Sungrow PVS-24MH User manual

PVS-24MH_20MH_16MH-UEN-Ver11-201911
User Manual
PVS-24MH/20MH/16MH
PV Array Combiner Box

Contents
1About This Manual..............................................................1
1.1 Validity.......................................................................................1
1.2 Contents....................................................................................1
1.3 Target Readers..........................................................................1
1.4 How to Use this Manual ............................................................2
1.5 Others .......................................................................................2
1.6 Symbol Explanation...................................................................2
1.7 Figures Explanation...................................................................3
2Safety Instructions..............................................................4
3Product Description............................................................7
3.1 System Introduction...................................................................7
3.2 Main Features ...........................................................................8
3.3 Demonstration of the Type ........................................................8
3.4 Dimensions ...............................................................................8
3.5 Identifying the PVS....................................................................9
4Mechanical Installation.....................................................10
4.1 Scope of Delivery....................................................................10
4.2 Installation Site Requirements.................................................10
4.3 Installation Tools...................................................................... 11
4.4 Installing PVS..........................................................................12
5Electrical Installation ........................................................15
5.1 Internal Structure.....................................................................15
5.2 Waterproof Terminals ..............................................................17
5.3 Wiring Preparations.................................................................18
5.4 Connections ............................................................................19
5.4.1 Input Connections ...................................................................19
5.4.2 Output Connections................................................................. 22
5.4.3 Grounding Connections...........................................................24
5.4.4 Communication Connections................................................... 26
5.4.5 Bottom Wiring.......................................................................... 28

5.5 Cable Layout............................................................................29
5.6 Communication Settings..........................................................30
5.6.2 Setting Communication Address............................................. 31
5.6.3 Setting String Input Number .................................................... 31
5.7 Start/Stop.................................................................................32
6Commissioning .................................................................33
7Routine Maintenance........................................................34
7.1 Overview..................................................................................34
7.2 Replace the Fuse.....................................................................34
7.3 Replace the Sealing Strip ........................................................35
8Troubleshooting................................................................36
8.1 Before Troubleshooting............................................................36
8.2 Common Faults and Troubleshooting......................................36
9Appendix............................................................................39
9.1 Technical Data .........................................................................39
9.2 Cable Requirement..................................................................40
9.3 Quality Assurance....................................................................40
9.4 Contact Information..................................................................41

1
1 About This Manual
1.1 Validity
This manual is valid for the following PV array combiner boxes:
PVS-24MH
PVS-20MH
PVS-16MH
1.2 Contents
Safety instructions
Safety instructions for the installation, operation, commissioning and
maintenance of PVS.
Product description
Location of PVS in the PV system, structure, function and classification.
Installation guide
The installation methods and electrical connections of PVS.
Routine maintenance
How to replace the fuses of PVS.
Others
Technical data of PVS, exclusion of liability and the way to contact us.
1.3 Target Readers
This manual is for users who operate the PVS or conduct the maintenance work.
The operators must be trained and qualified personnel.

1 About This Manual User Manual
2
1.4 How to Use this Manual
Read this manual and other related document before installing the PVS.
Documents must be stored in a convenient place for future reference.
The contents of the manual will be periodically updated or revised due to the
product development. It is probably that there are changes of manual in the
subsequent edition.
1.5 Others
This document will take the PVS-24MH for example. For the installation and
use of other types of combiner boxes, please also refer to this manual.
PVS-20MH
PVS-16MH
The electrical structure, installation and use method of PVS-20MH / PVS-16MH
are the same with that of PVS-24MH. The only difference between them is the
numbers of DC input strings.
1.6 Symbol Explanation
This manual contains important safety and operational instructions that must be
accurately understood and followed during the installation and maintenance of
the equipment.
To ensure optimum use of this manual, note the following explanations of
symbols used.
DANGER indicates a hazard with a high level of risk which, if not
avoided, will result in death or serious injury.
WARNING indicates a hazard with a medium level of risk which, if not
avoided, will result in death or serious injury.

User Manual 1 About This Manual
3
CAUTION indicates a hazard with a low level of risk which, if not
avoided, will result in minor or moderate injury.
NOTICE indicates a situation which, if not avoided, will result in
equipment malfunction or property damage.
NOTE indicates additional information, emphasized contents or tips
to help you solve problems or save time.
The following symbols on the device enclosure must be paid attention to.
Symbols
Explanation
Risk of electric shock! If not avoided, lethal hazard can be caused.
Hot surface! Do not touch!
The symbol represents protective conductor terminal. The terminal
should be connected firmly to avoid potential injury or property
damage.
1.7 Figures Explanation
Figures provided in this manual are all based on the PVS with standard
configuration.
The actual PVS you received may differ from the example figures in the
numbers of the installation hangers, etc.

