Huawei SUN2000-15KTL-50KTL-M3 Series User manual

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
6 Electrical Connections
Issue 01 (2021-04-05)
Copyright © Huawei Technologies Co., Ltd.
64
Figure 6-22 Network port signal definition
Figure 6-23 Signal cable definitions of the terminal block
Figure 6-24 COM port
Scenario Where No Signal Cable Is Connected

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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If no signal cable is connected to the SUN2000, use a waterproof plug to block the cable hole
of the signal cable connector and connect the signal cable connector to the communications
port on the SUN2000 to improve the waterproof performance.
Figure 6-25 Connecting the signal cable connector
6.3.2.1 Communication Modes
RS485 Communication
Figure 6-26 SmartLogger networking
It is recommended that the number of SUN2000s connected to each RS485 route be less than 30.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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MBUS communication
The MBUS is a communication mode in which communication signals are loaded to power
cables through the communications board for transmission.
The built-in MBUS module in the SUN2000 does not need to be connected to cables.
6.3.2.2 (Optional) Connecting the RS485 Communications Cable to the
SUN2000
Prerequisites
If the signal cables are long enough to connect to the communications port on the SUN2000,
you do not need to install anAC adapter box.
Procedure
Step 1 If the original signal cable is connected through RJ45 network ports, cut off the RJ45
connectors.
Figure 6-27 Cut off the RJ45 connectors
Step 2 Connect the signal cable to the signal cable connector.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
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Figure 6-28 Connecting the cable
Step 3 Connect the signal cable connector to the COM port.
Figure 6-29 Securing the signal cable connector
----End
6.3.2.3 (Optional) Connecting the Signal Transfer Cable
Prerequisites
If the signal cables are not long enough to connect to the inverter communications port,
connect a signal transfer cable.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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Figure 6-30 Terminal block in theAC adapter box
（1）Inverter
（2）Customer
Table 6-1 Signal definitions of the terminal block in theAC adapter box
Port
Reser
ved
RS485-1
RS485-2
Ripple Control
Inverter
-
A1-1
A1-2
A2
DIN1
DIN3
GND
-
B1-1
B1-2
B2
DIN2
DIN4
-
Customer
-
B-IN
B-OUT
B2
DIN2
DIN4
-
-
A-IN
A-OUT
A2
DIN1
DIN3
GND

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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Issue 01 (2021-04-05)
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Figure 6-31 Pin definitions
Pin
Definition
Function
Pin
Definition
Function
1
485A1_1
RS485 differential signal
+
2
485A1_2
RS485 differential
signal +
3
485B1_1
RS485 differential signal
–
4
485B1_2
RS485 differential
signal –
5
-
-
6
-
-
7
485A2
RS485 differential signal
+
8
DIN1
Dry contact for power
grid scheduling
9
485B2
RS485 differential signal
–
10
DIN2
11
-
-
12
DIN3
13
-
-
14
DIN4
15
-
-
16
GND
Procedure
Step 1 Remove the two security Torx screws from the maintenance compartment door using a
security Torx wrench.

Replacing SUN2000-(15KTL-50KTL) Series with
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Issue 01 (2021-04-05)
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Figure 6-32 Opening theAC adapter box
Step 2 Route the signal conversion cable and user-side signal cable through the COM port at the
bottom of the AC adapter box.
Figure 6-33 Routing the signal cable
Step 3 Connect one end of the signal conversion cable to the COM port of the inverter.

Replacing SUN2000-(15KTL-50KTL) Series with
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Figure 6-34 Connecting the signal conversion cable
Step 4 Connect the other end of the signal conversion cable to the terminal block.
Figure 6-35 Connecting the signal conversion cable
Step 5 Connect the user-side signal cable to the terminal block.
Figure 6-36 Connecting the user-side signal cable
Step 6 Secure the terminal block in the AC adapter box, and connect the PE wires of the signal
conversion cable and the user-side signal cable.

Replacing SUN2000-(15KTL-50KTL) Series with
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Figure 6-37 Secure the terminal block
----End
6.3.3 Installing the AC Output Power Cable
Precautions
An AC switch must be installed on the AC side of the SUN2000 to ensure that the SUN2000
can be safely disconnected from the power grid.
Do not connect loads between the SUN2000 and the AC switch.
Use a socket wrench and extension rod to connect theAC power cable. The extension rod
must be longer than 150 mm.
Do not install third-party devices in the AC connection box.
There are two rows of AC terminals in the AC adapter box. The lower row is used to connect the AC
transfer cable between the AC adapter box and the SUN2000, and the upper row is used to connect the
AC output power cable on the user side.
Procedure
Step 1 Connect the AC transfer cable to the AC terminals in the lower row of the AC adapter box.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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Issue 01 (2021-04-05)
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Figure 6-38 Connecting theAC transfer cable
Step 2 Remove the AC terminal box and install partition boards.
Figure 6-39 Removing theAC terminal box
Step 3 Route the AC transfer cable through the AC wiring terminal.

