SMA GRID CONNECT BOX 12 User Manual
Operating Manual
GRID CONNECT BOX 12
GRID-BOX-12-3-20-BE-en-10 | Version 1.0 ENGLISH
Legal Provisions SMA Solar Technology AG
Legal Provisions
The information contained in this document is the property of SMA Solar Technology AG. Publishing its content, either
partially or in full, requires the written permission of SMA Solar Technology AG. Any internal company copying of the
document for the purposes of evaluating the product or its correct implementation is allowed and does not require
permission.
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
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
Torx
and Pozidriv® are registered trademarks of Phillips Screw Company.
®
is a registered trademark of Acument Global Technologies, Inc.
®
word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of these
SMA Solar Technology AG
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 2015 SMA Solar Technology AG. All rights reserved.
2 GRID-BOX-12-3-20-BE-en-10 Operating Manual
SMA Solar Technology AG Table of Contents
Table of Contents
1 Information on this Document. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.4 Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.5 Typographies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.6 Nomenclature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Intended Use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3 Scope of Delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4 Product Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Grid Connect Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
5 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.1 Storing the Grid Connect Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.2 Requirements for Mounting. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
5.3 Preparing the Mounting Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.4.1 Transport Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
5.4.2 Transporting and Mounting the Grid Connect Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
6 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1 Overview of the Connection Area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.1.1 Components and Terminals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
6.1.2 Enclosure Openings in the Floor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
6.2 Deactivating All-Pole Disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.3 Connecting the Multicluster Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.4 Connecting the Utility Grid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.5 Connecting the Control Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.6 Mounting the Kick Plates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Preparing the Multicluster System for Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
8 Disconnecting the Grid Connect Box and Multicluster System . . . . . . . . . . . . . . . . . . . . . . . . . 22
9 Periodic Actions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9.1 Disassembling the Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
9.2 Mounting the Protective Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
9.3 Inserting the Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
9.4 Connection to Spring-Cage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
9.4.1 Connecting Power Cables to Spring-Cage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26
9.4.2 Connecting Control Cables to Spring-Cage Terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Operating Manual GRID-BOX-12-3-20-BE-en-10 3
Table of Contents SMA Solar Technology AG
10 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
10.1 Inspection of Residual-Current Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
10.2 Checking the Surge Arresters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
10.3 Maintenance Work Every 12 Months . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
11 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
11.1 Disassembling the Grid Connect Box. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
11.2 Disposing of the Grid Connect Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
12 Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .32
13 Contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
4 GRID-BOX-12-3-20-BE-en-10 Operating Manual
SMA Solar Technology AG 1 Information on this Document
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1 Information on this Document
1.1 Validity
This document is valid for the device type GRID CONNECT BOX 12.3-20 (Grid Connect Box 12).
1.2 Target Group
The activities described in this document must only be performed by qualified persons. Qualified persons must have the
following skills:
• Training in how to deal with the dangers and risks associated with installing and operating electrical devices and
batteries
• Training in the installation and commissioning of electrical devices
• Knowledge of and adherence to the local standards and directives
• Knowledge of and compliance with this document and all safety information
1.3 Additional Information
Links to additional information can be found at www.SMA-Solar.com.
Document title Document type
MULTICLUSTER BOX 12 Installation – circuitry overview
MULTICLUSTER BOX 12 Operating manual
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
Operating Manual GRID-BOX-12-3-20-BE-en-10 5
1 Information on this Document SMA Solar Technology AG
1.5 Typographies
Typography Use Example
bold • Display messages
• Parameters
•Terminals
•Slots
• Elements to be selected or
entered
> • Links several elements to be
selected
[Button/Key] • Button on device to be selected
or pressed
• Connect the line conductors to the
spring-cage terminals L1, L2 and L3 at
terminal X301:8-10.
•Press the [TEST] button on each
residual-current device in the
Grid Connect Box.
1.6 Nomenclature
Complete designation Designation in this document
Grid Connect Box 12 Grid Connect Box
Multicluster Box 12 Multicluster Box
–
6 GRID-BOX-12-3-20-BE-en-10 Operating Manual
SMA Solar Technology AG 2 Safety
BATFUSE
SUNNY ISLAND
GRID-BOX
Load contactor
MULTICLUSTER BOX
(Main AC distribution board)
PV main
distribution box
(not included in the
delivery)
BATTERY
Generator contactor
GENERATOR
LOAD
PV MODULES
PV inverters
UTILITY
GRID
2 Safety
2.1 Intended Use
The Grid Connect Box is an automatic transfer switch which enables the safe operation of the utility grid and a generator
as energy sources of an SMA Multicluster System.
Figure1: Circuitry principle of the multicluster system with the Grid Connect Box
The technical connection requirements of the grid operator and the local standards and directives specify if the
multicluster system, in the event of grid failure, disconnects from the utility grid at all poles or only the line conductors.
The Grid Connect Box is always delivered with all-pole disconnection. If all-pole disconnection is not permitted, this
configuration of the Grid Connect Box must be deactivated (see Section6.2, page18).
