CPS SCH275KTL-DO/US-800 User manual

USER MANUAL
SCH275KTL-DO/US-800 Grid-Tied PV Inverter
CHINT POWER SYSTEMS AMERICA CO., LTD.
REVISION 1.0 NOVEMBER 2021

Table of Contents
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Table of Contents
0Preface.................................................................................... 4
1IMPORTANT SAFETY INSTRUCTIONS................................ 5
Warnings and Symbols in this Document..........................................5
Markings on the Product ...................................................................6
Safety Instructions of Operating the PV Inverter ...............................7
2Product Introduction........................................................... 10
Inverter for Grid-tied PV Systems....................................................10
Product Appearance and Dimensions............................................. 10
Product Features............................................................................. 11
Product Protection Functions .......................................................... 11
Smart Inverter Functions and Default Activation ............................. 12
Anti-islanding Detection ..................................................................12
Surge Suppression..........................................................................12
3Mechanical Installation ....................................................... 13
Unpacking for Inspection.................................................................13
Installation Precautions................................................................... 14
Installation Requirements................................................................15
3.3.1 Environment Requirements ....................................................15
3.3.2 Installation Modes................................................................... 15
3.3.3 Space Requirements ..............................................................15
Installation Procedures.................................................................... 16
3.4.1 Install the Inverter ...................................................................16
3.4.2 Install the WIFI Module........................................................... 19
4Electrical Connection.......................................................... 20
Schematic Diagram and Circuit Design........................................... 20
Cable Specifications........................................................................ 20
Tools Required and Torque Values..................................................21
Connect Interfaces and Connection Points .....................................21
4.4.1 Connection Interfaces.............................................................21
4.4.2 Internal Connection Points......................................................22
Electrical Cable Connection ............................................................ 23
4.5.1 Grounding............................................................................... 23
4.5.2 AC Wiring ...............................................................................24
4.5.3 DC Wiring ...............................................................................26
Communication Cable Connection..................................................29
4.6.1 Communication Board ............................................................ 29
4.6.2 Communication Cable Connection ......................................... 30
5Commissioning.................................................................... 32

Table of Contents
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Pre-commissioning Checks .............................................................32
5.1.1 Mechanical Installation ............................................................32
5.1.2 Cable Connections..................................................................32
5.1.3 Electrical Check.......................................................................32
Commissioning Steps ......................................................................32
6APP Interface and Setting ...................................................33
APP Download.................................................................................33
APP Setting .....................................................................................33
Structure Tree of App Interface........................................................36
Main Menu.......................................................................................36
6.4.1 Chart .....................................................................................37
6.4.2 Setting .....................................................................................38
6.4.3 History .....................................................................................56
6.4.4 Turn ON/OFF ..........................................................................57
7Troubleshooting ...................................................................59
LED Indicator Troubleshooting.........................................................59
Common Fault and Troubleshooting................................................60
8Maintenance..........................................................................66
Check Electrical Connections ..........................................................66
Clean the Air Vent Filter ...................................................................66
Replace the Cooling Fans ...............................................................66
Replace the Inverter ........................................................................68
9Technical Data ......................................................................69
Datasheet ........................................................................................69
Measurement Tolerance ..................................................................74
10 Quality Assurance................................................................75
Warranty ..........................................................................................75
Liability Exemption...........................................................................75
Warranty Clauses ............................................................................75
11 Contact Information .............................................................76
12 Appendix ...............................................................................77
Appendix A: Figure list .....................................................................77
Appendix B: Table list ......................................................................78

Preface
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0 Preface
Thank you for choosing a CPS Grid-tied PV Inverter (hereinafter referred to as
“PV Inverter”) developed by CHINT POWER SYSTEMS AMERICA CO., LTD
(hereinafter referred to as "CPS").
This PV Inverter is a high performance and highly reliable product specially
designed for the North American Solar market.
IMPORTANT!
Please read this manual carefully and make sure that you have
understood all the contents thoroughly before you start any
operation.
Main Contents
This Installation and Operation manual contains important information, safety
guidelines, detailed planning and setup information for installation, as well as
information about configuration, operation and troubleshooting. Be sure to read
this manual carefully before using.
Target Readers
Plant owner
Project Engineer
Installation engineer
Maintenance engineer
Installation, commissioning, troubleshooting, and maintenance of the inverter
must be done only by qualified personnel. If you encounter any problems during
the above mentioned operation, please check the user manual carefully. You can
also contact your local dealer or supplier for help if the problem still exists.
Manual Management
Please keep this user manual on hand for quick reference.
Copyrights
CPS reserves all rights in this manual. Any reproduction, disclosure or copy in
whole or in part is forbidden without prior written authorization. CPS doesn’t
accept any responsibilities whatsoever for potential errors or possible lack of
information in this document.
Version
This manual is subject to change or modification without prior notice. Users can
get the latest manual from our sales channel or our official website:
www.chintpower.com.

