Delta RPI M50A User manual

Installation and operation manual
RPI M50A_12s Solar Inverter
Europe generalUnited Kingdom

3
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
This manual applies to the following inverter models:
●RPI M50A_12s (Delta part number: RPI503M221000)
with firmware versions:
DSP: 1.50 / RED: 1.24 / COM: 1.34
The Delta part number can be found on the type plate of the
inverter. The firmware versions are listed on the display in the
Inverter Info. menu.
Authorized representative for this product in the EU: Delta Electronics (Netherlands) B.V.; Zandsteen 15, 2132 MZ Hoofddorp, NL
© Copyright – Delta Energy Systems (Germany) GmbH – All
rights reserved.
This manual is intended for installers.
The information in this manual is to be treated as confidential and
no part of this manual may be reproduced without prior written
permission from Delta Energy Systems. The information in this
manual may not be used for any purpose not directly connected
to use of the inverter.
All information and specifications can be modified without prior
notice.
If you notice discrepancies between the descriptions in this quick
installation guide and the information on the inverter display, go
to www.solar-inverter.com and download the version of the quick
installation guide that matches the model number and the firm-
ware version of your inverter.
On the website, you will also find the installation and operation
manual with detailed information about the inverter.
Delta Energy Systems (Germany) GmbH
Tscheulinstraße 21
79331 Teningen
Germany

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Table of Contents
1. About This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Purpose of This Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Target audience of this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.3 Warning notices and warning symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.4 Writing and labeling conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2. Basic safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
3. Intended purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4. Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2 Overview of components and connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.3 Display, buttons, status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 String fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Surge protection devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.6 Air inlets, air outlets and fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7 Electrical connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.2 Grounding connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.3 AC/DC disconnector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.7.4 AC connection (AC OUTPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7.5 DC connection (DC INPUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.7.6 Communication port 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.7.7 Communication port 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
4.8 Information on the Type Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5. Planning installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.1 Installation location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.2 Outdoor installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
5.3 Installation clearances and air circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.4 Characteristic curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.5 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.6 AC connection (grid) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.1 Important safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
1.1.1 Residual current circuit breaker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.2 Integrated residual current monitoring unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.3 Integrated string fuses and surge protection devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.4 Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.5 Grounding the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
5.6.6 Permissible grounding systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.6.7 Requirements for the grid voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.7 DC connection (solar modules) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.7.1 SymmetricandasymmetriccongurationoftheDCinputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.7.2 Separately connected and parallel-connected DC inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.7.3 Parallel-connected DC inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.7.4 Connecting solar modules that are not grounded . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
5.7.5 Connecting grounded solar modules. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
5.7.6 Connecting the DC strings to the DC inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
5.7.7 Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
5.8 Connecting a data logger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.9 Connecting an external alarm unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
5.10 Connecting a ripple control receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

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5.11 External power-off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
5.12 Using external grid and system protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.13 Connecting a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
5.14 Tools and materials required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.1 For mounting the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.2 For connecting to the grid (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
5.14.3 For connecting to the solar modules (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.14.4 For grounding the inverter housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.14.5 For wiring the RS485 connections, the digital inputs and the dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . 43
5.14.6 For connecting a PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
5.14.7 Other parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
6. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.1 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.2 Sequence of installation steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.3 Mounting the inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
6.4 Grounding the inverter housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.5 Connecting the communication card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.5.1 Components of the communication card. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.5.2 Initial steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
6.5.3 Connecting a data logger via RS485. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
6.5.3.1 Wiring for a single inverter ...........................................................................55
6.5.3.2 Wiring for multiple inverters ..........................................................................56
6.5.4 Connecting an external alarm unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
6.5.4.1 Wiring for an external alarm unit with an external 12 VDC power supply.........................................59
6.5.4.2 Wiring for a single alarm unit with an internal 12 VDC power supply ............................................60
6.5.4.3 Wiring for two alarm units with an internal 12 VDC power supply ..............................................61
6.5.5 Connecting digital inputs and external power-off (EPO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
6.5.6 Final work . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6.6 Connecting to the grid (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
6.7 Connecting solar modules (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
6.8 Attaching warning labels to the inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
6.9 Connecting a PC via RS485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
7. Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
8. Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
8.2 "Inverter info." menu area (current settings) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
8.3 "General settings" menu area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.3.1 Language . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.3.2 Date and Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
8.3.3 Baud rate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.3.4 Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.3.5 Test menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82
8.4 "Installation settings" menu area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.4.1 Inverter ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
8.4.2 Insulation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
8.4.3 Country. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
8.4.4 Grid settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
8.4.4.1 Overview ........................................................................................87
8.4.4.2 Voltage protection..................................................................................88
8.4.4.3 Frequency protection ...............................................................................91
8.4.4.4 Reconnection time .................................................................................93
8.4.4.5 P Ramp Up.......................................................................................95

