Huawei SUN2000-29.9KTL User manual

HUAWEI TECHNOLOGIES CO., LTD.
SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL)
Quick Guide
Issue: 08
Part Number: 31508547
Date: 2019-07-24

1Copyright ©Huawei Technologies Co.,Ltd.2019. All rights reserved.
1Overview
1. The information in this document is subject to change without notice. Every effort has been
made in the preparation of this document to ensure accuracy of the contents, but all statements,
information, and recommendations in this document do not constitute a warranty of any kind,
express or implied.
2. Before device installation, carefully read the SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL)
User Manual to get familiar with product information and safety precautions.
3. Only qualified and trained electrical technicians are allowed to operate the device. Operators
should understand the components and functioning of a grid-tied PV power system and be
familiar with relevant local standards.
4. Before installing the device, check that deliverables are intact and complete against the packing
list. If any damage is found or any component is missing, contact the dealer.
5. Use insulated tools when installing the device. For personal safety, wear insulation gloves and
protective shoes.
6. Huawei shall not be liable for any consequence caused by violation of the storage,
transportation, installation, and operation regulations specified in this document and the user
manual.
Ports
Waterproof cable connector is abbreviated as connector in the following text.
(1) PV connection indicator
(2) Grid-tied indicator
(3) Communication indicator
(4) Alarm/Maintenance indicator
(5) Maintenance compartment door
(6) Host panel
SUN2000 Front View
(1) Waterproof cable connector (AC OUTPUT 1)
(3) USB port (USB)
(5) DC switch 2 (DC SWITCH 2)
(7) DC input terminal (controlled by DC
SWITCH 1)
(2) Waterproof cable connectors (AC OUTPUT 2)
(4) DC switch 1 (DC SWITCH 1)
(6) Waterproof cable connectors
(COM1/COM2/COM3)
(8) DC input terminal (controlled by DC SWITCH 2)
NOTE

2
Enclosure dimensions Mounting bracket dimensions
2Installation Requirements
Installation Angle
2.1
Installation Space
2.2
Vertical Backward HorizontalUpside down Forward
For ease of installing the SUN2000
on the mounting bracket,
connecting cables to the bottom of
the SUN2000, and maintaining the
SUN2000 in future, it is
recommended that the bottom
clearance be greater than or equal
to 600 mm and less than or equal
to 730 mm.
NOTE

3
5. Install the SUN2000 on the mounting bracket. 6. Tighten the security torx screws using a
security torx wrench.
1. Remove the security torx wrench from the
mounting bracket and set it aside. 2. Mark hole positions.
3Installing the SUN2000
The SUN2000 mounting bracket has four groups of tapped holes, each group containing four
tapped holes. Mark any hole in each group based on site requirements and mark four holes in
total. Two round holes are preferred.
The SUN2000 is delivered with M12x40 screw assemblies. If the screw length does not meet
the installation requirements, prepare M12 screw assemblies by yourself and use them together
with the delivered M12 nuts.
The following describes how to support-mount the SUN2000 as an example. For details about
how to wall-mount the SUN2000, see the SUN2000-(29.9KTL, 33KTL-A, 36KTL, 42KTL) User
Manual.
4. Secure the mounting bracket.3. Drill holes. (You are advised to apply anti-rust
paint on the hole positions for protection.)
M12
45 N·m
NOTE

4
Preparations
4.1
4Electrical Connections
No.
Name
Model or Specifications
Function
1
OT terminal
M6
Connects to a ground cable.
2
OT terminal
M8
Connects to an AC output
power cable.
3
Ground cable
Outdoor copper
-core cable with a
cross
-sectional area of 16 mm2
Connects to a ground cable.
4
AC output power
cable
•
Outdoor copper-
core cable with
a cross-sectional area of 16
mm2 (for the SUN2000-
29.9KTL/33KTL-A)
•
Outdoor copper-
core cable with
a cross-sectional area of 25
mm2 (for the SUN2000-
36KTL/42KTL)
Connects to an AC output
power cable.
5
DC input power
cable
PV1
-F/4 mm2
Connects to a DC input power
cable.
6
RS485
communications
cable
Computer cable DJYP2VP2
-22
2x2x1
Connects to an RS485
communications cable over a
terminal block.
Outdoor shielded network cable
CAT 5E
Connects to an RS485
communications cable over
an
RJ45
network port.
7
FE communications
cable
Outdoor shielded network cable
CAT 5E
Connects to an Ethernet
communications cable over an
FE network port.
8
Cable tie
N/A
Binds cables.
1. Before connecting cables, ensure that all required OT terminals and cables are prepared.
Copper-core cables with copper wiring terminals are recommended. For the requirements on
the cables and terminals made of other materials, see the SUN2000-(29.9KTL, 33KTL-A,
36KTL, 42KTL) User Manual.
2. The SUN2000-42KTL supports the 3W+PE wiring mode.
3. The SUN2000-29.9KTL/33KTL-A/36KTL supports 3W+PE and 3W+N+PE wiring modes.
Connect the neutral wire if required.
NOTE

