SMA MLX Series User manual

www.SMA.de

Solar Inverters

MLX Series

Installation Guide / Guía de instalacíon / Guide d’installation /

Installationsanleitung

SMA Solar Technology AG

Choice of Language - Selección de idioma - Choix de la langue - Sprachauswahl

Page 5 English UK

Página 40 Español

Page 78 Français

Seite 116 Deutsch

L00410644-01_2q / Rev. date: 2014-06-02 1

IMPORTANT SAFETY INSTRUCTIONS - SAVE THESE INSTRUCTIONS

Safety Message Types

The following symbols are used in this document:

DANGER

Indicates a potentially hazardous situation which will

result in death or serious injury.

WARNING

Indicates a potentially hazardous situation which could

result in death or serious injury.

CAUTION

Indicates a potentially hazardous situation which could

result in minor or moderate injury. It may also be used

to alert against unsafe practices.

NOTICE

Indicates important information, including situations

which may result in damage to equipment or property.

General Safety

CAUTION

This manual contains important instructions that shall be

followed during installation and maintenance of the MLX

inverter.

NOTICE

BEFORE INSTALLATION

Check for damage to equipment and packaging. If in

doubt, contact the supplier before commencing instal-

lation.

WARNING

INSTALLATION

For optimum safety, follow the steps described in this

document. Keep in mind that the inverter has 2 voltage-

carrying sides; the PV input and the AC grid.

DANGER

DISCONNECTING THE INVERTER

Before starting work on the inverter, switch off AC at the

mains switch and PV using the PV load switch. Ensure

that the inverter cannot be unintentionally reconnected.

Use a voltage tester to ensure that the unit is discon-

nected and voltage free. The inverter can still be charged

with very high voltage at hazardous levels even when it

is disconnected from AC grid and solar modules. Wait at

least 5 minutes following disconnection from grid and

PV panels before proceeding.

IMPORTANT SAFETY INSTRUCTIO...

L00410644-01_2q / Rev. date: 2014-06-02

1 PV load switch (optional)

Illustration 1.1

NOTICE

The PV load switch can be secured in the ‘Off’ position

using a padlock.

CAUTION

DC voltages up to 1000 V are present in a PV system

even when the inverter is disconnected from the AC grid.

Faults or inappropriate use may lead to electric arcing.

CAUTION

MAINTENANCE AND MODIFICATION

Only authorised personnel are permitted to modify the

inverter. To ensure personal safety, use only original

spare parts available from the supplier. If non-original

spare parts are used, compliance with CE/UL guidelines

in respect of electrical safety, EMC, and machine safety is

not guaranteed.

WARNING

INSTALLER

Observe the National Electric Code, ANSI/NFPA 70.

Input and output circuits are isolated from the enclosure.

System grounding is the responsibility of the installer.

WARNING

RISK OF ELECTRIC SHOCK

These servicing instructions are for use by qualified

personnel only. To reduce the risk of electric shock, do

not perform any servicing other than that specified in

the operating instructions unless you are qualified to do

so.

WARNING

The inverter is not equipped with an isolation

transformer and is intended to be installed according to

NFPA 70, 690.35 with an ungrounded (floating) PV array.

WARNING

Input and output circuits are isolated from the enclosure.

System grounding, when required by the Canadian

Electrical Code, Part I, is the responsibility of the

installer.

CAUTION

All persons installing and servicing inverters must be:

•

Trained and authorised in general safety rules

for work on electrical equipment.

•

Familiar with local requirements, rules, and

regulations for the installation.

CAUTION

The inverter does not provide overcurrent protection.

This must be provided by the installer. See Table 5.8.

CAUTION

The temperature of the cooling racks and components

inside the inverter can exceed 70 °C/158 °F. Observe the

danger of burn injury.

The inverter is to be installed so that it is not expected

to be contacted by persons.

CAUTION

To reduce the risk of fire, connect only to a circuit

provided with 125 A maximum branch-circuit

overcurrent protection in accordance with the National

Electrical Code, ANSI/NFPA 70.

NOTICE

Use 75 °C or 90 °C wire, either AWG copper or AWG

aluminium. See 2.7 Cable Entry.

IMPORTANT SAFETY INSTRUCTIO...

L00410644-01_2q / Rev. date: 2014-06-02

NOTICE

The symbol for protective earth used in this manual is

identified in Illustration 2.18.

The on/off symbol is identified in 3.2.2 Turn PV Load

Switch On.

NOTICE

For information about ambient temperature rating, see

5.4 Installation Conditions.

NOTICE

This manual contains information about field wiring

connections and torque specifications. See 5.5 Torque

Specifications.

NOTICE

This equipment has been tested and found to comply

with the limits for a Class B digital device, pursuant to

part 15 of the FCC Rules. These limits are designed to

provide reasonable protection against harmful

interference in a residential installation. This equipment

generates, uses and can radiate radio frequency energy

and, if not installed and used in accordance with the

instructions, may cause harmful interference to radio

communications. However, there is no guarantee that

interference will not occur in a particular installation. If

this equipment does cause harmful interference to radio

or television reception, which can be determined by

turning the equipment off and on, the user is

encouraged to try to correct the interference by 1 or

more of the following measures:

•

Reorient or relocate the receiving antenna.

•

Increase the distance between the equipment

and receiver.

•

Connect the equipment into an outlet on a

circuit different from that to which the receiver

is connected.

•

Consult the dealer or an experienced radio/TV

technician for help.

Conformity

Go to the download area at www.sma.de for information.

See also 5 Technical Data.

IMPORTANT SAFETY INSTRUCTIO...

