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 Safety Symbol & Instruction .........................................................6
1.3 Validity ............................................................................................6
1.4 Product Description.......................................................................7
1.5 Features..........................................................................................7
1.6 Application& Usage .......................................................................7
1.7 Additional Information...................................................................8
2. Installation and Wiring ..........................................................................8
2.1 Instruction before Installation.......................................................8
2.2 Check Package...............................................................................8
2.3 Unpacking.......................................................................................9
2.4 Identify of Inverter........................................................................10
3. Product Overview ................................................................................10
3.1 Exterior Objects ...........................................................................10
3.2 Dimension.....................................................................................11
3.3 Inverter Input/Output Interface....................................................12
3.4 LCD Display and Buttons............................................................13
3.5 Air Outlet.......................................................................................13
4. Installation............................................................................................14
4.1 Installing Location .......................................................................14
4.2 Mounting.......................................................................................14
5. Wiring....................................................................................................17
5.1 Preparation before Wiring...........................................................17
5.2 AC Grid Connection: 3P3W+PE or 3P4W+PE............................19
5.2.1 Required Protective Devices and Cable Cross-sections .19
5.3 DC Connection (from PV Array)..................................................22
5.4 Communication Module Connections........................................23
5.4.1 RS-485 Connection..............................................................23
5.4.2 EPO Functions.....................................................................25
5.4.3 Dry Contact Connection......................................................25
6. Active / Reactive Power Control and Fault Ride Through................25
6.1 Active Power Control...................................................................26
6.1.1 Power Limit ..........................................................................26

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6.1.2 Power vs. Frequency...........................................................26
6.2 Reactive Power Control...............................................................27
6.2.1 Fixed Active Factor cosφ ....................................................27
6.2.2 Active Factor cosφ(P) .........................................................28
6.2.3 Fixed Reactive Power..........................................................28
6.2.4 Reactive Power / Voltage Characteristic Q(U)...................28
6.3 Fault Ride Through (FRT)............................................................29
7. Turn on/off PV inverter........................................................................31
7.1 Home Page ...................................................................................33
7.2 LCD Flow Chart............................................................................33
7.2.1 Power Meter .........................................................................33
7.2.2 Energy Log...........................................................................34
7.2.3 Event Log .............................................................................34
7.2.4 Operation Data.....................................................................35
7.2.5 Inverter Information.............................................................35
7.2.6 Settings ................................................................................36
7.2.6.1 Personal Setting......................................................36
7.2.6.2 Coefficient Setting ..................................................37
7.2.6.3 Install Setting ..........................................................37
7.2.6.4 Active/Reactive Power Control..............................40
7.2.6.4.1 Power Limit ...............................................41
7.2.6.4.2 Power vs. Frequency................................41
7.2.6.4.3 Constant cosφ...........................................42
7.2.6.4.4 cosφ(P) ......................................................42
7.2.6.4.5 Constant Reactive Power.........................43
7.2.6.4.6 Q(U)............................................................43
7.2.6.5 FRT (Fault ride through).........................................44
8. Maintenance.........................................................................................44
8.1 Clean Fan......................................................................................45
8.2 Replace Fan..................................................................................46
8.3 Clean Air Outlets..........................................................................46
9. Measurement, Error message and Trouble Shooting.......................47
9.1 Measurement................................................................................47
9.2 Error Message & Trouble Shooting ............................................50
10. De-Commissioning..............................................................................55
10.5De-Commissioning Procedure....................................................55
11. Technical Data......................................................................................56
11.1 Specification.................................................................................56

