SMA MLX User Manual [en, es, fr, de]

SMA Solar Technology AG

Solar Inverters

MLX Series

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

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

IMPORTANT SAFETY INSTRUCTIO...

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 installation.

WARNING

INSTALLATION For optimum safety, follow the steps described in this document. Keep in mind that the inverter has 2 voltagecarrying 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 disconnected 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.

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

IMPORTANT SAFETY INSTRUCTIO...

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.

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.

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.

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

IMPORTANT SAFETY INSTRUCTIO...

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.

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

Contents

1 Introduction

1.1 Purpose of the Manual

1.2 Unpacking

1.3 Identification of Inverter

1.4 Installation Sequence

1.5 Overview of Installation Area

2 Installation

2.1 Environment and Clearances

2.2 Mounting the Mounting Plate

2.3 Mounting the Inverter

2.4 Removing the Inverter

2.5 Access to the Installation Area

2.6 AC Grid Connection

2.7 Cable Entry

2.8 Ethernet Connections

2.9 PV Connection

2.9.1 External String Combiners 18

2.10 Closure

3 Initial Setup and Start

3.1 User Interface

3.1.1 Operation Modes 20

3.2 Display

3.2.1 Initial Setup via LCS Tool 21

3.2.2 Turn PV Load Switch On 21

3.2.3 Start-up

3.3 LCS Tool

3.3.1 Getting Started 22

4 Service

4.1 Troubleshooting

4.2 Maintenance

5 Technical Data

5.1 Specifications

5.2 Trip Settings

5.3 Conformity

5.4 Installation Conditions

5.5 Torque Specifications

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

Contents

5.6 Mains Circuit Specifications

5.7 Auxiliary Interface Specifications

5.8 Ethernet Connections

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

Introduction

1Introduction

The MLX inverters are designed to act exclusively as gridtied 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.

1 1

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

Introduction

Illustration 1.1 System Overview

1PV array 2DC combiner 3MLX inverter 4MLX Inverter Manager 5LCS Tool 6CLX portal or third party 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 communication (EU).

Inverter Manager Assembly Installation Guide, for

•

information required to commission the MLX inverter as well as setup of inverter communication (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.

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

Introduction

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 P

NOM

POC Point of Connection

STC

PV Photovoltaic, photovoltaic cells RCD Residual-Current Device RCMU Residual Current Monitoring Unit R

ISO

ROCOF Rate Of Change Of Frequency Q Q is the symbol for reactive power and is

S S is the symbol for apparent power and is

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

TT Terra Terra. AC Network

Power, Nominal conditions

The point at which the PV system is connected

to the public electricity grid.

Power, Standard Test Conditions

Insulation Resistance

measured in reactive volt-amperes (VAr).

measured in volt-amperes (VA).

Network

1 1

Table 1.2 Abbreviations

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

Introduction

1.2 Unpacking

Contents:

Inverter

•

Mounting plate

•

Accessories bag, containing:

•

6 wall plugs 8 x 50 mm

•

6 mounting screws 6 x 60 mm

•

1 M25 cable gland with sealing

•

grummet for Ethernet cables

2 x conduit bracket (2 in)

•

1 equipment grounding bolt M6 x 12

•

Installation guide, booklet format

•

Quick guide, poster format

•

1.3 Identification of Inverter

1.4 Installation Sequence

1. Pay special attention to the important safety instructions at the beginning of this manual.

2. Install the inverter according to 2.1 Environment and Clearances, 2.2 Mounting the Mounting Plate, and 2.3 Mounting the Inverter.

3. Open the inverter according to 2.5 Access to the Installation Area.

4. Install AC according to 2.6 AC Grid Connection.

5. Install Ethernet according to 2.8.1 Ethernet Connections.

6. Install PV according to 2.9 PV Connection.

7. Close the inverter according to 2.5 Access to the Installation Area.

8. Turn on AC.

9. Finalise commissioning by using the Local Commissioning and Service Tool (LCS Tool). The tool is available from the download area at www.sma.de. The hardware requirements for the LCS Tool are:

PC running WindowsTM 7 and onwards

•

150 Mb HDD

•

2 Gb RAM

•

For setup via the LCS Tool, refer to 3.3 LCS Tool.

