Delta RPI-M8 User manual

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Contents
Section Description Page
1. General Information...............................................................................6
1.1 About this Manual..........................................................................6
1.2 General Warnings / Notes on Safety.............................................6
1.3 Validity ............................................................................................7
1.4 Product Description.......................................................................7
1.5 How it Works ..................................................................................8
1.6 Additional Information...................................................................8
2. Installation and Wiring ..........................................................................9
2.1 Instruction before Installation.......................................................9
2.2 Unpacking.......................................................................................9
2.3 Package Inspection......................................................................10
2.4 Identify of Inverter........................................................................10
3. Product Overview ................................................................................11
3.1 Dimension.....................................................................................11
3.2 Function Introduction..................................................................12
3.2.1 LCD Display and Buttons....................................................12
3.2.2 Inverter Input / Output Interface.........................................13
4. Installation............................................................................................14
4.1 Installing Location .......................................................................14
4.2 Mounting.......................................................................................14
5. Wiring....................................................................................................18
5.1 Preparation before Wiring...........................................................18
5.2 AC Grid Connection: 3-Phase+PE or 3-Phase+N+PE ...............20
5.2.1 Required Protective Devices and Cable Cross-sections .20
5.3 DC Connection (from PV Array)..................................................24
5.4 Communication Module Connections........................................26
5.4.1 RS-485 Connection..............................................................26
5.4.2 EPO Functions.....................................................................28
5.4.3 Dry Contact Connection......................................................28
6. Active / Reactive Power Control and Fault Ride Through................29
6.1 Active Power Control...................................................................29
6.1.1 Power Limit ..........................................................................29
6.1.2 Power vs. Frequency...........................................................30
6.2 Reactive Power Control...............................................................31
6.2.1 Fixed Active Factor cosφ ....................................................31

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6.2.2 Active Factor cosφ(P) .........................................................31
6.2.3 Fixed Reactive Power..........................................................32
6.2.4 Reactive Power / Voltage Characteristic Q(U)...................32
6.3 Fault Ride Through (FRT)............................................................33
7. Turn on/off PV inverter........................................................................35
7.1 Home Page ...................................................................................37
7.2 LCD Flow Chart............................................................................37
7.2.1 Power Meter .........................................................................37
7.2.2 Energy Log...........................................................................38
7.2.3 Event Log .............................................................................38
7.2.4 Operation Data.....................................................................39
7.2.5 Inverter Information.............................................................39
7.2.6 Settings ................................................................................40
7.2.6.1 Personal Setting......................................................40
7.2.6.2 Coefficient Setting ..................................................41
7.2.6.3 Installation Settings................................................41
7.2.6.4 Active/Reactive Power Control..............................44
7.2.6.4.1 Power Limit ...............................................45
7.2.6.4.2 Power vs. Frequency................................45
7.2.6.4.3 Constant cosφ...........................................46
7.2.6.4.4 cosφ(P) ......................................................46
7.2.6.4.5 Constant Reactive Power.........................47
7.2.6.4.6 Q(U)............................................................47
7.2.6.5 FRT (Fault ride through).........................................48
8. Maintenance.........................................................................................49
8.1 Clean Fan......................................................................................49
8.2 Replace Fan..................................................................................50
8.3 Clean Air Outlets..........................................................................50
9. Measurement, Error message and Trouble Shooting.......................51
9.1 Measurement................................................................................51
9.2 Error Message & Trouble Shooting............................................54
10. De-Commissioning..............................................................................60
10.1De-Commissioning Procedure....................................................60
11. Technical Data......................................................................................61
11.1 Specification.................................................................................61

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Figure
Section Description Page
Figure 1-1 Solar system operation illustration.................................................8
Figure 2-1 Unpacking process........................................................................9
Figure 2-2 Wooden case unpacking process..................................................9
Figure 2-3 The identification label.................................................................10
Figure 3-1 Dimension of RPI-M8/ M10/ M12/ M15A/ M20A..........................11
Figure 3-2 Dimension of RPI-M15/ M20/ M30...............................................11
Figure 3-3 Inverter exterior objects ...............................................................12
Figure 3-4 LCD display and control panel.....................................................12
Figure 3-5 Input/Output interfaces of M8/ M10/ M12/ M15A/ M20A..............13
Figure 3-6 Input/Output interfaces of M15/ M20/ M30...................................13
Figure 3-7 Air outlet illustration .....................................................................13
Figure 4-1 Screw the mounting bracket ........................................................15
Figure 4-2 Correct and incorrect installation illustration ................................16
Figure 4-3 Proper installation gap.................................................................17
Figure 5-1 Connection of a system for floating DC inputs.............................18
Figure 5-2 Connection of system with positive/negative ground...................19
Figure 5-3 Stripping the wire.........................................................................21
Figure 5-4 AC plug illustrationfor M8/ M10/ M12/ M15/ M15A/ M20/ M20A. .22
Figure 5-5 AC plug illustration for M30..........................................................23
Figure 5-6 DC Wiring illustration ...................................................................25
Figure 5-7 Communication module...............................................................26
Figure 5-8 Multi-inverter connection illustration ............................................27
Figure 5-9 Dry contact port & Assignments...................................................28
Figure 6-1 Power vs. frequency characteristic..............................................30
Figure 6-2 cosφ(P) characteristic..................................................................31
Figure 6-3 Q(U) characteristic.......................................................................32
Figure 6-4 Borderlines of the voltage profile of a type-2 generating plant at the
network connection point ..............................................................................34
Figure 6-5 FRT characteristic........................................................................34
Figure 7-1 LCD display &control panel .........................................................35
Figure 7-2 Select county page ......................................................................36
Figure 7-3 Select language page..................................................................36
Figure 7-4 Home page..................................................................................37
Figure 7-5 Menu page...................................................................................37

