Delta AU Series Specification sheet

Operation and Installation Manual for AU Series
M5-TL
M4-TL
M3-TL
AU

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This manual is subject to change.
Please check our website at http://www.delta-americas.com/SolarInverters.aspx
for the most up-to-date manual version.
© Copyright –DELTA ELECTRONICS (SHANGHAI) CO.,LTD. - All rights reserved.
This manual accompanies our equipment for use by the end users. The technical instructions and illustrations contained in this ma-
nual are to be treated as confidential and no part may be reproduced without the prior written permission of DELTA ELECTRONICS
(SHANGHAI) CO.,LTD. Service engineers and end users may not divulge the information contained herein or use this manual for
purposes other than those strictly connected with correct use of the equipment. All information and specifications are subject to
change without notice.

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Table of Contents
1 General safety information 4
1.1 Safety and Advisory symbols 5
1.2 Safety Instructions 6
2 Introduction 7
2.1 System 8
2.2 Data evaluation and communication 8
2.3 Technical structure of the solar inverter 9
2.4 Ambient temperature 10
2.5 Solar inverter PV input DC voltage range 10
2.6 Efficiency 11
2.7 Equipment overview 11
2.8 Inverter type and safety labels 12
3 Installation 15
3.1 Visual inspection 17
3.2 Installation Infomation 17
3.3 Mounting the inverter 18
3.4 Electrical connection 20
3.5 Mounting the inverter 21
4 Electrical connections 22
4.1 General safety 22
4.2 AC vgrid connection 23
4.3 External DC switch 23
4.4 AC circuit breaker requirements 24
4.5 Grounding conductor 24
4.6 Lightning and surge protection 24
4.7 Multiple inverters 24
4.8 PV string considerations 24
4.9 Inverter connections 25
4.9.1 General information 25
4.9.2 PV array string input information 28
4.9.3 Inverter AC output wire connections 30
5 Commissioning the PV system 30
5.1 Status LEDs 31
5.2 LED Indication 31

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5.2.1 Introduction 31
5.2.2 LED Message 31
5.3 Inverter turn-on procedure 32
5.4 Inverter turn-off procedure
5.3 M Series APP(Android) Manual 32
5.3.1 Introduction 32
5.3.2 Installation 32
5.3.3 Connection 33
5.3.4 Menu Structure 33
5.3.5 Functions 35
6 Production information 43
7 Repair 44
8 Decommissioning, transport, storage, disposal 44
8.1 Decommissioning 45
8.2 Packaging 45
8.3 Transport 46
8.4 Storage 46
8.5 Dispose 46
9 Certificate and technical data 46
9.1 Certificate 46
9.2 Technical data 46
10 Warranty 51
11 Glossary 52

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IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
1 General safety information
2 This manual contains important instructions for Delta’s M series inverters that should be followed
during installation and maintenance of the inverter. To reduce the risk of electrical shock, and to
ensure the safe installation and operation of the Delta M series inverter, follow these instructions.
3
4 Delta models M3-TL, M4-TL and M5-TL inverters are designed and tested to meet all applicable
AS/NZS and International safety standards. However, like all electrical and electronic equipment,
safety precautions must be observed and followed during installation and operation of the Delta M
series inverters to reduce the risk of personal injury and to ensure a safe installation.
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6 Installation, commissioning, service, and maintenance of Delta models M3-TL, M4-TL and M5-TL
inverters must only be performed by qualified personnel that are licensed and/or satisfy state and
local jurisdiction regulations.
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8 Before starting installation or commissioning of the Delta models M3-TL, M4-TL and M5-TL, read
through the entire manual and note all DANGER! WARNING! CAUTION! and NOTICE! statements.
9 All AS electrical installations must comply and be in accordance with all the state, local, utility
regulations, and all applicable standard.

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1.1 Safety and Advisory symbols
DANGER DANGER indicates a hazardous situation which, if not avoided, will result in
death or serious injury.
WARNING WARNING indicates a hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION CAUTION indicates a hazardous situation which, if not avoided, could result in
minor or moderate injury.
NOTICE NOTICE indicates a situation that can result in property damage if not avoided.
HIGH VOLTAGE WARNING!
Indicates hazardous high
voltages are present, which, if
not avoided, will result in death
or serious injury. Thus, only
authorized and trained
personnel should install and/or
maintain this product.
Hot surface
Equipment grounding
conductor
Wait for a prescribed amount
of time before engaging in the
indicated action.