10. Turn on PV by turning on the PV load switch.

Refer to 2.9.2 Connection of PV.

11. Verify the installation by:

Inverter display: LED ‘On’ is solid green.

•

LCS Tool: In inverter view status is ‘On

•

grid’.

12. The inverter is now in operation.

Illustration 1.3 Product Label, Example

The product label on the side of the inverter shows:

Inverter type.

•

Important specifications.

•

Serial number, located under the bar code, for

•

inverter identification.

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

Introduction

1.5 Overview of Installation Area

1 1

Illustration 1.4 Overview of Installation Area

PELV (Safe to touch)

2 Equipment grounding 7 Ethernet interface x 2 8 RS-485 interface (not in use)

Live Part

1 AC connection terminals 5 PV connection terminals

Other

3Surge Protection AC 4Surge Protection DC 6 PV load switch (optional)

Table 1.3 Overview of Installation Area

L00410644-01_2q / Rev. date: 2014-06-02 11

Installation

2 Installation

2.1 Environment and Clearances

Illustration 2.6 Mount Upright on Vertical Surface. Backwards tilt of up to 10 degrees is permitted

Illustration 2.1 Avoid Constant Stream of Water

Illustration 2.2 Avoid Direct Sunlight

Illustration 2.3 Ensure Adequate Air Flow

Illustration 2.4 Ensure Adequate Air Flow

Illustration 2.7 Prevent Dust and Ammonia Gases

NOTICE

When planning the installation site, ensure that the inverter product label and warning labels remain visible. For details, refer to 5 Technical Data.

Illustration 2.5 Mount on Non-flammable Surface

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

Installation

2.2 Mounting the Mounting Plate

Illustration 2.8 Safe Clearances

NOTICE

Ensure 620 mm / 24 in base clearance for adequate airflow.

L00410644-01_2q / Rev. date: 2014-06-02 13

Installation

Illustration 2.10 Mounting the Mounting Plate

Illustration 2.9 Mounting Plate

NOTICE

Use of the mounting plate delivered with the inverter is mandatory. If the inverter is mounted without the mounting plate, the guarantee becomes void. It is highly recommended to use all 6 mounting holes.

Mount the mounting plate:

Install in the defined environment.

•

Use screws and wall plugs that can safely carry

•

the weight of the inverter.

Ensure that the mounting plate is correctly

•

aligned.

Observe safe clearances when installing 1 or

•

more inverters, to ensure adequate airflow. Clearances are specified in Illustration 2.8 and on the mounting plate label.

Mounting multiple inverters in a single row is

•

recommended. Contact the supplier for guidelines when mounting inverters in more than 1 row.

Ensure adequate clearance at the front, for safe

•

installation and service access to the inverter.

2.3 Mounting the Inverter

CAUTION

Refer to local health and safety regulations when handling the inverter.

Procedure:

1. Lift the inverter. Locate the slots on the side of the mounting plate. Use M12 or ½ in lifting bolts and matching nuts (not part of delivery).

Illustration 2.11 Position the inverter

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

Installation

Illustration 2.12 Lifting Bolts

2. On the inverter, position the side screws against the mounting plate slots.

3. Push the inverter as shown so the side screws slide into the 2 lower slots and the 2 upper slots. See Illustration 2.13 and Illustration 2.14.

2.4 Removing the Inverter

Procedure:

1. Perform removal in the reverse order of mounting.

2. Lift the inverter.

3. Lift and slide the inverter out of the mounting plate slots.

4. Lift the inverter free of the mounting plate.

2.5 Access to the Installation Area

DANGER

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 disconnected 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.

