CPS SCA Series User manual

CPS SCA Series Grid-tied PV Inverter
CPS SCA25KTL-DO/US-208
CPS SCA50KTL-DO/US-480
And SCA60KTL-DO/US-480
Installation and Operation Manual - Rev3.4
CHINT POWER SYSTEMS AMERICA CO.
Revision 3.4 - May 2020

Revision History
Rev
Number
Chap/Sec
Rev Date
Description
1.0
N/A
Aug 2016
Initial Release
2.0
3
Sep 2016
H4 Wirebox, Operating Mode
2.1
3
Feb 2017
H4 Termination, AC Terminal
2.2
3, 5, 7, 8
Sept 2017
AC Terminal, Parameters,
Trouble-Shooting, Accessories
3.0
3, 5, 6, 10
Feb 2018
Increased kVA Ratings
3.1
3
5
3.3
9.3
Mar 2019
Allow MPPT to be Unbalanced
Increased RS485 3pin Terminal
LCD interface
Parameters
Y-Comb Terminal
3.2
2, 3
Oct 2019
Added Rapid Shutdown Wirebox
Removed H4 Wirebox
Added water tight design/installation
requirements
3.3
1
3
3.2.2
3.2.4
3.3.3
Mar 2020
Add disclaimer
1) Update packing list
2) Wiring box bottom seal has been
cancelled.
Installation method pictures
Add Remark& Label
Change DC terminal description
In the DC fuse description, Change

3.3.5
3.4.1
6
10.1
10.3.3
Sinofuse into Busmann.
Change AC terminal description.
Delete wiring box bottom seal
description.
Modify the communication board
description.
Add ISO-NE regulation
Update partial settings
Update datasheet
Update 10.3.3 chapter curve and
description
3.4
August
2020
Add CPS SCA25KTL-DO/US-208
model description.

Table of Contents
BEFORE YOU START… ............................................................................... 1
1IMPORTANT SAFETY INSTRUCTIONS................................................ 3
2OVERVIEW ...................................................................................... 8
2.1 INVERTER FOR GRID-TIED PV SYSTEMS......................................................8
2.2 PRODUCT FEATURES .............................................................................8
2.3 PRODUCT PROTECTION AND FUNCTIONS.................................................10
2.4 SMART INVERTER FUNCTIONS (DEFAULT STATE): .......................................10
2.5 APPEARANCE AND MAIN ITEM DESCRIPTION ...........................................11
2.6 SCHEMATIC DIAGRAM AND CIRCUIT DESIGN............................................12
2.7 ANTI-ISLANDING DETECTION................................................................15
2.8 DC GROUND FAULT PROTECTION ..........................................................15
2.9 SURGE SUPPRESSION ..........................................................................15
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 (see Figure 3-2)......................................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 Boxes........................................................................38
3.3.3 DC Connection .....................................................................40

3.3.4 AC and Ground Connection ................................................. 50
3.3.5 AC Connections.................................................................... 53
3.4 COMMUNICATION CONNECTION...........................................................58
3.4.1 Description of the Communication Board ........................... 59
3.4.2 RS485 Communication ........................................................ 59
3.4.3 RS485 Network Set-up......................................................... 60
3.4.4 Communication Wiring ....................................................... 62
4USER INTERFACE............................................................................ 63
4.1 DESCRIPTION OF LCD PANEL................................................................ 63
4.2 OPERATION STATE.............................................................................. 65
4.3 INTERFACE TYPES...............................................................................66
5COMMISSIONING .......................................................................... 68
5.1 MECHANICAL INSTALLATION CHECK .......................................................68
5.2 CONDUCTOR CONNECTIONS CHECK ....................................................... 68
5.3 ELECTRICAL CHECK.............................................................................68
5.4 COMMISSIONING STEPS ......................................................................69
6MAIN MENU AND OPERATION ...................................................... 75
6.1 MEASUREMENT DATA.........................................................................75
6.2 SETTING...........................................................................................76
6.2.1 System Parameters.............................................................. 78
6.2.2 Control Command ............................................................... 80
6.2.3 Protect Parameters ............................................................. 84
6.2.4 LVRT/HVRT Parameters ....................................................... 92
6.2.5 Power Derating Setup ......................................................... 99
6.2.6 Reactive Power Derating Setup ......................................... 103
6.2.7 Arc Parameters.................................................................. 110
6.2.8 Other Parameters.............................................................. 110