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1.2 Safety Instructions
The inverter installation must be performed by an authorized electrician in accordance with the local
and SAI Global AS/NZS 5033:2014.
CAUTION- Risk of Electric Shock. When the PV array is exposed to light, it supplies a DC
voltage to this equipment.
CAUTION - Risk of Electric Shock. Do not remove cover. No user serviceable parts inside.
Refer servicing to qualified service personnel.
CAUTION - Risk of electric shock from energy stored in capacitor. Do not remove cover until 5
minutes after disconnecting all sources of supply.
WARNING - For continuous protection against risk of fire, replace only with same type and
ratings of fuse.
WARNING - The RSD Combiner surfaces may become hot. To reduce the risk of burns, do not
touch them.
CAUTION - Electrical installation and final application in Australian market shall consider the
requirements in AS/NZS 3000, AS/NZS 4777.1 and AS/NZS 5033.
CAUTION - Although DC switch may be integrated in product already, external DC switches
fulfill latest AS 60947.3 have to be installed out of the inverter in way per AS/NZS 5033.
CAUTION - DRM function is carried out by external ancillary equipment eShow, please connect
the equipment according to instruction strictly before use.

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2 Introduction
With this device you have acquired a solar inverter for connection of photovoltaic systems to the
grid. This solar inverter is characterized by an advanced housing design and state-of-the-art high-
frequency technology, which enable the highest levels of efficiency.
The solar inverter includes series monitoring units, such as anti-islanding protection, display,
RS485 (EIA485) interfaces.
The inverter is usable indoor and outdoor. It fulfills the directives of AS/NZS 5033,AS/NZS 4777,
AS/NZS 4417, AS/NZS 3000 and IEC 62109 for parallel operation of power generation plants on
low-voltage network of regional electrical utility companies.
.
The function of the anti-islanding protection (automatic isolation point for in-plant generation sys-
tems) stipulates compliance with the specifications of AS/NZS 4777 and IEC 62109.2.
In the following technical description, the precise functions are explained to the installer, as well
as the user, which are required for the installation, operational start-up and handling of the solar
inverter.
The inverter not only meets the safety requirements of AS/NZS 5033, but also complies with
the specifications of AS/NZS 4777 for Grid Support Utility Interactive Inverters that support a
more stable utility grid. Delta M TL series were testing to the AS/NZS 4777.2 and AS/NZS 4417
for Regulatory Compliance Mark.
In the following technical description, the precise functions are explained to the installer, as well
as the user, which are required for the installation, operational start-up and handling of the
solar inverter.

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2.1 System
The content of renewable energy with respect to overall power consumption worldwide is increas-
ing annually by approximately 25%. The reason for this rise can be primarily attributed to the con-
stantly increasing demand for power, the increasing interest in environmentally friendly technolo-
gies, as well as the increasing costs of non-renewable energy.
By the use of renewable energy sources, the earth‘s atmosphere can be enormously relieved of
increases in CO2 and other harmful gases which result from power generation.
The solar inverter converts direct current from the solar cells into alternating current. This enables
you to feed your self-produced solar energy into the public grid.
Thanks to efficient MPP tracking, maximum capacity utilization of the solar energy plant is en-
sured even in cases of misty and cloudy skies.
The string concept means that PV modules are always connected in series (in a string) and/or
that strings with the same voltage are connected in parallel to the solar inverter with the aim of
significantly reducing the photovoltaic system’s cabling requirements.
The fact that the modules are connected in strings also means that the photovoltaic system can be
perfectly matched to the solar inverter’s input voltage range.
The inverter is transformer less type without galvanic isolation. Therefore, the inverter may only
be operated with ungrounded PV arrays. Furthermore, the PV array must be installed in
accordance with the AS/NZS 5033(Ungrounded Photovoltaic Power Systems) and the locally valid
regulations for ungrounded PV arrays. Additionally, the PV array (PV modules and cabling) must
have protective insulation and the PV modules used must be suitable for use with this inverter.
PV modules with a high capacity to ground may only be used if their coupling capacity does not
excessed 1,200 nF with 50Hz grid.
2.2 Data evaluation and communication
The integrated interface, processing and communication of the device enables easy operation of
the solar inverter. Monitoring of the operational status and signaling of operational failures are capa-
ble of being called up over the interface. The data interfaces enable the downloading of data which
can be evaluated with the aid of a PC system and allow continuous recording of operating data.
The best way of accessing this functionality is via a monitoring system connected to your inverter.
The read-out of the data over the integrated interface (RS485, BLE4.0, WIFI) is possible only
in solar operation.

