Delta Electronics RPI M6A User manual

Installation and operation manual
RPI M6A
RPI M8A
RPI M10A
Europe
solarsolutions.delta-emea.com
United Kingdom

Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
2
This manual applies to the following inverter models:
●RPI M6A (Delta part number RPI602FA0E1000)
●RPI M8A (Delta part number RPI802FA0E1000)
●RPI M10A (Delta part number RPI103FA0E1000)
With the rmware versions:
DSP: 1.48 / RED: 1.15 / COMM: 1.26 or higher
The Delta part number can be found on the type plate of the
inverter. The rmware versions are listed on the display in the
Inverter Info. menu.
Delta manuals undergo continuous revision in order to provide
you with complete information regarding the installation and oper-
ation of its inverters. Therefore, before starting installation work,
always consult solarsolutions.delta-emea.com to check whether
a newer version of the Quick Installation Guide or the Installation
and Operation Manual is available.
© Copyright – Delta Electronics (Netherlands) B.V. – All rights
reserved.
This manual is intended for use by electrical installers who are
trained and approved for installation and commissioning of grid-
connected solar inverters.
The information in this manual is to be treated as condential and
no part of this manual may be reproduced without prior written
permission from Delta Electronics. The information in this manual
may not be used for any purpose not directly connected to the
use of the inverter.
All information and specications can be modied without prior
notice.
All translations of this manual that are not authorized by Delta
Electronics (Netherlands) B.V. must be marked with the words
"Translation of the original operating instructions."
Delta Electronics (Netherlands) B.V.
Tscheulinstraße 21
79331 Teningen
Germany
Authorized representative for this product in the EU:
Delta Electronics (Netherlands) B.V.
Zandsteen 15
2132 MZ Hoofddorp
Netherlands

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Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
Table of Contents
Table of Contents
1. About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Purpose of this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.2 Target audience of this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.3 How to use this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Warning notices and warning symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.5 Writing and labeling conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
2. Basic safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
3. Intended purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Components and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2.1 Overview of components and connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Display, buttons, status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.4 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4.1 Overview of electrical connections M6A, M8A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4.2 Overview of electrical connections M10A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4.3 AC/DC disconnection switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.4 Power socket (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4.5 DC connection panel for solar modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.6 RS485, 12-VDC connection, Wi-Fi. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.7 Digital inputs, dry contacts, external power-o󰀨 (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.5 Mounting holes and grounding connection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.6 Information on the type plate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5. Planning the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Mounting location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Outdoor installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 Mounting clearances and air circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.4 Characteristic curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.5 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.6 Grid connection (AC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.1 Important safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.2 Residual current circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.3 Integrated residual current monitoring unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.4 Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.5 Grounding the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.6 Permissible grounding systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.6.7 Requirements for the grid voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7 Connecting the solar modules (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.7.1 Symmetrical and asymmetrical conguration of the DC inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.7.2 Separately connected DC inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.7.3 Parallel-connected DC inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.7.4 Connection of solar modules that are not grounded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.7.5 Connecting grounded solar modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.7.6 Connecting the module strings to the DC inputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.7.7 DC cable requirements. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.8 Connecting a data logger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.9 Connecting an external alarm unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.10 Connecting a ripple control receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.11 External power-o󰀨 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

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Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
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5.12 Using external grid and system protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.13 Connecting a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.14 Tools and materials required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.14.1 For mounting the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.14.2 For connecting to the grid (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.14.3 For connecting to the solar modules (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.4 For grounding the inverter housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.5 For wiring the RS485 connections, the digital inputs and the dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.6 For connection of a PC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.7 Other parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.1 Safety Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6.2 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3 Connecting a data logger via RS485. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.3.1 Components of the RS485 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.3.2 Preparing for work on the RS485 card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.3.3 Wiring for a single inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.3.4 Wiring for multiple inverters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.3.5 Completing work on the RS485 card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.4 Connecting the communication card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.4.1 Components of the communication card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
6.4.2 Preparing for work on the communication card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
6.4.3 Wiring for an external alarm unit with an external 12 VDC power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
6.4.4 Wiring for an external alarm unit with an internal 12 VDC power supply . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
6.4.5 Wiring digital inputs and external power-o󰀨 (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.4.6 Wiring digital inputs and external power-o󰀨 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
6.4.7 Completing work on the communication card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.5 Mounting the inverter and grounding the inverter housing. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
6.6 Connecting to the grid (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.7 Connecting the solar modules (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
6.8 Attaching warning labels to the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
6.9 Connecting a PC via RS485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
7. Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8. Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8.2 "Inverter info." menu area (current settings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8.3 "General settings" menu area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
8.3.1 Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
8.3.2 Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.3.3 Baud rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
8.4 "Installation settings" menu area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.4.1 Inverter ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.4.2 Insulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.4.3 Country. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.4.4 Grid settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.4.5 DC Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
8.4.6 Dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
8.4.7 RCMU (Integrated residual current monitoring unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
8.4.8 EPO (External Shutdown) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
8.4.9 AC connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
8.4.10 Anti-islanding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
8.4.11 Max. Power (Infeed Limiting). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101