If the Grid Connect Box is used with all-pole disconnection, the utility grid must be configured as a TN-S, TN-C-S or TT
system. If the Grid Connect Box is used without all-pole disconnection, the utility grid must be configured as a TN-C-S
system (for grounding in the multicluster system see operating manual of the Multicluster Box).
Do not exceed the maximum AC connection power of the Grid Connect Box. Cables with copper wires must be used for
the installation.
Operating Manual GRID-BOX-12-3-20-BE-en-10 7
2 Safety SMA Solar Technology AG
I terms of interference immunity, the product is suitable for EMC environment A, and in terms of EMC emissions, it is
suitable for EMC environment B* .
Only operate the Grid Connect Box in conjunction with Multicluster Box.
The Grid Connect Box is designed for use at altitudes up to 3,000 m above mean sea level. If you wish to use the
Grid Connect Box at elevations above 3,000 m, contact the SMA Service Line (see Section13, page35).
The Grid Connect Box is designed for indoor use only. Only operate the product at temperatures between − 25°C and
+60°C.
All work on the product must only be performed using appropriate tools and in compliance with the ESD protection
regulations.
Suitable personal protective equipment is to be worn by all persons working on or with the product.
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., modifications or conversions, are only permitted with the express written permission of
SMA Solar Technology AG. Unauthorized alterations will void guarantee and warranty claims and in most cases
terminate the operating license. SMA Solar Technology AG shall not be held liable for any damage caused by such
alterations.
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.
* in accordance with IEC 61439-1:2011
8 GRID-BOX-12-3-20-BE-en-10 Operating Manual
SMA Solar Technology AG 2 Safety
'$1*(5
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&$87,21
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 or 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 due to electric shock
High voltages are present in the Grid Connect Box and the multicluster system. Touching live components results in
death or serious injury due to electric shock.
• Disconnect the Grid Connect Box and multicluster system from all voltage sources before carrying out any work
on the Grid Connect Box (see Section8, page22).
• Always operate the Grid Connect Box with its protective cover in place.
• All work on the Grid Connect Box must be carried out by qualified persons only.
• Do not touch any live components in the Grid Connect Box or any other devices of the multicluster system.
Risk of injury if the Grid Connect Box tips over
The Grid Connect Box is heavy and may tip over if not properly fastened to the support surface. This can result in
crushing injuries.
• After installation, attach the Grid Connect Box to the support surface.
Risk of burns due to hot components
Components and terminals inside the Grid Connect Box can get hot during operation. Touching hot components can
cause burns.
• Always operate the Grid Connect Box with its protective cover in place.
• Prior to removing the protective cover, let the Grid Connect Box cool down.
Operating Manual GRID-BOX-12-3-20-BE-en-10 9
3 Scope of Delivery SMA Solar Technology AG
3 Scope of Delivery
Check the scope of delivery for completeness and any apparent external damage. Contact your distributor if any parts
of the delivery are missing or damaged.
Figure2: Components included in the scope of delivery
Position Quantity Designation
A 1 Grid Connect Box
B 1 2-pole N bridge
C 10 Cable clamp with counter sleeve (22 mm to 28 mm)
D 2 Fuse link (1 A, tripping characteristic gG)
E 2 LV/HRC fuse link (200 A, tripping characteristic: gG)
F 1 Operating manual
10 GRID-BOX-12-3-20-BE-en-10 Operating Manual
SMA Solar Technology AG 4 Product Description
4 Product Description
4.1 Grid Connect Box
The Grid Connect Box is an automatic transfer switch which enables the safe operation of the utility grid and a generator
as energy sources of an SMA Multicluster System.
Figure3: Grid Connect Box with cabinet door open
Position Designation Explanation
A Protective cover Prevents inadvertent contact with live components during
operation and thus protects from electric shocks. When the
Grid Connect Box is in operation, the protective cover must
always be mounted.
B Fuse holder 1 A Used as receptacles for cylindrical thermal fuses (1 A, tripping
characteristic gG). The thermal fuses protect the connected
conductors from excessive heat build-up due to overload or short
circuits.
C Residual-current device Protects against electric shock and is always used in addition to
existing protective measures such as insulation or protective
grounding. As soon as a dangerous touch voltage occurs, the
residual-current device switches the loads off at all poles.
This is achieved by means of a summation current transformer in
the residual-current device which detects the electric currents in
the conductors L1, L2, L3 and N. In the normal operating state,
the sum of these currents equals zero. Under fault conditions a
differential current is formed which trips the residual-current
device.
Operating Manual GRID-BOX-12-3-20-BE-en-10 11
4 Product Description SMA Solar Technology AG
Residual-current device
Figure4: Overview of the residual-current device
Position Designation Explanation
A Test button The functionality of the residual-current device must be tested
regularly (see Section10.1, page28).
B Switch lever Top position: ON - residual-current device is switched on.
Bottom position: OFF - residual-current device has tripped or
is switched off.
12 GRID-BOX-12-3-20-BE-en-10 Operating Manual
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