Delta Electronics RPI M50A_120, RPI M50A_122 Installation And Operation Manual
Installation and Operation Manual
RPI M50A_120
RPI M50A_122
Europe
This manual applies for solar inverter models:
● RPI M50A_120 (with string fuses and surge protec-
tion devices)
● RPI M50A_122 (with string fuses only)
with rmware version:
DSP: 1.31 / RED: 1.12 / COM: 98.26
The latest version of this manual is available at
www.solar-inverter.com.
Delta Energy Systems (Germany) GmbH
Tscheulinstrasse 21
79331 Teningen
Germany
© Copyright – Delta Energy Systems (Germany) GmbH – All rights reserved.
This manual is included with our solar inverter and is intended for use by the installer and
end user.
The technical instructions and illustrations in this manual are to be treated as condential
and no part of this manual may be reproduced without prior written permission from Delta
Energy Systems. Maintenance technicians and end users may not release the information contained in this manual, and may not use it for purposes not directly associated with
the proper use of the solar power inverter.
All information and specications can be modied without prior notice.
2
Installation and Operation Manual for RPI M50A
Table of Contents
Table of Contents
1. About this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Purpose of this manual. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 Target audience of this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Warnings and symbols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.4 Conventions used in this manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. General safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3. Intended use. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
4. Product overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Scope of delivery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Components and connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Display, buttons, status LEDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.4 String fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
4.5 Surge protection devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5.1 AC side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.5.2 AC side. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.6 Air inlets and fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.7 Electrical connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.7.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.7.2 AC/DC disconnection switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7.3 AC connector (AC output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7.4 DC connectors (DC inputs) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7.5 Communication port 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7.6 Communication port 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.7.7 Grounding connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.8 Information on the type label . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5. Planning the installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Where to mount the solar inverter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Outdoor installations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3 Ambient conditions and air circulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.4 Temperature derating curves. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.5 Efciencycurve . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.6 Dimensions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.7 AC connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
5.8 DC connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.8.1 Symmetrical and asymmetrical power input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.8.2 Use with solar modules that do not need to be grounded. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5.8.3 Use with solar modules that have to be grounded. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.8.4 Using DC1 and DC2 with only one MPP tracker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
5.9 Connecting to a datalogger via RS485. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.10 Circuit diagram of string fuses and SPDs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
5.11 What you need . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6. Installation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.1 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
6.2 Mounting the inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
6.3 Grounding the inverter housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
6.4 Connecting to the grid (AC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
6.5 Connecting to the solar modules (DC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.5.1 Safety instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.5.2 Cablespecication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
6.6 Using DC1 and DC2 with only one MPP tracker (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
6.7 Connecting communication port I (optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
6.7.1 RS485 and VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Installation and Operation Manual for RPI M50A
3
Table of Contents
6.7.2 Dry contacts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.7.3 Digital inputs and EPO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
6.8 Wiring communication port 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.8.1 First steps for all cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.8.2 Wiring a single inverter for RS 485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
6.8.3 Wiring multiple inverters for RS 485. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
6.8.4 Wiring the dry contacts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.8.5 Wiring the digital inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.8.6 Finishing the wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
6.9 Putting labels on the inverter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
7. Commissioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
8. Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
8.2 Current grid settings (inverter information). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
8.3 Display language. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
8.4 Date and time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
8.5 Baud rate for RS485 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
8.6 Inverter ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
8.7 Insulation mode and insulation resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
8.8 Grid settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.8.1 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.8.2 Voltage protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
8.8.3 Frequency protection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
8.8.4 Reconnection time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
8.8.5 P Ramp Up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
8.9 EPO (External Power Off) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
8.10 AC Connection type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
8.11 Max. Power (Maximum feed-in power). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
8.12 Power limitation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
8.13 Power versus frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
8.14 Constant cos phi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
8.15 Cos phi (P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
8.16 Constant Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
8.17 Q (V) - Apparent power versus voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.18 FRT (Fault Ride Through) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83
9. Measurements and statistics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9.1 Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
9.2 Energy log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87
9.3 Event log . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
9.4 Inverter information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
10. Error messages and trouble shooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
10.1 Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
10.2 Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
10.3 Faults. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
11. Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
11.1 Regular maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
11.2 Replacing the fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
11.3 Cleaning the fans . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
11.4 Cleaningtheairlters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98
11.5 Replacing surge protection devices (SPD) on the DC side . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
11.6 Replacing surge protection devices (SPD) on the AC side . . . . . . . . . . . . . . . . . . . . . . . . . . .100
11.7 Replacing string fuses . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .102
12. Decommissioning. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .103
13. Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .105
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Installation and Operation Manual for RPI M50A
1. About this manual
1. About this manual
1.1 Purpose of this manual
This manual is part of the inverter and will help you
become familiar with the inverter.