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Figure
Section Description Page
Figure 1-1 Solar inverter system operation illustration....................................7
Figure 2-1 Carton unpacking process.............................................................9
Figure 2-2 Wooden case unpacking process..................................................9
Figure 2-3 The identification label.................................................................10
Figure 3-1 Inverter exterior objects...............................................................10
Figure 3-2 Dimension of RPI-M8/ M10/ M12/ M15A/ M20A..........................11
Figure 3-3 Dimension of RPI-M15/ M20/ M30...............................................11
Figure 3-4 Input/Output interfaces of M8/ M10/ M12/ M15A/ M20A..............12
Figure 3-5 Input/Output interfaces of M15/ M20/ M30...................................12
Figure 3-6 LCD display and control panel.....................................................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 system if DC inputs are floating............................18
Figure 5-2 Connection of system with Positive Ground or Negative Ground 18
Figure 5-3 AC plug illustrationfor M8/ M10/ M12/ M15/ M15A/ M20/ M20A. .20
Figure 5-4 AC plug illustration for M30..........................................................21
Figure 5-5 DC Wiring illustration...................................................................23
Figure 5-6 Communication module...............................................................23
Figure 5-7 Multi-inverter connection illustration ............................................24
Figure 5-8 Dry contact port & Assignments...................................................25
Figure 6-1 Power vs. frequency characteristic..............................................27
Figure 6-2 cosφ(P) characteristic..................................................................28
Figure 6-3 Q(U) characteristic.......................................................................28
Figure 6-4 Borderlines of the voltage profile of a type-2 generating plant at the
network connection point ..............................................................................30
Figure 6-5 FRT characteristic........................................................................30
Figure 7-1 LCD display &control panel .........................................................31
Figure 7-2 Select county page......................................................................32
Figure 7-3 Select language page..................................................................32
Figure 7-4 Home page..................................................................................33
Figure 7-5 Menu page...................................................................................33
Figure 7-6 Power meter page .......................................................................33

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Figure 7-7 Energy log flow chart...................................................................34
Figure 7-8 Event log flow chart .....................................................................34
Figure 7-9 Operation data flow chart.............................................................35
Figure 7-10 Inverter information page...........................................................35
Figure 7-11 Setting page...............................................................................36
Figure 7-12 Personal setting page................................................................36
Figure 7-13 Coefficient setting page.............................................................37
Figure 7-14 Install setting page –User mode ................................................38
Figure 7-15 Insulation setting........................................................................38
Figure 7-16 Install setting page –Installer mode ..........................................38
Figure 7-17 Grid setting page.......................................................................39
Figure 7-18 Active/Reactive powersetting page............................................40
Figure 7-19 Power limit setting page.............................................................41
Figure 7-20 Power vs. frequency setting page..............................................41
Figure 7-21 Constant cosφ setting page.......................................................42
Figure 7-22 cosφ(P) setting page .................................................................42
Figure 7-23 Constant Reactive Power setting page......................................43
Figure 7-24 Q(U) setting page ......................................................................43
Figure 7-25 FRT setting page.......................................................................44
Figure 8-1 Steps of disassembling fan bracket.............................................45
Figure 8-2 Disassembling fan .......................................................................46
Figure 8-3 Disassembling air outlets.............................................................46

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Table
Section Description Page
Table 2-1 Packing list......................................................................................8
Table 5-1 Recommended upstream protection .............................................19
Table 5-2 Wire size ofAC input.....................................................................19
Table 5-3 The wiring system of the inverter...................................................21
Table 5-4 Maximum rating of input power .....................................................22
Table 5-5 Cable size .....................................................................................22
Table 5-6 Definition of RS 485 pin.................................................................24
Table 5-7 RS-485 data format.......................................................................24
Tabel 5-8 Terminal resister setting ................................................................24
Tabel 5-9 EPO functions...............................................................................25
Table 7-1 LED indicator.................................................................................32
Table 7-2 Grid setting parameters.................................................................39
Table 9-1 Measurement and message..........................................................47
Table 9-2 Error Message...............................................................................50
Table 9-3 Warning Message .........................................................................51
Table 9-4 Fault Message...............................................................................52
Table 11-1 Specification for RPI-M8/ M10/ M12............................................56
Table 11-2 Specification for RPI-M15/ M20/ M30..........................................58
Table 11-3 Specification for RPI-M15A/ M20A..............................................60