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Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
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8.4.12 Loading the factory settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
8.4.13 Restart or reset the Wi-Fi module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
8.5 "Active/reactive power" menu area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.5.1 Power limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.5.2 Regulating the active power via the grid frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .107
8.5.3 P (V) (regulating the active power via the grid voltage) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
8.5.4 Constant cos phi (cos φ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .112
8.5.5 Cos phi (P) (regulate cos phi via active power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
8.5.6 Constant Q (constant reactive power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
8.5.7 Q (V) – Regulating reactive power via voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .118
8.6 FRT (Fault Ride Through) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .121
9. Measurements and statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
9.1 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .123
9.3 Event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
9.3.1 Error events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
9.3.2 Grid report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
10. Error events and troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .128
10.1 Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129
10.2 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
10.3 Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
11. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
12. Replacing the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133
13. Technical Data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .142

1 About this manual
Purpose of this manual
Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
6
1. About this manual
1.1 Purpose of this manual
This manual is part of the inverter and supports the installation,
commissioning and operation of the inverter.
Read this manual before working on the inverter.
Always follow the safety instructions and work instructions in this
manual. This will ensure that the inverter can be safely installed,
commissioned and operated.
Store this manual in a safe place in the vicinity of the inverter so
that it is always quickly available when working on the inverter.
Delta Electronics is not responsible for damage resulting from
failure to follow the safety and operating instructions set out in
this manual.
1.2 Target audience of this manual
This manual is intended for installers who are trained and
approved for the installation, commissioning and operation of
solar inverters in grid-connected solar systems.
1.3 How to use this manual
The structure of this manual, in addition to the symbols and text
markings used, is described in the chapter 1. About this man-
ual. The latter means that the contents are marked according to
their meaning. Thus operations, names of buttons and display
texts can be recognized even by their specic formatting.
The chapter 2. Basic safety instructions identies the safety
risks associated with using the inverter. You must read this chap-
ter in order to ensure safe handling of the installation, mainte-
nance and operation of the inverter.
The purposes for which the inverter may be used are described
in the chapter 3. Intended purpose . This section also describes
purposes for which the use of the inverter is not allowed, even
though in some cases they are similar to the purposes for which
the inverter may be used.
The chapter 4. Product overview gives a brief description of
the location and use of the most important components of the
inverter. In this section you will see for instance where the cables
for the grid and the solar modules are connected.
The chapter 5. Planning the installation describes the planning
of the installation and contains information about e󰀨ective prepa-
rations for installation of the inverter and avoiding delays in its
installation. This includes, where necessary, descriptions of the
operating behavior of the inverter. In this section you will learn
for instance what you must consider in selecting, calculating and
laying the cables.
The section 6. Installation gives detailed step-by-step instruc-
tions. This section contains a description, for example, of how
the sequence of work steps for connecting the cables is orga-
nized and how you can perform these steps directly. So that this
proceeds smoothly, you must rst read the section 4. Product
overview and 5. Planning the installation to ensure you have
prepared everything.
The section 7. Commissioning describes exclusively the com-
missioning procedure on the display which starts automatically as
soon as the inverter is supplied with power for the rst time.
Error messages, their cause and measures for their rectication
are listed in the section 10. Error events and troubleshooting.
Follow the instructions without fail. Do not attempt to correct an
error marked "Contact Delta Customer Service" yourself.
Maintenance work that you can perform yourself is described in
the section 11. Maintenance. All other maintenance work may be
performed only after consultation with Delta Customer Service.
The chapter Replacement 12. Replacing the inverter guides
you step-by-step through the work steps for replacing the
inverter.
A list of the most important technical data can be found in the
chapter 13. Technical Data. If you require technical values over
and above this, please contact Delta Customer Service.

7
Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
1 About this manual
How to use this manual
1.4 Warning notices and warning symbols
This manual uses the following warning notices and symbols
to describe potential dangers and the measures necessary for
reducing these dangers.
Always follow the instructions in the warning notices.
Warning levels
DANGER
Indicates a dangerous situation that will always lead to
death or severe injuries if not avoided.
WARNING
Indicates a dangerous situation that can lead to death or
severe injuries if not avoided.
CAUTION
Indicates a dangerous situation that can lead to light or
medium injuries if not avoided.
ATTENTION
Indicates possible material damage that can be caused
to other objects by the inverter.
A notice provides information on e󰀩cient use of the
inverter.
If necessary, the warning labels are also marked with warning
symbols indicating the source of the danger.
High electrical voltages or currents
Hot surfaces
Heavy weight
General danger
1.5 Writing and labeling conventions
Some sections in this manual are specially labeled.
Labeling of work instructions
Work instructions that must be performed in a specic sequence
are numbered accordingly. Numbered work instructions must
always be performed in the specied sequence.
1. First step
→Where necessary, the result of the work step is de-
scribed here. This is used for checking that the work
step has been completed correctly.
2. Second step
3. Third step
þWork step is now complete.
If the work instructions consist of only a single step or the work
steps can be performed in any desired sequence then the work
steps are labeled as follows:
►Step
►Step
Labeling of inverter components
Buttons
ENT
Text on the inverter display Inverter info.
LEDs Alarm LED
LED Meaning
LED stays on.
LED ashes.
LED is o󰀨.