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2.3 Technical structure of the solar inverter
The photovoltaic voltage is adjusted so that the maximum power output of the PV modules is also
achieved with different solar irradiation levels and temperatures (MPP-Tracking). These inverters
have quite wide MPP range of suit for variety of PV modules by a variety of manufacturers. Mea-
sures must be taken to ensure that the maximum no-load voltage of 600 V is never exceeded.
Please note that the maximum no-load voltage will occur at the lowest temperatures anticipated.
You will find more detailed information about temperature dependency in the data sheet for the PV
modules.
The high-quality aluminum casing corresponds to protection degree IP65 and is
protected by an anti-corrosion finish. The heat sink on the M series inverters
is designed in such a way that operation of the inverter is possible at ambient temperatures from
-22°F to +140°F (-30°C to +60°C) at full power and optimal efficiency for 230 Vac
AC grids.
Metal fins designed into the rear side of the inverter chassis are used to dissipate heat and protect
the unit. An internal temperature control protects the interior of the device. In case of high ambient
temperatures, the maximum transferable power is limited.
The solar inverter is controlled by microcontrollers which provide interface communication and the
values and messages on the front-panel display.
Operator protection requirements are met by electrically isolating the grid from the PV module. The
electrical isolation between the grid and the PV module is equivalent to basic insulation. Maximum
operator protection is ensured by reinforced isolation between the grid, PV modules and accessible
interfaces (display, RS485 interface ). Relevant standards concerning electromagnetic compatibility
(EMC) and safety are fulfilled.
The solar inverter is functional in grid-parallel operation exclusively. An automatically anti-islanding
function, which was accepted by a certification agency, guarantees secure disconnection in case of
circuit isolation or interruptions in power supply and avoid isolated operation.

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2.4 Ambient temperature
The inverter can be operated in an ambient temperature from -22 °F to 140 °F (-30°C to
+60°C). The following diagram illustrates how the output power of the solar inverter is reduced
automatically in accordance with ambient temperature.
The device should be installed in a well-ventilated, cool and dry location.
Due to tolerrance of temperature sensor and efficiency difference under different PV voltage, this
derating curve may be a litter different from actual behaviors of unit.
Figure 1: Typical derating curve of M series solar inverter
2.5 Solar inverter PV input DC voltage range
0.00%
20.00%
40.00%
60.00%
80.00%
100.00%
120.00%
-30 -20 -10 0 10 20 30 40 50 60 70 80
Maximum output power of unit
Ambient Temperature/°C
Non-
Operating
Range
0
1000
2000
3000
4000
5000
6000
0100 200 300 400 500 600 700
Non-
operating
range
50V 150V 190V 230V
Voc*:Range of open
M5-TL-AU
M4-TL-AU
M3-TL-AU
Pac/W
Vin/V
120V 530V
Voc*
Range

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Figure 2: M5-TL DC voltage range
2.6 Efficiency
The best efficiency of the solar inverter is obtained at input voltages > 320V for 208V grid, and input
voltages > 380V for 230V grid. The curve is obtained at 230V,380V and 480V grid.
Figure 3: M5-TL efficiency plot
2.7 Equipment overview
Figure 4. Exterior view of solar inverter main components
A further description of the equipment features:
(1) Inverter - This is the inverter section of the assembly. This section is sealed at the factory and
85
87
89
91
93
95
97
99
0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Efficiency, %
Percentage of Rated Output Power
230 Vdc
380 Vdc
480 Vdc
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)

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there are no user-serviceable parts inside. All wiring to install the inverter is done outside.
(2) Product Label: Specification of product
(3) PV Terminal: Terminal to connect to PV panel
(4) DC Switch: Switch to operate or shutdown the inverter
(5) AC Terminal: Terminal to connect to AC grid
(6) Safety Label: Warnings and Information about safety operation
(7) Communication Box - Inverter operation mode displays and communication (BLE
4.0/WIFI/RS485, optional) to outer device is provided.
(8) Mounting Plate - The inverter ships with a mounting plate that allows easily assembly of the
inverter to a wall
(9) AC Connector: Connect to single phase AC grid line(LN) and ground line, plug it into the AC
Terminal
2.8 Inverter type and safety labels
Figure 5. Labels location
The type label is shown in figure 5. Different type labels can be found on the M series TL inverter,
the inverter serial number can be found on the type label. Please note that capital letters in
Serial Number are used as placeholders to indicate the variable information for the inverter.
The main caution label in English is on the left side of the inverter.