IMPORTANT SAFETY INSTRUCTIONS
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1 IMPORTANT SAFETY INSTRUCTIONS
（SAVE THESE INSTRUCTIONS）
Please read this user manual carefully before the installation and operation
of this PV Inverter. CPS reserves the right to refuse warranty claims for
equipment damage if users fail to install the equipment according to the
instructions in this manual.
Failure to follow these instructions and other relevant safety procedures may
result in voiding of the warranty and/or damage to the inverter or other
property!
Warnings and Symbols in this Document
Symbols
Meanings
DANGER!
DANGER indicates a hazardous situation with high level of risk
which, if not avoided, will result in death or serious injury.
DANGER!
DANGER indique une situation dangereuse avec un niveau de risque
élevé qui, si elle n'est pas évitée, entraînera la mort ou des blessures
graves.
WARNING!
WARNING indicates a hazardous situation with medium level of risk
which, if not avoided, could result in death or serious injury.
ATTENTION!
AVERTISSEMENT indique une situation dangereuse avec un niveau
de risque moyen qui, si elle n'est pas évitée, pourrait entraîner la mort
ou des blessures graves.
CAUTION!
CAUTION indicates a hazardous situation with low level of risk which,
if not avoided, could result in minor or moderate injury.
AVERTIR!
ATTENTION indique une situation dangereuse avec un faible niveau
de risque qui, si elle n'est pas évitée, pourrait entraîner des blessures
mineures ou modérées.
NOTICE!
NOTICE indicates a hazardous situation which, if not avoided, could
result in equipment working abnormally or property loss.
AVIS!

IMPORTANT SAFETY INSTRUCTIONS
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indique une situation dangereuse qui, si elle n'est pas évitée, pourrait
entraîner un fonctionnement anormal de l'équipement ou la perte de
biens.
IMPORTANT!
INSTRUCTION indicates important supplementary information or
provides skills or tips that can be used to help you solve a problem or
save you time.
IMPORTANT!
indique des informations supplémentaires importantes ou fournit des
compétences ou des conseils qui peuvent être utilisés pour vous
aider à résoudre un problème ou vous faire gagner du temps.
Table 1-1 Warnings and Symbols in this Document
Markings on the Product
Symbols
Meanings
WARNING:
Risk of Electric Shock.
ATTENTION:
Risque de choc electrique.
CAUTION:
Risk of electric shock from energy stored in capacitor.
Do not remove cover until 5 minutes after disconnecting all
sources of supply.
ATTENTION:
Risque de choc électrique à partir d´énergie stockée dans les
condensateurs.
Retirer le couvercle du boîtier au moins 5 minutes après avoir
débranché toutes les sources d´approvisionnement.
CAUTION:
Hot surfaces.
To reduce the risk of burns. Do not touch.
ATTENTION:
Surface chaude.
Pour réduire le risqué de brûlures ne pas toucher.
For more details please see the user manual.
Pour plus de détails, veuillez consulter le manuel d'utilisation.

