CPS SCA25KTL-DO/US-208 User manual

CPS SCA Series Grid-tied PV Inverter
CPS SCA25KTL-DO/US-208
Installation and Operation Manual – Rev 1.2
CHINT POWER SYSTEMS AMERICA CO.
Revision 1.2 - June 2023

Table of Contents
BEFORE YOU START….............................................................................. 1
1IMPORTANT SAFETY INSTRUCTIONS .............................................. 3
2OVERVIEW .................................................................................... 9
2.1 INVERTER FOR GRID-TIED PV SYSTEMS......................................................9
2.2 PRODUCT FEATURES ...........................................................................10
2.3 PRODUCT PROTECTION AND FUNCTIONS.................................................11
2.4 SMART INVERTER FUNCTIONS...............................................................12
2.5 APPEARANCE AND MAIN ITEM DESCRIPTION...........................................13
2.6 SCHEMATIC DIAGRAM AND CIRCUIT DESIGN............................................14
2.7 ANTI-ISLANDING DETECTION................................................................15
2.8 DC GROUND FAULT PROTECTION ..........................................................15
2.9 SURGE SUPPRESSION ..........................................................................16
2.10 DC ARC-FAULT PROTECTION.................................................................16
2.11 MODULE-LEVEL RAPID SHUTDOWN.......................................................16
3INSTALLATION ..............................................................................17
3.1 RECOMMENDATIONS BEFORE INSTALLATION ............................................19
3.2 MECHANICAL INSTALLATION .................................................................22
3.2.1 Dimensions.............................................................................22
3.2.2 Installation Method ...............................................................22
3.2.3 Installation Space Requirement .............................................24
3.2.4 Mounting the Inverter onto the Bracket ................................28
3.3 ELECTRICAL INSTALLATION....................................................................36
3.3.1 Removing/Replacing the Wiring Box Cover: ..........................36
3.3.2 Wiring Box..............................................................................38
3.3.3 DC and Ground Connection....................................................41
3.3.4 AC and Ground Connection ....................................................50

3.4 COMMUNICATION CONNECTION...........................................................57
3.4.1 Description of the Communication Board.............................. 58
3.4.2 RS485 Communication........................................................... 58
3.4.3 RS485 Network Set-up ........................................................... 59
3.4.4 Communication Wiring.......................................................... 61
4USER INTERFACE.......................................................................... 62
4.1 DESCRIPTION OF LCD PANEL ...............................................................62
4.2 OPERATION STATE..............................................................................64
4.3 INTERFACE TYPES ...............................................................................65
5COMMISSIONING ........................................................................ 67
5.1 MECHANICAL INSTALLATION CHECK .......................................................67
5.2 CONDUCTOR CONNECTIONS CHECK .......................................................67
5.3 ELECTRICAL CHECK.............................................................................67
5.4 COMMISSIONING STEPS ......................................................................68
6MAIN MENU AND OPERATION..................................................... 74
6.1 MEASUREMENT DATA......................................................................... 74
6.2 SETTING...........................................................................................76
6.2.1 System Parameters ................................................................ 78
6.2.2 Control Command.................................................................. 80
6.2.3 Protect Parameters................................................................ 83
6.2.4 LVRT/HVRT Parameters.......................................................... 88
6.2.5 Power Derating Setup............................................................ 93
6.2.6 Reactive Power Derating Setup ............................................. 97
6.2.7 Arc Parameters .................................................................... 102
6.2.8 Other Parameters ................................................................ 103
6.3 POWER ON/OFF............................................................................108
6.3.1 Manual Power ON/OFF........................................................ 108

6.3.2 Automatic Turn ON/OFF.......................................................108
6.4 HISTORY RECORD .............................................................................109
6.5 DEVICE INFORMATION.......................................................................110
6.6 START-UP.......................................................................................111
6.7 SHUT-DOWN ..................................................................................111
6.8 OPERATION MODE ...........................................................................111
6.9 GRID-TIED POWER GENERATION .........................................................112
6.10 FIRMWARE UPGRADE .......................................................................113
7FAULT SHUTDOWN AND TROUBLESHOOTING .............................116
7.1 LED FAULT AND TROUBLESHOOTING....................................................116
7.2 LCD FAULT AND TROUBLESHOOTING....................................................117
8MAINTENANCE AND DE-INSTALLATION.......................................123
8.1 PRODUCT MAINTENANCE ..................................................................123
8.1.1 Check Electrical Connections................................................123
8.1.2 Clean the Air Vent Grate ......................................................123
8.1.3 Replace the Cooling Fans .....................................................123
8.1.4 Replace the Inverter .............................................................126
8.2 DE-INSTALLING THE INVERTER.............................................................128
9ACCESSORIES..............................................................................130
9.1 SHADE COVER (SSC-60ST) ...............................................................130
9.1.1 Protection from Harsh Conditions........................................130
9.1.2 Increased Energy Production ...............................................130
9.2 Y-COMB TERMINAL BLOCK (OPTIONAL)...............................................131
10 TECHNICAL DATA ........................................................................132
10.1 DATASHEET .....................................................................................132
10.2 MEASUREMENT TOLERANCES .............................................................135
10.3 PRODUCTION GRAPHS ......................................................................136
10.3.1 High Temperature Derating Graph ......................................136