5
OT-M6
M6
5 N·m
Installing Ground Cables
4.2
Installing AC Output Power Cables
4.3
1. The outdoor copper-core cable with a cross-sectional area of 16 mm2is recommended. The
ground cable must be secured.
2. It is recommended that ground cable of the SUN2000 be connected to the nearest ground point.
For a system with multiple SUN2000s connected in parallel, connect the ground points of all
SUN2000s to ensure equipotential connections to ground cables.
3. To enhance the corrosion resistance of the ground terminal, apply silica gel or paint on it after
connecting the ground cable.
NOTE
•If you connect a ground cable to the ground point on the enclosure shell, you are recommended to
use a three-core outdoor copper-core cable with a cross-sectional area of 25 mm2as the AC
output power cable for the SUN2000-42KTL.
•If you connect a ground cable to the ground point in the maintenance compartment, you are
recommended to use a four-core outdoor copper-core cable with a cross-sectional area of 25 mm2
as the AC output power cable for the SUN2000-42KTL.
•If you connect a ground cable to the ground point on the enclosure shell in a scenario without a
neutral wire, you are recommended to use a three-core outdoor copper-core cable with a cross-
sectional area of 16 mm2as the AC output power cable for the SUN2000-29.9KTL/33KTL-A and a
three-core outdoor copper cable with a cross-sectional area of 25 mm2as the AC output power
cable for the SUN2000-36KTL.
•If you connect a ground cable to the ground point in the maintenance compartment in a scenario
without a neutral wire, you are recommended to use a four-core outdoor copper-core cable with a
cross-sectional area of 16 mm2as the AC output power cable for the SUN2000-29.9KTL/33KTL-A
and a four-core outdoor copper cable with a cross-sectional area of 25 mm2as the AC output
power cable for the SUN2000-36KTL.
NOTE
1. Never open the host panel of the SUN2000.
2. Before opening the SUN2000 maintenance compartment door, turn off the downstream AC
output switch and the two bottom DC switches.
•The ground point on the enclosure is preferred to connect to the PE cable for the SUN2000.
•The ground point in the maintenance compartment is mainly used for connecting to the ground
cable included in the multi-core AC power cable. For details, see section 4.3 "Installing AC
Output Power Cables."

6
1. Remove the two security torx screws from the
maintenance compartment door using a security
torx wrench. (Set the two screws aside. Use the
idle ground screw on the enclosure shell as the
standby screw, and the idle floating nut on the
enclosure as the standby floating nut.)
2. Open the maintenance
compartment door and adjust the
support bar. (The support bar is
bound to the enclosure base.)
3. Remove the AC terminal cover.
•If you connect a ground cable to the ground point on the enclosure shell in a scenario with a
neutral wire, you are recommended to use a four-core outdoor copper-core cable with a cross-
sectional area of 16 mm2as the AC output power cable for the SUN2000-29.9KTL/33KTL-A
and a four-core outdoor copper cable with a cross-sectional area of 25 mm2as the AC output
power cable for the SUN2000-36KTL.
•If you connect a ground cable to the ground point in the maintenance compartment in a
scenario with a neutral wire, you are recommended to use a five-core outdoor copper-core
cable with a cross-sectional area of 16 mm2as the AC output power cable for the SUN2000-
29.9KTL/33KTL-A and a five-core outdoor copper cable with a cross-sectional area of 25 mm2
as the AC output power cable for the SUN2000-36KTL.
•For more details about cable specifications, see the SUN2000-(29.9KTL, 33KTL-A, 36KTL,
42KTL) User Manual.
•The AC OUTPUT 1 connector supports the cable with an outer diameter of 18 mm to 44 mm.
NOTE