Always follow the safety instructions given in this
manual. You can help keep the product durable and
reliable during its use by handling it carefully.
Read the manual carefully and thoroughly and follow
the instructions contained therein. This manual contains important information on the installation, commissioning and operation of the solar inverter.
Always follow the general safety instructions (see
“2 General safety instructions”, p. 7).
Store the manual in a safe place near the inverter, so
that installer and operator have easy access to this
manual.
The solar inverter can be safely and normally operated if installed and used in accordance with this
manual. Delta Energy Systems is not responsible for
damage incurred by failure to comply with the installation and operating instructions in this manual.
1.3 Warnings and symbols
Where hazards may arise when working with the solar
inverter, the following hazard levels and symbols are
used to indicate these hazards:
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
ATTENTION is used to address practices not
related to physical injury.
1.2 Target audience of this manual
This manual is aimed at qualied electricians who
have received a sufcient training to apply safe meth-
ods of work to install a micro-generator in compliance
with the requirements of the applying standard.
Only chapter “9 Measurements and statistics”,
p. 85 is relevant to the operator. All other activities
may only be performed by qualied electricians.
A note provides general information on using
the solar inverter. A note does not indicate
hazardous situations.
Where required, further, supplementary warning
symbols are used. Type and source of the hazard is
explained in the safety instructions or warnings.
This symbol is a warning of a risk of
electric shock due to high voltage.
The symbol is a warning of a hot surface.
This symbol is a warning of general
hazards.
Installation and Operation Manual for RPI M50A
5
1. About this manual
1.4 Conventions used in this manual
Order of instructions
Numbered instructions must be performed in the
specied order.
1. First instruction step
→ When the solar inverter reacts to a step, this
reaction is marked with an arrow.
2. Second instruction step
3. Third instruction step
Instructions consisting of only one step or when the
order of the instruction steps is not important, are
shown as follows:
► Instruction step
► Instruction step
Device buttons and LEDs
Device buttons and LEDs are shown in this manual as
follows:
Buttons on the solar inverter:
LEDs on solar inverter:
LED symbol Meaning
Information on Display
Information shown on the solar inverter display
includes menus, settings and messages.
This information is shown in this manual as follows:
Menu names: User settings menu
Parameter names: Cos phi parameter.
AlArm LED
LED stays on.
LED ashes.
LED is off.
ESC
button.
6
Installation and Operation Manual for RPI M50A
2. General safety instructions
2. General safety instructions
DANGER
High electrocution
Potentially fatal voltage is applied to
the solar inverter during operation. This
potentially fatal voltage is still present
for 10 seconds after all power sources
have been disconnected.
► Always disconnect the inverter from
power before installation, open the
AC/DC isolating switch and make
sure neither can be accidentally
reconnected.
► Only the cover from the fuse section
may be removed. Never open other
parts of the inverter.
► Wait at least 10 seconds until the
capacitors have discharged.
DANGER
High electrocution
Potentially fatal voltage may be applied to the DC connections of the solar
inverter. When light is falling on solar
modules, they immediately start producing energy. They do so, even when
the sun is not shining.
► Never disconnect the solar modules
when the solar inverter is powered.
► First switch off the grid connection
so that the solar inverter cannot
feed energy into the grid.
► Turn the AC/DC isolating switch to
position OFF.
► Make sure the DC connections can-
not be accidentally touched.
WARNING
High electrocution
When you remove the cover from the
fuse section, protection degree is no
longer IP65.
► Remove the cover only when it is
really necessary.
► Do not remove the cover when it is
raining and the inverter is wet.
► Close the cover tightly after work.
● The solar inverter can be safely and normally
operated if installed and used in accordance with
this manual (see IEC 62109-5.3.3). Delta Energy
Systems is not responsible for damage incurred
by failure to observe the installation and operating instructions in this manual. For this reason, be
sure to observe and follow all instructions!