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8.4.5 DC Injection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
8.4.6 Dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
8.4.7 RCMU (Integrated residual current monitoring unit) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100
8.4.8 EPO (External power-off ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101
8.4.9 AC connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
8.4.10 Anti-islanding. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
8.4.11 Max. power (maximum active power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .104
8.4.12 Loading the factory settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
8.5 "Active/reactive power" menu area . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
8.5.1 Power limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .106
8.5.2 Regulating the active power via the grid frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .108
8.5.3 P (V) (regulating the active power via the grid voltage) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
8.5.4 Constantcosphi(cosφ) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .113
8.5.5 Cos phi (P) (regulate cos phi via active power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115
8.5.6 Constant Q (constant reactive power) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
8.5.7 Q (V) – Regulating reactive power via voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .119
8.6 FRT (Fault Ride Through) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .122
9. Measurements and statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
9.1 Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .124
9.2 Energy log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .125
9.3 Event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
9.3.1 Error events . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .126
9.3.2 Grid report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .127
10. Error events and troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129
10.1 Error . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .130
10.2 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .131
10.3 Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .132
11. Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .134
11.1 Periodic maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .135
11.2 Checking the fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .136
11.3 Replacing/cleaning the fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .138
11.4 Cleaning the air inlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .144
11.5 Replacing the surge protection devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .146
11.6 Replacing string fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .152
12. Decommissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .156
13. Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .164

7
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
1 About This Manual
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 Energy Systems 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 Warning notices and warning symbols
This manual uses the following warning notices and symbols for
describing 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 efficient use of the
inverter.
If necessary, the warning notices are also marked with warning
symbols indicating the source of the danger.
High electrical voltages or currents
Hot surfaces
Heavy weight
General danger

1 About This Manual
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
8
1.4 Writing and labeling conventions
Some sections in this manual are specially labeled.
Labeling of work instructions
Work instructions that must be performed in a specific sequence
are numbered accordingly. Numbered sequences of work steps
must always be performed in the specified 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 finished.
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 flashes.
LED is off.

9
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
2 Basic safety instructions
2. Basic safety instructions
DANGER
Electrical shock
Potentially fatal voltage is applied to the inverter
during operation. When the inverter is discon-
nected from all power sources, this voltage
remains in the inverter for up to 10 seconds.
Therefore, always carry out the following 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 accidentally
restored.
3. Wait for at least 10 seconds until the internal
capacitors have discharged.
DANGER
Electrical shock
Potentially fatal voltage is present at the invert-
er's DC connections. When light falls on the solar
modules, they immediately start to generate
electricity. This also happens 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 supply energy to the grid.
►Disconnect the inverter from all AC and DC
voltage sources. Ensure that none of the
connections can be restored accidentally.
►Ensure that the DC cables cannot be touched
accidentally.
WARNING
Electrical shock
When the cover is removed from the fuse box,
this exposes live parts and protection conforming
to IP65 is no longer guaranteed.
►Remove the cover only when it is absolutely
necessary.
►Do not remove the cover if water might enter
the inverter.
►After work is completed, ensure that the
cover is properly replaced and screwed in.
Check that the cover is properly sealed.
WARNING
Heavy weight
The inverter is very heavy.
►The inverter must be lifted and carried by
at least 3 people or using appropriate lifting
gear.
●To comply with the IEC 62109-5.3.3 safety requirements
and avoid injury or material damage, the inverter must be
installed and operated in accordance with the safety and
operating instructions set out in this manual. Delta Energy
Systems 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 certified for the installa-
tion and operation of grid-based solar inverters.
●All repair work on the inverter must be carried out by Delta
Energy Systems. Otherwise, the warranty will be void.
●Warning instructions and warning symbols attached to the
inverter by Delta Energy Systems must not be removed.
●The inverter has a high leakage current value. The grounding
cable must be connected before commencing operation.
●Do not disconnect any cables while the inverter is under load
due to risk of a fault arc.
●To prevent damage due to lightning strikes, follow the provi-
sions that apply in your country.
●The surface of the inverter can get very hot during operation.
Only touch the inverter (outside of the display) with safety
gloves.
●Only equipment in accordance with SELV (EN 60950) may
be connected to the RS485 interfaces.
●All connections must be sufficiently insulated in order to en-
sure the IP65 protection degree. Unused connections must
be closed using cover caps.