7
a. Three-core cable (excluding the ground
cable and neutral wire)
c. Four-core cable (excluding the ground
cable but including the neutral wire)
JacketInsulation layerCore wire
b. Four-core cable (including the ground cable
but excluding the neutral wire)
d. Five-core cable (including the ground cable
and neutral wire)
4. Remove the locking cap from the AC OUTPUT 1 connector and then remove the plug.
5. Select an appropriate rubber fitting based on the cable outer diameter. Route the cable through
the locking cap and then the rubber fitting.
•Mismatch between the cable outer diameter and
the rubber fitting may degrade the Ingress
Protection Rating of the device.
•To avoid damaging the rubber fitting, do not
route a cable with a crimped OT terminal directly
through the rubber fitting.
•Do not adjust the cable when the locking cap is
tightened. Otherwise, the rubber fitting will shift,
which affects the Ingress Protection Rating of
the device.
6. Remove an appropriate length of the jacket and insulation layer from the AC output power cable
using a wire stripper. (Ensure that the jacket is in the maintenance compartment.)
7. Insert the exposed core wires into the crimping area of the OT terminal and crimp them using
hydraulic pliers.
8. Wrap the wire crimping area with heat shrink tubing or PVC insulation tape.
If heat shrink tubing is used, route the AC output power cable through the heat shrink tubing and
then crimp the OT terminal. Ensure that the area wrapped by the heat shrink tubing does not
exceed the crimping area of the OT terminal.
9. Route the AC output power cable through the AC OUTPUT 1 connector at the bottom of the
enclosure.
10.Connect the AC output power cable to the AC terminal block, and then secure the connector
using a 13 mm socket wrench with an extension rod. If you connect a ground cable to the
ground point in the maintenance compartment, tighten the ground screw using a 10 mm socket
wrench with an extension rod.

8
a. 3-pin SUN2000-42KTL
(excluding the ground cable) b. 3-pin SUN2000-42KTL (including the ground cable)
M8
8 N·m
M8
8 N·m
M6
5 N·m
c. 4-pin SUN2000-42KTL (excluding the
ground cable and neutral wire) d. 4-pin SUN2000-42KTL (including the ground cable but excluding the neutral
wire)
M8
8 N·m M8 8 N·m
M6
5 N·m
e. SUN2000-29.9KTL/33KTL-A/36KTL
(excluding the ground cable and neutral wire) f. SUN2000-29.9KTL/33KTL-A/36KTL (including the ground cable but
excluding the neutral wire)
M8
8 N·m M8 8 N·m
M6
5 N·m
•Ensure that the AC output power cable is connected securely. Otherwise, the SUN2000 may fail
to operate or experience a fault that will damage the terminal block. For example, the SUN2000
may generate heat during operation due to unreliable connection.
•If the SUN2000 is insecurely installed and the AC output power cable bears the pulling force,
ensure that the last cable bearing the force is the PE cable.

9
Installing DC Input Power Cables
4.4
g. SUN2000-29.9KTL/33KTL-A/36KTL
(excluding the ground cable but
including the neutral wire)
h. SUN2000-29.9KTL/33KTL-A/36KTL
(including the ground cable and neutral wire)
M8
8 N·m M8 8 N·m
M6
5 N·m
11.Use a torque wrench with an open end of 65 mm to tighten the locking cap to a torque of 7.5 N·m,
and seal the waterproof connector.
Selecting DC input terminals
Number of Inputs
SUN2000
1
Connects to any route.
2
Connects to routes 1 and 5.
3
Connects to routes 1, 3, and 5.
4
Connects to routes 1, 3, 5, and 7.
5
Connects to routes 1, 2, 3, 5, and 7.
6
Connects to routes 1, 2, 3, 5, 6, and 7.
7
Connects to routes 1, 2, 3, 4, 5, 6, and 7.
8
Connects to routes 1, 2, 3, 4, 5, 6, 7, and 8.
The SUN2000 provides two DC switches,
namely, DC SWITCH 1 and DC SWITCH2.
DC SWITCH 1 controls the first to fourth
routes of DC input terminals, whereas DC
SWITCH 2 controls the fifth to eighth routes
of DC input terminals.
NOTE