4
2 Safety Instructions
This chapter describes some important safety instructions about PVS.
Please read the manual carefully before installation. If any device damage
occurs when ignoring the safety instructions, our company has the right to
exclude all warranty claims.
Lethal Voltage!
Death resulting from burning and electric shock upon touching the
live components of the PVS.
Disconnect the end connection of the PV string before cable
connection;
Do not use ordinary ammeter to measure the DC voltage before cable
connection. An ammeter with withstanding voltage of 1500V is
recommended. Serious consequences may follow if otherwise.
Observe all safety instructions required by the PV cell manufacturer.
Device damage or system fault may cause fire and electric shock!
Optical check the device for any possible damages or dangerous
states before operation.
Check if other external devices or circuit connection are in safe state.
Work on the device only when it is safe to do so.
Death or burning hazard by touching the internal terminals of the
device!
Do not touch the terminals or conductors in contact to the inverter or
PV string.
Observe all the instructions and safety regulations related to PVS
connection.

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High voltage is present inside the device!
Follow all the warning signs in the device.
Respect all the safety instructions in this manual and other
document.
The ground cable must be grounded properly, otherwise,
lethal electric shock happens to the operator or installer once a fault
occurs.
device may be damaged after lightening stroke.
Incorrect cable connection may cause damages to the PV cells, the
PVS and inverter. Respect the following instructions during cable
connection:
Connect by strictly following the circuit diagram;
Measure and make sure the string open-circuit voltage meets the
requirements of the PVS before inserting the fuse;
Identify the positive pole and negative pole before connection.
Only qualified personnel or professional electrician can perform the
operation and wiring described in this manual.
All operations and wirings must in full accordance with the national
and local standards and requirements.
All warning marks and labels must be clear and intact. Replace them
if any damages are found.

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6
Make sure the terminals are firmly connected during wiring. If the cable
copper core and the terminals are not connected firmly, terminals will
be over-heating and burnt. Anti-flaming cables with multi-strand are
advisable and the cable cross-sectional area should be no less than
the recommended value.
The nuts of the water-proof terminals must be firmly screwed to
prevent water leakage and PVS damages.
Pull the fuse out of the fuse holder for personal and device safety.
Lock the cabinet door and seal the water-proof cover of the lock core
after operation.
No not open the cabinet door frequently.
Touching or improper operation on the PCB or other sensitive
components may damage the device.
Do not touch any parts inside the cabinet other than the connection
terminals.
Respect all ESD related safety regulations and wear antistatic wrist
strap.

7
3 Product Description
3.1 System Introduction
For a large-scale grid-connected PV system, it is common to install a DC
combining device between PV modules and inverters to minimize cable
connections, facilitate maintenance and enhance reliability.
PVS is designed for meeting these requirements, which provides a Turnkey
solution for PV plant systems.
Considering different types of PVS, a certain number of PV strings can be
connected to the input side of PVS. After combining work done, at the output
side, there will be one DC+ and one DC- main line. By using of surge protection
device (SPD) and load-break switch, the output can be connected to inverters
directly.
The PV generation system including a PVS is shown in following figure.
Fig. 3-1 Composition of PV generation system
Tab. 3-1 Device in above figure
No.
Device
A
PV arrays
B
PV Array combiner box
C
Inverter
D
Logger/Smart monitoring unit
E
Meteo Station
F
Grid

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3.2 Main Features
Meet outdoor installation requirement
Connect to multiple PV inputs with fuse for each input (can be replaced to
other degree)
PV-specific high voltage SPD equipped, lightening protection function for
positive and negative pole
Current detection unit monitors the current of each string; and the monitored
information can be displayed by the LED or sent by RS485
Monitor busbar voltage and the monitored information can be displayed by
the LED and sent by RS485
3.3 Demonstration of the Type
Description of the combiner box type is as follows:
PVS XX
B
A
M
C
-H
D
Meanings of the letters are as follows:
A: Code of the PV array combiner box
B: Max. number of PV strings
C: Equipped with monitoring function
D: High voltage, up to 1,500Vdc
Model
Max.Number of PV strings
Monitoring function
PVS-24MH
24
YES
PVS-20MH
20
YES
PVS-16MH
16
YES
3.4 Dimensions
The dimensions of the PVS are shown in the figure below (take PVS-24MH for
example).

