CPS SCA36KTL-DO/US-480 User manual

CPS SCA Series Grid-tied PV Inverter
CPS SCA36KTL-DO/US-480
CPS SCA50KTL-DO/US-480
CPS SCA60KTL-DO/US-480
Installation and Operation Manual - Rev 4.0
CHINT POWER SYSTEMS AMERICA CO.
Revision 4.0 –June 2023

Revision History
Rev.
Chap/Sec
Description
Date
1.0
N/A
Initial Release
Aug 2016
2.0
3
H4 Wirebox, Operating Mode
Sep 2016
2.1
3
H4 Termination, AC Terminal
Feb 2017
2.2
3, 5, 7, 8
AC Terminal, Parameters,
Troubleshooting, Accessories
Sept 2017
3.0
3, 5, 6, 10
Increased kVA Ratings
Feb 2018
3.1
3
Allow MPPT to be Unbalanced
Mar 2019
5
Increased RS485 3pin
Terminal
3.3
LCD interface
9.3
Parameters
Y-Comb Terminal
3.2
2, 3
AddedRapidShutdown
Wirebox
Removed H4 Wirebox
Added water tight
design/installation
requirements
Oct 2019
3.3
1
DC Switch Fault Procedure
Sept 2020
3.3.1
Wiring box bottom gland plate.
3.3.3.2
Factory installed fuse values
6.2.3
ISO-NE Protection Settings
3.4
2.11
Added RSD PVRSS Table
Jan 2021
3.3.3.2
PV Fuse replacement
clarification

3.5
2.2
2.4
2.11
3.3.3.5
3.5
6.2
10
Updated Tigo and APS types;
Added CPS SCA36KTL-
DO/US-480;
Updated register parameters
Updated datasheet
Added Tigo RSS Transmitter
August,
2022
3.6
3.3.3.1
3.3.3.5
Changed DC Input
Specifications
Deleted the specific DC
Connection for 36kw wirebox
Feb., 2023
3.7
2.4
3.2.3
10
Updated smart functions
Changed baffle spacing values
Updated datasheet
Apr., 2023
3.8
2.5
3.3
Updated pictures
Apr., 2023
3.9
10
Changed Max PV Power per
MPPT
May, 2023
4.0
Updated RSD information
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 (DEFAULT STATE): .................................. 12
2.5 APPEARANCE AND MAIN ITEM D ESCRIPTION ................................................. 13
2.6 SCHEMATIC DIAGRAM AND CIRCUIT DESIGN ................................................. 14
2.7 A NTI -I SLANDING D ETECTION ........................................................................... 16
2.8 DC GROUND FAULT PROTECTION .................................................................. 16
2.9 SURGE S UPPRESSION ........................................................................................ 16
2.10 DC A RC - FAULT P ROTECTION ............................................................................ 17
2.11 MODULE-LEVEL RAPID SHUTDOWN .............................................................. 17
3INSTALLATION ............................................................................. 18
3.1 R ECOMMENDATIONS B EFORE I NSTALLATION .................................................. 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 .............................. 29
3.3 ELECTRICAL INSTALLATION.............................................................................. 37
3.3.1 Removing/Replacing the Wiring Box Cover.......................... 37
3.3.2 Wiring Boxes ........................................................................ 39
3.3.3 DC Connection ..................................................................... 41

3.3.4 AC and Ground Connection ..................................................52
3.3.5 AC Connections ....................................................................54
3.4 C OMMUNICATION CONNECTION.................................................................... 59
3.4.1 Description of the Communication Board ............................60
3.4.2 RS485 Communication .........................................................60
3.4.3 RS485 Network Set-up .........................................................61
3.4.4 Communication Wiring ........................................................62
4USER INTERFACE...........................................................................64
4.1 DESCRIPTION OF LCD PANEL ......................................................................... 64
4.2 OPERATION STATE .......................................................................................... 65
4.3 I NTERFACE TYPES ............................................................................................ 67
5COMMISSIONING .........................................................................69
5.1 M ECHANICAL I NSTALLATION CHECK ................................................................. 69
5.2 C ONDUCTOR C ONNECTIONS CHECK ................................................................ 69
5.3 ELECTRICAL CHECK.......................................................................................... 69
5.4 C OMMISSIONING STEPS.................................................................................. 70
6MAIN MENU AND OPERATION......................................................77
6.1 MEASUREMENT DATA .................................................................................... 77
6.2 SETTING........................................................................................................... 78
6.2.1 System Parameters ...............................................................80
6.2.2 Control Command................................................................83
6.2.3 Protect Parameters ...............................................................86
6.2.4 LVRT/HVRT Parameters ........................................................91
6.2.5 Power Derating Setup ..........................................................96
6.2.6 Reactive Power Derating Setup ..........................................100
6.2.7 Arc Parameters ...................................................................106
6.2.8 Other Parameters....................................................................106