10
1. Use the positive and negative metal contacts and DC connectors supplied with the SUN2000. Using
other models of positive and negative metal contacts and DC connectors may result in serious
consequences. The caused device damage is not covered under any warranty or service agreement.
2. The metal contacts supplied with the DC connectors are either cold forming contacts or stamping
forming contacts. Crimp the metal cold forming contacts using crimping tool UTXTC0005 (Amphenol,
recommended) or H4TC0001 (Amphenol). Crimp the metal stamping forming contacts using crimping
tool H4TC0003 (Amphenol, recommended) or H4TC0002 (Amphenol). Choose the crimping tools that
fit the metal contacts.
3. Before connecting DC input power cables, label the cable polarities to ensure correct cable
connections. If the cables are connected incorrectly, the SUN2000 may be damaged.
4. Insert the crimped metal contacts of the positive and negative power cables into the appropriate
positive and negative connectors. Then pull back the DC input power cables to ensure that they
are connected securely.
5. Connect the positive and negative connectors to the appropriate positive and negative DC input
terminals. Then pull back the DC input power cables to ensure that they are connected securely.
6. If the DC input power cable is reversely connected, do not operate the DC switches and positive
and negative connectors immediately. Otherwise, the SUN2000 will be damaged. The caused
equipment damage is beyond the warranty scope. Wait until the solar irradiance declines at night
and the PV string current reduces to below 0.5 A. Then, turn off the two DC switches, remove the
positive and negative connectors, and correct the polarity of the DC input power cable.
•Ensure that the PV module output is well insulated to ground.
•Before inserting the positive and negative connectors respectively into the positive and negative
DC input terminals of the SUN2000, check that the DC voltage does not exceed 1100 V DC
using a multimeter and that the cables are connected correctly. Otherwise, the SUN2000 will be
damaged.
Positive connector
Negative
connector
Positive metal contact
Negative metal contact
Recommended: PV cable
(PV1-F) with a cross-
sectional area of 4 mm2.
Ensure that the cable
cannot be removed after
crimped. Click
Ensure
that the
locking nut
is secured.
H4TW0001
(Amphenol)
UTXTC0005 (Amphenol)
Ensure that cables
are connected
correctly and that
the voltage does not
exceed 1100 V DC.
Installing a DC input power cable (using metal cold forming contacts)

11
Selecting a Communication Mode
4.5
1. You can choose either the MBUS (PLC) or RS485 communication mode for the SUN2000-
29.9KTL/33KTL-A/36KTL/42KTL.
2. FE communication is optional for the SUN2000-36KTL. If you need to use the FE communication
mode, contact local technical support.
3. If the SUN2000-36KTL adopts FE communication mode, it supports only RS485 and FE
communication modes, and does not support MBUS (PLC) communication mode.
Installing RS485 Communications Cables
4.6
The DJYP2VP2-22 2x2x1 computer cable or a communications cable with a cross-sectional area
of 1 mm2and outer diameter of 14–18 mm is recommended.
1. When routing communications cables, separate communications cables from power cables to
prevent communication from being affected.
2. An RS485 cable can connect to either a terminal block or an RJ45 network port. It is
recommended that the RS485 cable connect to a terminal block.
Connecting to a terminal block (recommended)
Positive connector
Negative
connector
Positive metal contact
Negative metal contact
Recommended: PV cable
(PV1-F) with a cross-
sectional area of 4 mm2.
Ensure that the cable
cannot be removed after
crimped. Click
Ensure
that the
locking nut
is secured.
H4TW0001
(Amphenol)
H4TC0003 (Amphenol)
Ensure that cables
are connected
correctly and that
the voltage does not
exceed 1100 V DC.
Installing a DC input power cable (using metal stamping forming contacts)