● Installation and commissioning may only be per-
formed by qualied electricians using the installation and commissioning instructions found in this
manual.
● The solar inverter must be disconnected from
power and the solar modules before any work on
it can be performed.
● The solar inverter has a high leakage current
value. The ground wire must be connected before
commissioning.
● Do not remove any warning signs that the manu-
facturer has installed on the solar inverter.
● Improper handling of the solar inverter may result
in physical injury and damage to property. For
this reason, observe and follow all general safety
instructions and warnings.
● The solar inverter contains no components that
must be maintained or repaired by the operator or
installer. All repairs must be performed by Delta
Energy Systems. Opening the cover will void the
warranty.
● Do not disconnect any cables when the solar
inverter is powered due to risk of a fault arc.
● To prevent lightning strikes, follow the relevant
regulations applicable in your country.
● The surface of the solar inverter can become very
hot during operation. Use safety gloves when
working on the solar inverter.
● The solar inverter is very heavy. The solar inverter
must be lifted and carried by at least three people.
● Only devices in compliance with SELV
(EN 69050) may be connected to the RS485 and
USB interfaces.
● All connections must be sufciently insulated in
order to comply with the IP65 protection rating.
Unused connections must be closed by placing
cover caps on the solar inverter.
Installation and Operation Manual for RPI M50A
7
3. Intended use
3. Intended use
The solar inverter may only be used as intended.
Proper use of the solar inverter meets the following
criteria:
● Use in stationary PV systems connected to the
local power grid for converting the direct current in
the PV system to alternating current and feeding it
into the grid
● Use within the specied power range (see
“13 Technical data”, p. 105) and under the
specied ambient conditions (see “5 Planning the
installation”, p. 18).
Any of the following uses of the solar inverter is considered improper:
● Isolated operation. The solar inverter has anti-
islanding and other monitoring features.
● Use in mobile PV systems.
8
Installation and Operation Manual for RPI M50A
3. Intended use
Installation and Operation Manual for RPI M50A
9
4. Product overview
Europe
4. Product overview
4.1 Scope of delivery
Part Qty Image/Description Part Qty Image/Description
Inverter 1
DC bus bar 2 Used when the solar mod-
ules have to be grounded
and for connecting the
two DC inputs to one MPP
tracker.
Mounting plate 1 DC Fuse holder 1 Used when the solar mod-
ules have to be grounded.
AC plug 1 China Aviation Optical-
Electrical Technology Co.
PVE5T125KE36
Screw for
grounding the
inverter housing
1 An appropriate screw with
washer, washer spring
and toothed ring is already
mounted to the inverter
DC plugs 10 Multi-Contact MC4 plug for
DC+ (32.0017P0001-UR for
2
4/6 mm
)
10 Multi-Contact MC4 plug for
DC– (32.0016P0001-UR for
4/6 mm2)
Quick Installation Guide and
General Safety
Instructions
1
Installation and Operation Manual
RPI M50A
10
Installation and Operation Manual for RPI M50A
4.2 Components and connectors
2
4. Product overview
1
2
3
4
5
No. Component / connector Description
Display, buttons, status LEDs See “4.3 Display, buttons, status LEDs”, p. 12
1
String fuses and AC/DC overvoltage protection
Air inlets See “4.5 Air inlets and fans”, p. 13
3
Electrical connectors See “4.6 Electrical connectors”, p. 14
4
Fans See “4.5 Air inlets and fans”, p. 13
5
Type label See “4.7 Information on the type label”, p. 17
6
See “4.4 String fuses and AC/DC surge protection
device”, p. 12
6
Installation and Operation Manual for RPI M50A
11
4. Product overview
GrID
AlArm
4.3 Display, buttons, status LEDs
Alarm
Grid
ESC ENT
Label Designation Usage
LEDs
Buttons
ESC
ENT
Grid Green; lights up when the inverter feeds into the grid
Alarm Red; indicates and error, fault, or warning
Escape Exit current menu. Cancel value setting.
Move down Move downwards in menu. Set value (decrease).
Move up Move upwards in menu. Set a value (increase).
Enter
Select menu item. Open con gurable value for editing. Finish editing
(adopt set value).
4.4 String fuses
The RPI M50A is equipped with string fuses on the
DC side.