3 Intended purpose
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
10
3. Intended purpose
The inverter may only be used for the specified intended pur-
pose.
The intended purpose of the inverter is defined 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 specifications and envi-
ronmental conditions specified by the manufacturer.
The following uses are regarded as not the intended purposes:
●Use in stand-alone mode, i.e. without a connection to the
public grid. The inverter has functions for preventing operat-
ing in stand-alone mode.
●Use in mobile solar systems

11
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
4 Product overview
4. Product overview
4.1 Scope of delivery
Part Quantity Description Part Quantity Description
Inverter 1 AC plug 1
China Aviation Optical-Electrical
Technology Co. PVE5T125KE36
Mounting plate 1 Sealing rings for
AC plug 1
1 set with 3 sealing rings
DC plug
12
Multi-Contact MC4-plug for DC +
(32.0017P0001-UR for 4/6 mm2)
Grounding
screw 1
To ground the inverter housing;
with spring washer, washer and
lock washer; mounted on the
inverter
12
Multi-Contact MC4-plug for DC–
(32.0016P0001-UR for 4/6 mm2)
Quick installa-
tion guide and
basic safety
instructions
1
Installations- und Betriebshandbuch
RPI M50A_12s
Deutschland Österreich SchweizBelgien
Check the delivery for completeness and all com-
ponents for damage before starting installation
work.
Do not use any damaged components.
Keep the packaging.

4 Product overview
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
12
4.2 Overview of components and connections
1
2
3
4
5
6
Fig. 4.1: Overview of components and connections
1Display, buttons, and LED See “4.3 Display, buttons, status LEDs”, page 13
2Fuse box with string fuses and overvoltage conductors See “4.4 String fuses”, page 14 and “4.5 Surge protection
devices”, page 15
3Air inlets See “4.6 Air inlets, air outlets and fans”, page 15
4Electrical connections See “4.7 Electrical connections”, page 16
5Fans See “4.6 Air inlets, air outlets and fans”, page 15
6Type plate See “4.8 Information on the Type Plate”, page 20

13
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
4 Product overview
4.3 Display, buttons, status LEDs
Fig. 4.2: Overview of display, buttons, and LEDs
Label Designation Use
LEDs
Grid Grid Green LED; lights up when the inverter is supplying power to the grid.
AlArm Alarm Red LED; displays a warning, an error or a fault.
Buttons
EXIT Exit Exit the current menu.
Cancel the setting of a parameter. Changes are not adopted.
Down Move downwards in the menu.
Reduce the value of a configurable parameter.
Up Move upwards in the menu.
Increase the value of a configurable parameter.
ENT Enter
Select menu item.
Open a configurable parameter for editing.
Accept the setting of a parameter. Changes are adopted.

4 Product overview
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
14
4.4 String fuses
Fig. 4.3: Position of the string fuses on the inverter
Fig. 4.4: Assignment of the string fuses to the DC inputs
The inverter has string fuses on the DC side.
Fig. 4.5: The inverter uses Littlefuse string fuses
Type
Manufacturer Littelfuse
Part number 0SPF015.T
Nominal current 15 A
Nominal voltage 1000 V
or
Manufacturer Hollyland
Part number 10GPV15UO
Nominal current 15 A
Nominal voltage 1000 V

15
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
4 Product overview
4.5 Surge protection devices
Fig. 4.6: Position of the surge protection devices on the
inverter
AC DC
Fig. 4.7: Assignment of the surge protection devices (AC and
DC)
The inverter has replaceable type 2 surge protection devices on
the AC side and the DC side. The surge protection devices pro-
tect the inverter from excessively high voltages.
The surge protection devices are located behind the fuse box
cover.
Type for the AC side
Type 2 OCM as per EN 61643-11
Nominal current In10 kA (8/20)
Maximum current Imax 20 kA (8/20)
Voltage UP1.8 kV
Type for the DC side
Type 2 OCM as per EN 50539-11
Current In20 kA (8/20)
Current Imax 40 kA (8/20)
Voltage UP≤3.9kV
4.6 Air inlets, air outlets and fans
Fig. 4.8: Air inlets are located at the top of the left and right
sides
Fig. 4.9: Position of the fans and air outlet on the inverter
Ambient air is sucked into the air inlets by the fans, passed
through the inverter for cooling and the heated air is then
expelled to the environment via the air outlet.