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!
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1. General Information
1.1 About this Manual
This manual provides the detail information of specification, installation
procedures and all related function setting about the solar inverter model
RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/ M30. Installation technicians must
be well-trained and qualified for installing solar system and must follow all the
safety instruction and installation procedures.
1.2 Safety Symbol & Instruction
CAUTION！
Machine and equipment damage may occur if not avoid the
hazardous situation
WARNING！
Death and serious injuries may occur if not avoid the hazardous
situation
DANGER！
Death and serious injuries will occur if not avoid the hazardous
situation
WARNING：BURN HAZARD
The enclosure temperature may exceed over 70° C while
operating. Danger may occur owing to hot surface. Please do not
touch!
1.3 Validity
This user manual describes the installation procedures, maintenance, technical
data and safety instruction of the following solar inverter models under DELTA
brand.
◆RPI-M8 ◆RPI-M10 ◆RPI-M12
◆RPI-M15 ◆RPI-M15A ◆RPI-M20
◆RPI-M20A ◆RPI-M30

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1.4 Product Description
The “RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/ M30” is a 3 phase grid-tied
solar inverter. This device converts direct current (DC) electricity from
photovoltaic power collected from PV Array into 3 phase alternating current (AC)
to feed the excess capacity back to the local mains electrical grid. Using of
cutting-edge technology allows wide voltage input range (200~1000V) and high
performance efficiency based on user friendly operation design. In addition,
special DSP (Digital Signal Processor) design decreases the circuit complication
and electronic component. Please note that this device does not support off-grid
function. The following are the features of RPI-M8/ M10/ M12/ M15/ M15A/ M20/
M20A/ M30.
1.5 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
1.6 Application& Usage
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 three-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. Jun 2010 13:50
Runtime:8.2Hrs Power:12103W
OnGrid,Derating, cosφ–Ind0 .9
20
15
10
5
04 8 12 16 20 24
Figure 1-1 Solar inverter system operation illustration

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1.7 Additional Information
For more detail information of RPI-M8/ M10/ M12/ M15/ M15A/ M20/ M20A/ M30
or other related product information, please visit the website at
http://www.deltaww.com for more support.
2. Installation and Wiring
2.1 Instruction before Installation
Due to the variety of user’s installation environment, reading thoroughly on this
before installation is strongly recommended. All the installation and start-up
procedures must be undertaken by professional and well-trained technician.
2.2 Check Package
There might be some unpredictable situation during transportation. Please check
if there is any damage on the package. After open the package, please check
both outer case and inner part of this inverter as below.
Check the right side on the inverter case to ensure the model number and the
specification is the same with the model you purchased previously.
1. Check if there is any loose component.
2. Check if all the accessories are in the package, the standard accessories are
list as below table:
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: When there is any outer or inner damage on inverter or any
incompleteness or damages on the packaged accessories, please contact
your inverter supplier.

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2.3 Unpacking
Unpacking process for RPI-M8/ M10/ M12/ M15A/ M20A.
1. Open the carton (see Figure 2-2a).
2. Remove the cover on the inner box (see Figure 2-2b).
3. Lift Inverter (see Figure 2-2c).
a. b. c.
Figure 2-1 Carton unpacking process
Unpacking process for RPI-M15/ M20/ M30.
1. Unscrew the 6 screws (see Figure 2-1a for the locations).
2. Lift the cover of box (see Figure 2-1b).
3. Lift Inverter (see Figure 2-1c).
5
4
6
123
a. b. c.
Figure 2-2 Wooden case unpacking process

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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
3. Product Overview
3.1 Exterior Objects
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 3-1 Inverter exterior objects

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3.2 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 3-2 Dimension of RPI-M8/ M10/ M12/ M15A/ M20A
Top view
Front view Side view Back view
RPI-M30RPI-M20 / RPI-M15Bottom view
331 [13.0]
203 [8.0]
278 [10.9]
960 [37.8]
612 [24.1]
931 [36.6]
260 [10.2]
Figure 3-3 Dimension of RPI-M15/ M20/ M30