Type
Manufacturer Littelfuse
Part number 0SPF015.T
12
Rate current 15 A
Rate voltage 1000 V
or
Manufacturer Hollyland
Part number 10GPV15UO
Rate current 15 A
Rate voltage 1000 V
Installation and Operation Manual for RPI M50A
4. Product overview
4.5 Surge protection devices
4.5.1 AC side
The M50A_120 additionally has surge protection
devices type 2 on the AC and the DC side.
Type
Manufacturer GEHE
Part number GPU1-C40/690
Voltage U
Current I
Current I
Voltage U
C
n
max
P
690 V
AC
15 kA (8/20)
30 kA (8/20)
≤ 2.5 kV
4.6 Air inlets and fans
Air is intaken from the environment through the air
inlets on the upper left and upper right side of the
inverter. The air is used to cool the inverter. The
warmed-up air is ejected at the fans on the bottom
side of the inverter.
For a detailed description of the cooling principle, see
“5.3 Ambient conditions and air circulation”, p. 19.
For a detailed description how to clean or replace the
fans, see “11. Maintenance”, p. 95.
4.5.2 AC side
The M50A_120 additionally has surge protection
devices type 2 on the AC and the DC side.
Type
Manufacturer GEHE
Part number GPU1-ZS1000*
Voltage U
Current I
Current I
Voltage U
C
n
max
P
1120 V
DC
20 kA (8/20)
40 kA (8/20)
≤ 3.9 kV
Installation and Operation Manual for RPI M50A
13
4. Product overview
4.7 Electrical connectors
4.7.1 Overview
1 2 3 4
+– +– +– +–
DISCONN.
AC/DC
ON
DC 1 DC 2
AC OUTPUT DC INPUT
OFF
6 5
Fig. 4.1: Overview electrical connectors
No. Component / connector Description
AC/DC disconnection switch See “4.6.2 AC/DC disconnection switch”, p. 15
1
2
AC connector (AC output) See “4.6.3 AC connector (AC output)”, p. 15
DC connectors (DC inputs) See “4.6.4 DC connectors (DC inputs)”, p. 15
3
Communication port 1 See “4.6.5 Communication port 1”, p. 15
4
COMM.
Communication port 2 See “4.6.6 Communication port 2”, p. 16
5
Grounding screw See “4.6.7 Grounding connection”, p. 16
6
14
Installation and Operation Manual for RPI M50A
4. Product overview
+– +– +– +–
+–
4.7.2 AC/DC disconnection switch
OFF ON
DISCONN AC/DC
The inverter is disconnected from the grid (AC) and
the solar modules (DC) when the AC/DC disconnec-
tion switch is in position OFF.
OFF ON
DISCONN AC/DC
4.7.4 DC connectors (DC inputs)
DC 1 DC 2
DC INPUT
The DC connectors (DC inputs) are used for connecting inverter to the solar module string(s).
Connector type:
● Multi-contact MC4
● 10 pairs with female socket for DC+ and male
socket for DC–.
● 10 pairs of plugs are delivered with the inverter
For technical specications, see “13. Technical data”,
p. 105.
4.7.5 Communication port 1
The inverter is connected to the grid (AC) and the
solar modules (DC) when the AC/DC disconnection
switch is in position ON.
4.7.3 AC connector (AC output)
DISCONN.
AC/DC
ON
AC OUTPUT
OFF
The AC connector is used for connecting the inverter
to the grid.
Usage of the AC connection:
● Feeding AC current into the grid.
● Powering up the display when no DC voltage is
available via the DC connectors (DC inputs).
The inverter can be connected to:
COMM.
Functions of Communication port 1:
● 1 x RS485 in/out (e.g. for connecting to a datalog-
ger)
● 6 x Digital inputs (e.g. for connecting to a ripple
receive controller)
● 2 x Dry contacts (e.g. for connecting to an exter-
nal relais)
● 1 x VCC contacts (e.g. for connecting to an exter-
nal relais)
For a detailed description, see “6.7 Connecting com-
munication port I (optional)”, p. 45.
● 5-wire grid sytems 3P4W (L1, L2, L3, N, PE)
● 4-wire grid systems 3P3W (L1, L2, L3, PE).
AC plug type:
China Aviation Optical-Electrical Technology Co.
PVE5T125KE36
The AC plug is delivered with the inverter.
Installation and Operation Manual for RPI M50A
15
4. Product overview
+–
DISCONN.
4.7.6 Communication port 2
COMM.
Communication port 2 is not available on this inverter.