2 Basic safety instructions
Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
8
2. Basic safety instructions
DANGER
Electric shock
Potentially fatal voltages are present in the
inverter during operation. When the inverter is
disconnected from all power sources, this volt-
age regrid in the inverter for up to 60 seconds.
You should therefore always carry out the fol-
lowing steps before working on the inverter:
1. Turn the AC/DC disconnector to the OFF
position.
2. Disconnect the inverter from all AC and DC
voltage sources and make sure that none
of the connections can be restored acciden-
tally.
3. Wait at least 60 seconds for the internal
capacitors to discharge.
DANGER
►Electric shock
►Potentially fatal voltages are present at the
DC connections of the inverter. When light
falls on the solar modules, they immediately
start to generate electricity. This also hap-
pens when light does not fall directly on the
solar modules.
►Never disconnect the inverter from the solar
modules when it is under load.
►Turn the AC/DC disconnector to the OFF
position.
►Disconnect the connection to the grid so
that the inverter cannot feed energy into the
grid.
►Disconnect the inverter from all AC and DC
voltage sources. Make sure that none of the
connections can be restored accidentally.
►Ensure that the DC cables cannot be
touched accidentally.
DANGER
Electric shock
The inverter has a high leakage current value.
►Always connect the ground cable rst, then
the AC and DC cables.
●To comply with IEC 62109-5.3.3 safety requirements and
avoid injury or material damage, the inverter must be in-
stalled and operated in accordance with the safety and op-
erating instructions set out in this manual. Delta Electronics
is not responsible for damage resulting from failure to follow
the safety and operating instructions set out in this manual.
●The inverter may only be installed and commissioned by
installers who have been trained and approved for the in-
stallation and operation of grid-connected solar inverters.
●All repair work on the inverter must be carried out by Delta
Electronics. Otherwise the warranty will be void.
●Warning notices, warning symbols and other markings
attached to the inverter by Delta Electronics must not be
removed.
●To avoid the risk of arcing, do not disconnect cables when
the inverter is under load.
●To prevent damage due to lightning strikes, follow the ap-
plicable regulations in your country.
●The surface of the inverter can get very hot during opera-
tion. Always wear safety gloves when touching the inverter
(except for the display).
●All connections must be su󰀩ciently sealed in order to en-
sure the IP65 rating. Seal any connections that will not be
used with the covering caps provided.
●Only equipment in accordance with SELV (EN 60950) may
be connected to the RS485 interfaces.

9
Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
3 Intended purpose
3. Intended purpose
The inverter may be used only for the specied intended pur-
pose.
The intended purpose of the inverter is dened as follows:
●Use in stationary solar systems connected to the public
grid, for converting DC voltage generated by the solar
modules in the solar system into AC voltage that is fed into
the public grid.
●Use in conformance with the power specications and envi-
ronmental conditions specied by the manufacturer.
The following uses are regarded as not for the intended pur-
poses:
●Use in stand-alone mode, i.e. without a connection to the
public grid. The inverter has functions that prevent isolated
operation.
●Use in mobile solar systems

4 Product overview
Scope of delivery
Installation and Operation Manual for Power Inverter RPI M6A M8A M10A EU V4 EN 2020-07-13
10
4. Product overview
4.1 Scope of delivery
Part Quan-
tity‹
Figure / Description Part Qty Figure / Description
Inverter 1 AC plug 1
Amphenol C16-3
Mounting plate 1 M4 mounting
screws 2
For fastening the inverter to the
mounting plate and for grounding
the inverter housing. With washer,
spring washer and toothed lock
washer .
DC plug
M6A: 2
M8A: 2
M10A: 3
Multi-contact MC4 for DC+ for
4/6 mm2 (32.0017P0001-UR)
Quick Installation
Guide 1
Installations- und Betriebshandbuch
RPI M6A
RPI M8A
RPI M10A
Deutschland Österreich SchweizBelgien
solarsolutions.delta-emea.com
M6A: 2
M8A: 2
M10A: 3
Multi-contact MC4 for DC– for
4/6 mm2 (32.0016P0001-UR)
Check the delivery for completeness and all
components for damage before starting installa-
tion work.
Do not use any damaged components.
Keep the packaging.