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Figure 7-6 Power meter page .......................................................................37
Figure 7-7 Energy log flow chart ...................................................................38
Figure 7-8 Event log flow chart .....................................................................38
Figure 7-9 Operation data flow chart.............................................................39
Figure 7-10 Inverter information page...........................................................39
Figure 7-11 Setting page...............................................................................40
Figure 7-12 Personal setting page................................................................40
Figure 7-13 Coefficient setting page .............................................................41
Figure 7-14 Install setting page –User mode ................................................42
Figure 7-15 Insulation setting........................................................................42
Figure 7-16 Install setting page –Installer mode ..........................................42
Figure 7-17 Grid setting page .......................................................................43
Figure 7-18 Active/Reactive powersetting page............................................44
Figure 7-19 Power limit setting page.............................................................45
Figure 7-20 Power vs. frequency setting page..............................................45
Figure 7-21 Constant cosφ setting page.......................................................46
Figure 7-22 cosφ(P) setting page .................................................................46
Figure 7-23 Constant Reactive Power setting page......................................47
Figure 7-24 Q(U) setting page ......................................................................47
Figure 7-25 FRT setting page .......................................................................48
Figure 8-1 dissembling fan connections........................................................49
Figure 8-2 disassembling fan overview.........................................................50
Figure 8-3 Disassembling fan .......................................................................50
Figure 8-4 Disassembling air outlets.............................................................50

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Table
Section Description Page
Table 2-1 Packing list....................................................................................10
Table 5-1 Recommended upstream protection .............................................20
Table 5-2 Wire size of AC input.....................................................................20
Table 5-3 The wiring system of the inverter...................................................23
Table 5-4 Maximum rating of input power .....................................................24
Table 5-5 Cable size .....................................................................................24
Table 5-6 Definition of RS 485 pin.................................................................26
Table 5-7 RS-485 data format.......................................................................27
Tabel 5-8 Terminal resister setting ................................................................27
Tabel 5-9 EPO functions ...............................................................................28
Table 7-1 LED indicator.................................................................................36
Table 7-2 Grid setting parameters.................................................................43
Table 9-1 Measurement and message..........................................................51
Table 9-2 Error Message...............................................................................54
Table 9-3 Warning Message .........................................................................55
Table 9-4 Fault Message...............................................................................56
Table 11-1 Specification for RPI-M8/ M10/ M12............................................61
Table 11-2 Specification for RPI-M15/ M20/ M30..........................................64
Table 11-3 Specification for RPI-M15A/ M20A ..............................................67

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1. General Information
1.1 About this Manual
Congratulations on the purchase of your Delta RPI-M8/ M10/ M12/ M15/ M15A/
M20/ M20A/ M30 grid-tied solar inverter. This manual will assist you in becoming
familiar with this product. Please observe all safety regulations and take into
account technical connection conditions required at your local grid utility.
1.2 General Warnings / Notes on Safety
Careful handling of the product will contribute to service life durability and
reliability. Both are essential to ensure maximum yield from your product. As
some of the solar inverter models are heavy, two people may be required for
lifting purposes.
CAUTION！
During operation of electrical devices, certain parts are under
dangerous voltage.
Inappropriate handling can lead to physical injury and material
damage.
Always adhere to the installation regulations. Installation may
only be conducted by certified electricians.
WARNING！
Repair work on the device should ONLY be carried out by the
manufacturer. No user serviceable parts inside.
Please observe all points in the operation and installation manual.
Isolate the device from the grid and the PV modules before
undertaking work on the device.
DANGER！
To avoid risk of electrical shock, do not open the solar inverter.
The inverter contains no internal user-serviceable parts. Opening
the inverter will void the warranty.
Dangerous voltage is present for 5 minutes after disconnecting all
sources of power.
Remember that the unit has a high leakage current. The PE
conductor MUST be connected prior to commencing operation.