12
1. Remove an appropriate length of the jacket and core wire insulation layer from the
communications cable using a wire stripper.
2. Remove the locking caps from the COM1 and COM2 connectors at the SUN2000 bottom and
then remove the plugs from the caps.
3. Route the communications cables through the locking caps, and then the COM1 (RS485 IN)
and COM2 (RS485 OUT) connectors at the SUN2000 bottom.
4. Remove the terminal base from the terminal block, and connect the communications cables to
the terminal base.
No.
Port Definition
Description
1
RS485A IN
RS485A, RS485 differential
signal +
2
RS485A OUT
RS485A, RS485 differential
signal +
3
RS485B IN
RS485B, RS485 differential
signal
–
4
RS485B OUT
RS485B, RS485 differential
signal
–
5. Install the terminal base on the terminal block,
and connect the shield layer to the ground point. 6. Bind the communications cables.
7. Use a torque wrench with an open end of 33 mm to tighten the locking cap to a torque of 7.5 N·m,
and seal the waterproof connector.
When connecting the shielded cables, choose whether to crimp the OT terminal based on site
requirements.
NOTE

13
1. Insert the wires of the network cable to the
RJ45 connector in sequence.
RJ45 network port connection
You are recommended to use a CAT 5E
outdoor shielded network cable with an outer
diameter less than 9 mm and internal
resistance not greater than 1.5 ohms/10 m, as
well as a shielded RJ45 connector.
2. Crimp the RJ45 connector using a
crimping tool.
No.
Color
Pin Definition
1
White
-and-orange
RS485A, RS485 differential signal +
2
Orange
RS485B, RS485 differential signal
–
3
White
-and-green
N/A
4
Blue
RS485A, RS485 differential signal +
5
White
-and-blue
RS485B, RS485 differential signal
–
6
Green
N/A
7
White
-and-brown
N/A
8
Brown
N/A
5. Insert the RJ45 connector into the RJ45 network port
in the maintenance compartment of the SUN2000.
3. Remove the locking cap from the COM1 connector at the SUN2000 bottom and then remove
the plug from the cap.
4. Route the communications cables through the locking cap and then the COM1 connector at the
SUN2000 bottom. 6. Bind the communications cables.
7. Use a torque wrench with an open end of 33 mm to tighten the locking cap to a torque of 7.5 N·m,
and seal the waterproof connector.

14
(Optional) Installing FE Communications Cables
4.7
FEcommunication is mainly used indistributed rooftop scenarios with a smallnumber of SUN2000s. The
SUN2000 can directly connect to the PC over the Ethernet to implement monitoring networking.
1. Insert the wires of the network cable to the
RJ45 connector in sequence.
You are recommended to use a CAT 5E outdoor
shielded network cable with an outer diameter
less than 9 mm and internal resistance not
greater than 1.5 ohms/10 m, as well as a
shielded RJ45 connector.
2. Crimp the RJ45 connector using a crimping tool.
1. If FE communication is used, a maximum of ten SUN2000s can be connected. In addition, the
NetEco needs to be installed on the PC for monitoring networking.
2. A standard network cable has two wire sequence standards, namely, 568A and 568B. The
network cables used in the same PV grid-tied power generation system should comply with the
same wire sequence standard.
NOTE
No.
Color
1
White
-and-green
2
Green
3
White
-and-orange
4
Blue
5
White
-and-blue
6
Orange
7
White
-and-brown
8
Brown
a. 568A standard b. 568B standard
No.
Color
1
White
-and-orange
2
Orange
3
White
-and-green
4
Blue
5
White
-and-blue
6
Green
7
White
-and-brown
8
Brown
3. Remove the locking cap from the COM1 connector at the SUN2000 bottom and then remove
the plug from the cap.
4. Route the communications cables through the locking cap and then the COM1 connector at the
SUN2000 bottom.

15
5. Insert the RJ45 connector into the FE network
port in the maintenance compartment of the
SUN2000.
6. Bind the communications cables.
7. Use a torque wrench with an open end of 33 mm to tighten the locking cap to a torque of 7.5 N·m,
and seal the waterproof connector.
5Verifying the Installation
1.
The SUN2000 is installed correctly and securely.
Yes
▢No ▢N/A ▢
2.
The DC switches and downstream AC output switch are OFF.
Yes
▢No ▢N/A ▢
3.
Ground cables are connected correctly and securely, without open circuits
or short circuits.
Yes
▢No ▢N/A ▢
4. AC output power cables are connected correctly and securely, without open
circuits or short circuits.
Yes
▢No ▢N/A ▢
5.
DC input power cables are connected correctly and securely, without open
circuits or short circuits.
Yes
▢No ▢N/A ▢
6.
The communications cables are connected correctly and securely.
Yes
▢No ▢N/A ▢
7.
All the connectors in use at the bottom of the enclosure are sealed.
Yes
▢No ▢N/A ▢
8.
The AC terminal cover is reinstalled.
Yes
▢No ▢N/A ▢
9.
The maintenance compartment door is closed and the door screws are
tightened.
Yes
▢No ▢N/A ▢
10.
The idle DC input terminals are sealed.
Yes
▢No ▢N/A ▢
11.
The idle USB port is plugged with a waterproof plug.
Yes
▢No ▢N/A ▢
12.
Idle AC OUTPUT and COM connectors are plugged and the locking caps
are tightened.
Yes
▢No ▢N/A ▢
6Powering On the System
Before turning on the AC switch between the SUN2000 and the power grid, use a multimeter to
check that the AC voltage is within the specified range.

