CPS SCH275KTL-DO/US-800 User manual

USER MANUAL
SCH275KTL-DO/US-800 Grid-Tied PV Inverter
(1.0101.0815/1.0101.0759/1.0101.0792 Models)
CHINT POWER SYSTEMS AMERICA CO., LTD.
Rev 1.2 June 2023

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.................................................8
2Product Introduction ..................................................................11
Inverter for Grid-tied PV Systems ..................................................................... 11
Product Appearance and Dimensions............................................................... 11
Product Features ..............................................................................................12
Schematic Diagram and Circuit Design ............................................................14
Product Protection Functions............................................................................15
Smart Inverter Functions and Default Activation ...............................................15
Anti-islanding Detection ....................................................................................15
DC Ground Fault Protection..............................................................................16
Surge Suppression ...........................................................................................16
3Mechanical Installation.............................................................. 17
Unpacking for Inspection ..................................................................................17
Pre-Installation Checklist ..................................................................................18
Installation Requirements .................................................................................21
3.1.1 Installation Methods.........................................................................21
3.1.2 Installation Environment...................................................................21
3.1.3 Space Requirements .......................................................................22
Installation Procedures .....................................................................................23
3.1.4 Install the Inverter ............................................................................23
4Electrical Connection ................................................................ 26
Cable Specifications .........................................................................................26
Tools Required and Torque Values ...................................................................26
Connect Interfaces and Connection Points.......................................................27
4.1.1 Connection Interfaces......................................................................27
4.1.2 Internal Connection Points...............................................................28
Electrical Cable Connection..............................................................................29
4.1.3 Grounding........................................................................................30
4.1.4 AC Wiring.........................................................................................32
4.1.5 DC Wiring ........................................................................................34
Communication Cable Connection....................................................................38
4.1.6 Communication Board .....................................................................38
4.1.7 Communication Connection.............................................................39
Install the LINKIT Module..................................................................................42
Cable Connection Notices for Joints and Seals ................................................43

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5Commissioning .......................................................................... 45
Pre-commissioning Checks...............................................................................45
5.1.1 Mechanical Installation.....................................................................45
5.1.2 Cable Connections ..........................................................................45
5.1.3 Electrical Check ...............................................................................45
Commissioning Steps .......................................................................................46
6APP Interface and Setting ......................................................... 47
APP Download..................................................................................................47
APP Setting.......................................................................................................47
Structure Tree of App Interface .........................................................................51
Main Menu ........................................................................................................51
6.1.1 Chart ..............................................................................................53
6.1.2 Setting..............................................................................................53
6.1.3 Event ..............................................................................................76
6.1.4 More ..............................................................................................78
7Troubleshooting......................................................................... 79
LED Indicator Troubleshooting..........................................................................79
Common Fault and Troubleshooting .................................................................80
8Maintenance ............................................................................... 87
Check Electrical Connections ...........................................................................87
Clean the Air Vent Filter ....................................................................................87
Replace the Cooling Fans.................................................................................87
Replace the Inverter..........................................................................................89
9Technical Data............................................................................ 90
Datasheet .........................................................................................................90
Measurement Tolerance....................................................................................95
10 Limited Warranty........................................................................ 96
11 Recycling.................................................................................... 97

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 installation
or operation of this unit, please check the user manual carefully before contacting
CPS Customer Service.
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
responsibility whatsoever for potential errors or possible lack of information in this
document.
Version
This manual is subject to change or modification without prior notice. The latest
version of this manual can be acquired via the website at:
www.chintpowersystems.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

IMPORTANT SAFETY INSTRUCTIONS
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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.
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.
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 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.
CAUTION!
The total weight of the inverter is approx.119kg (262.4pounds). Please
ensure the mounting bracket is properly installed before hanging the
inverter and wire-box on the bracket. It is recommended to have at least
3 people mount the inverter due to the weight of the equipment.
This AFCI device automatically resets and may only be used when
allowed by NFPA 70 and CSA C22.1.
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. The inverters are to be installed with floating or
ungrounded PV arrays only.

IMPORTANT SAFETY INSTRUCTIONS
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IMPORTANT!
Please check with your local electricity supply company before
selecting a Grid Code. If the inverter is operated with an incorrect grid
standard, the electric utility 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.
WARNING!
WARNING: 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.
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

IMPORTANT SAFETY INSTRUCTIONS
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holder (when applicable) for each string reading approximately
zero amps.
c. If the DC current is higher than 0.25A, do not open the fuse holder
(when applicable).
d. When all possible fuses 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.
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
chapter 7 Troubleshooting.

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 use
with an UNGROUNDED PV array in Commercial and Utility scale PV grid-tied
systems. The system is generally made up of PV modules, PV inverter and AC power
distribution equipment, as shown in Figure 2-1. The inverter converts the available
DC energy from the PV modules to AC power by synchronizing the output current to
the same frequency and phase as the AC grid. All or part of the AC power is supplied
to local loads, and the surplus power is exported to the electric utility grid.
Bidirectional
electric meter
AC power
distribution
equipment
Figure 2-1 Grid-tied PV system
Product Appearance and Dimensions
Figure 2-2 Product appearance

General Introduction
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Figure 2-3 Product dimensions
IMPORTANT!
SCH275KTL-DO/US-800 inverter has 36 input (fused) and 24 input
(unfused) versions. Both of these versions have similar appearance, similar
dimensions and their mounting procedures are also the same. However,
their DC connection methods and communication methods are different,
hence will be introduced separately in the following contexts.
Product Features
High conversion efficiency: Advanced 3-level conversion technology with
Space-Vector PWM; Max. efficiency: 99%; CEC efficiency: 98.5%.
Grid adaptability: Selectable grid standards: IEEE 1547-2018, CA Rule 21,
ISO-NE, and HECO; Reactive power; PF value: ±0.8, and optional local or
remote Active Power Curtailment.
Flexible communication: Supports standard CPS Modbus RS485, SunSpec
Modbus, Ethernet TCP/IP, and AC-PLC communications to ensure compatibility
with 3rd party monitoring and control systems. The FlexOM gateway card
enables further command/control as well as remote firmware upgrades.
(FlexOM gateway card is an optional accessory. Refer to FlexOM gateway card
manual for further detailed information.)
Wide DC input voltage range: Operating DC Input Voltage Range: 500-
1450Vdc; Max DC input voltage: 1500Vdc.
Long Service Life: Uses thin-film and electrolytic capacitors to extend inverter's
service life.

