SMA BOX M-20 User Manual

EN

Switching device for Backup systems

AUTOMATIC SWITCH BOX M-20/L-20

Installation Guide

AS-BOX-M_L-IA-IEN110320 | IMEN-AS-BOX-M_L | Version 2.0

SMA Solar Technology AG Table of Contents

Table of Contents

1 Notes on this Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.1 Validity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.2 Target Group . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.3 Additional Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

1.4 Symbols Used . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.1 Appropriate usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

2.2 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3 Explanation of Symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.3.1 Symbols on the Type Label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

2.3.2 Symbols in the Automatic Switch Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3 Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.1 Automatic Switch Box M. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

3.2 Automatic Switch Box L. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

4 Mounting the Automatic Switch Box . . . . . . . . . . . . . . . . 14

5 Electrical Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.1 Overview of the Connection Area . . . . . . . . . . . . . . . . . . . . . . 20

5.1.1 Automatic Switch Box M. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

5.1.2 Automatic Switch Box L. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5.2 Inserting the cable. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

5.3 Connecting functional and operational grounding. . . . . . . . . . 30

5.4 Activating the phase coupling for 1-phase Backup System . . . 32

5.5 Connecting Loads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

5.6 Connecting the PV Plant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

5.7 Connecting the Feed-in Meter. . . . . . . . . . . . . . . . . . . . . . . . . . 37

5.8 Connecting the Consumption Meter . . . . . . . . . . . . . . . . . . . . . 38

Installation Guide AS-BOX-M_L-IA-IEN110320 3

Table of Contents SMA Solar Technology AG

5.9 Connecting the Sunny Backup . . . . . . . . . . . . . . . . . . . . . . . . . 40

5.10 Connecting External Signal for Battery Feed-In . . . . . . . . . . . . 41

5.11 Connecting the Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

5.12 Connecting the Communication Cables . . . . . . . . . . . . . . . . . . 44

6 Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

6.1 Dimensioning the thermal fuse for loads . . . . . . . . . . . . . . . . . . 46

6.2 Dimensioning the thermal fuse for the generator . . . . . . . . . . . 47

6.3 Commission the Automatic Switch Box . . . . . . . . . . . . . . . . . . . 48

7 Disconnecting the Automatic Switch Box from

voltage sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

8 Maintenance and Cleaning. . . . . . . . . . . . . . . . . . . . . . . . 50

9 Decommissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51

9.1 Dismantling the Automatic Switch Box . . . . . . . . . . . . . . . . . . . 51

9.2 Storing the Automatic Switch Box. . . . . . . . . . . . . . . . . . . . . . . 52

9.3 Disposing of the Automatic Switch Box . . . . . . . . . . . . . . . . . . 52

10 Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

10.1 Automatic Switch Box M-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

10.2 Automatic Switch Box L-20 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57

11 Contact . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61

4 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 1Notes on this Guide

1 Notes on this Guide

1.1 Validity

This guide applies to the following device types:

•AS-BOX-M-20

•AS-BOX-L-20

1.2 Target Group

This guide is for electrically skilled persons. The tasks described in this manual may be performed by
electrically skilled persons only.

1.3 Additional Information

Additional information regarding the Sunny Backup system and the Automatic Switch Box can be
found in the FAQ section at www.SMA.de/en.

1.4 Symbols Used

The following types of safety warnings and general information are used in this guide:

"DANGER" indicates a hazardous situation which, if not avoided, will result in death or
serious injury!

"WARNING" indicates a hazardous situation which, if not avoided, could result in death
or serious injury!

"CAUTION" indicates a hazardous situation which, if not avoided, could result in minor
or moderate injury!

"NOTICE" indicates a situation that can result in property damage if not avoided!

Important

Important indicates important information.

Installation Guide AS-BOX-M_L-IA-IEN110320 5

2Safety SMA Solar Technology AG

2Safety

2.1 Appropriate usage

The Automatic Switch Box is a switching unit for Backup systems. The Sunny Backup regulates and
controls the Automatic Switch Box and forms a stand-alone grid in case of a power outage. During a
grid failure, the Automatic Switch Box safely disconnects the connected PV plant and the connected
loads from the power distribution grid and connects them to the stand-alone grid.

