voltage sources (see Section8.2, page47).

6.8.2 Installing the String Cables

The SMAString-Monitor is supplied with string cable harnesses and DC connectors fitted at the factory.

Danger to life due to electric shock from live PV voltage

As soon as the string cables are connected, the electronic assembly and other voltage-carrying components will be energized. Touching live components results in death or serious injury due to electric shock.

• Wear suitable protective equipment for all work.

• Do not touch any live components.

• Always install string cables right at the end of the installation work.

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Danger to life due to electric arc

An electric arc may occur when plugging or removing the DC connectors or the inline fuse connectors under load and in case of a reverse-poled connection of the DC connectors. Electric arcs can result in death or serious injury.

• Ensure the correct polarity of the strings before connection.

• Plug or remove DC connectors and inline fuse connectors only under load-free conditions.

• Disconnect the DC sub-distribution (see the DC sub-distribution manual).

• Wear suitable personal protective equipment.

Damage to the DC connectors due the use of contact cleaner of other cleaning agents

Some contact cleaners or other cleaning agents may contain substances that decompose the plastic of the DC connectors.

• Do not use contact cleaners or other cleaning agents for cleaning the DC connectors.

Damage to the DC subdistribution due to moisture ingress

The DC subdistribution is only properly sealed when all unused DC inputs are closed with suitable protective caps on the DC connectors.

• For any unused DC inputs of the DC subdistribution, fit appropriate protective caps of the SUNCLIX plug-in system onto the DC connectors of the string cables of the DC subdistribution. The protective caps are available from Phoenix Contact.

Cable requirements:

☐ Cable type: PV 1-F ☐ Conductor cross-section for 6mm2 DC connector: 2.5mm2 to 6.0mm

☐ Cable diameter for 6mm2 DC connector: 5.0mm to 8.0mm ☐ Conductor cross-section for 16mm2 DC connector: 6.0mm2 to 16.0mm

☐ Cable diameter for 16mm2 DC connector: 5.5mm to 10.0mm

Additionally required material (not included in the scope of delivery):

☐ For any unused DC inputs:

SUNCLIX protective caps for DC connectors

Procedure:

1. Ensure that the DC subdistribution is switched off and secured against reconnection (see Section8 "Disconnecting and Reconnecting", page46).

2. Ensure that there is no ground fault in the PV array (see service manual at www.SMASolar.com).

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3. On the DC subdistribution, remove the protection foil from the cable harnesses for connection of the PV strings.

4. If inline fuse connectors are used, connect the inline fuse connectors to the assembled DC connectors of the PV module string cables (see installation manual "IFCON Inline Fuse Connector Set16").

5. Connect the PV module string cables PV+ to the DC subdistribution:

• Connect the assembled DC connectors of the PV module string cables (PV+) to the string cable harnesses (PV+) of the DC subdistribution:

– If using inline fuse connectors, plug the inline fuse connectors of the PV module string

cables (PV+) into the string cable harness (PV+) of the DC subdistribution.

☑ The inline fuse connectors snap into place.

– If no inline fuse connectors are used, plug the assembled DC connectors of the PV

module string cables (PV+) into the DC connectors of the string harness (PV+) in the DC subdistribution.

☑ The DC connectors snap into place.

6. Connect the string cables PV module PV‒ to the DC subdistribution:

• Connect the assembled DC connectors of the PV module string cables (PV‒) to the string cable harness (PV‒) of the DC subdistribution:

– If using inline fuse connectors, plug the inline fuse connectors of the PV module string

cables (PV‒) into the string cable harness (PV‒) of the DC subdistribution.

☑ The inline fuse connectors snap into place.

– If no inline fuse connectors are used, plug the assembled DC connectors of the PV

module string cables (PV‒) into the DC connectors of the string cable harness (PV‒) in the DC subdistribution.

☑ The DC connectors snap into place.

7. Ensure that all DC connectors are securely connected.

8. Close any unused terminals on the string cable harnesses of the DC subdistribution with protective caps of the SUNCLIX plug-in system for DC connectors. This will seal the DC connectors.

9. Fasten the string cables to the external cable support rail.

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7 Commissioning the DC Subdistribution

The commissioning report of the inverter must be completed during commissioning.

Requirements:

☐ The DC load-break switch must be switched off. ☐ The DC main cables must be connected to the inverter or DC main distribution box and

disconnected from voltage sources.

☐ There is no reverse voltage from the inverter. ☐ Voltage supply to the DC subdistribution must be present. ☐ All connections must have been executed in accordance with this manual (see Section6,

page25).

☐ The correct polarity of all connections must be ensured and documented. ☐ The floor around the DC subdistribution must be firm and freely accessible.

Procedure:

1. Complete the commissioning report

2. Switch the DC subdistribution on (see Section8.3, page47).

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SMA Solar Technology AG

8 Disconnecting and Reconnecting

8.1 Safety When Disconnecting and Reconnecting Voltage Sources

Danger to life from electric shock due to live voltage

High voltages are present in the live components of the DC subdistribution. 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 issued by the module manufacturer.

• Disconnect the DC subdistribution from voltage sources (see Section8.2, page47)

Danger to life from electric shock if the DC load-break switch is damaged

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 inline fuse connectors

During operation, the temperature of the inline fuse connectors can reach up to 90°C. Touching the inline fuse connectors can result in burns.

• Only touch the inline fuse connectors wearing suitable personal protective equipment.

• Position hot, removed inline fuse connectors in such a way that they cannot be touched inadvertently.

• Mount the inline fuse connectors in such a way that air can circulate around them. Cooling the inline fuse connectors by the ambient air is absolutely necessary.

• Mount the inline fuse connectors in such a way that they cannot be touched inadvertently. Ensure that air circulation around the inline fuse connectors is not prevented.