6.3 POWER ON/OFF ............................................................................120
6.3.1 Manual Power ON/OFF......................................................120
6.3.2 Automatic Turn ON/OFF ....................................................120
6.4 HISTORY RECORD.............................................................................120
6.5 DEVICE INFORMATION.......................................................................121
6.6 START-UP.......................................................................................122
6.7 SHUT-DOWN ..................................................................................123
6.8 OPERATION MODE...........................................................................123
6.9 GRID-TIED POWER GENERATION .........................................................124
6.10 FIRMWARE UPGRADE.......................................................................124
7FAULT SHUTDOWN AND TROUBLESHOOTING ............................. 127
7.1 LED FAULT AND TROUBLESHOOTING....................................................127
7.2 LCD FAULT AND TROUBLESHOOTING....................................................128
8MAINTENANCE AND DE-INSTALLATION....................................... 134
8.1 PRODUCT MAINTENANCE ..................................................................134
8.1.1 Check Electrical Connections .............................................134
8.1.2 Clean the Air Vent Grate ....................................................134
8.1.3 Replace the Cooling Fans...................................................134
8.1.4 Replace the Inverter...........................................................137
8.2 DE-INSTALLING THE INVERTER.............................................................139
9ACCESSORIES .............................................................................. 141
9.1 FUSE BYPASS TERMINALS...................................................................141
9.1.1 Bypass Input Terminal Instructions ....................................141
9.2 SHADE COVER (SSC-60ST) ...............................................................143
9.2.1 Protection from Harsh Conditions .....................................143
9.2.2 Increased Energy Production .............................................143
9.3 Y-COMB TERMINAL BLOCK (OPTIONAL) ...............................................144

10 TECHNICAL DATA ......................................................................... 145
10.1 DATASHEET ................................................................................145
10.2 MEASUREMENT TOLERANCES........................................................148
10.3 PRODUCTION GRAPHS .................................................................149
10.3.1 High Temperature Derating Graph.................................... 149
10.3.2 Altitude Derating Graph.................................................... 150
10.3.3 Grid Voltage Derating Graph............................................. 151
10.3.4 Reactive Power Capability................................................. 153
11 LIMITED WARRANTY ................................................................... 154

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 SCA 25
KTL-DO/US-208、CPS SCA50KTL-DO/US-480 and CPS SCA 60KTL-DO /US-
480 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 1 “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 0 ”Installation”, 5
“Commisionning”, 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).

2
Installation, commissioning, troubleshooting, and maintenance of the inverter
must be done only by qualified personnel.
Thank you for choosing a CPS SCA 25 KTL-DO/US-208、CPS SCA 50KTL-
DO/US-480 or CPS SCA60KTL-DO/US-480 3-Phase String Inverter. These
PV Inverters are high performance and highly reliable products 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 25 KTL-DO/US-208、CPS SCA50KTL-DO/US-480 and CPS
SCA60KTL-DO/US-480
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.

5
Warnings and Markings on the product (cont'd)
WARNING:
For continued protection against risk of fire,
replace only with same type and ratings of fuse.
WARNING:
HAZARDOUS VOLTAGE AREA UNDER THE
PLASTIC COVER.
DO NOT OPEN FUSE HOLDERS UNDER
LOAD!
PERSONAL PROTECTIVE EQUIPMENT MUST
BE USED/WORN BEFORE ACCESSING
FUSES!
DO NOT OPEN FUSE HOLDERS IF BYPASS
TERMINALS ARE INSTALLED!
WARNING:
High touch current.
Earth connection essential before connecting
supply.
INFORMATION:
For more details please see the user manual.

6
WARNING:
All the installation and wiring connections must be performed by
qualified technical personnel. Disconnect the inverter from the
PV modules and the AC grid before maintaining or servicing the
equipment.
Risk of electric shock and fire. Use only with PV modules that
have a maximum system voltage of rating of 1000VDC or higher.
Electric shock Hazard. The DC conductors of this photovoltaic
system are normally ungrounded but will become intermittently
grounded without indication when the inverter performs the PV
array isolation measurement.
Shock Hazard. The inverter is energized from both AC and DC
sources. Disconnect all energy sources before servicing.
For continued protection against risk of fire, replace only with
same type and ratings of fuse.
DANGER:
Disconnect the inverter from the AC grid and PV modules
before removing covers or opening the equipment. Wait at least
5 minutes after disconnecting from the DC and AC sources
before servicing or maintaining the inverter. Ensure hazardous
high voltage and energy inside the inverter has been
discharged prior to servicing.
NOTICE:
The inverters are designed to only interconnect with an AC
power source as part of the public electric utility grid. Do not
connect the AC output of the inverters directly to any private
electric utility power equipment. The inverters are to be installed
with floating or ungrounded PV arrays only.

7
CAUTION:
CPS SCA 25 KTL-DO/US-208、CPS SCA50KTL-DO/US-480
and SCA60KTL-DO/US-480 inverters weigh approximately
56kg (123.5 pounds). The wirebox portion weighs
approximately 15kg (33 pounds).
Ensure the mounting bracket is properly installed before
hanging the inverter and wirebox on the bracket. A team of two
is recommended to lift and place the inverter and wirebox into
position.
INSTRUCTION:
Please check with your local electric utility supply company
before selecting a grid standard. 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 codes, rules and safety regulations
of the application is also not permitted.
WARNING:

8
2 Overview
2.1 Inverter for grid-tied PV systems
CPS SCA 25 KTL-DO/US-208、CPS SCA50KTL-DO/US-480 and SCA60
KTL- DO/US-480 3-Phase Transformerless String Inverters are designed for
use with an UNGROUNDED PV array in carport, commercial rooftop, and
large utility scale PV grid-tied systems. The system is generally made up of
PV modules, a 3-Phase String Inverter with a fused combiner/disconnect,
and AC power distribution equipment (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.
AC Grid
Bidirectional
electric meter
AC power
distribution
equipment
Figure 2-1: Grid-tied PV System
2.2 Product Features
High Conversion Efficiency: Advanced 3-level conversion topology
with Space-Vector PWM; SCA25KTL-DO/US-208 Max. efficiency: 97%,
CEC efficiency: 96.5%. SCA50/60KTL-DO/US-480 Max. efficiency:
98.8%, CEC efficiency: 98.5%.