IMPORTANT SAFETY INSTRUCTIONS
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WARNING:
For continued protection against risk of fire, replace only with
same type and ratings of fuse.
Refer to instruction manual for details.
ATTENTION:
Pour continuer d'assurer la protection contre les risques
d'incendie, il faut remplacer les fusibles de même type et
courant.
Reportez-vous au manuel d'instructions pour plus de détails.
EARTH GROUND!
This symbol marks the location of a grounding terminal,
which must be securely connected to the earth through the
PE (protective earthing) cable to ensure operational safety.
TERRE TERRE !
Ce symbole marque l'emplacement d'une borne de mise à la
terre, qui doit être solidement connectée à la terre via le câble
PE (mise à la terre de protection) pour assurer la sécurité de
fonctionnement.
RoHS SYMBOL
In accordance with 2011/65/EU regulations, the inverter
imposes restrictions on the use of specific hazardous
substances in electrical and electronic equipment.
SYMBOLE RoHS
Conformément à la réglementation 2011/65/UE, l'onduleur
impose des restrictions sur l'utilisation de substances
dangereuses spécifiques dans les équipements électriques
et électroniques.
TUV Certification
This inverter has passed TUV Certification.
Certification TUV
Cet onduleur a passé la certification TUV.
Phase information of the inverter.
Information de phase de l'onduleur.
Table 1-2 Markings on the Product
Safety Instructions of Operating the PV Inverter
DANGER!
Disconnect the inverter from PV modules and the AC grid before
maintaining and operating the equipment. Make sure hazardous high
voltage and energy inside the equipment has been discharged.

IMPORTANT SAFETY INSTRUCTIONS
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Do not operate or maintain the inverter until at least 5 minutes after
disconnecting all sources from DC and AC sides.
The DC conductors of this PV system are normally ungrounded but
will become intermittently grounded without indication when the
inverter measures the PV array isolation.
If there is a fault and it is unsafe to access the inverter:
1. Notify someone else. Initiate emergency mitigation plan if necessary.
If smoke or fire exists, procure a fire extinguisher.
2. If a fire has escaped the inverter enclosure – notify 911 immediately!
3. Turn OFF the AC feed breaker as soon as possible/safe.
4. If safe but conditions are deteriorating, consider:
a) Using the fire extinguisher.
b) Cutting the string conductors – one cable at a time with
insulated cutters (while wearing appropriate PPE).
5. Monitor conditions until low irradiation ~30min prior to sunset. If safe,
turn OFF DC switches on the inverter and AC switches/disconnect
external to the inverter and proceed with normal troubleshooting
procedures, refer to Troubleshooting chapter.
WARNING!
All the installation and wiring connections should be performed only
by qualified technical personnel. Disconnect the inverter from PV
modules and the AC grid before maintaining and operating the
equipment.
Risk of electric shock and fire. Use only with PV modules that in
conformance with the maximum system voltage.
Electric shock Hazard. The DC conductors of this photovoltaic
system are normally ungrounded but will become intermittently
grounded without indication when the inverter measures the PV array
isolation.
Shock Hazard. The inverter is energized from both AC and DC
sources. Disconnect all sources before servicing.
The DC Switch is rated to break loads under normal operating
conditions. However, a DC short circuit could be hazardous and the
following procedures should be followed before turning OFF the DC
Switch under fault conditions.
CAUTION!
Please ensure the mounting bracket is properly installed before
hanging the inverter and wire-box on the bracket.
This AFCI device automatically resets and may only be used when
allowed by NFPA 70 and CSA C22.1.

IMPORTANT SAFETY INSTRUCTIONS
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NOTICE!
This inverter is designed to connect AC power only to the public grid.
Do not connect the AC output of this equipment directly to any private
AC power equipment.
IMPORTANT!
Please check with your local electricity supply company before
selecting a Grid Code. If the inverter is operated with a wrong Grid
Code, the electricity supply company may cancel the interconnection
agreement.
Placing the inverter into operation before the overall system complies
with the national rules and safety regulations of the application is not
permitted.
If there is a fault and it is safe to access the inverter:
1. Read/record the fault code(s) displayed on the APP interface.
2. Turn OFF the inverter via the APP or Remote access.
3. Turn OFF the AC feed breaker or AC fuse switch disconnect.
4. If possible, read the DC MPPT currents displayed on the APP
interface:
a) If the MPPT current is lower than 20A or the irradiation is
obviously low, turn OFF the DC switch.
b) If it is safe to open the front cover, proceed with
troubleshooting procedures. Make sure appropriate safety
precautions and PPE are used.
5. If it is not possible to read the DC MPPT currents through the APP
interface, and no fire, smoke or voltage (AC or DC) to ground is
present in the enclosure:
a) Follow general safety practices including PPE to open the
wire-compartment.
b) Measure the DC current on each string. If zero, open the
fuse holder (when installed) for each string reading
approximately zero amps.
c) If the DC current is higher than 0.25A, do not open the fuse
holder (when installed).
d) When all possible fuses (when installed) are open,
measure each MPPT current. If it is lower than 20A, turn
OFF the DC switch.
e) If turning OFF the DC switch causes smoke, then (if safe)
turn the DC switch back ON and wait until low irradiation
~30min prior to sunset to continue troubleshooting.
Table 1-3 Safety Instructions of Operating the PV Inverter