In case you ordered the Automatic Switch Box with generator connection, you can include a
generator into your Backup system. If a generator is included into the Backup system, it can be
connected to the stand-alone grid via the Automatic Switch Box in case of a grid failure, if required.

The Automatic Switch Box M-20 and the Automatic Switch Box L-20 are both suited for TT systems
and TN systems.

You may operate the Automatic Switch Box M-20 only in combination with a Sunny Backup 5000
and the Automatic Switch Box L-20 only in combination with 3 Sunny Backup 5000. In a 3-phase
Backup system you must configure one of the 3 Sunny Backup systems as a master and the other 2
as slave. The Sunny Backup master evaluates the data recorded in the Automatic Switch Box,
coordinates all switching operations and controls all components of the Backup system. You will find
further information in the Sunny Backup 5000 manual.

Do not exceed the maximum connection power of the individual outgoing lines in the
Automatic Switch Box. You will find the maximum connection power in section 10”Technical
Data”,page53.

Do not use the Automatic Switch Box for purposes other than those described here. Alternative uses,
modifications, and the installation of components void the warranty claims and operation permit.

This guide is part of the Automatic Switch Box. Pay attention to all the activities described in this guide.
Keep this guide in a convenient place for future reference.

6 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 2Safety

Principle of a 3-phase Backup system including an Automatic Switch Box

Installation Guide AS-BOX-M_L-IA-IEN110320 7

2Safety SMA Solar Technology AG

2.2 Safety Instructions

Danger to life due to high voltages.

• All work on the Automatic Switch Box must be performed by electrically skilled persons.

2.3 Explanation of Symbols

2.3.1 Symbols on the Type Label

Symbol Description

Beware of dangerous electrical voltage.
The Automatic Switch Box operates at high voltages. All work on the

Automatic Switch Box must be performed by electrically skilled persons.

Beware of hot surface.
The Automatic Switch Box can become hot during operation. Avoid contact during

operation.

Observe all documents provided.

Do not dispose of the Automatic Switch Box and its components via the household
garbage (see section 9.3”Disposing of the Automatic Switch Box”,page52).

CE mark.
The Automatic Switch Box complies with the requirements of the applicable EC

guidelines.

Protection rating IP54.
The Automatic Switch Box is protected against dust deposits in the interior and

splashes of water from all angles. Complete contact protection.

Protection class II.
The Automatic Switch Box has a double insulation and is therefore protected

against direct as well as indirect contact.

8 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 2Safety

2.3.2 Symbols in the Automatic Switch Box

Symbol Description

Beware of dangerous electrical voltage.
The Automatic Switch Box operates at high voltages. The covers inside the

Automatic Switch Box serve as contact protection. Do not open covers
during operation.

Beware of dangerous electrical voltage.
After you have disconnected the Automatic Switch Box, the capacitors on

the control board will take 5 minutes to discharge. Wait 5 minutes before
opening the cover.