L00410644-01_2q / Rev. date: 2014-06-02

Contents

1 Introduction

1.1 Purpose of the Manual 8

1.2 Unpacking 10

1.3 Identification of Inverter 10

1.4 Installation Sequence 10

1.5 Overview of Installation Area 11

2 Installation

2.1 Environment and Clearances 12

2.2 Mounting the Mounting Plate 13

2.3 Mounting the Inverter 14

2.4 Removing the Inverter 15

2.5 Access to the Installation Area 15

2.6 AC Grid Connection 16

2.7 Cable Entry 17

2.8 Ethernet Connections 17

2.9 PV Connection 18

2.9.1 External String Combiners 18

2.10 Closure 19

3 Initial Setup and Start

3.1 User Interface 20

3.1.1 Operation Modes 20

3.2 Display 20

3.2.1 Initial Setup via LCS Tool 21

3.2.2 Turn PV Load Switch On 21

3.2.3 Start-up 21

3.3 LCS Tool 22

3.3.1 Getting Started 22

4 Service

4.1 Troubleshooting 28

4.2 Maintenance 30

5 Technical Data

5.1 Specifications 31

5.2 Trip Settings 32

5.3 Conformity 33

5.4 Installation Conditions 34

5.5 Torque Specifications 34

Contents

L00410644-01_2q / Rev. date: 2014-06-02 5

5.6 Mains Circuit Specifications 35

5.7 Auxiliary Interface Specifications 35

5.8 Ethernet Connections 36

Contents

6 L00410644-01_2q / Rev. date: 2014-06-02

1Introduction

The MLX inverters are designed to act exclusively as grid-

tied inverters for photovoltaic (PV) systems. The inverter

converts DC voltage generated by a solar array into

electrical AC power. The unit must be tied to the utility

grid and a photovoltaic system in order to operate

properly. It is not suitable for any other applications (such

as a battery back-up or wind-powered systems).

The MLX system consists of 4 main components (see also

Illustration 1.1):

•

MLX inverter.

•

DC combiner.

The DC combiner makes it possible to combine

the needed number of PV strings for the MLX

inverter. A DC combiner is needed for each MLX

inverter.

•

MLX Inverter Manager.

The MLX Inverter Manager is required for

operating the MLX inverters. Each Inverter

Manager can handle up to 42 inverters. The

Inverter Manager handles all communication to

the inverters. It forms a single point of interface

for data accusation systems, upload to cloud

services and power-plant control.

•

LCS Tool.

The LCS Tool is required for commissioning and

servicing MLX inverters, via the Inverter Manager.

The LCS Tool acts as the primary user interface

for the MLX system.

Introduction

L00410644-01_2q / Rev. date: 2014-06-02 7

Illustration 1.1 System Overview

1PVarray

2DCcombiner

3MLXinverter

4MLXInverterManager

5LCSTool

6CLXportalorthirdparty

7 Utility control

8 SCADA system

9Transformer

Table 1.1 System Overview

1.1 Purpose of the Manual

The Installation Guide provides information required to

install and commission the MLX series inverter.

Additional resources available:

•

Inverter Manager Installation Poster, for

information required to commission the MLX

inverter as well as setup of inverter communi-

cation (EU).

•

Inverter Manager Assembly Installation Guide, for

information required to commission the MLX

inverter as well as setup of inverter communi-

cation (US).

•

Design Guide, for information required for detailed

inverter layout planning in a diversity of solar

energy applications.

•

Fan Installation Instruction, for information

required to replace a fan.

•

SPD Installation Instruction, for information

required to replace surge protection devices.

These documents are available from the download area at

www.sma.de, or from the supplier of the solar inverter.

Introduction

8 L00410644-01_2q / Rev. date: 2014-06-02

Illustration 1.2 MLX Inverter

Abbreviation Description

ANSI American National Standards Institute

AWG American Wire Gauge

cat5e Category 5 twisted pair cable (enhanced)

DHCP Dynamic Host Configuration Protocol

DNO Distribution Network Operator

DSL Digital Subscriber Line

EMC (Directive) Electromagnetic Compatibility Directive

ESD Electrostatic Discharge

FCC Federal Communications Commission

FRT Fault Ride Through

GSM Global System for Mobile Communications

HDD Hard Disk Drive

IEC International Electrotechnical Commission

IT Isolated Terra

LCS Local Commissioning and Service

LED Light-Emitting Diode

LVD (Directive) Low Voltage Directive

MCB Miniature Circuit Breaker

MPP Maximum Power Point

MPPT Maximum Power Point Tracking

NFPA National Fire Protection Association

P P is the symbol for active power and is

measured in Watts (W).

PCB Printed Circuit Board

PCC Point of Common Coupling

The point on the public electricity network to

which other customers are, or could be,

connected.

PE Protective Earth

PELV Protected Extra-Low Voltage

PLA Power Level Adjustment

NOM

Power, Nominal conditions

POC Point of Connection

The point at which the PV system is connected

to the public electricity grid.

STC

Power, Standard Test Conditions

PV Photovoltaic, photovoltaic cells

RCD Residual-Current Device

RCMU Residual Current Monitoring Unit

ISO

Insulation Resistance

ROCOF Rate Of Change Of Frequency

Q Q is the symbol for reactive power and is

measured in reactive volt-amperes (VAr).

S S is the symbol for apparent power and is

measured in volt-amperes (VA).

STC Standard Test Conditions

SW Software

THD Total Harmonic Distortion

TN-S Terra Neutral - Separate. AC Network

TN-C Terra Neutral - Combined. AC Network

TN-C-S Terra Neutral - Combined - Separate. AC

Network

TT Terra Terra. AC Network

Table 1.2 Abbreviations

Introduction

L00410644-01_2q / Rev. date: 2014-06-02 9

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