Illustration 2.13 Slide into Slots

CAUTION

Observe ESD safety regulations. Discharge any electrostatic charge by touching the grounded enclosure, before handling any electronic component.

Procedure:

1. To open the cover, loosen the 3 lower front screws using a TX 30 screwdriver. The screws are captive screws and cannot fall out.

Lift the cover 180°. A magnet holds the cover open.

3. To close the cover, lower it into place and fasten the 3 front screws.

Illustration 2.14 Detail of Sliding into Slot

4. Check that the 4 side screws sit securely in the mounting plate slots.

5. Release the inverter.

L00410644-01_2q / Rev. date: 2014-06-02 15

Installation

Insulation Resistance Detection

The inverter has a built-in Insulation Resistance Detection / ISO circuit, which is certified according to the UL 1741 for Non-Isolated EPS Interactive PV Inverters. The Insulation Resistance Detector performs a measurement of the connected PV system resistance to ground before the inverter connects to the grid. If the resistance is below the grid code set value, the inverter will wait and re-measure the resistance after a short while. When the resistance is above the grid code set value, the inverter performs a selftest and connects to the grid.

Illustration 2.15 Loosen Front Screws and Lift Cover

2.6 AC Grid Connection

DANGER

These instructions for AC grid connection are for 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.

CAUTION

For fuse and RCD information, refer to 5 Technical Data. AC fuse rating must not exceed the ampacity of the conductors used.

NOTICE

Wiring methods used shall be in accordance with the National Electric Code, ANSI/NFPA 70, and the Canadian Electrical Code, Part I. Always observe local regulations. All installers must observe the relevant wiring methods.

IMI Detection

The inverter has built-in IMI/RCMU (Insulation Monitoring Interrupter / Residual Current Monitoring Unit). Certification is according to the UL 1741 for Non-Isolated EPS Interactive PV Inverters. The IMI/RCMU circuit is 100% single fault immune. It acts on a continuous ground fault current and a sudden change in the ground fault current. This functionality is running during normal operation.

Illustration 2.16 Installation Area

Illustration 2.17 AC Cable Wire Strip

The MLX inverter must only be connected to a 3-phase grid.

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

Installation

On the AC cable, strip insulation on all 4 wires. The protective earth wire (PE) must be longer than the mains wires. See Illustration 2.17.

1. Verify that the inverter rating matches the grid.

2. Ensure that main circuit breaker is released, and take precautions to prevent connection.

3. Open the front cover.

4. Insert the cable through the AC gland to the terminal blocks.

5. Connect the 3 mains wires (L1, L2, L3) and the PE wire to the terminal block with the respective markings. The PE wire is marked with the symbol shown in Illustration 2.18.

6. Optional: Make an extra PE connection at the secondary PE earthing points using the external equipment grounding bolt delivered with the inverter. See Illustration 5.2.

7. All wires must be properly fastened with the correct torque. See 5.5 Torque Specifications.

2.7 Cable Entry

Options for cable entry

Cable glands (premounted), or

•

2-inch conduit adapters (supplied in accessories

•

bag)

If changing to the 2-inch conduit adapters, ensure to tighten the screws in the order shown in Illustration 2.19 and Illustration 2.20. First tighten all screws with 0.75 Nm (6.5 in-lbf) and then 1.5 Nm (13 in-lbf).

Illustration 2.19 AC Mounting Bracket

Illustration 2.18 Protective Earth Symbol

Terminal AC

Table 2.1 Acceptable Conductor Sizes

Always observe current capacity of cables used.

Range

16-95 mm 6-4/0 AWG

Max. conductor temperature rating Conductor material Cable jacket diameter with supplied cable gland

90 ºC Al/Cu 37-44 mm

90 ºC Al/Cu 14-21 mm

2.8 Ethernet Connections

Before connecting Ethernet cables, refer to the requirements in 5.8 Ethernet Connections.