10.3.2 Altitude Derating Graph ...................................................... 136
10.3.3 Grid Voltage Derating Graph............................................... 137
10.3.4 PV Voltage Derating Graph.................................................. 138
10.3.5 Reactive Power Capability ................................................... 139
11 LIMITED WARRANTY.................................................................. 140

1
Before You Start…
Scope
This Installation and Operation manual contains important information, safety
guidelines, detailed planning and setup information for installation, as well as
information about configuring, operating and troubleshooting the CPS
SCA25KTL-DO/US-208 3-Phase String Inverters. Here after in this manual this
equipment may be referred to simply as the inverters. Be sure to read this
manual carefully before operating or servicing the inverters.
Audience
The information in Chapters 2 “Overview”, 4 “User Interface”, 6 “Main Menu
and Operation”, 7 “Faut Shutdown and troubleshooting”, and 9 ”Accessories”
is intended for the owner and operator of the inverter, and does not require any
special training or qualifications. The information in Chapters 3 ”Installation”, 5
“Commissioning”, 8 ”Maintenance and De-installation”is intended for qualified
personnel only. Qualified personnel have training, knowledge, and experience
in:
▪Installing electrical equipment and PV power systems (up to
1000VDC).
▪Applying all local installation codes.
▪Analyzing and eliminating the hazards involved in performing
electrical work.
▪Selecting and using Personal Protective Equipment (PPE).
Installation, commissioning, troubleshooting, and maintenance of the inverter
must be done only by qualified personnel.

2
Thank you for choosing a CPS SCA25KTL-DO/US-208 3-Phase String Inverter.
This PV Inverter is a high performance and highly reliable product specifically
designed for the North American Solar market.
Instructions inside this user manual will help you solve most installation and
operation difficulties. Installation, commissioning, troubleshooting, and
maintenance of the inverter must be performed by qualified personnel. If you
encounter any problems during installation or operation of this unit, first check
the user manual before contacting CPS Customer Service. This user manual
is applicable for the following models:
CPS SCA 25KTL-DO/US-208
Please keep this user manual on hand for quick reference.
The manual will be periodically updated or revised due to the product
development or improvement. The latest version of this manual can be
acquired via the website at www.chintpowersystems.com.

3
1 Important Safety Instructions
(SAVE THESE INSTRUCTIONS)
Please read this user manual carefully before installation of the inverter. CPS
reserves the right to refuse warranty claims for equipment damage if the user
fails to install the product 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
DANGER:
DANGER indicates a hazardous situation which, if not avoided,
will result in death or serious injury.
WARNING:
WARNING indicates a hazardous situation which, if not avoided,
could result in death or serious injury.
CAUTION:
CAUTION indicates a hazardous situation which, if not avoided,
could result in minor or moderate injury.
NOTICE:
NOTICE indicates a hazardous situation which, if not avoided,
could result in the inverter working abnormally or property loss.
INSTRUCTION:
INSTRUCTION indicates important supplementary information or
provides skills or tips that can be used to help you solve a
problem or save you time.

4
Warnings and Markings on the product
CAUTION:
Risk of electric shock from energy stored in capacitor.
Do not remove cover until 5 minutes after disconnecting all
sources of supply.
CAUTION:
Risk of electric shock, do not remove cover. No user
serviceable parts inside. Refer servicing to qualified service
personnel.
WARNING:
Electric shock hazard. The DC conductors of this
photovoltaic system are ungrounded and may be energized.
CAUTION:
Risk of Electric Shock.
a) Both ac and dc voltage sources are terminated inside this
equipment. Each circuit must be individually disconnected
before servicing.
b) When the photovoltaic array is exposed to light, it supplies
a dc voltage to this equipment.
WARNING:
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.
CAUTION:
Hot surfaces. To reduce the risk of burns. Do not touch.