Sunny Tripower Core1: Technical Information
Sunny Tripower Core1: Technical Information
Sunny Tripower Core1: Technical Information
Table of Contents
1 Introduction................................................................................................................................... 3
2 Basic Information ......................................................................................................................... 3
3 Requirements................................................................................................................................ 4
4 Installation .................................................................................................................................... 5
5 Commissioning and Testing......................................................................................................... 6
6 Event Messages............................................................................................................................ 8
7 Frequently Asked Questions ....................................................................................................... 8
8 Appendix ...................................................................................................................................... 9
1 Introduction
SMA Solar Technology AG will release a new firmware version for the Sunny Tripower CORE1 in August 2019. This
considerably simplifies the grid and PV system protection required by the application guide VDE-AR-N 4105. For PV
systems with Sunny Tripower CORE1 (> 30 kW to 135 kW), this means it is now possible to replace the external tie
switch for disconnection from the grid with the disconnection units already integrated into the inverter. Additional costs
for the external tie switch can therefore be omitted.
This technical information describes, in addition to the basic principles, the necessary steps and requirements for
implementing integrated grid and PV system protection in PV systems with Sunny Tripower CORE1 for installers and
system planners.
2 Basic Information
The grid and PV system protection is a "type-tested protective device with a certificate of compliance" as per
application guide VDE-AR-N 4105. This type-tested protective device with a certificate of compliance constantly
monitors the voltage and frequency of the transmission line for compliance with the specified tolerances and prevents
the formation of stand-alone grids.
For generating systems < 30 kW, the grid and PV system protection that is integrated into the inverters as standard is
sufficient in Germany. For generating systems > 30 kW, however, external grid and PV system protection is required.
Here it is absolutely necessary that an external monitoring unit with an integrated system protection relay is
implemented. Whereas for systems up to 135 kW, the tie switch that disconnects the PV system from the utility grid
does not necessarily have to be implemented externally, provided the standard requirements are complied with. Thus,
the external grid and PV system protection consists of two components:
• Monitoring unit with a grid and system protection relay
• Tie switch that is switched via the system protection relay of the monitoring unit and disconnects the PV system in
the event of a grid failure.
Up until now, when using a Sunny Tripower CORE1, the tie switch had to be realized externally, i.e. outside the
inverter. Consequently, additional costs of up to €2,000 were incurred, depending on the size of the system.
AC
Control cable
As the the Sunny Tripower CORE1 already includes redundant and monitored switching elements for disconnection
from the utility grid, these can now be connected to the system protection relay of the external monitoring unit
electrically by making appropriate changes in the firmware of the inverter and providing an interface (use of the
optional SMA I/O module (MD.IO-40)). Thus, the tie switch prescribed by applicable standards is implemented in the
inverter. The expensive external tie switch can therefore be omitted in the future.
AC
Control cable
Figure 2: PV system with tie switch integrated in the inverter.
SMA Solar Technology AG provides a corresponding manufacturer's declaration for download regarding the use of
the internal tie switch of the Sunny Tripower CORE1 for the above-mentioned application.
3 Requirements
The following requirements must be met to be able to use the function:
• The Sunny Tripower CORE1 must be equipped with firmware version ≥ 3.01.00.R. The function can be upgraded
for inverters that have already been delivered. A manufacturer's declaration is available for download on the
product page at www.SMA.de.
• All Sunny Tripower CORE1 devices in a system must be equipped with an SMA I/O-Module (MD.IO-40),
available as an accessory.
• As before, the system must contain a certified monitoring unit (e.g. Ziehl, Bender or similar) with an integrated
potential-free system protection relay. The alarm contact must be a break contact.
• Connection cable:
– Conductor cross-section: 0.5 mm² to 0.75 mm²
– UV resistance required
– Maximum cable length: 200 m (between inverter and grid and PV system protection)
4 Installation
Only the most important installation steps are shown here. Observe the manuals of the installed components. The
following figure shows the pin assignment scheme of the I/O Module (MD.IO-40) that must be installed in all
Sunny Tripower CORE1 devices.
B1 B2 B3 B4 B1 = 24 V
B2 = digital input 1
B3 = digital input 2
B4 = digital input 3
A1 = 24 V
A2 = digital input 4
A3 = digital input 5
A1 A2 A3 A4 A4 = digital input 6
Figure 3: Pin assignment of the SMA I/O Module
Pin A4 and Pin A1 (+24 V) are provided for connection to the system protection relay of the external monitoring unit
(break contact). Observe that the digital input signals in SMA communication devices (e.g. SMA Data Manager,
Sunny Portal) are marked DI1 to DI6. Figure 3 shows the reference of pin to digital input. The following figure shows
a wiring example including two Sunny Tripower CORE1 devices with installed SMA I/O Module and system
protection relay of the monitoring unit.