General Introduction
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2 Product Introduction
Inverter for Grid-tied PV Systems
CPS 3-Phase String Inverters SCH275KTL-DO/US-800 series are designed for
Commercial and Utility scale PV grid-tied systems. The system is generally made
up of PV modules, DC power distribution equipment, PV inverter and AC power
distribution equipment, as shown in Figure 2-1. The solar energy is converted by
PV modules to DC power, and then inverted by the inverter to AC power with the
same frequency and phase as the AC grid. Now the AC power can be supplied in
all or in part to local loads, with the remaining power fed to the grid.
Bidirectional
electric meter
AC power
distribution
equipment
Figure 2-1 Grid-tied PV system
Product Appearance and Dimensions
Figure 2-2 Product appearance
Figure 2-3 Product dimensions

General Introduction
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Product Features
High conversion efficiency
- Advanced 3-level conversion technology with SVPWM
- Max. efficiency: 99%
- CEC efficiency: 98.5%
Grid adaptability
- IEEE 1547 2003, IEEE 1547 2014, IEEE 1547 2018, Rule 21, and
ISO-NE standards applicable
- Reactive power adjustable
- PF value: ±0.8, Remote Curtailment
Flexible communication
- Supports standard Modbus RS485 and
TCP/IP/PLC/CAN/ETHERNET communications to ensure
compatibility with 3rd party monitoring and control systems.
Wide DC input voltage range
- Operating DC Input Voltage Range: 500-1450Vdc
- Max DC input voltage: 1500V
Long Service Life
- Uses both thin-film capacitors and electrolytic capacitors to extend
inverter's service life
High protection degree:
- NEMA Type 4X enclosure meets the demanding needs of both indoor
and outdoor use
- DC switch can be locked in the OFF position to avoid accidental
turning on
Intelligent Integration:
- Integrated load break rated DC disconnect switches,
- Up to 36 fused string inputs eliminate the need for external combiner
boxes, simplifying installation
Product Protection Functions
AC and DC short circuit protection
AC output voltage and frequency monitoring
Leakage current against ground monitoring
DC Input over-current protection
DC input insulation against ground monitoring
DC injection of AC output
Anti-islanding protection with bi-directional frequency perturbation
DC Input and AC output over-voltage protection
External environmental temperature monitoring
IGBT power module temperature monitoring

General Introduction
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Smart Inverter Functions and Default Activation
Function
IEEE1547-2018
Rule 21
ISO-NE
Anti-islanding
Enabled
Enabled
Enabled
Low/High Voltage Ride-through
Enabled
Enabled
Enabled
Low/High Frequency Ride-
through
Enabled
Enabled
Enabled
Dynamic Volt/VAR Operation
Enabled
Enabled
Enabled
Ramp Rate
Enabled
Enabled
Enabled
Fixed Power Factor
Disabled
Disabled
Disabled
Reconnect by “Soft-Start”
Enabled
Enabled
Enabled
Frequency-Watt
Enabled
Enabled
Enabled
Volt/Watt
Enabled
Enabled
Enabled
Table 2-1 Smart inverter functions and default activation
Anti-islanding Detection
The inverter includes Anti-Islanding detection as required by UL1741/IEEE1547. It
will continuously make bi-directional perturbations to the frequency of the output
current by injecting a small amount of reactive power in order to detect a possible
islanding condition. If the grid is stable, these small perturbations will have
negligible effects on the system voltage frequency. However, in an islanded
condition the changes in reactive power will force the frequency of the system
voltage to deviate significantly, which will trigger the inverter to cease operation
and disconnect from the grid.
Surge Suppression
Standard Waveform Peak Values
Surge Category
Ring Wave*
Combination Wave**
B
6kV/0.5kA
6kV/3kA
Table 2-2 Standard Waveform Peak Values
Notes:
* stands for 0.5μs - 100 kHz Ring Wave
** stands for 1.2/50μs - 8/20μs Combination Wave

