CPS SCA50KTL-DO/US-480 User manual

CPS SCA Series Grid-tied PV Inverter
CPS SCA50KTL-DO/US-480
and SCA60KTL-DO/US-480
Installation and Operation Manual - Rev 3.0
CHINT POWER SYSTEMS AMERICA CO.
Revision 3.0 - Feb 2018

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

Table of Contents
Before You Start…..................................................................................1
1. IMPORTANT SAFETY INSTRUCTIONS............................................3
2. Overview............................................................................................6
2.1. Inverter for grid-tied PV systems 6
2.2. Product Features 7
2.3. Product Protection Functions 8
2.4. Appearance and Main Item Description 9
2.5. Schematic Diagram and Circuit Design 10
2.6. Anti-islanding Detection 11
2.7. DC Ground Fault Protection 11
2.8. Surge Suppression 11
2.9. DC Arc-fault Protection 11
3. Installation .......................................................................................12
3.1. Recommendations before Installation 15
3.2. Mechanical Installation 17
3.3. Electrical Installation 31
4. User Interface ..................................................................................67
4.1 Description of LCD Panel 67
4.2 Operation State 69
4.3 Interface Types 70
4.4 Main Menu 72
4.4.1 Measurement Data........................................ 73
4.4.2 Setting........................................................... 74
4.4.3 Power ON/OFF.............................................. 99
4.4.4 History Record............................................... 100
4.4.5 Device Information ........................................ 101
5. Commissioning ...............................................................................102
5.1 Mechanical Installation 102
5.2 Conductor Connections 102
5.3 Electrical Check 102
5.4 Commissioning Steps 103

6Operation..........................................................................................109
6.1 Start-Up 109
6.2 Shut-Down 109
6.3 Operation Mode 110
6.4 Grid-tied Power Generation 110
6.5 Firmware Upgrade 111
7Maintenance and De-installation....................................................113
7.1 Product Maintenance 113
7.1.1 Check Electrical Connections........................113
7.1.2 Clean the Air Vent Grate................................113
7.1.3 Replace the Cooling Fans .............................114
7.1.4 Replace the Inverter......................................115
7.2 De-installing the Inverter 117
8Fault Shutdown and Troubleshooting ...........................................118
8.1 LED Fault and Troubleshooting 118
8.2 LCD Fault and Troubleshooting 119
9Accessories .....................................................................................126
9.1 Fuse Bypass Terminals 126
9.1.1 Bypass Input Terminal Instructions: ...............126
9.2 Shade Cover (SSC-60ST) 128
9.2.1 Protection from Harsh Conditions..................128
9.2.2 Increased Energy Production.........................128
10 Technical Data..................................................................................129
10.1Datasheet 129
10.2Measurement Tolerances 131
10.3Production Graphs 132
10.3.1Input Voltage Derating Graph ........................132
10.3.2High Temperature Derating Graph.................136
10.3.3Altitude Derating Graph .................................136
10.3.4Grid Voltage Derating Graph..........................137
11 Limited Warranty .............................................................................138

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 2 “Overview”, 5 “User Interface", 6 "Operation”,
and 8 "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”, 4 "Commissioning", 7 “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 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.
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
Markings on the product
HIGH VOLTAGE:
This inverter operates with high voltages. All work on the inverter
must only be performed as described in this document.
HOT SURFACE:
The inverter is designed to meet international safety standards, but
surfaces can become hot during operation. Do not touch the heat
sink or peripheral surfaces during or shortly after operation.
EARTH GROUND:
This symbol marks the location of the grounding terminal, which
must be securely connected to Ground through the AC EGC
(Equipment Grounding Conductor) to ensure operational safety.
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.

5
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.
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.

6
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
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

7
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), 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 to ensure compatibility with 3rd
party monitoring and control systems. Flex Gateway enables further
command/control as well as remote firmware upgrades.
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) enable
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 an optional H4 wirebox with quick-fit connectors
for connection of industry standard conductor assemblies.
High protection degree: Powder coated aluminum NEMA 4X enclosure
meets the demanding needs of both indoor and outdoor use.
Intelligent Integration: Integrated load break rated 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.

8
2.3. Product Protection Functions
Reverse polarity protection of DC input
AC and DC Short circuit protection
Arc-fault detection and circuit interruption
Anti-islanding detection with bi-directional frequency perturbation
DC Input and AC output over-voltage protection
DC Input over-current protection
DC input insulation against ground monitoring
DC injection of AC output
AC output voltage and frequency monitoring
Leakage current against ground monitoring
Internal enclosure temperature monitoring
IGBT power module temperature monitoring

9
2.4. Appearance and Main Item Description
2
8
9
567
1
3
4
Figure 2-3 Diagram of the Inverter assembly
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