B1
B2 System protection relay
B3 of the monitoring unit
B4 (Grid and PV system protection)
A1
A2
A3
A4
Figure 4: Wiring example for grid and PV system protection without active power setpoint
In order to use the grid and system protection function for several devices, each inverter must be equipped with its own
SMA I/O module. In addition to grid and PV system protection, it is also possible to implement an active power
setpoint for the entire system (4 digital inputs) via an I/O module. The wiring scheme is shown in the following figure.
Sunny Tripower CORE1
with SMA I/O Module 1 Ripple control receiver
B1
B2 K1
B3
B4 K2
A1
A2 K3
A3
A4 K4
Figure 5: Wiring example for grid and PV system protection with active power setpoint
In the use case show here, with forwarding of the signal to reduce active power, the inverters are connected via
Speedwire (Ethernet). In this case, the ripple control receiver for setting the active power setpoint only has to be
connected directly to one inverter's SMA I/O Module. In this case, the curtailment signals are forwarded via the
existing Speedwire communication to the inverters, which are connected to each other via the network.
Figure 6: Activating the grid and PV system protection in the installation assistant
Procedure:
1. Access the user interface.
2. Start the installation assistant.
3. Select [Save and continue] until the step Grid management service.
4. Select the field On in the Active power setpoint section under Grid and PV system protection via SMA I/O
Module.
Figure 7: Activating the grid and PV system protection in the Device parameters menu
Procedure:
• Select Device parameters > System and device control > Power control modules > Grid and PV system
protection and enable the On button.
Disconnection test
• To test the disconnection of the system, interrupt the signal cables for external grid and PV system protection or
trigger a disconnection test via the external monitoring unit.
6 Event Messages
When the grid and system protection function is enabled, the inverter can generate the following event messages:
Event number Message and Cause
10513 GMS fast stop: Stop through PV system control is executed
This event is generated by the monitoring relay of the monitoring unit when the grid and PV
system protection device is triggered. The inverter disconnects from the utility grid.
7622 No communication with the I/O module
This event is displayed during a device-internal communication error with the SMA I/O Mod-
ule. For safety reasons, the inverter disconnects from the utility grid.
Under which country settings can the simplified grid and PV system protection be implemented?
This function is available for all country data sets ≥ 2018, e.g. DE VDE-AR-N4105:2018-11 Generators >
4.6 kVA. The country data set can be set via the user interface of the inverter or via the SMA Data Manager in
Sunny Portal.
Can the grid and PV system protection also be implemented by an Ethernet connection between
the inverters?
No. The grid and PV system protection always requires a separate line due to safety reasons as well as 1 SMA I/O
Module per inverter.
Can the integrated grid and PV system protection also be used in mixed systems, e.g. with other
Sunny Tripower inverters?
No. The implementation of simplified grid and PV system protection is currently approved only for the Sunny Tripower
CORE1 in conjunction with the SMA I/O Module (MD.IO-40).
Does a feedback contact for the grid and PV system protection has to be implemented?
No. There is no need for additional feedback because the tie switch in the inverter is already monitored internally.
Is an additional voltage supply required, for example, during dynamic grid support?
No. The Sunny Tripower CORE1 provides an AC- and DC-supplied 24 V output voltage via the SMA I/O Module for
reading the system protection relay of the external grid and PV system monitoring unit. The external monitoring unit
usually contains a wide-range power supply unit that supplies the monitoring unit with sufficient power even with
dynamic grid support.
Can an SMA I/O Module also be used for active power supply in parallel to grid and PV system
protection?
Yes. For this, the SMA I/O Module can be used (see Section 4 "Installation", page 5).
Can cable lengths > 200 m also be implemented between the monitoring unit and the inverter?
Yes. There is a simple implementation with an additional relay in the communication line. In the appendix, you will find
an application example from Ziehl.
8 Appendix
The following application example shows how the simplified grid and PV system protection is implemented with
Sunny Tripower CORE1 and an external monitoring unit from Ziehl (ZIEHL industrie-elektronik GmbH + Co KG,
https://www.ziehl.com/en/AllProducts/detail/UFR1001E-54, 2019-12-06).
A1 A2 I1 Q1 Q2 Q3 Q4 Q5 12 11 14 22 21 24 distance
~ ~ + >>
+ Us – U> U< f> f< << VSR
≂ 24...270 V K1 K2 with coupling relay 24-240V
+Err
≤ DC27V/20mA
www.ziehl.de Test 10)
UFR1001E >2 s
Time
11) 7)
6)
Enable/
Standby/ 5)
4) FRE/RCR
in +24VDC out
5) A4 A1
L1 ~
L2
L3
N =
SMA CORE1 / MD.IO-40