4.7.7 Grounding connection
AC/DC
The grounding connection is used for grounding the
housing of the inverter.
The grounding screw (M6) with washer spring,
washer and toothed ring is already mounted to the
inverter.
For a detailed description, see “6.3 Grounding the
inverter housing”, p. 39.
16
Installation and Operation Manual for RPI M50A
4.8 Information on the type label
Fig. 4.2: RPI M50A_120 type label Fig. 4.3: RPI M50A_122 type label
Information on type label Description
This inverter has no transformer.
Risk of death by electrocution
Potentially fatal voltage is present when the inverter is in operation that remains for
10 seconds after being disconnected from power.
10 s
Never open the inverter. The inverter contains no components that must be maintained or repaired by the operator or installer. Opening the cover will void the warranty.
4. Product overview
Read the manual delivered with the inverter before working with the inverter and
follow the instructions contained in the manual.
The housing of the inverter must be grounded if this is required by local regulations.
DC Input
200-1000Vdc DC input voltage range
MPPT 520-800Vdc MPP input voltage range with full power (with symmetrical load)
1000Vdc Maximum DC input voltage
50A*2 max. Maximum DC input current per DC input (50 A for each DC input)
Isc: 60A*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-wire systems (3 phases + PE) and 4-wire sys-
tems (3 phases + N + PE)
50/60 Hz AC Nominal frequency
50kW nom. Nominal active power
55kW/55kVA Maximum active/reactive power
80A max. Maximum AC current
cos φ 0.8 ind ~ 0.8 cap Range of cos φ
IP Code: IP65 (Electronics) Protection degree for the electronics according to EN 60529
Protective Class: I Safety class according to EN 61140
AC Over voltage category: III AC overvoltage category according to IEC 62109-1
Installation and Operation Manual for RPI M50A
17
5 Planning the installation
?
?
?
?
✔
✘ ✘
5. Planning the installation
NOTE
This chapter is for planning the installation only and is not related to do any
real actions.
Some of the actions can be dangerous. Chapter “6. Installation”, p. 37
describes all actions and the possibly
related risks in detail.
5.1 Where to mount the solar inverter
Fig. 5.2: Where to mount the inverter 2
► Mount the solar inverter so that the LEDs and dis-
play can be easily seen and that the buttons can
be operated. Make sure the reading angle and
installation height are sufcient.
74 kg
Fig. 5.1: Where to mount the inverter 1
► The solar inverter is very heavy. The solar inverter
must be lifted and carried by at least three people.
► Always use the mounting plate supplied with the
solar inverter.
► Check that the wall is capable of bearing the
heavy load of the device.
► Use dowels and screws that are suitable for the
wall material and the heavy weight.
► Mount the solar inverter on a vibration-free wall to
avoid disruptive vibrations.
► Possible noise emissions can be disruptive when
the device is used in living areas or in buildings
with animals. Therefore, choose your installation
location carefully.
Fig. 5.3: Mounting orientation
► Mount the solar inverter vertically.
18
Installation and Operation Manual for RPI M50A
5 Planning the installation
5.2 Outdoor installations
Fig. 5.4: Outdoor installations
► The solar inverter has protection degree IP65 and
can be installed indoors or in protected outdoor
areas (that means outdoor but protected by a roof
against direct sun, rain or snow).
5.3 Ambient conditions and air circulation
>20 cm
>30 cm>30 cm >30 cm
>80 cm
Fig. 5.5: Mounting distances and air circulation
► Ensure adequate air circulation. Hot air must be
able to dissipate downward. Keep enough space
around each inverter.
► Do not install inverters directly above one another.
Otherwise, the lower inverter is warmed up by the
upper one.
► Consider the operating temperature range (see
“13. Technical data”, p. 105).
When the operating temperature range is exceeded, the solar inverter reduces the amount of power
generated.