Installation Guide AS-BOX-M_L-IA-IEN110320 9

3Scope of delivery SMA Solar Technology AG

3Scope of delivery

3.1 Automatic Switch Box M

Figure1:Scope of delivery of the Automatic Switch Box M

Position Number Description

A 1 Automatic Switch Box

B 1 Switch cabinet key

C4Exterior attachment

D4Plug

E 1 Communication cable; red

F 1 Communication cable; black

G 3 Warning sticker: "Automatic emergency backup-up power system

present!"; german, english, greek

H 3 Warning sticker: "Phase coupling"; german, english, greek

I 1 Push-in type jumper bar

K 4 Fuse link D02; 40 A

L 4 Headed sleeve for fuse link D02; 40 A

M 3 M32x1.5 cable gland; reduced grip range

N 3 M25x1.5 cable gland

O 3 M20x1.5 cable gland; reduced grip range

10 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 3Scope of delivery

Position Number Description

P 1 M20x1.5 cable gland

Q1 Counter nut M32

R3Counter nut M25

S4Counter nut M20

T 1 Installation Guide

Installation Guide AS-BOX-M_L-IA-IEN110320 11

3Scope of delivery SMA Solar Technology AG

3.2 Automatic Switch Box L

Figure2:Scope of delivery for the Automatic Switch Box L

Position Number Description

A 1 Automatic Switch Box

B 1 Switch cabinet key

C4Exterior attachment

D4Plug

E 3 Communication cable; red

F 1 Communication cable; black

G 3 Warning sticker: "Automatic emergency backup-up power system

present!"; german, english, greek

H 1 Push-in type jumper bar

I 3 Fuse link D02; 63 A

K 3 Fuse link D02; 50 A

L 3 Headed sleeve for fuse link D02; 50 A

M 5 M32x1.5 cable gland

N 3 M25x1.5 cable gland

O 3 M20x1.5 cable gland; reduced grip range

P 1 M20x1.5 cable gland

Q4 Counter nut M32

*

*

12 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 3Scope of delivery

Position Number Description

R3Counter nut M25

S4Counter nut M20

T 1 Reduction M50-M32

U1Counter nut M50

V 1 Installation Guide

*

optional

Installation Guide AS-BOX-M_L-IA-IEN110320 13

4Mounting the Automatic Switch Box SMA Solar Technology AG

4 Mounting the Automatic Switch Box

Requirements for the mounting location:

Danger to life due to fire or explosion.

• Do not mount the Automatic Switch Box on flammable construction materials.

• Do not mount the Automatic Switch Box near highly flammable construction materials.

• Do not mount the Automatic Switch Box in potentially explosive areas.

☐ Foundation consists of solid material.
☐ The foundation is suitable for the weight and dimensions of the Automatic Switch Box (see

section 10”Technical Data”,page53).
☐ The mounting location is accessible at all times.
☐ Climatic conditions are met (see section 10”Technical Data”,page53).
☐ Mounting location is not exposed to direct sunlight.
☐ Mounting location is protected against splashes of water.
☐ Technical connection requirements of the network operator are met.

Mounting position:

Figure3:Permitted and prohibited mounting positions

14 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 4Mounting the Automatic Switch Box

Minimum distances of the Automatic Switch Box M:

Figure4:Distances to be observed for Automatic Switch Box M

Installation Guide AS-BOX-M_L-IA-IEN110320 15

4Mounting the Automatic Switch Box SMA Solar Technology AG

Minimum distances of the Automatic Switch Box L:

Figure5:Distances to be observed for Automatic Switch Box L

16 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 4Mounting the Automatic Switch Box

Dimensions of the Automatic Switch Box M:

Figure6:Dimensions of the Automatic Switch Box M with exterior attachments mounted

Installation Guide AS-BOX-M_L-IA-IEN110320 17

4Mounting the Automatic Switch Box SMA Solar Technology AG

Dimensions of the Automatic Switch Box L:

Figure7:Dimensions of the Automatic Switch Box L with exterior attachments mounted

18 AS-BOX-M_L-IA-IEN110320 Installation Guide

SMA Solar Technology AG 4Mounting the Automatic Switch Box

Risk of injury due to the heavy weight of the Automatic Switch Box.

• Take the weight of the Automatic Switch Box into account (see section 10”Technical
Data”,page53).

1. Insert the exterior attachments vertically into the
rack on the backside of the Automatic Switch Box.

Hint: The exterior attachments can also be inserted
horizontally into the racks on the backside of the
Automatic Switch Box.

2. Move the upper exterior attachments upwards and
fasten them with plugs. If the exterior attachments
are inserted horizontally, move them sideways.

3. Move the lower exterior attachments downwards
and fasten them with plugs. If the exterior
attachments are inserted horizontally, move them
sideways.

4. Mark the position of the drill holes. Take the dimensions into account.

5. Drill the holes and insert suitable wall anchors.

6. Screw in the M8-screws. Leave the screws protruding out a bit.

7. Hang the Automatic Switch Box, including the
exterior attachments, onto the screws.

Installation Guide AS-BOX-M_L-IA-IEN110320 19

5Electrical Connection SMA Solar Technology AG

5 Electrical Connection

5.1 Overview of the Connection Area

5.1.1 Automatic Switch Box M

Interior View

Figure8:Interior components of the Automatic Switch Box M

20 AS-BOX-M_L-IA-IEN110320 Installation Guide