6.3 POWER ON/OFF........................................................................ 111
6.3.1 Manual Power ON/OFF ..................................................... 111
6.3.2 Automatic Turn ON/OFF .................................................... 111
6.4 HISTORY RECORD..........................................................................................112
6.5 DEVICE INFORMATION..................................................................................112
6.6 S TART -U P ......................................................................................................113
6.7 S HUT - DOWN.................................................................................................114
6.8 O PERATION MODE........................................................................................115
6.9 GRID-TIED POWER GENERATION..................................................................115
6.10 FIRMWARE UPGRADE ...................................................................................116
7FAULT SHUTDOWN AND TROUBLESHOOTING ..............................119
7.1 LED FAULT AND TROUBLESHOOTING...........................................................119
7.2 LCD FAULT AND TROUBLESHOOTING...........................................................120
8MAINTENANCE AND DE-INSTALLATION .......................................127
8.1 PRODUCT MAINTENANCE.............................................................................127
8.1.1 Check Electrical Connections.............................................. 127
8.1.2 Clean the Air Vent Grate .................................................... 128
8.1.3 Replace the Cooling Fans................................................... 128
8.1.4 Replace the Inverter........................................................... 130
8.2 DE-INSTALLING THE INVERTER ......................................................................130
9ACCESSORIES ..............................................................................134
9.1 FUSE BYPASS TERMINALS..............................................................................134
9.1.1 Bypass Input Terminal Instructions .................................... 134
9.2 SHADE COVER (SSC-60ST)........................................................... 137
9.2.1 Protection from Harsh Conditions...................................... 137
9.2.2 Increased Energy Production............................................. 137
9.3 Y-COMB TERMINAL BLOCK (OPTIONAL)........................................... 138

10 TECHNICAL DATA........................................................................139
10.1 DATASHEET ...................................................................................................139
10.2 M EASUREMENT T OLERANCES ........................................................................141
10.3 PRODUCTION GRAPHS..................................................................................142
10.3.1 High Temperature Derating Graph................................143
10.3.2 Altitude Derating Graph................................................ 142
10.3.3 Grid Voltage Derating Graph.........................................143
10.3.4 PV Voltage Derating Graph ...........................................144
10.3.5 Reactive Power Capability .............................................147
11 LIMITED WARRANTY...................................................................148

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
SCA36KTL-DO/US-480, 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.

3
Thank you for choosing a CPS SCA36KTL-DO/US-480, 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 SCA36KTL-DO/US-480, 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 andAC 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:
The main enclosure of CPS SCA36/50/60KTL-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 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
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 LCD interface.
2. Turn OFF the inverter via the LCD/Keypad or Remote access.
3. Turn OFF theAC feed breaker.
4. Turn OFF theAC 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 theAC 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.

9
AC Grid
Bidirectional
electric meter
AC power
distribution
equipment
2 Overview
INSTRUCTION:
The contents of following sections are applicable to all the CPS
SCA36/50/60KTL-DO/US-480 3-Phase transformerless string
inverters.
2.1 Inverter for grid-tied PV systems
CPS SCA36/50/60KTL-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.
Figure 2-1: Grid-tied PV System

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156
2.2 Product Features
▪High Conversion Efficiency: Advanced 3-level conversion topology with
Space-Vector PWM; Max. efficiency: 98.8%.
▪Grid Adaptability: Selectable grid standards: IEEE 1547-2018, ISO-NE,
CA Rule 21, and HECO; Reactive Power; >0.99 PF (±0.8 adjustable),
Selectable Apparent Power rating of 50/60kW models 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 Rapid Shutdown (RSD) wireboxes
with integrated PLC transmitters for use with APS RSD-S-PLC/RSD-D
products.

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156
▪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 boxes,
simplifying installation and the need for DC BOS equipment. The rapid
shutdown version wireboxes have integrated the rapid shutdown PLC
transmitter, requiring no field wiring, and eliminated the negative DC fuses
in accordance with the 2017/2020 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 andAC output over-voltage protection
✓DC input andAC output over-current protection
✓DC input insulation to ground monitoring
✓DC injection of AC output
✓DCArc-fault detection and circuit interruption
✓Leakage current to ground monitoring
✓Internal enclosure temperature monitoring
✓IGBT power module temperature monitoring
✓KVA overhead to enable full rated Active Power from unity PF to 0.91 PF
(Only for SCA50/60KTL)
✓Load rejection over voltage (LROV) protection
✓No neutral connection required - delta connection permitted with external
AC GFCI
✓PVRSS certified rapid shutdown compliant to 2017/2020 NEC (with
RSD version wireboxes only).

12
2.4 Smart Inverter Functions:
The CPS SCA36/50/60KTL-DO/US-480 3-Phase String Inverters employ Smart
Inverter (Grid Support) Functions in compliance with UL1741, 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
Disabled
Ramp Rate
Enabled
Enabled
Enabled
Fixed Power Factor
Enabled
Disabled
Disabled
Reconnect by “Soft-Start”
Enabled
Enabled
Enabled
Frequency-Watt
Disabled
Enabled
Disabled
Volt/Watt
Enabled
Enabled
Disabled

13
2.5 Appearance and Main Item Description
Figure 2-2 Diagram of the Inverter Assembly
Main Items of the Inverter:
① Main inverter enclosure
② Inverter wirebox
③ Inverter mounting bracket
④ Cooling fans
⑤ LED indicator lights
⑥ User LCD display
⑦ User Key buttons
⑧DC switch: DC power on/off
⑨AC switch: AC power on/off