Illustration 2.20 DC Mounting Bracket

Procedure:

1. Do not remove the RJ-45 connector on the Ethernet cable.

2. Run the cables through the base of the inverter via cable glands. See Illustration 2.21.

3. Cut slice in rubber grummet. Place the grummet in the gland to ensure proper seal.

4. Plug into the Ethernet connector.

L00410644-01_2q / Rev. date: 2014-06-02 17

Installation

5. Fasten cables with cable ties to ensure a durable

connection over time. See Illustration 2.22.

Illustration 2.21 Run Cables Through Cable Glands

CAUTION

PV array is floating, with both the (+) and (-) conductors connected to the inverters' PV inputs. Neither conductor is to be connected to earth.

A DC load switch on either the DC combiner or inverter (optional) for safe disconnect of DC power to inverter is required.

CAUTION

Do NOT connect PV to earth!

Illustration 2.22 Fasten with Cable Ties

2.9 PV Connection

2.9.1 External String Combiners

PV strings must be connected to the DC input via an external string combiner. The purpose of the string combiner is to combine the PV strings from the PV array and secure the individual strings against overcurrent.

NOTICE

It is essential that all PV strings connected to the DC combiner are even in number and type of modules and tilt and orientation.

NOTICE

Observe correct fuse rating. Consult module manufacturers' manuals for information on correct string fuse rating.

Use a suitable voltmeter that can measure up to 1000 V DC. Verify the polarity and maximum voltage of the PV arrays by measuring the PV open-circuit voltage. The inverter is protected against reversed polarity and will not generate power until the polarity is correct.

Illustration 2.23 Do Not Connect PV to Earth

The combined output from the DC combiner must be connected to the DC input of the MLX inverter.

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

Installation

Illustration 2.26 DC Label

2.10 Closure

Illustration 2.24 DC Connection Area

1. On the inverter or string combiner turn the PV load switch into off position.

2. Connect the PV cables from the external string combiner to the inverter. Ensure correct polarity, see Illustration 2.25.

3. All wires must be properly fastened with the correct torque. See 5.5 Torque Specifications.

Illustration 2.25 Connect to PV Input

1. Close the cover of the inverter installation area.

Fasten the 3 front screws. See 5.5 Torque Specifi- cations.

2. Turn on AC power.

L00410644-01_2q / Rev. date: 2014-06-02 19

Initial Setup and Start

3 Initial Setup and Start

3.1 User Interface

The user interface comprises:

Local display, for all inverter variants. The local

•

display enables read-only status information of the inverter. It is not possible to configure or set up the MLX inverter via the display. The ‘#’ in the display explains the operation modes.

Local Commissioning and Service Tool (LCS Tool).

•

The LCS Tool enables configuration of 1 or multiple MLX inverters.

3.1.1 Operation Modes

The inverter has 5 operation modes, indicated by LEDs.

Status LEDs

Green

Off grid

Connecting

On grid

Internal inverter event

Fail safe

- - - - - - - - - - - - - - - - -

Red

- - - - - - - - - - - - - - - - -

Green

▬██▬██▬██▬██▬██▬

Red

- - - - - - - - - - - - - - - - -

Green

Red Green

Red Green Red

██████████████████

▬

- - - - - - - - - - - - - - - - -

▬██▬██▬██▬██▬██▬

- - - - - - - - - - - - - - - - -

▬██▬██▬██▬██▬██▬

▬

On grid (Green LED on)

#60. The inverter is connected to the grid and energises the grid. The inverter disconnects when:

it detects abnormal grid conditions (dependent

•

on grid code), or

an internal event occurs, or

•

PV power is insufficient (no power is supplied to

•

the grid for 10 minutes).

The inverter then enters connecting mode or off grid mode.

Internal Inverter Event (Green LED flashing) #54. The inverter is waiting for an internal condition to be within limits (for example a too high temperature) before it will go back on grid.