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3.3 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 3-4 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 3-5 Input/Output interfaces of M15/ M20/ M30

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3.4 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 3-6 LCD display and control panel
3.5 Air Outlet
Figure 3-7 Air outlet illustration

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!
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4. Installation
4.1 Installing Location
WARNING！Death and serious injuries may occur.
●Do not install the unit near/on the flammable objects.
●Do not install the unit at the location that people can entry/touch
easily.
●Please mount the unit tightly on the solid/ smooth wall.
●In order to ensure the safety of installers, installer shall be at least
two people to process the installation.
●When moving the Inverter, installer shall not stand under
machines.
CAUTION！Machine and equipment damage may occur.
●Do not install the unit at the location that directly expose to
sunlight.
4.2 Mounting
This unit is a wall-mounting system. Please ensure the installation is
perpendicular and with AC plug at the bottom. Do not install the device on a
slanting wall. The dimensions of mounting bracket are shown as the following
figures. There are 12pcs of M6 screws required for mounting plate. Fix the
supplied wall-mount plate tightly on the wall before mounting the inverter to 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
4-1-a

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

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!
90
Figure 4-2 Correct and incorrect installation illustration
CAUTION
The location and hardware should be a solid surface or a firm
holder that suitable for the weight of inverter.
Suggested to install the inverter to the location which offers free
and safe access. It would streamline the service and
maintenance
Please leave an appropriate gap in between when installing
singe/ several solar inverters.
Please install solar inverter at an eye level to allow easy
observation for operation and parameter setting.
The ambient temperature should in between -18∘C ~ 40∘C.
There shall be sufficient space for product operation as shown as the Figure 4-3.
If necessary, installer can increase the gap space for sufficient operation space.

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> 60 CM
> 60 CM
> 60 CM
> 60 CM
> 60 CM
Figure 4-3 Proper installation gap
5. Wiring
5.1 Preparation before Wiring
To avoid accidents, please confirm that the PV inverter’s power of both DC and
AC are switched off. Please confirm whether the input/output of PV inverter’s
wiring are clearly indicated. Make sure whether the value, polarity, voltage and
phase are correct.The whole system wiring is shown as in Figure 5-1 and 5-2.
Different wiring detail is described in the following paragraphs.
When DC input is floating, external transformer is not necessary. Please
refer the Figure 5-1 for the connection. Inverter can accept DC inputs in
parallel (1 MPP tracker) or separate DC input connections (2 MPP Tracker).
When DC input is positive ground or negative ground, all of the strings must
be connected in parallel and then connected to inverters. In addition, an
external isolation transformer must be installed at AC side, otherwise
damage will be caused and the inverter will not work properly.
Different DC connection type needs different settings of insulation detection.
About setting, please refer to 7.2.6.3 Install Setting.

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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 system if DC inputs are floating
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 Ground or Negative Ground

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5.2 AC Grid Connection: 3-Phase+PE or 3-Phase+N+PE
WARNING! Death and serious injuries may occur.
Before AC wiring, please ensure AC breaker is switched off.
5.2.1 Required Protective Devices and Cable Cross-sections
Please use proper upstream circuit breaker to protect the inverter.
Table 5-1 Recommended upstream protection
Model
Upstream circuit breaker
RPI-M8
20A
RPI-M10
20A
RPI-M12
30A
RPI-M15
30A
RPI-M15A
30A
RPI-M20
40A
RPI-M20A
40A
RPI-M30
60A
G N L1 L3L2
N
L1
L2
L3
PE
To solar inverter AC
plug
Please use proper wire to connect correct poles. User can refer to the following
table to select the appropriate wire.
Table 5-2 Wire size of AC input
Model
Current Rating
Wire size
Torque
Temperature
RPI-M8
40 A
5 - 8 mm2
0.7 N m
Meet UL 10070
RPI-M10
RPI-M12
RPI-M15
RPI-M15A
RPI-M20
RPI-M20A
RPI-M30
60 A
16 mm2
0.9 N m
Meet UL 10070
!