16
1. Turn on the AC switch between the SUN2000 and the power grid.
2. Ensure that the DC switches at the SUN2000 bottom are ON.
3. (Optional) Measure the temperatures at the joints between DC terminals and connectors using a
point-test thermometer.
4. Observe the indicators to check the SUN2000 operating status.
To ensure that the DC terminals are in good contact, check the temperatures at the joints between
DC terminals and connectors after the SUN2000 has been running for a period of time. Ensure
that the temperature rise does not exceed 40°C.
NOTE
Indicator
Status
Meaning
PV connection
indicator
Green on
At least one PV string is properly
connected, and the DC input voltage of
the corresponding MPPT
circuit is
higher than or equal to 200 V.
Green off
The SUN2000 disconnects from all PV
strings, or the DC input voltage of each
MPPT
circuit is less than 200 V.
Grid
-tied indicator
Green on
The SUN2000 has connected to the
power grid.
Green off
The SUN2000 has not connected to the
power grid.
Communications
indicator
Blinking green (on for 0.5s and then off
for 0.5s)
The SUN2000 receives
communications data normally.
Green off
The SUN2000 receives no
communications data for 10s.
Alarm/Maintenance
indicator
Alarm status
Blinking red at long
intervals (on for 1s and
then off for 4s).
A warning alarm is generated.
Blinking red at short
intervals (on for 0.5s and
then off for 0.5s).
A minor alarm is generated.
Steady red
A major alarm is generated.
Local
maintenance
status
Blinking green at long
intervals (on for 1s and
then off for 1s)
Local maintenance is in progress.
Blinking green at short
intervals (on for 0.125s
and then off for 0.125s)
Local maintenance fails.
Steady green
Local maintenance succeeds.
SUN2000 App
7
1. The SUN2000 app is a mobile phone app that communicates with the SUN2000 monitoring
system over a USB data cable, a Bluetooth module, or a WLAN module. As a convenient local
monitoring and maintenance platform, it supports alarm query, parameter settings, and routine
maintenance. The app name is SUN2000.
2. Access Huawei application store (https://appstore.huawei.com) or Google Play
(https://play.google.com), search for SUN2000, and download the app installation package.
3. Connect a USB data cable, a Bluetooth module, or a WLAN module to the USB port of the
SUN2000 to implement the communication between the SUN2000 and the app.
NOTE

17
•The screenshots in this document correspond to app version 3.2.00.001
(Android).
•When the WLAN connection is used, the initial name of the WLAN
hotspot is Adapter-WLAN module SN, and the initial password is
Changeme.
•The initial password for Common User, Advanced User, and Special
User is 00000a.
•Use the initial password upon first power-on and change it immediately
after login. To ensure account security, change the password periodically
and keep the new password in mind. Not changing the initial password
may cause password disclosure. A password left unchanged for a long
period of time may be stolen or cracked. If a password is lost, devices
cannot be accessed. In these cases, the user is liable for any loss
caused to the PV plant.
•Set the correct grid code based on the application area and scenario of
the solar inverter.
Login Page
WLAN or Bluetooth Connection USB Data Cable Connection
Select Connection
Mode Select User Quick Settings
Function Menu
8Common Faults and Troubleshooting
Symptom
Possible Cause
Suggestion
String Reverse
The PV string cables are
connected reversely
during the SUN2000
installation.
Wait until the solar irradiance declines at night and the
PV string current reduces to below 0.5 A. Then, turn off
the two DC switches, remove the positive and negative
connectors, and correct the polarity of the DC input
power cable.

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Shenzhen 518129 People's Republic of China
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