General Introduction
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High protection degree: NEMA Type 4X enclosure meets the demanding
needs of both indoor and outdoor use.
Intelligent Integration: Integrated load break rated DC disconnect switches;
DC switches can be locked out in the OFF position to prevent operation. Up to
36 fused string inputs or 24 unfused inputs eliminate the need for external
combiner boxes, simplifying installation.

General Introduction
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Schematic Diagram and Circuit Design
The electrical schematic diagrams of inverter are as shown in Fig. 2-4.
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 2-4a Schematic Diagram of the 24 Input Inverter Model
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 2-4b Schematic Diagram of the 36 Input Inverter Model

General Introduction
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Product Protection Functions
AC and DC short circuit protection
AC output voltage and frequency monitoring
Leakage current to ground monitoring
DC Input and AC output over-current protection
DC input insulation ground fault 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
Smart Inverter Functions and Default Activation
The CPS SCH275KTL-DO/US-800 3-Phase String Inverters employ Smart Inverter
(Grid Support) functions in compliance with UL 1741-SA8-SA18 and UL1741-SB
standards. The default activation status is indicated below.
Smart Inverter 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. The
inverter 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

General Introduction
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significantly, which will trigger the inverter to cease operation and disconnect from the
grid.
DC Ground Fault Protection
The inverters include residual current detection GFCI as part of the DC ground fault
detection method required by UL 1741. If there is a ground fault in the PV array, the
ground fault detection circuitry will detect leakage current, trigger an alarm, and the
inverter will cease operation. See Chapter 6 for further information regarding GFCI
Static and Dynamic trip thresholds and operation.
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:
•“Standard 0.5μs - 100 kHz Ring Wave”
•“Standard1.2/50μs - 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 ziploc 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 items
No.
Item
QTY
Note
1
Inverter
1
2
Mounting bracket
1
Bracket upon which the PV inverter is hung
and mounted
3
Accessory bag
1
Includes accessories A-D
4
Accessory bag
1
Includes accessories E-K
5
Accessory bag
1
Includes accessories I-N
6
Accessory bag
1
Includes accessory O
7
Quick Guide
1
Quick Guide
A
M10x50 Hex.
combination bolt
6
For mounting bracket

Mechanical Installation
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B
M6x90 Hex.comb.
bolt
2
For fastening the inverter onto the
mounting bracket
C
M6x16 Comb. bolt
2
For external ground connection
D
M10 Lifting eyebolt
2
For lifting inverter
E
M10 nut
6
For mounting bracket
F
M10 flat gasket
6
For mounting bracket
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 bolt with
plastic flat washer
1
Spare for front cover
M
Handle
2
For lifting the inverter
N
6-pin connector plug
1
For RS485 communication
O
LINKIT
1
For mobile app interface via CPS Connect
Pro app
Table 3-1 Accessory list
IMPORTANT!
Additional accessories for the CPS SCH275KTL-DO/US-800 inverters are
available and can be purchased separately.
Pre-Installation Checklist
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.

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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 (floating).
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.
Metal Conduit Fittings are recommended to prevent propagation.
For detailed specification ranges and limits, see Chapter 9.
NOTICE: The allowable ambient temperature ranges for the CPS
SCH275KTL-DO/US-800 3-Phase String Inverters are defined based
on the following conditions:
Condition 1: -40°C to 70°C, Inverter not installed, and in storage (in
packaging or unpackaged).
Condition 2: -30°C to 60°C, Inverter installed, connected to electric
utility grid and operating during daylight hours.
Condition 3: No low temp limit to 70°C, Inverter installed, connected to
electric utility grid but non-operating (daylight or nighttime hours).
CPS advises against leaving inverters mounted
outdoors for an extended period of time (more than 90
days) and/or allowing inverters exposed to cycles of
freezing temperature without both DC and AC power
connected to the inverters under normal operation.
The CPS inverter enclosures are designed to conform
to NEMA4 (or IP65), however there exists the
possibility of water condensation inside the inverter
NOTICE:
Outdoor Installations for Extended Periods without Power

Mechanical Installation
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enclosure when it is left exposed to an outdoor
environment without power to operate for an extended
period of time. Moisture in the air could enter the
inverter during the time that the cover is opened for
wiring purposes. When the inverter is exposed to
temperature swings, especially in cold weather,
moisture inside the inverter could condense over the
aluminum heatsink area where inverter
semiconductors are mounted. Water droplets on the
heatsink may cause a short-circuit to live
semiconductor devices. When the PV source is
applied to the inverter, this PV power source could
cause the inverter to fail and result in a short-circuit
across the PV array.
If such a situation in which the inverter is mounted
outdoors without operating power occurs, CPS
recommends that the inverter be inspected for water
condensation before any DC orAC power can be
applied to inverter. Without inspection, customers will
run the risk of having inverter electronic circuit damage
when power is applied to inverter during startup. It is
advised that customers contact CPS for further advice
and to arrange schedule for CPS service personnel to
perform inspection of inverter on site.
CPS hotline: [phone]