Mechanical Installation
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3 Mechanical Installation
Unpacking for Inspection
All the delivery items are shipped in one package, which includes the inverter,
mounting bracket, four PE accessory bags and one zip file bag.
Before performing installation, check the product for any obvious damages or if
the items on the delivery list are complete. Contact your supplier if any problem
is found. The delivery list is as below:
Figure 3-1 Delivery list
No.
Item names
QTY
Usages
1
Inverter
1
For PV inverter
2
Mounting bracket
1
Install inverter
3
PE accessory bag
1
Include accessories A-D
4
PE accessory bag
1
Include accessories E-K
5
PE accessory bag
1
Include accessories I-N
6
PE accessory bag
1
Include accessories O
7
PE zip file bag
1
Include quick guide, warranty card,
certification
A
M10x50 Hex. combination
screw
6
For mounting bracket.
B
M6x90 Hex.comb. screw
2
Fasten the inverter.
C
M6x16 Comb. screw
2
For grounding.
D
M10 Lifting eyebolt
2
Lift inverter by slope
E
M10 nut
6
For mounting bracket.
F
M10 flat gasket
6
For mounting bracket.

Mechanical Installation
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G
M10 spring washer
6
For mounting bracket.
H
M12 nut
6
For AC terminal block
I
M12 flat gasket
6
For AC terminal block
J
M12 spring washer
6
For AC terminal block
K
M12 big flat gasket
6
For AC terminal
L
M6x18 screw with plastic
flat washer
1
Spare for front cover
M
Handle
2
Carry the inverter.
N
6-pin connector plug
1
For RS485 comm.
O
LINKIT
1
For communication.
Table 3-1 Accessory list
IMPORTANT!
The items on the delivery list above are for the standard configuration.
The accessories provided may vary if optional parts are purchased.
Installation Precautions
Check that the product environmental specifications (protection degree,
operating temperature range, humidity and altitude, etc.) meet the
requirements of the specific project location.
Make sure that the power grid voltage is within the normal range of the
Grid Code chosen.
Ensure that you have been authorized by the local electricity supply
authority to connect to the grid.
Installation personnel must be qualified electricians or those who have
received professional training.
Wear and use proper PPE (personal protective equipment) during
installation.
Sufficient space must be provided to allow the inverter cooling system
to operate normally.
Install the inverter away from flammable and explosive substances.
Make sure the installation condition doesn’t exceed the temperature
limits specified for the inverter, to prevent undesirable power loss.
Do not install the inverter near an electromagnetic source which can
compromise the normal operation of electronic equipment
The PV Array is not grounded.
The conduits entries meet the following:
- ALL Conduit Entries must use water-tight fittings.
- ALL Conduit Entries should use sealant around wires inside wire-
compartment to prevent moisture ingress.
- ALL Conduit Fittings should be metal to contain any thermal event in
the wire-compartment – cause by moisture ingress.
For detailed specification ranges and limits, see Chapter 9, Technical Data.

Mechanical Installation
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Installation Requirements
3.3.1 Environment Requirements
The installation of the inverter shall meet the following environment requirements.
Figure 3-2 Environment requirements
NOTICE!
If the installation environment allows, avoiding direct sunlight from the
inverter, avoiding direct rain and snow, can extend the life of the
inverter. Direct sun install does not impact warranty.
3.3.2 Installation Modes
The inverter shall be installed following the modes as below:
a) If the location permits, install the inverter vertically.
b) If the inverter cannot be mounted vertically, it may be tilted backward
by lower than 15 degrees from vertical direction.
c) Do not mount the inverter leaning forward.
d) Do not mount the inverter upside down.
e) Do not mount the inverter horizontally.
Figure 3-3 Installation modes
NOTICE!
Make sure that the mounting structure (bearing wall, rack, etc.) is
capable to bear the weight of the inverter.
3.3.3 Space Requirements
The distances between the inverters or the surrounding objects should meet the
following conditions:

Mechanical Installation
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Figure 3-4 Space Requirements
A: Keep a proper distance between the inverter and the shelter to ensure good
ventilation.
B: The inverter can be installed at an angle of 75° ~90° while its back shall not be
shielded to ensure good ventilation.
C: Two inverters can be installed back to back, and proper distance shall be kept
to ensure good ventilation.
D: The inverter can be installed under the panel, while its back and top shall not
be blocked to ensure good ventilation.
E: The inverter can be installed on a single column holding rod and shall be
checked to confirm a secure installation.
Installation Procedures
3.4.1 Install the Inverter
1. Mark hole positions on the installation structure (shelter, steel rack,
etc.) according to the size of the mounting brackets.