Fail Safe (Red LED flashing) #70. If the inverter detects an error in its circuits during the selftest (in connecting mode) or during operation, the inverter goes into fail safe mode, disconnecting from grid. The inverter will remain in fail safe mode until power has been absent for a minimum of 10 minutes, or the inverter has been shut down completely (AC+PV).

3.2 Display

Table 3.1 Operation Modes

Off grid (standby) (LEDs off)

#0-51. When no power has been delivered to the AC grid for more than 10 minutes, the inverter disconnects from the grid and shuts down. User and communication interfaces remain powered for communication purposes.

Connecting (Green LED flashing) #52-53. The inverter starts up when the PV input voltage reaches the minimum DC feed-in voltage. The inverter performs a series of internal self-tests, including measurement of the resistance between the PV arrays and earth. Meanwhile, it also monitors the grid parameters. When the grid parameters have been within the specifications for the required amount of time (depends on grid code), the inverter starts to energise the grid.

NOTICE

It can take up to 10 sec. until the display activates, after power up.

The integrated display on the inverter front gives the user access to information about the PV system and the inverter.

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Initial Setup and Start

Illustration 3.1 Overview of Display Buttons and Functionality

Key Function

Adjust contrast level of display. Use

F2 F3 F4 Home OK Arrow Up Arrow Down Arrow Right Arrow Left Back On - Green LED Alarm - Red LED

arrow up/down button while holding down the F1 button.

Not in use

Return to main screen Not in use A step up A step down Toggles screen right Toggles screen left Return to main screen

IP address

•

Inverter Manager MAC address

•

Inverter software version

•

Actual values. This section contains:

PV voltage and current

•

Phase-to-phase voltages

•

Phase currents

•

Grid frequency

•

3.2.1 Initial Setup via LCS Tool

The LCS Tool makes it possible to chose from a list of predefined settings for different grids. All grid-specific limits must be configured using the LCS Tool. After installation, check all cables and close the inverter. Turn on AC power.

WARNING

Correct selection of grid code is essential to comply with local and national standards.

3.2.2 Turn PV Load Switch On

Table 3.2 Overview of Display Buttons and Functionality

The screen structure is divided into 3 sections:

Main screen. Current and daily production. This section contains:

Actual power output (kW)

•

Energy counter current day (kWh)

•

Total energy counter (kWh)

•

Current date

•

Current time

•

Operation mode (#)

•

Inverter information. This section contains:

Inverter type

•

Inverter name

•

Serial no.

•

L00410644-01_2q / Rev. date: 2014-06-02 21

Illustration 3.2 PV Load Switch

Turn PV load switch on, either via inverter or string combiner.

3.2.3 Start-up

The inverter starts automatically if sufficient solar irradiation is available. The start-up takes a few minutes. During this period, the inverter performs a self-test procedure.

NOTICE

The inverter is protected against reversed polarity. The inverter does not generate power until any reversed polarity is corrected.

Initial Setup and Start

3.3 LCS Tool

The MLX inverters and Inverter Managers must be commissioned via the Local Commissioning and Service Tool (LCS Tool). Commissioning is required before the MLX inverters can connect to the AC grid and start to convert power.

The LCS Tool is available from the download area at www.sma.de.

The hardware requirements for the LCS Tool are:

PC running WindowsTM 7 and onwards

•

150 Mb HDD

•

2 Gb RAM

•

The LCS Tool must be installed on a local PC drive. The PC must be connected to the Inverter Manager’s LAN 1 port via Ethernet.

NOTICE

The Inverter Manager must have an IP address assigned by a DHCP server on the LAN 1 port. It is important that the PC running the LCS Tool is connected to the same IP subnet as the Inverter Manager. Port LAN 2 is intended for MLX inverters exclusively.

Illustration 3.3 Commissioning of Inverters Using LCS Tool

1 LCS Tool 2Router/DHCP 3MLX Inverter Manager 4MLX inverter 5LAN 2 6LAN 1

3.3.1 Getting Started

1. Start up the LCS Tool. The tool displays a list of all identified Inverter Managers. It can take

several minutes before the LCS Tool has identified all Inverter Managers.

