CPS SCA Series User manual

CPS SCA Series Grid-tied PV Inverter
CPS SCA50KTL-DO/US-480
and SCA60KTL-DO/US-480
Installation and Operation Manual - Rev 3.4
CHINT POWER SYSTEMS AMERICA CO.
Revision 3.4 - January 2021

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,
Troubleshooting, 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
3.3.1
3.3.3.2
6.2.3
Sept 2020 DC Switch Fault Procedure
Wiring box bottom gland plate.
Factory installed fuse values
ISO-NE Protection Settings
3.4 2.11
3.3.3.2
Jan 2021 Add RSD PVRSS Table
PV Fuse replacement
clarification

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 (DEFAULT STATE): .................................. 12
2.5 APPEARANCE AND MAIN ITEM DESCRIPTION ...................................... 13
2.6 SCHEMATIC DIAGRAM AND CIRCUIT DESIGN ....................................... 14
2.7 ANTI-ISLANDING DETECTION........................................................... 16
2.8 DC GROUND FAULT PROTECTION ..................................................... 16
2.9 SURGE SUPPRESSION ..................................................................... 16
2.10 DC ARC-FAULT PROTECTION............................................................ 17
2.11 MODULE-LEVEL RAPID SHUTDOWN.................................................. 17
3INSTALLATION.............................................................................. 18
3.1 RECOMMENDATIONS BEFORE INSTALLATION ....................................... 20
3.2 MECHANICAL INSTALLATION ............................................................ 23
3.2.1 Dimensions .......................................................................... 23
3.2.2 Installation Method (see Figure 3-2) ................................... 23
3.2.3 Installation Space Requirement........................................... 25
3.2.4 Mounting the Inverter onto the Bracket.............................. 30
3.3 ELECTRICAL INSTALLATION............................................................... 39
3.3.1 Removing/Replacing the Wiring Box Cover:........................ 39
3.3.2 Wiring Boxes........................................................................ 41
3.3.3 DC Connection..................................................................... 43

3.3.4 AC and Ground Connection..................................................53
3.3.5 AC Connections ....................................................................55
3.4 COMMUNICATION CONNECTION ......................................................60
3.4.1 Description of the Communication Board............................61
3.4.2 RS485 Communication.........................................................61
3.4.3 RS485 Network Set-up .........................................................62
3.4.4 Communication Wiring........................................................64
4USER INTERFACE...........................................................................65
4.1 DESCRIPTION OF LCD PANEL ...........................................................65
4.2 OPERATION STATE .........................................................................67
4.3 INTERFACE TYPES...........................................................................68
5COMMISSIONING.........................................................................70
5.1 MECHANICAL INSTALLATION CHECK ...................................................70
5.2 CONDUCTOR CONNECTIONS CHECK...................................................70
5.3 ELECTRICAL CHECK ........................................................................70
5.4 COMMISSIONING STEPS..................................................................71
6MAIN MENU AND OPERATION......................................................78
6.1 MEASUREMENT DATA ....................................................................78
6.2 SETTING ......................................................................................79
6.2.1 System Parameters ..............................................................81
6.2.2 Control Command................................................................84
6.2.3 Protect Parameters..............................................................87
6.2.4 LVRT/HVRT Parameters........................................................92
6.2.5 Power Derating Setup..........................................................97
6.2.6 Reactive Power Derating Setup ...........................................98
6.2.7 Arc Parameters ..................................................................104
6.2.8 Other Parameters ..............................................................104

6.2.9 File Export (local)............................................................... 108
6.2.10 Firmware Update (local)............................................... 108
6.3 POWER ON/OFF ....................................................................... 108
6.3.1 Manual Power ON/OFF ..................................................... 108
6.3.2 Automatic Turn ON/OFF.................................................... 109
6.4 HISTORY RECORD ........................................................................ 109
6.5 DEVICE INFORMATION.................................................................. 110
6.6 START-UP.................................................................................. 111
6.7 SHUT-DOWN ............................................................................. 112
6.8 OPERATION MODE ...................................................................... 113
6.9 GRID-TIED POWER GENERATION .................................................... 113
6.10 FIRMWARE UPGRADE .................................................................. 114
7FAULT SHUTDOWN AND TROUBLESHOOTING............................. 116
7.1 LED FAULT AND TROUBLESHOOTING............................................... 116
7.2 LCD FAULT AND TROUBLESHOOTING .............................................. 117
8MAINTENANCE AND DE-INSTALLATION ...................................... 124
8.1 PRODUCT MAINTENANCE ............................................................. 124
8.1.1 Check Electrical Connections ............................................. 124
8.1.2 Clean the Air Vent Grate.................................................... 125
8.1.3 Replace the Cooling Fans................................................... 125
8.1.4 Replace the Inverter .......................................................... 127
8.2 DE-INSTALLING THE INVERTER........................................................ 130
9ACCESSORIES............................................................................. 131
9.1 FUSE BYPASS TERMINALS.............................................................. 131
9.1.1 Bypass Input Terminal Instructions.................................... 131
9.2 SHADE COVER (SSC-60ST) .......................................................... 134
9.2.1 Protection from Harsh Conditions..................................... 134