Installation and Operation Manual for RPI M50A
Fig. 5.21: Air fl ow around solar inverter
19
5 Planning the installation
5.4 Temperature derating curves
P/P
(Pn = 50 kW)
n
115%
110%
105%
100%
95%
90%
S [VA] = P [W]
800 V
600 V
520 V
DC
DC
DC
85%
80%
75%
70%
65%
60%
55%
50%
25 30 35 40 45 50 55 60
Ambient temperatures [°C]
Fig. 5.6: Temperature derating curve (cos φ = 1.0)
20
Installation and Operation Manual for RPI M50A
P/P
Ambient temperatures [°C]
(Pn = 50 kW)
n
115%
110%
105%
100%
95%
90%
85%
5 Planning the installation
P [W]S [VA]
800 V
600 V
520 V
DC
DC
DC
800 V
600 V
520 V
DC
DC
DC
80%
75%
70%
65%
60%
55%
50%
25 30 35 40 45 50 55 60
Fig. 5.7: Temperature derating curve (cos φ = 0.95)
Installation and Operation Manual for RPI M50A
21
5 Planning the installation
Ambient temperatures [°C]
P/P
(Pn = 50 kW)
n
115%
110%
105%
99%
95%
90%
85%
800 V
600 V
520 V
DC
DC
DC
P [W]S [VA]
800 V
DC
600 V
DC
520 V
DC
80%
75%
70%
65%
60%
55%
50%
25 30 35 40 45 50 55 60
Fig. 5.8: Temperature derating curve (cos φ = 0.90)
22
Installation and Operation Manual for RPI M50A
5.5 Efciency curve
Efficiency
100%
99%
98%
97%
96%
95%
94%
5 Planning the installation
800 V
DC
600 V
DC
520 V
DC
93%
92%
15 2050 10 25 30 35 40 45 50
Power [kW]
Fig. 5.9: Efciency curve
Installation and Operation Manual for RPI M50A
23
5 Planning the installation
5.6 Dimensions
107
30
31
158.7
172.8
25
82
Fig. 5.10: Dimensions of mounting plate
612 278
460
Fig. 5.11: Dimensions of inverter
740
24
Installation and Operation Manual for RPI M50A
5 Planning the installation
G N L1 L3L2
N
L1
L2
L3
PE
To solar inverter AC
plug
5.7 AC connection
Always adhere to the specic regulations applicable in
your country or region.
Always adhere to the specic regulations dened by
your grid operator.
For the safety of the user and for the security of your installation, install required safety and protection devices that
are applicable for your installation environment (example:
automatic circuit breaker and/or overcurrent protection
equipment).
Use the proper upstream circuit breaker to protect the
inverter:
Model Upstream Circuit Breaker
RPI M50A 100 A
2
NOTE
The value of the tripping current mainly
depends on the quality of the solar
modules, the size of the PV array and
environmental conditions (e.g. humidity). The tripping current of the residual
current device must not be less than
the specied minimum tripping current.
Permitted earthing systems
Earthing
System
Permitted Yes Yes Yes Yes No
AC grid voltage requirements
3P3W 3P4W
L1-L2 400 V
L1-L3 400 V
L2-L3 400 V
TN-S TN-C TN-C-S TT IT
± 20% L1-N 230 VAC ± 20%
AC
± 20% L2-N 230 VAC ± 20%
AC
± 20% L3-N 230 VAC ± 20%
AC
Fig. 5.12: Where to place upstream circuit breakers
in the system
The inverter is not capable of feeding in DC residual currents due to its design. It fullls this requirement in accordance with DIN VDE 0100-712.
The possibilities of faults were examined by Delta
without taking the integrated RCMU (residual-current
monitoring unit) into account. When examining
these faults in terms of the current valid installation
standards, no danger in combination with a type A
upstream residual-current device (RCD) can occur.
Therefore faults that would otherwise require the use
of a type B residual-current device due to the inverter
can be excluded.
The integrated all-pole sensitive RCMU is certied
according VDE 0126 1-1/A1:2012-02 §6.6.2 for a tripping current of 300 mA. RCD Type A can be used for
this inverter, according to the following table.
M50A
Minimum tripping current of the
mA ≥300
RCD
Installation and Operation Manual for RPI M50A
25
5 Planning the installation
5.8 DC connection
NOTICE
Machine and equipment damage may occur.
Exceeding the maximum current per DC input can cause an overheating of the DC inputs.
► Always consider the maximum current of the DC inputs when planning the installation.
5.8.1 Symmetrical and asymmetrical power input
The inverter operates using two separate MPP trackers that can handle both symmetrical and asymmetrical
power input. This allows you to set up complex PV system designs. For example: east/west-facing roof (asymmetric load) or a south facing roof such as a dormer (asymmetrical load).