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WARNING：BURN HAZARD
The unit may reach very high temperatures and the device
surface can become quite hot. Sufficient cooling time is
necessary for optimal yield.
1.3 Validity
This user manual describes the installation process, maintenance, technical data
and safety instructions of the following solar inverter models under the DELTA
brand.
◆RPI-M8 ◆RPI-M10 ◆RPI-M12
◆RPI-M15 ◆RPI-M15A ◆RPI-M20
◆RPI-M20A ◆RPI-M30
1.4 Product Description
This device is a 3-phase grid-tied solar inverter. It converts direct current (DC)
electricity from the PV array into 3-phase alternating current (AC) which feeds
the excess generated power back to the local grid.
This inverter allows for a wide voltage range (200~1000V) and has a high
performance efficiency and user friendly design and operation. Please note these
devices do not support off-grid functionality.
The features for RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/ M30 are shown
below.
Features
Power Rating：8/ 10/ 12/ 15/ 20/ 30 kVA
3Phase, Grid-tie, Transformerless solar inverter
Maximum efficiency：> 98 %
Europe efficiency: >97.5%
Reactive power capability (Cap 0.8 –Ind 0.8)
Low output current harmonic distortion (THD < 3%) @ full load
2 MPP Trackers
Record up to 30 event logs.
5” LCD display

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1.5 How it Works
The operation of solar inverter is shown as the figure 1-1. In order to save energy
and electricity, solar inverter convert the DC input power supplied from the PV
Array into 3-phase AC output power to Grid.
PV Array Electrical Grid
Solar Inverter
DC Distribution
box
3PH AC Distribution
box
Surge arrestor
Fuse
DC switch
Surge arrestor
AC breaker
3 phase, N, PE
E-Today: 47kWh 21.Jun201013:50
Runtime:8.2Hrs Power:12103W
OnGrid,Derating, cosφ–Ind 0.9
20
15
10
5
04 8 12 16 20 24
Figure 1-1 Solar system operation illustration
1.6 Additional Information
For more detailed information for RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/
M30 or other related product information, please visit http://www.deltaww.com.

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2. Installation and Wiring
2.1 Instruction before Installation
Due to the variety of users and installation environments, it is recommended to
read this manual thoroughly before installation. Installation of the unit and
start-up procedures must be carried out by accredited technicians.
2.2 Unpacking
Unpacking process for RPI-M8/ M10/ M12/ M15A/ M20A is shown as Figure 2-1.
a. b. c.
Figure 2-1 Unpacking process
Unpacking process for RPI-M15/ M20/ M30 is shown as Figure 2-2.
5
4
6
123
a. b. c.
Figure 2-2 Wooden case unpacking process

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2.3 Package Inspection
Unforeseeable events causing damage or movement may occur during shipment.
Please check for damage on the wooden carton upon receiving your inverter.
Please check the model number and the serial number on the packaging is
identical with the model number and serial number on the unit itself.
Check if all the accessories are in the package, the standard accessories are list
as Table 2-1:
Table 2-1 Packing list
RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/ M30
Object
Qty
Description
PV Inverter
1
RPI-M8/ M10/ M12/ M15/ M15A/ M20/
M20A/ M30 solar inverter
User Manual
1
The Instruction to provide the information
of safety, Installation, specification, etc.
AC Plug
1
Connector for AC connection
Mounting Bracket
1
Wall mounting bracket to mount the solar
inverter on the wall
Caution: If there is any visible damage to the inverter/accesories or any
damage to the packaging, please contact your inverter supplier.
2.4 Identify of Inverter
Users can identify the model number by the information on the product label. The
model number, specification and the series No. is specified on the product label.
Regard to the label location, please refer to the figure 2-3.
RPI-M15/ M20/ M30RPI-M8/ M10/ M12 RPI-M15A/ M20A
Figure 2-3 The identification label

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3. Product Overview
3.1 Dimension
Top view
Front view Side view Back view
Bottom view
326 [12.8]
198 [7.8]
278 [10.9]
612 [24.1]
625 [24.6]
RPI-M8/ M10/ M12 RPI-M15A/ M20A
Figure 3-1 Dimension of RPI-M8/ M10/ M12/ M15A/ M20A
Top view
Front view Side view Back view
RPI-M30RPI-M20 / RPI-M15 Bottom view
331 [13.0]
203 [8.0]
278 [10.9]
960 [37.8]
612 [24.1]
931 [36.6]
260 [10.2]
Figure 3-2 Dimension of RPI-M15/ M20/ M30