9
Grid Adaptability: IEEE 1547 Interconnect Standard and CPUC Rule
21 applicable; Reactive Power; >0.99 PF (±0.8 adjustable), Selectable
Apparent Power rating enables Full Active Power rating to +/-0.91 PF,
and optional local or remote Active Power Curtailment.
Flexible Communication: Supports standard CPS Modbus RS485,
SunSpec Modbus, and HTTPS/XML communications via Flex Gateway
to ensure compatibility with 3rd party monitoring and control systems.
The Flex Gateway card enables further command/control as well as
remote firmware upgrades. (Flex Gateway card is optional accessory.
Refer to Flex Gateway manual for further detailed information.)
Wide DC input voltage range: Operating DC Input Voltage Range:
200-950VDC; Max DC input voltage: 1000VDC.
Long Service Life: Designed with thin-film capacitors to extend
inverter's service life.
3 MPPTs: Multi-channel MPPT (Maximum Power Point Tracker) enables
maximum design flexibility and energy harvest optimization over the life
of the system.
Separable Wirebox: The wirebox enables fused input of either discrete
wiring using the Standard wirebox, SCA50/60KTL-DO/US-480 optional
rapid shutdown wirebox with integrated Sunspec PLC transmitter for use
with APS、TS4-F integrated smart modules and APS、Tigo TS4-A-F
products, SCA25KTL-DO/US-208 have rapid shutdown wirebox with
integrated Sunspec PLC transmitter for use with APS smart modules
and APS products.
High Protection Degree: Powder coated aluminum NEMA 4X
enclosure meets the demanding needs of both indoor and outdoor use.
Intelligent Integration: Integrated DC/AC disconnect switches, and up
to 15 fused string inputs eliminate the need for external DC combiner

10
boxes, simplifying installation and the need for DC BOS equipment. The
rapid shutdown version wirebox has integrated the rapid shutdown PLC
transmitter, requiring no field wiring, and eliminated the negative DC
fuses in accordance with the 2017 National Electric Code.
2.3 Product Protection and Functions
AC output voltage and frequency monitoring
Anti-islanding detection with bi-directional frequency perturbation
DC input and AC output over-voltage protection
DC input and AC output over-current protection
DC input insulation to ground monitoring
DC injection of AC output
DC Arc-fault detection and circuit interruption
Leakage current to ground monitoring
Internal enclosure temperature monitoring
IGBT power module temperature monitoring
KVA overhead to produce ratedActive Power at 0.91 power factor
Load rejection over voltage (LROV) protection
No neutral connection required - delta connection permitted with
external AC GFCI
PVRSS certified rapid shutdown compliant to 2017 NEC
(RSD version only).
2.4 Smart Inverter Functions (default state):
Anti-Islanding –activated
Low/High Voltage Ride-Through –activated
Low/High Frequency Ride-Through –activated
Dynamic Volt/VAR Operations –activated
Ramp Rates –activated

11
Fixed Power Factor –deactivated
Reconnect by “Soft-Start” Methods –activated
Frequency-Watt –activated
Volt-Watt –activated
Set Active Power Function Mode (Optional) –activated under mutual
agreement
Dynamic Reactive Power Support Mode (Optional) –activated under
mutual agreement
2.5 Appearance and Main Item Description
2
8
5 6 7
1
3
4
9
Figure 2-2 Diagram of the Inverter Assembley

12
Main Items of the Inverter:
①Main inverter enclosure
②Inverter wirebox
③Inverter mounting bracket
④Cooling fans
⑤LED indicator lights
⑥User LCD display
⑦User Key buttons
⑧DC switch: DC power on/off
⑨AC switch: AC power on/off
2.6 Schematic Diagram and Circuit Design
The basic electrical schematic diagram of the CPS
SCA50/60KTL-DO/US-480、CPS SCA 25 KTL-DO/US-208 3-Phase String
Inverters are shown in Figure 2- 、Figure 2- and Figure 2-. The input from PV
source circuits passes through surge protection circuitry, DC EMI wave filters,
and independent DC-DC boost circuitry to achieve maximum power point
tracking and boost the voltages to a common DC bus. The inverter uses line
voltage and frequency measurements to synchronize to the grid and
converts the available PV energy to AC power by injecting balanced 3-phase
AC current into the electric utility grid. Any high frequency AC component is
removed by passing through a two-stage relay and EMI wave filter to
produce high quality AC power.