10
2.5. Schematic Diagram and Circuit Design
The basic electrical schematic diagram of CPS SCA50KTL-DO/US-480 and
SCA60KTL-DO/US-480 inverters are shown in Figure 2-2. 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 toAC 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.
WIRE BOX INVERTER POWER HEAD
L1
L2
L3
N
PV1+
PV1+
PV1+
PV1+
PV1+
PV1-
PV1-
PV1-
PV1-
PV1-
MPPT1
MPPT2
AC
Output
PV Input
PV2+
PV2+
PV2+
PV2+
PV2+
PV2-
PV2-
PV2-
PV2-
PV2-
AC
Switch
Fuses
MPPT3
PV3+
PV3+
PV3+
PV3+
PV3+
PV3-
PV3-
PV3-
PV3-
PV3-
DC SPD
PV1+
DC Switch
Three
level
inverter
AFD
PV2+
PV3+
PV-
PE
AC SPD
Figure 2-2 Schematic Diagram of the CPS SCA50/60KTL-DO/US-480 Inverter

11
2.6. Anti-islanding Detection
The SCA50KTL-DO/US-480 and SCA60KTL-DO/US-480 inverters include
Unintentional Islanding detection as required by UL 1741/IEEE 1547. The
inverter will continuously make bi-directional perturbations to the frequency of
the output current by injecting a small amount of reactive power 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 significantly, which will trigger the inverter to cease
operation and disconnect from the grid.
2.7. 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 5 for further
information regarding GFCI Static and Dynamic trip thresholds and operation.
2.8. Surge Suppression
Standard Waveform Peak Values
Surge Category
Ring Wave
Combination Wave
B
6kV/0.5kA
6kV/3kA
"Standard 1.2/50 μs - 8/20 us Combination Wave"
"Standard 0.5 μs - 100 kHz Ring Wave"
2.9. DC Arc-fault Protection
The inverters include DC Arc-fault detection compliant with UL 1699B. The
inverter will detect electrical noise that is indicative of a DC series arc. Upon
detection of an arc-fault, the inverter will cease operation.

12
3. Installation
This chapter describes the planning and installation procedures for the
SCA50KTL-DO/US-480 and SCA 60KTL-DO/US-480 inverters. Please read
carefully and install the products following the step-by-step instructions.
The inverter and other main items are shipped in two separate packages,
consisting of A.) the main inverter enclosure and B.) the wirebox, mounting
bracket, user manual, and accessory kit. Before installation, please check that
the following items are included in the packages:
Table 3-1 Main Items
No.
Item
Q’ty
Note
Box
(1)
Main enclosure of
the PV inverter
1
A
(2)
Wiring box of the
PV inverter
1
B
(3)
Mounting bracket
1
Bracket upon which the PV inverter
is hung and mounted
B
(4)
User manual
1
PV inverter installation and
operation manual
B
(5)
Accessory kit
1
Kit contains all necessary hardware
and accessories for installation
B

13
Note that the items in the Accessory Kits vary between the Standard wirebox
and H4 wirebox, the items listed below:
Table 3-2 Accessory Kit (Standard wirebox)
No.
Item
Q’ty
Note
(1)
M8 Expansion Anchors
8
For attaching the mounting bracket to
a concrete wall or surface
(2)
M8×25mm machine
bolts with integrated
lock washer
8
Used with M8 expansion anchors
(3)
M6 X18mm Phillips
screw
11
4 for securing the wiring box to the
main enclosure; 6 for securing the
inverter to the mounting bracket; 1 for
the External Ground connection
(4)
5 pin PCB connector
plug
1
For the RS485 communication
(5)
#10 AWG Wire ferrules*
33
30 for PV conductors, includes 3
spares
(6)
M8 Nut
4
For the AC terminal block
(7)
M8 Flat washer
4
For the AC terminal block
(8)
M8 Spring washer
4
For the AC terminal block
*Wire ferrules included in the accessories are not mandatory for installation.

14
Table 3-3 Accessory Kit (H4 wirebox)
No.
Item
Q’ty
Note
(1)
M8 Expansion Anchors
8
For attaching the mounting bracket to
concrete wall or surface
(2)
M8×25mm machine
bolts with integrated
lock washer
8
Used with M8 expansion anchors
(3)
M6 X18mm Phillips
screw
11
4 for securing the wiring box to the
main enclosure; 6 for securing the
inverter to the mounting bracket; 1 for
the External Ground connection
(4)
5 pin PCB connector
plug
1
For the RS485 communication
(5)
PV Connector (Male)
15
For the PV input. #14 AWG contact
(6)
PV Connector (Female)
15
For the PV input. #14 AWG contact
(7)
Tool for PV Connector
1
For assembling/disconnecting PV
Connector
(8)
M8 Nut
4
For the AC terminal block
(9)
M8 Flat washer
4
For the AC terminal block
(10)
M8 Spring washer
4
For the AC terminal block
INSTRUCTION:
The items in the Accessory Kit Table 3-2 and Table 3-3 above are for
the standard configuration. The accessories provided may vary if
optional parts are purchased.