2. The screen now shows a list of all Inverter

Managers (see Illustration 3.4). To start the wizard, click the Inverter Manager to be configured. By clicking the Inverter Manager, the inverter(s) discovered by the Inverter Manager are displayed. Uncommissioned inverters (no grid code assigned) are presented with a blue square together with their software version.

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Initial Setup and Start

Illustration 3.4 LCS Tool - Initial Screen

3. Verify that date and time are correct. If not, set date and time and continue. See Illustration 3.5.

Illustration 3.5 LCS Tool - Verify Date and Time

4. A list of inverters identified by the selected Inverter Manager is shown. See Illustration 3.6. Verify that the list of inverters is complete. Verify that all inverters are present. It is possible to continue the configuration of the listed

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inverters even if not all inverters are discovered. The undiscovered inverters can always be configured later.

Initial Setup and Start

Illustration 3.6 LCS Tool - List of Connected Inverters

5. Select the desired country from the list of options available for the inverters in the network. See Illustration 3.7.

6. Select the desired grid code from the list of options available for the selected country. If

needed, load a custom grid code by clicking the ‘Load’ button. See Illustration 3.7. The ‘Create’ button is inactive and cannot be used.

Illustration 3.7 LCS Tool - Select Country and Grid Code

7. The LCS Tool prompts for a confirmation of the selected country and grid code. See

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

Illustration 3.8. Incorrect configuration can be changed using the ‘Back’ button and changing the settings in the previous windows.

Initial Setup and Start

Illustration 3.8 LCS Tool - Verification of Country and Grid Code

8. The system now applies the selected grid code to the Inverter Manager and the discovered inverters. Any inverter added at a later stage automatically inherits the same grid code. Only 1 grid code per Inverter Manager is possible.

NOTICE

It is essential to choose the correct grid code. The grid code cannot be changed afterwards without contacting SMA.

9. A green square identifies the commissioned inverters. However, the inverters do not connect to grid before a ‘Start’ command is issued from the bar below the top menu. See Illustration 3.9.

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Initial Setup and Start

Illustration 3.9 LCS Tool - List of all Inverters Connected to the Inverter Manager

10. If sufficient PV power is present and the grid code conditions are met, the inverters connect to the grid.

11. Upon commissioning, it is possible to download a commissioning report under the menu ‘Reports’.

The report contains all information about inverter settings, including actual disconnect values for each inverter. See Illustration 3.10.

Illustration 3.10 LCS Tool - Commissioning Report

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Initial Setup and Start

NOTICE

If the desired grid code is not available, or if the LCS Tool warns about incompatible software versions, the grid code and software library must be updated on the LCS Tool.

For utility-interactive inverters, field adjustable trip limits and trip times can be altered from default settings. See

5.2 Trip Settings. After user registration and authorisation, authorised service personnel can generate new grid code settings at www.sma.de. The new grid code settings can be downloaded as a file and applied to the MLX inverters via the LCS Tool. These grid code files are encoded and can only be used for the particular installation.

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Service

4Service

4.1 Troubleshooting

The information is organised in tables showing messages appearing in the LCS Tool, known as events. The tables contain descriptions of events as well as explanations of which actions to take when an event occurs.

Event Type ID Display Description Action DNO Hotline PV

Indicates whether the event relates to grid, PV, internal or fail safe issues. The specific event ID. Text shown in display. Description of the event. Description of which action to take prior to contacting any other parties. If the prescribed action has not identified the malfunction, contact the DNO for further assistance. If the prescribed action has not identified the malfunction, contact the inverter hotline for further assistance. If the prescribed action has not identified the malfunction, contact the PV supplier for further assistance.

Grid-related Events

ID Status

Description Action DNO Hotline PV

message

1–6 Grid voltage too low. Check voltage and AC installation. If the voltage is

zero, check the fuses.