9.2.2 Increased Energy Production .............................................134
9.3 Y-COMB TERMINAL BLOCK (OPTIONAL)...........................................135
10 TECHNICAL DATA ........................................................................136
10.1 DATASHEET ................................................................................136
10.2 MEASUREMENT TOLERANCES ........................................................138
10.3 PRODUCTION GRAPHS..................................................................139
10.3.1 High Temperature Derating Graph ...............................139
10.3.2 Altitude Derating Graph ...............................................140
10.3.3 Grid Voltage Derating Graph ........................................141
10.3.4PV Voltage Derating Graph...........................................141
10.3.5Reactive Power Capability ............................................143
11 LIMITED WARRANTY ..................................................................144

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
SCA50KTL-DO/US-480 and CPS SCA60KTL-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 “Fault 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
"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 SCA50KTL-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 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 product 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.
CAUTION:
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.

7
INSTRUCTION:
Please check with your local electric utility supply company before
selecting a grid standard. If the i
nverter 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
If there is a fault and it is safe to access the inverter:
1. Read/record the fault code(s) displayed on the LCD interface.
2. Turn OFF the inverter via the LCD/Keypad or Remote access.
3. Turn OFF the AC feed breaker.
4. Turn OFF the AC Switch.
5. If possible, read the DC MPPT currents displayed on the LCD interface:
a. If the MPPT current is <30A or the irradiation is obviously low, turn OFF the
DC switch.
b. If it is safe to open the wire-box, proceed with troubleshooting procedures
listed in Table 7-1. Make sure appropriate safety precautions and PPE are
used.
6. If it is not possible to read the DC MPPT currents through the LCD 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-box.
b. Measure the DC current on each string. If zero, open the fuse holder for
each string reading approximately zero amps.
c. If the DC current is >0.25A, do not open the fuse holder.
d. When all possible fuses are open, measure the total MPPT current. If it is
<30A, 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. a. 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 AC and DC switches on the inverter and proceed with normal
troubleshooting procedures listed in Table 7-1.
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.

9
2 Overview
2.1 Inverter for grid-tied PV systems
CPS SCA50KTL-DO/US-480 and SCA60KTL-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

10
2.2 Product Features
High Conversion Efficiency:Advanced 3-level conversion topology with
Space-Vector PWM; Max. efficiency: 98.8%, CEC efficiency: 98.5%.
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 FlexOM gateway
card 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 optional accessory.
Refer to FlexOM gateway card 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: Uses thin-film and electrolytic 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, or the choice of two optional Rapid
Shutdown (RSD) wireboxes with integrated Sunspec PLC transmitters for
use with either Tigo TS4-F integrated smart modules and Tigo TS4-A-F
products, or APsmart RSD-S-PLC rapid shutdown MLPE’s.
High Protection Degree: Powder coated aluminum NEMA 4X enclosure
meets the demanding needs of both indoor and outdoor use.

11
Intelligent Integration: Integrated DC/AC disconnect switches, and up to
15 fused string inputs eliminate the need for external DC combiner 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 rated Active 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).

12
2.4 Smart Inverter Functions:
The CPS SCA50KTL-DO/US-480 and CPS SCA60KTL-DO/US-480 3-Phase
String Inverters employ Smart Inverter (Grid Support) Functions in compliance
with UL1741-SA, SA8-SA15. The default activation status is indicated below.
Smart Inverter Function IEEE1547-2014 Rule 21 ISO-NE
Anti-islanding Enabled Enabled Enabled
Low/High Voltage Ride-
Through
N/A Enabled Enabled
Low/High Frequency Ride-
Through
N/A Enabled Enabled
Dynamic Volt/VAR Operation N/A Enabled Disabled
Ramp Rate N/A Enabled Enabled
Fixed Power Factor N/A Disabled Disabled
Reconnect by “Soft-Start” N/A Enabled Enabled
Frequency-Watt N/A Enabled Disabled
Volt/Watt N/A Enabled Disabled

13
2.5 Appearance and Main Item Description
2
8
9
56 7
1
3
4
Figure 2-2 Diagram of the Inverter Assembley
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