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3.2 Function Introduction
The Inverter’s exterior objects are shown in Figure 3-3. The detailed description
can be found in sections 3.2.1 and 3.2.2.
LCD/LED Display
and Buttons
DC Connectors
AC Connectors
Communication
Connetions
DC Switch
Air outlets
Label
DC Switch
AC Connectors
Communication
Connetions
LCD/LED Display
and Buttons
Air outlets
RPI-M15/ M20/ M30 RPI-M8/ M10/ M12/
M15A/ M20A
Label
DC Connectors
Fan*4
Fan*1 or 2
Figure 3-3 Inverter exterior objects
3.2.1 LCD Display and Buttons
EXIT: Exit Menu
UP: Move Up
Down: Move Down
LCD Display ENT: Enter Menu or Confirm
LED Indicator (GRN/RED)
Figure 3-4 LCD display and control panel

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3.2.2 Inverter Input / Output Interface
Communication
-RS-485 *2
-EPO *2
-Dry Contact *2
DC1 DC2
RPI-M8/ M10/ M12/ M15A/ M20A
Fan*1 or 2
AC Connector
230/400Vac, 3Ph DC Switch
String1
String2
String3
String4
Figure 3-5 Input/Output interfaces of M8/ M10/ M12/ M15A/ M20A
AC Connector
230/400Vac, 3Ph
Fan *4
DC1 DC2
RPI-M30
DC1 DC2
RPI-M15/ M20
DC Switch
String1
String2
String3
String4
String1
String2
String3
String4
String5
String6
Communication
-RS-485 *2
-EPO *2
-Dry Contact *2
Figure 3-6 Input/Output interfaces of M15/ M20/ M30
Figure 3-7 Air outlet illustration

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4. Installation
4.1 Installing Location
WARNING！
Do not install the unit near or on flammable surfaces.
Please mount the unit tightly on a solid/smooth surface.
CAUTION！
The unit should not be installed in a direct sunlight.
4.2 Mounting
This unit is designed to be wall-mounted. Please ensure the installation is
perpendicular to the wall and the AC plug at the base of the unit. Do not install
the device on a slanting wall. The dimensions of the mounting bracket are shown
in the figure below. There are 12pcs of M6 screws required for mounting plate.
Fix the supplied wall-mount plate securely on the wall before attaching the
inverter onto the mounting plate.
Back view
331 [13.0]
203 [8.0]
931 [36.6]
260 [10.2]
326 [12.8]
198 [7.8]
Back view

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M6 Screw M6 Screw
M6 Screw *6
Wall
M6 Screw *6 > 125cm
> 70cm > 80cm > 80cm
Inverter #1 Inverter #2
Figure 4-1 Screw the mounting bracket

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90
Figure 4-2 Correct and incorrect installation illustration
CAUTION！
◆The bracket supplied with the unit is specially designed and
should be the only mounting device used for the unit.
◆It is recommended to install the inverter in a suitable location
which offers non-obscured and safe access, in turn ensuring
easy access for service and maintenance.
◆Please leave an appropriate gap in between units when
installing several solar inverter systems.
◆Please install solar inverter at an eye level to allow easy
observation for operation and parameter setting.
◆Ambient temperature -20°C~60°C.(power derating above
40°C)
◆It is essential to ensure sufficient space for product operation
as shown in Figure 4-3.

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> 60 CM
> 60 CM
> 60 CM
> 60 CM
> 60 CM
Figure 4-3 Proper installation gap

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5. Wiring
5.1 Preparation before Wiring
1. Ensure voltage values and polarities are correct.
2. When grounding the solar array, an isolation transformer is required due to
the RPI-series not having galvanic isolation between the DC-input and
AC-output.
3. The ground fault detection is a fixed internal setting. It cannot be modified.
4. Whole system wiring and connections can be seen in Figure 5-1 and 5-2.
5. Inverter can accept DC inputs in parallel (1 MPP tracker/2 parallel inputs).
6. Different DC connection type needs different settings of insulation detection.
About setting, please refer to 7.2.6.3 Install Setting.
1
2
3
4
L1
L2
L3
N
PE
Communication
Wiring
1
2
3
PV Array
AC Wiring
DC Wiring
Parallel or
Separate
DC Distribution box
DC1 DC2
*
* Some models can support 3P3W
system, please refer to table 5-3.
Figure 5-1 Connection of a system for floating DC inputs

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Isolated
transformer
Utility To
Inverter
3Ph,
400Vac 3Ph,
400Vac
Must be Parallel
Connection
PV Array
DC Distribution box
(Plus-GND or Minus-GND)
Z
Z
or
Must install a
transformer
Some models can support 3P3W
system, please refer to table 5-3.
Figure 5-2 Connection of system with positive/negative ground
WARNING！SHOCK HAZARD
Note: Whenever a PV array is exposed to sunlight, a shock hazard
may exist due to output wires or exposed terminals. To reduce the
risk of shock during installation, cover the array with an opaque
(dark) material and ensure that the Disconnect Device in the
inverter is set to OFF before commencing any wiring.