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Figure 5. Dimensions of M series inverter
Figure 6. Wiring terminals of M series inverter
(1) PV terminals
(2) AC terminal (Output Side)
(3) Grounding terminal
(4) AC terminal (Wiring side)
The connection terminal is as below:
Model
Manufacturer
Wiring
（
AWG
）
AC terminal
PRC 3-FC-FS6 8-21-1410661
Pheonix
10
DC terminal MALE
32.0013P0001-UR
MC
14
DC terminal
FEMALE
32.0012P0001-UR MC 14
(1) (2) (3) (4)

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3 Installation
WARNING!
AVERTISSEMENT!
WARNING!
AVERTISSEMENT!
WARNING!
AVERTISSEMENT!
Read all of these instructions, cautions, and warnings for the Delta
M series inverter and associated PV array documentation.
Installation and commissioning must be performed by a licensed
electrician in accordance with local and SAI Global AS/NZS
5033:2014 requirements.
The installation and wiring methods used in the installation of this
inverter. Australia must comply with all local, utility, SAI Global
standards AS/NZS 5033:2014 and IEC 62109 requirements.

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WARNING!
AVERTISSEMENT!
These servicing instructions are for use by qualified personnel only.
To reduce the risk of electric shock, refer all servicing to factory
qualified service personnel. No user service parts are contained
inside the inverter.
CAUTION!
PRUDENCE!
CAUTION!
PRUDENCE!
CAUTION!
PRUDENCE!
INFORMATION!
INFORMATIONS!
The secondary short-circuit current rating is increased at the trans-
fer connection point to the public electricity supply system by the
nominal current of the connected solar inverter.
To reduce the risk of fire, connect only to a circuit provided with
branch circuit overcurrent protection in accordance with AS/NZS
3000 requirements. PV overcurrent protective device with 20 A
per string is necessary for inverter connection to PV panel.
This unit or system is provided with fixed trip limits and shall not be
aggregated above 30KW on a single point of common connection.
In order to be able to carry out an energy measurement, a KWH
revenue meter must be attached between the networks feed-in
point and the solar inverter.

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3.1 Visual inspection
All Delta M series inverters are 100% tested, packaged in a heavy duty cardboard shipping carton,
and visually inspected before leaving our manufacturing facility. If you receive the inverter in a
damaged shipping carton, please reject the shipment and notify the shipping company.
Verify Delta M series shipping carton contains:
a. Correct Delta M series inverter model: M5-TL, M4-TL or M3-TL
b. Mounting plate
c. Quick Installation Guide
d. AC terminal
Visually inspect the Delta M series inverter for any physical damage such as a bent heatsink fin
and dented chassis.
If the inverter appears to be damaged or if the inverter needs to be returned, please contact your
local Delta representative.
No user serviceable parts are contained in the inverter section.
Do not attempt to open or repair the inverter. The inverter section
is factory sealed to maintain its IP65 rating and opening the top
cover of the power head will void the inverter warranty.
3.2 Installation Information
1. Install the inverter on a non-flammable support base.
2. The inverter must be mounted vertically on a flat surface.
3. A minimum distance of 6 inches (15.2 cm) of unobstructed clearance on all sides to promote
free convection is required.
4. Ensure the mounting hardware and structure can support the weight of the inverter.
5. Ensure the mounting hardware meets the appropriate building code.
6. Avoid installation on resonating surfaces (light construction walls etc.).
7. Installation can be indoors or in protected outdoor areas with shielding such as roof.
8. Avoid direct sun exposure.
9. Ensure inverter ambient temperature is within -22°F to +122°F (-30°C to +60°C) for optimal
efficiency of the PV system.
10. Chose a mounting height for easy viewing of the display.
11. Despite having a IP65 enclosure certification, the inverter must not be exposed to heavy
soiling.
12. Unused connectors and interfaces must be covered through sealing connectors.

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3.3 Mounting the inverter
Figure 7. Mounting the inverter vertically
Please make sure the inverter is installed vertically, especially if it is to be installed outdoors.
Figure 8. Inverter installation clearance
Please ensure the inverter is mounted with safe clearance and larger margin shall be left with higher
ambient temperature.