User Manual 3 Product Description
9
930
730
264
3.5 Identifying the PVS
The appearance of the PVS is shown in the figure below (take PVS-24MH for
example).
A
No.
Name
Description
A
Lockhole
-

10
4 Mechanical Installation
4.1 Scope of Delivery
A B C
ED F
No
Name
Note
Quantity
A
PVS
-
1
B
Related documents
Including FQC test report,
Quality Certificate, Warranty
card, Manual, etc.
1
C
Keys
To open the cabinet of PVS.
1
D
Bolt kit
M8 x 16
4
E
Hanger
Need to be installed to the PVS
cabinet onsite.
4
F*
MC4 connector
Used to connect the PV input
16 pairs a) /
20 pairs b) /
24 pairs c)
Note 1: * is optional accessory.
Note 2: a) is intended for PVS-16MH; b) is intended for PVS-20MH; and c) is
intended for PVS-24MH.
4.2 Installation Site Requirements
With IP67 protection degree, the PVS can be installed outdoors. Please meet

User Manual 4 Mechanical Installation
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the following requirements:
Take the dimensions and weight of the PVS into account when selecting the
installation location. The PVS should be installed as close to the PV modules
as possible for easier current confluence and lower cable costs.
The ambient temperature ranges from -30℃to +60℃, and the relative
humidity from 0 to 95%. The PVS should be installed in a dry, well-ventilated,
and dust-proof place.
Never install the PVS in a place directly exposed to sunlight. Otherwise,
excessively high temperature will cause lower power yields or even shorten
the service life of the device.
In a large-scale power plant, the PVS should be vertically installed at the
shading area of the bracket of PV modules. Maintain enough clearances
around the PVS for better heat dissipation and ease of routine maintenance.
Humidity during installation may damage the PVS. Do not install the
PVS during rainy or humidity days.
Screw the water-proof terminals tightly to prevent moisture penetration
no matter vertical installation or horizontal installation. Seal the unused
terminals after cable connection.
4.3 Installation Tools
General tools
Marker
Measuring tape
Level
Utility knife
Multimeter
Range: ≥
1,500Vdc
880.0
Wrist strap
Protective gloves
-

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Dust mask
Earplugs
Goggles
Insulated shoes
Vacuum cleaner
Heat shrink tubing
Heat gun
-
Installation tools
φ11 Hammer drill
M10 Electric
screwdriver
M10 Screwdriver
Wire stripper
Hydraulic pliers
Crimping tool
MC4 terminal
wrench
Wire cutter
4.4 Installing PVS
Overview
The PVS is fixed to the installation surface via the hangers in the scope of
delivery. Therefore, fix the hangers to the PVS on site.
Installing Hangers
Anchor the hangers to the back of the PVS by using supplied M8 x 16 bolt
assembly, as shown in the figure below.

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816
4-Φ12 x 25
701
Fixing PVS to Installation Surface
On site, the PVS can be installed on the bracket or the back of the PV module.
Step 1Mark positions on the back of the PV module according to the distance
between the hangers, and drill holes according to the marks.
Step 2Anchor the PVS to the bracket in the sequence shown in the figure below,
where the recommended torque is: 51±0.7 N.m.
A BCD FE
Item
Name
Description
A
M10 bolt
Beyond the scope of delivery
B
Flat washer
-
C
Spring washer
-
D
PVS hangers
-

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Item
Name
Description
E
PV module bracket
-
F
Nut
-

15
5 Electrical Installation
5.1 Internal Structure
Two schemes are available for the combiner box: floating grounding and
negative grounding. Correspondingly, the internal structural diagram differs.
AD
C
E
F
G
B
Fig. 5-1 Floating grounding
A
C
B
GF
E
Fig. 5-2 Negative grounding
No.
Description
A
DC+ fuse cartridge
B
Ground copper bar
C
RS485 ports
D
DC- fuse cartridge

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No.
Description
E
The monitoring board
F
SPD (Surge protection device)
G
Load-break switch
* The figure and the configurations are for reference only, and the actual
product shall prevail.
The Monitoring Board
The monitoring board monitors the current of each string. The monitored
current value is sent to the PC through RS485. The PC can judge if a fault is
occurred to the module through the set value.
H
J
I
No.
Description
H
From left to right, the indicators are respectively:
TX: Transmitted communication data signal indicator
RX: Received communication data signal indicator
RUN: Monitoring unit running status indicator
SPD: Surge protection device fault indicator
CB: Load-break switch status indicator
POWER: Monitoring unit power supply status indicator
I
Key buttons K1 and K2 (used for switching current, communication and
other parameters)
J
LED display (display current, baud rate, communication address,
chassis temperature, etc.)
SPD (Surge Protection Device)
An SPD is equipped inside the PVS to prevent the transient overvoltage caused
by lightning. The SPD failure signal can be sent to the PC through the RS485.
Grounding
It must be grounded properly for overvoltage protection. The PVS provides a
ground terminal for grounding connection.