Replacing SUN2000-(15KTL-50KTL) Series with
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Figure 6-40 Routing theAC power cable
Step 4 Connect the AC transfer cable to the SUN2000.
Figure 6-41 Connecting theAC transfer cable
Step 5 Select an appropriate rubber liner based on the cable outer diameter.

Replacing SUN2000-(15KTL-50KTL) Series with
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Figure 6-42 Selecting an appropriate rubber liner
Step 6 Connect the AC output power cable on the user side (using a five-core cable as an example).
Figure 6-43 Connecting theAC power cable
Step 7 Install the AC terminal cover and close the door of the adapter box.

Replacing SUN2000-(15KTL-50KTL) Series with
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Figure 6-44 Installing theAC terminal cover
----End
6.3.4 Installing DC Input Power Cables
Precautions
Before connecting the DC input power cables, ensure that the DC voltage is within the
safe range (lower than 60 V DC) and that the DC switch on the SUN2000 is OFF. Failing
to do so may result in electric shocks.
When the SUN2000 is running, it is not allowed to work on the DC input power cables,
such as connecting or disconnecting a PV string or a PV module in a PV string. Failing to
do so may cause electric shocks.
If no PV string connects to a DC input terminal of the SUN2000, do not remove the
watertight cap from the DC input terminals. Otherwise, the IP rating of the SUN2000 will
be affected.
Ensure that the following conditions are met. Otherwise, the SUN2000 may be damaged, or
even a fire may occur.

Replacing SUN2000-(15KTL-50KTL) Series with
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PV modules connected in series in each PV string are of the same specifications.
The DC input voltage of the SUN2000 shall not exceed 1100 V DC under any
circumstance.
The polarities of electric connections are correct on the DC input side. The positive and
negative terminals of a PV string connect to the corresponding positive and negative DC
input terminals of the SUN2000, respectively.
If the DC input power cables are reversely connected, do not operate the DC switch as
well as positive and negative connectors immediately. Wait until the solar irradiance
declines at night and the PV string current reduces to below 0.5 A, and then turn off the
DC switch and remove the positive and negative connectors. Correct the PV string polarity
before reconnecting the PV string to the SUN2000.
The SUN2000 does not support power supplies other than PV strings. Since the output of
the PV string connected to the SUN2000 cannot be grounded, ensure that the PV module
output is well insulated to ground.
During the installation of PV strings and the SUN2000, the positive or negative terminals
of PV strings may be short-circuited to ground if the power cables are not properly
installed or routed. In this case, an AC or DC short circuit may occur and damage the
SUN2000. The caused device damage is not covered under any warranty.
In the spare part replacement scenario, the DC input power cables can be connected only
to PV1–PV6. If the DC input power cables are connected to PV7 or PV8, the inverter data
cannot be transmitted to the northbound device.
Figure 6-45 DC input terminals
When the DC input is not fully configured, the DC input terminals must meet the following
requirements:
1. Evenly distribute the DC input power cables on the four MPPTs and preferentially
connect them from MPPT 1 to MPPT 4.
2. Maximize the number of connected MPPTs.
Number
of PV
Strings
Terminal Selection
Number
of PV
Strings
Terminal Selection
1
Connects to any route.
2
PV1, PV7
3
PV1, PV3, PV7
4
PV1, PV3, PV5, PV7
5
PV1, PV2, PV3, PV5, PV7
6
PV1, PV2, PV3, PV5, PV7,
PV8