Total
East Roof
West Roof
kW
East West
8:00 13:00 18:00
Fig. 5.13: Concept of 2-MPP-tracker system for asymmetrical power input
The following gures explain how symmetrical and asymmetrical power input is handled:
Symmetrical power input Asymmetrical power input
Input Current
I
max
Max. Power MPPT Range
Input Current
I
max
Max. Power MPPT Range
26
U
startup
U
max
U
startup
Input Voltage
Input Current DC 1 Input Current DC 2
Input Current DC 1 Input Current DC 2
Fig. 5.14: I-U curve for symmetrical and asymmetrical power input (schematic diagrams)
Installation and Operation Manual for RPI M50A
U
max
Input Voltage
5 Planning the installation
COMM.
For currents and voltages see “13. Technical data”, p. 105.
5.8.2 Use with solar modules that do not need to be grounded.
When you use PV modules that do not need to be
grounded, you can connect the DC inputs separately
or in parallel.
“Separate DC inputs” means each DC input is connected to a separate MPP tracker. “Parallel DC
inputs” means both DC inputs are connected to one
MPP tracker. With parallel DC inputs you cannot realize asymmetrical power inputs.
PV arrays can be connected to the inverter directly or externally parallel connection at DC distribution box.
PV array
AC wiring
3P3W 3P4W
1 - L1
2 - L2
3 - L3
4 - N
1 - L1
2 - L2
3 - L3
- PE
5 - PE
DISCONN.
AC/DC
ON
OFF
DC wiring
+– +– +– +–
DC 1 DC 2
AC OUTPUT DC INPUT
Fig. 5.15: System design with fl oating DC inputs
Separate or
parallel DC inputs
Installation and Operation Manual for RPI M50A
27
5 Planning the installation
5.8.3 Use with solar modules that have to be grounded.
NOTICE
Machine and equipment damage
may occur.
► When the DC inputs are grounded,
all of the strings must be connected
in parallel and then connected to
the inverters.
► Additionally, an external isolation
transformer must be installed on
the AC side, otherwise, damage will
result and the inverter will not work
properly.
When the DC inputs are grounded, all of the strings
must be connected in parallel and then connected to
the inverter(s).
When the solar modules need to be grounded, an
external isolation transformer has to be implemented
to the AC side of the PV system as shown in Fig.
5.16, p. 28.
Depending on the DC connection type, different settings for insulation detection are needed, see “8.7
Insulation mode and insulation resistance”, p. 59.
You have to prepare the inverter for use with
grounded solar modules, see Fig. 5.17, p. 29 and
Fig. 5.18, p. 30. Because you have to remove the
cover of the fuse section, you should do this before
you hang the inverter on the wall and do it in a dry
environment. For a detailed description how to do
this, see “6.5 Connecting to the solar modules (DC)”,
p. 42.
PV array
AC wiring
3-phase, 230/400 V
star or delta connection
Isolated
transformer
Inverter
230/400 V
3P3W 3P4W
1 - L1
2 - L2
3 - L3
4 - N
5 - PE
Utility
OFF
AC
1 - L1
2 - L2
3 - L3
- PE
ON
AC
Distribution Box
+
–
+– +– +– +–
DC wiring
Positive grounding
Z
Negative grounding
Z
Parallel DC inputs only
28
DISCONN.
AC/DC
AC OUTPUT DC INPUT
DC 1 DC 2
COMM.
Fig. 5.16: System design with positive or negative grounding of the solar modules
Installation and Operation Manual for RPI M50A
1 x
5 Planning the installation
DC1+
DC2+
1 x
+
Grounding fuse (1 A)
Fig. 5.17: Preparing the inverter for use with minus grounded solar modules
Fuse holder and DC bus bars are delivered with the inverter. The screws are already fastened
inside the inverter. You have to provide a grounding fuse with 1 A.
DC1-
DC bus barFuse holder
DC2-
Installation and Operation Manual for RPI M50A
Installation and Operation Manual for RPI M50A
29
29
5 Planning the installation
1 x
DC1+
DC2+
2 x
+
Grounding fuse (1 A)
Fig. 5.18: Preparing the inverter for use with plus grounded solar modules
Fuse holder and DC bus bars are delivered with the inverter. The screws are already fastened
inside the inverter. You have to provide a grounding fuse with 1 A.
DC1-
DC bus barsFuse holder
DC2-
30
30
Installation and Operation Manual for RPI M50A
Installation and Operation Manual for RPI M50A
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