Mechanical Installation
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Figure 3-5 Hole positions of mounting bracket
2. Drill holes with a Ф12mm drill at the marked position, and then fasten
the mounting bracket ① on the installation structure with six M10x50
hexagon combination screws ② included in the PE accessory bag.
Tools required: 16mm hex socket wrench, torque: 12.5N.m,110 lbf-in.
Figure 3-6 Fasten the mounting bracket
3. Position the inverter onto the mounting brackets by either of the two
ways.
A. Lift mounting: screw two M10 lifting eyebolts to the studs at the
top of the inverter. Use sling rope or bar (inserted through both
lifting eyebolts) to lift the inverter onto the mounting bracket. The
minimum angle between the two sling ropes should be less than
90 degrees, as shown in Figure 3-7.

Mechanical Installation
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Figure 3-7 Lifting sling
B. Manual mounting: Three people are needed to properly lift the
inverter by the handle positions marked in Figure 3-8, and mount
the inverter onto the mounting bracket.
Figure 3-8 Handle positions
CAUTION!
The total weight of the inverter is approx. 119 kg (262.4 pounds).
Ensure the mounting bracket is properly installed before hanging
the inverter on the bracket. It is recommended to have at least 3
people to mount the inverter due to the weight of the equipment.
4. Use two M6X90 screws to fasten inverter on mounting bracket.
Tools required: #3 Philips head screwdriver, torque: 6 N.m, 53.1 lbf-in.

Mechanical Installation
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Figure 3-9 Fasten the inverter
3.4.2 Install the WIFI Module
1. Remove the two M4x10 fixing screws on the DB9 connector cover, as
shown in Figure 3-10.
Figure 3-10 Expose the connector
2. Rotate the cover to expose the connector and then install the WIFI
module with the two screws just removed. Pay attention to the control
torque of 1.6 Nm, to ensure that the seal watertight.
Figure 3-11 Install WIFI module

Electrical Connection
20 / 79
4 Electrical Connection
Schematic Diagram and Circuit Design
The electrical schematic diagrams of inverter are as shown in Fig. 4-1a and 4-1b.
L1
L2
L3
PE
PV1+
PV2+
PV1-
PV2-
DC Switch MPPT1
AC Output
PV Input
PV3+
PV4+
PV3-
PV4-
PV23+
PV24+
PV23-
PV24-
DC SPD
BUS
AC
EMI
AC Relay
MPPT2
MPPT12
PV Sense
...
...
...
LC Filter
AC SPD
DC/AC
RCD
IMD
DC
EMI
Figure 4-1a Schematic Diagram of the 24 Input Inverter
L1
L2
L3
PE
PV1+
PV2+
PV3+
PV1-
PV2-
PV3-
DC Switch MPPT1
AC
Output
DC SPD
BUS
AC
EMI
AC Relay
MPPT2
MPPT12
...
...
...
LC Filter
AC SPD
DC
EMI
DC/AC
PV Input
PV4+
PV5+
PV6+
PV4-
PV5-
PV6-
PV34+
PV35+
PV36+
PV34-
PV35-
PV36-
Figure 4-1b Schematic Diagram of the 36 Input Inverter
Cable Specifications
Cable
Type
Outer dia.
cross-sectional area
DC
Use 90 ℃
copper/*aluminum wire
10~4AWG
GND
Outdoor copper core
wire
/
Phase wire diameter/2
AC
Outdoor three-core
copper/ aluminum wire
≤∅92mm
Aluminum alloy cable.
L1,L2,L3: 250kcmil~750kcmil
PE: Phase wire diameter/2
Comm.
Communication cable UTP CAT-5e or Belden 3106A or equivalent
*For Aluminum DC cable Bimetal ferrule shell be used.
Table 4-1 Cable Specifications