7–9 Grid voltage average over 10 minutes

too high.

10–15 Grid voltage too high. Check voltage and AC installation. x - 16–18 The inverter has detected a voltage peak

on the grid. 19, 22 Grid frequency too low or too high. Check grid frequency. x - 31–33 DC grid current too high. For repeated daily occurrences, perform onsite grid

34–37 Residual Current Monitoring Unit (RCMU)

has measured an excessive current.

40 AC grid notOKThe AC grid has been out of range for

more than 10 minutes (frequency and/or

voltage). 41–43 Fault ride through. The inverter has

detected that grid voltage was below or

above a certain level. 48, 51 Grid frequency too low or too high. Check grid frequency and AC installation. x - 54–56 DC grid current too high (stage 2). For repeated daily occurrences, perform onsite grid

61 Loss of mains, open phase detected. If the event reoccurs several times each day, contact

62 Loss of mains. If the event reoccurs several times each day, contact

Check that the installation is correct according to the installation guide. If so, increase the mean voltage limit according to 3.3.1 Getting Started.

Check voltage and AC installation. x - -

analysis. Turn both DC and AC off and wait until the display turns off. Then turn on DC and AC and observe if the event reoccurs. Visual inspection of all PV cables and modules. Check grid frequency, grid voltage, SW version, and grid code setting.

If this event is reported several times each day, perform onsite grid analysis.

analysis.

the DNO.

x- -

-x -

x- -

Table 4.1 Grid-related Events

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Service

PV-related Events

ID Status

Description Action DNO Hotline PV

message

103 PV current is too

high/waiting

115,

PV ISO too low The resistance between ground and PV

260

258 PV voltage too

high/waiting

278 DC voltage high warning. Check that PV installation and layout correspond

Table 4.2 PV-related Events

Too many PV modules connected in parallel. Should only appear on newly installed systems.

is too low for the inverter to start up. This will force the inverter to make a new measurement after 10 minutes. DC voltage is too high. Check that PV installation and layout correspond

Check number of strings in parallel and current ratings. Has the current limit been exceeded? Reconnect strings in parallel. Make a visual inspection of all PV cables and modules for correct installation according to the installation guide. The event could indicate that the PE connection is missing.

to recommendations in the manuals.

-x x

Internal Events

ID Status

Description Action DNO Hotline PV

message

201–208 The internal temperature of the inverter is

too high.

209, 210 Voltage on DC bus is too high. If event persists, reset the inverter by discon-

211 Fan rpm low Fan speed is too low. Check if the inverter fan is blocked. - x 213–215 Internal error. Voltage measured before and

after the relay differs too much. 216–218 Current measured on AC side is too high. Call service. - x 219–221 Internal error. Voltage measured before and

after the relay differs too much. 225–240, 275 241, 242, 245, 249 248 Internal CPU error. Restart the inverter. If event persists, call

252–254 Current measured on AC side is too high. If the event is repeated, call service. - x 243, 263 Internal error. Restart the inverter. If event persists, call

279 Temperature sensor error. If the event is repeated, call service. - x 280 Self-test 24-hour timeout. Self-test must run

281 Too many RCMU events during the past 24

282 Grid code settings invalid. Restart the inverter. If event persists,

283 Gatedrive error. Restart the inverter. If event persists, call

Failure in memory/EEPROM. Restart the inverter. If event persists, call

Internal communication error. Restart the inverter. If event persists, call

at least once per 24 hours.

hours.

Only 4 automatic reconnect attempts after

event 34 is allowed during a 24-hour period.

The inverter will automatically try to

reconnect after a certain period.

Check that the inverter is not covered and that the ventilation duct is not blocked.

necting DC and AC, using the switches. If the event is repeated, check the maximum PV voltage using the display to see if it is above the limits.

Call service. - x -

service.

None. - - -

Wait up to 24 hours. If event 34 also occurs, follow the action for event 34.

reconfigure the grid code settings.

service.

-x -

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