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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Issue 01 (2021-04-05)
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Number
of PV
Strings
Terminal Selection
Number
of PV
Strings
Terminal Selection
7
PV1, PV2, PV3, PV4, PV5,
PV7, PV8
8
PV1, PV2, PV3, PV4, PV5,
PV6, PV7, PV8
Procedure
Before connecting DC input power cables, ensure that the original DC terminals have been
cut off. If the original DC connector is directly connected to the
SUN2000-(15KTL-50KTL)-M3 series, the inverter may be burnt.
You are advised to use the PV-CZM-22100 (Staubli) crimping tool and do not use it with
the positioning block. Otherwise, the metal terminals may be damaged.
The PV-MS (Staubli) or PV-MS-HZ (Staubli) open-end wrench is recommended.
Cables with high rigidity, such as armored cables, are not recommended as DC input
power cables, because poor contact may be caused by the bending of the cables.
Before assembling DC connectors, label the cable polarities correctly to ensure correct
cable connections.
After the positive and negative connectors snap into place, pull the DC input power cables
back to ensure that they are connected securely.
Use the positive and negative Staubli MC4 metal terminals and DC connectors delivered with
the SUN2000. Using incompatible positive and negative metal terminals and DC connectors
may result in serious consequences. The caused device damage is not covered under any
warranty or service agreement.
Step 1 Cut off the original DC terminals.
Figure 6-46 Cut off the original DC terminals
Step 2 Connect the DC power cables.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
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Issue 01 (2021-04-05)
Copyright © Huawei Technologies Co., Ltd.
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Figure 6-47 Connecting DC power cables
If the original DC input power cables are not long enough, use the DC input extension cables delivered
with the package.
Figure 6-48 Connecting the DC inputextension cable
----End
6.3.5 (Optional) Installing the WLAN-FE Smart Dongle
Procedure
If the original SUN2000 uses the FE communication mode, you need to install the WLAN-FE
Smart Dongle for the SUN2000 connected to the monitoring device after the replacement.
Use the RS485 communication mode for other SUN2000s.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
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Figure 6-49 Networking diagram before the replacement
Figure 6-50 Networking diagram after the replacement
Step 1 Install the WLAN-FE Smart Dongle.
Figure 6-51 Installing the WLAN-FE Smart Dongle
The WLAN-FE Smart Dongle is not provided in standard configuration.
Install the network cable before installing the Smart Dongle on the SUN2000.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
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For details about how to use the WLAN-FE Smart Dongle SDongleA-05, see SDongleA-05 Quick Guide
(WLAN-FE). The quick guide is delivered with the Smart Dongle. You can also scan the QR code to
obtain the documentation.
----End

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
7 Commissioning
Issue 01 (2021-04-05)
Copyright © Huawei Technologies Co., Ltd.
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7 Commissioning
7.1 Checking Before Power-On
Table 7-1 Checklist
No.
Check Item
Acceptance Criteria
1
SUN2000 installation
The SUN2000 is installed correctly and
securely.
2
Smart Dongle
The Smart Dongle is installed correctly and
securely.
3
Cable routing
The cables are routed properly as required
by the customer.
4
Cable ties
Cable ties are evenly distributed and no burr
exists.
5
Reliable grounding
The PE cable is connected correctly and
securely.
6
Switch
DC switches and all the switches connecting
to the SUN2000 are OFF.
7
Cable connection
The AC output power cable, and DC input
power cables are connected correctly and
securely.
8
Unused terminals and ports
Unused terminals and ports are locked by
watertight caps.
9
Installation environment
The installation space is proper, and the
installation environment is clean and tidy.

Replacing SUN2000-(15KTL-50KTL) Series with
SUN2000-(15KTL-50KTL)-M3 Series
User Manual
7 Commissioning
Issue 01 (2021-04-05)
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7.2 System Power-On
Prerequisites
Before turning on theAC switch between the SUN2000 and the power grid, check that the
AC voltage is within the specified range using a multimeter.
If the DC power supply is connected but theAC power supply is disconnected, the
SUN2000 will report a Grid Loss alarm. The SUN2000 can start properly only after the
power grid recovers.
Procedure
Step 1 Turn on the AC switch between the SUN2000 and the power grid.
Step 2 (Optional) Remove the locking screw beside the DC switch.
Figure 7-1 Removing the locking screw beside the DC switch
Step 3 Turn on the DC switch at the bottom of the SUN2000.
Step 4 Observe the LED indicators to check the operating status of the SUN2000.
Table 7-2 Indicator description
Category
Status
Description
Running indicator
LED1
LED2
–
Steady green
Steady green
The SUN2000 is
operating in grid-tied
mode.
Blinking green
slowly (on for 1s and
off for 1s)
Off
The DC is on and the
AC is off.
Blinking green
slowly (on for 1s and
off for 1s)
Blinking green
slowly (on for 1s and
off for 1s)
Both the DC and AC
are on, and the
SUN2000 is not
supplying power to
the power grid.