4 Product overview
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
16
4.7 Electrical connections
4.7.1 Overview
1 2 3 4 5 6
Fig. 4.10: Overview of electrical connections
Component/Connection Label on the inverter Description
1Grounding connection - Further information is provided in
“4.7.2 Grounding connection”, page 17
2AC/DC disconnector DISCONN. AC/DC Further information is provided in
“4.7.3 AC/DC disconnector”, page 17
3AC connection AC OUTPUT Further information is provided in
“4.7.4 AC connection (AC OUTPUT)”, page 18
4DC connections DC INPUT Further information is provided in
“4.7.5 DC connection (DC INPUT)”, page 18
5Communication port 1 COMM. Further information is provided in
“4.7.6 Communication port 1”, page 19
6Communication port 2 COMM. Further information is provided in
“4.7.7 Communication port 2”, page 19

17
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
4 Product overview
4.7.2 Grounding connection
Fig. 4.11: Position of the grounding connection on the inverter
The inverter housing can be grounded via the grounding connec-
tion.
M6 screw, spring washer, washer, and toothed lock washer are
already mounted on the inverter.
4.7.3 AC/DC disconnector
Fig. 4.12: Position of the AC/DC disconnector on the inverter
The inverter is disconnected from the grid and the solar mod-
ules when the AC/DC disconnector is in the OFF position.
The inverter is connected to the grid and the solar modules
when the AC/DC disconnector is in the ON position.

4 Product overview
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
18
4.7.4 AC connection (AC OUTPUT)
Fig. 4.13: Position of the AC connection on the inverter
The inverter is connected to the public grid via the AC connec-
tion.
Purpose:
●Feeding AC power into the public grid.
●Providing power for the display when power is not available
from the solar modules.
Grid types that can be used:
●Grids with 3 phases and a neutral conductor: 3P4W (L1, L2,
L3, N, PE)
●Mains grids with 3 phases and without a neutral conductor:
3P3W (L1, L2, L3, PE).
Plug type required:
China Aviation Optical-Electrical Technology Co. PVE5T125KE36
The AC plug is included in the scope of delivery.
4.7.5 DC connection (DC INPUT)
Fig. 4.14: Position of the DC connections on the inverter
The solar modules are connected to the DC connections.
Plug type required:
●Multi-contact MC4 32.0017P0001-UR for DC+
●Multi-contact MC4 32.0016P0001-UR for DC–
12 pairs of DC plugs are supplied in the scope of delivery.

19
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
4 Product overview
4.7.6 Communication port 1
Fig. 4.15: Position of communication connection 1 on the
inverter
Available connections:
Connection Connection type
2x RS485 (DATA+ and DATA–) Terminal block
1x VCC (12 V, 0,5 A) Terminal block
6x digital inputs Terminal block
2x dry contacts Terminal block
1x external power-off (EPO) Terminal block
4.7.7 Communication port 2
Fig. 4.16: Position of communication connection 2 on the
inverter
Communication connection 2 is not used on this inverter.

4 Product overview
Installation and Operation Manual for Inverter RPI M50A_12s V1 EU EN 2017-03-09
20
4.8 Information on the Type Plate
Information on the Type Plate Description
10 seconds
Danger to life through electric shock
Potentially fatal voltage is present inside the inverter during operation and this voltage is
still present 10 seconds after disconnection of the power supply.
Only the fuse box may be opened. All other device parts may not be opened.
Before working on the solar inverter, you must read the supplied manual and follow the
instructions contained therein.
This inverter is not separated from the grid by a transformer.
The housing of the inverter must be grounded if this is required by local regulations.
WEEE marking
The inverter must not be disposed of as standard household waste, but in accordance with
the applicable electronic waste disposal regulations of your country or region.
DC input
200~1000 V DC DC input voltage range
MPPT 520-800 V DC MPP input voltage range at full power (with symmetrically configured DC inputs)
1000 V DC Maximum DC input voltage
50 A*2 max. Maximum DC input current (50 A at DC1 and DC2 respectively)
Isc: 60 A*2 max. DC short-circuit current
AC output
220/380, 230/400 Vac AC nominal voltage
3P3W or 3P4W The inverter can be connected to 3-phase grids without neutral conductors (3P3W, 3
phases + PE) and 3-phase grids with neutral conductors (3P4W, 3 phases + N + PE).
50 / 60 Hz AC nominal frequency
50 kW nom. Nominal active power
55 kW/55 kVA Maximum active power/reactive power
Max. 80 A Maximum AC current
cosφ0,8ind.~0.8cap. Settingrangeofthedisplacementfactorcosφ
IP code: IP65 (Electronics) Degree of protection for the electronics as per EN 60529
Protective Class: I Safety class as per EN 61140
AC Overvoltage Category: III AC overvoltage category as per IEC 62109-1
Assembled in China Assembled in China