Operating ManualSSMUXX15-BE-en-1046

SMA Solar Technology AG

8 Disconnecting and Reconnecting

8.2 Disconnecting the DC Subdistribution

1. Disconnect the inverter DC side from voltage sources and secure against inadvertent reconnection (see inverter manual).

2. If available, disconnect the external supply voltage of the DC subdistribution (see manual of the inverter or manual of the external voltage source).

3. Disconnect all DC subdistributions that are connected in parallel in the DC connection area and secure against inadvertent reconnection (see manual of the respective DC subdistribution). How to disconnect the DC subdistribution specified in this manual is described in the following steps.

4. Open the door of the DC subdistribution.

5. Switch the DC load-break switch off by turning the rotary handle on the DC load-break switch to 0 (OFF, green zone). This disconnects the PV array connected to the DC subdistribution from the inverter.

☑ The arrow on the rotary handle is pointing to 0 (OFF, green zone). The handle is in a

horizontal position.

6. Secure the DC load-break switch against reconnection. You can do this by attaching a padlock (diameter: max. 6mm) to the red inner section of the handle. You can push the red inner section out from below.

7. Ensure that the string inputs are load-free.

8. Release and remove all DC connectors. To do this, insert a regular or angled screwdriver (blade width: 3.5mm) into one of the slide slots and pull the DC connectors straight out. Do not pull on the cable.

9. Ensure that no voltage is present in the DC subdistribution. Tip: Use the voltage test points in the protective cover to measure the voltage in the DC subdistribution.

10. If the work can be carried out with the door of the DC subdistribution closed, close the door.

11. If the work to be carried out requires the door of the DC subdistribution to be open, secure the door so that it cannot slam shut.

8.3 Switching the DC Subdistribution Back On

1. Open the door of the DC subdistribution.

2. Ensure that the DC load-break switch in the DC subdistribution is switched off and secured against reconnection.

Operating Manual 47SSMUXX15-BE-en-10

8 Disconnecting and Reconnecting

SMA Solar Technology AG

3. Ensure that there is no ground fault in the PV array (see service manual at www.SMASolar.com).

4. Remount the protective covers on the DC subdistribution (see Section12.2, page63).

5. Connect all the DC connectors to the DC subdistribution.

6. If an anti-reconnection lock has been installed on the rotary handle of the DC load-break switch, remove the lock.

7. Switch the DC load-break switch on by turning the rotary handle to I (ON, red zone).

☑ The arrow on the rotary handle is pointing to I (ON, red zone). The handle is now in a

vertical position.

8. Close the door of the DC subdistribution.

9. Switch all other DC subdistributions back on (see DC subdistribution manual).

10. Switch the inverter back on (see inverter manual).

11. If available, reconnect the external supply voltage of the DC subdistribution (see manual of the inverter or manual of the external voltage source).

Operating ManualSSMUXX15-BE-en-1048

SMA Solar Technology AG

9 Troubleshooting

9.1 LED States

9.1.1 Status LEDs of the SMAString-Monitor

An overview of the LEDs can be found in Section4.7, page20.

LED Status Cause and corrective measure

UPD (yellow) Off* No update in progress at present.

flashing Update in progress at present.

ERR (red) On The electronic assembly is defective.

Corrective measures:

• Contact the Service (see Section15, page74).

Off Normal operation

AL (green) Off* The firmware is faulty.

Corrective measures:

• Update the firmware of the SMAString-Monitor (see inverter manual).

On The firmware is faulty.

Corrective measures:

• Update the firmware of the SMAString-Monitor (see inverter manual).

flashing The firmware is OK.

PWR (green) Off Supply voltage is too low or too high.

Corrective measures:

• Make sure that the supply voltage to the DC subdistribution is OK.

– If you are using the power supply assembly

for the external power supply (available as an accessory), ensure that the external 230V supply voltage is correctly connected (see manual "Power Supply Assembly for External Power Supply of SMAString-Monitors").

– Ensure that the supply voltage of the DC

subdistribution from the PV field is correctly connected.

On The supply voltage is OK.

9 Troubleshooting

Operating Manual 49SSMUXX15-BE-en-10

9 Troubleshooting

SMA Solar Technology AG

LED Status Cause and corrective measure

COM (yellow) Off* At present no data exchange in progress.

On At present data exchange in progress. flashing At present no data exchange in progress.

* If the LED ERR is on, an error has occurred.

9.1.2 LEDs of the Network Connection

LED Status Cause and corrective measure

LK/ACT (green) Off No network connection established.

The DC subdistribution is not connected to the voltage supply.

Corrective measures:

• Connect the DC subdistribution to the voltage supply.

No network connection established. The network cable is not properly connected to the

DC subdistribution or other devices in the communication bus.

Corrective measures:

• Ensure that the network cables are correctly connected to the DC subdistribution (see Section6.4, page36).

• Ensure that the network cables are correctly connected to the other devices in the communication bus.

No network connection established. One or more network components, network cables or

connectors are defective or damaged.

Corrective measures:

• Replace the defective or damaged network components, network cables or connectors.

on Network connection established. flashing Network connection established.

Data is being sent or received.

SPEED (yellow) Off Network connection established.

The data transfer rate is up to 10Mbit/s.

on Network connection established.

The data transfer rate is up to 100Mbit/s.

Operating ManualSSMUXX15-BE-en-1050

SMA Solar Technology AG

9 Troubleshooting

9.2 Performing an Update

SMAString-Monitor updates are carried out via the SMA inverter (see inverter manual).

Operating Manual 51SSMUXX15-BE-en-10

10 Maintenance

SMA Solar Technology AG

10 Maintenance

10.1 Safety during Maintenance