CPS SCA Series User manual

CPS SCA Series Grid-tied PV Inverter
CPS SCH100KTL-DO/US-600
and SCH125KTL-DO/US-600
Installation and Operation Manual - Rev 1.0
CHINT POWER SYSTEMS AMERICA CO.
REVISON 1.0 FEB 2018

Table of Contents
Before You Start… .................................................................................. 1
Chapter 1 IMPORTANT SAFETY INSTRUCTIONS ................................ 2
Chapter 2 Overview ................................................................................ 5
2.1 Inverter for Grid-tied PV Systems ......................................... 5
2.2 Product Features .................................................................. 5
2.3 Product Protection Functions................................................ 6
2.4 Schematic Diagram and Circuit Design ................................ 7
2.5 Appearance and Main Item Description ................................ 8
2.6 Anti-islanding Detection ........................................................ 9
2.7 DC Ground Fault Protection ................................................. 9
2.8 Surge Suppression ............................................................... 9
2.9 DC Arc-fault Protection ......................................................... 9
Chapter 3 Installation ............................................................................. 10
3.1 Recommendations Before Installation .................................. 12
3.2 Mechanical Installation ......................................................... 13
3.3 Electrical Installation ............................................................. 27
3.3.1 Removing/Replacing the Wire-box Cover .............. 27
3.3.3 DC Connection ...................................................... 31
3.3.4 AC and Ground Connection ................................... 36
3.3.5 Communication Connection ................................... 44
Chapter 4 Commissioning (Via internal Wireless ) .............................. 49
4.1 Commissioning Checklist ..................................................... 49
4.1.1 Mechanical Installation .......................................... 49
4.1.2 Conductor Connections ......................................... 49
4.1.3 Electrical Check ..................................................... 49
4.2 Commissioning Steps ........................................................... 50
4.3 Connection to the inverter – Wireless ................................... 50
Chapter 5 APP Interface ......................................................................... 54
5.1 Overview .............................................................................. 54
5.2 Main Menu ............................................................................ 54
5.3 Running Data........................................................................ 55
5.4 Settings ................................................................................ 56
5.4.1 Inverter Parameters ............................................... 57
5.4.2 Read/Write Register .............................................. 58
5.4.2.1 Commands ................................................ 59
5.4.2.2 Enable/Disable........................................... 62
5.4.2.3 Protect ....................................................... 63
5.4.2.4 LVRT/HVRT ............................................... 67

5.4.2.5 Active Power Derating ................................ 71
5.4.2.6 Reactive Power Derating ............................ 73
5.4.2.7 Others ........................................................ 76
5.4.3 Fault Recording .......................................................... 78
5.4.4 Firmware Upgrade ..................................................... 78
5.5 History .................................................................................. 82
5.6 Turn ON/OFF ....................................................................... 82
Chapter 6 Fault Shutdown and Troubleshooting ................................. 84
6.1 LED Fault and Troubleshooting ............................................ 84
Chapter 7 Product Maintenance ............................................................ 93
7.1 Check Electrical Connections ............................................... 93
7.2 Clean the Air Vent Filter ....................................................... 93
7.3 Replace the Cooling Fans .................................................... 93
7.4 Replace the Inverter ............................................................. 95
Chapter 8 Technical Data ....................................................................... 98
Chapter 9 Limited Warranty ................................................................... 103

1
Before You Start…
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 SCH100KTL-DO/US-600 and CPS SCH125KTL-DO/US-600
Utility Grid-tied PV Inverters. Be sure to read this manual carefully before
using.
Thank you for choosing a CPS Grid-tied PV Inverter. This PV Inverter is a
high performance and highly reliable product specifically designed for the
North American Solar market.
Installation, commissioning, troubleshooting, and maintenance of the inverter
must be done only by qualified personnel. If you encounter any problems
during installation or operation of this unit, first check the user manual before
contacting your local dealer or supplier. This user manual is applicable for the
following models:
CPS SCH100KTL-DO/US-600 and CPS SCH125KTL-DO/US-600
Instructions inside this user manual will help you solve most installation and
operation difficulties. Contact your local supplier if the problem still exists.
Please keep this user manual on hand for quick reference.

2
Chapter 1 IMPORTANT SAFETY INSTRUCTIONS
(SAVE THESE INSTRUCTIONS)
Please read this user manual carefully before product installation. CPS
reserves the right to refuse warranty claims for equipment damage if the user
fails to install the equipment 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 equipment 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.

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WARNING:
All installation and wiring connections should be performed only by
qualified technical personnel. Disconnect the inverter from PV
modules and the AC grid before maintaining and operating the
equipment.
Risk of electric shock and fire. Use only with PV modules that have
a maximum system voltage of rating of 1500V 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 measures the PV array
isolation.
Shock Hazard. The inverter is energized from both ac and dc
sources. Disconnect all sources before servicing.
For continued protection against risk of fire, replace fuses only with
same type and ratings.
DANGER:
Please disconnect the inverter from AC grid and PV modules before
opening the equipment. Make sure hazardous high voltage and energy
inside the equipment has been discharged.
Do not operate or maintain the inverter until at least 5 minutes
after
disconnecting all sources from DC and AC sides.
NOTICE:
This inverter is designed to connect AC power only to the public grid.
Do not connect the AC output of this equipment directly to any private
AC power equipment.

4
Markings on the product
HIGH VOLTAGE:
This inverter works with high voltages. All work on the product
must only be performed as described in this document.
HOT SURFACE:
The equipment 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 the earth through the PE
(protective earthing) cable to ensure operational safety.
CAUTION:
CPS SCH100KTL-DO/US-600 and SCH125KTL-DO/US-600
inverters
are approx. 55kg (121 pounds). The wire-
box portion of the inverters
are approx. 25kg (55pounds)/ standard wire-box or
15kg (33pounds)/ centralized wire-box;
Please ensure the mounting bracket is properly installed before
hanging
the inverter and wire-box on the bracket.
INSTRUCTION:
Please check with your local electricity sup
ply company before
selecting a
grid standard. If the inverter is operated with a wrong grid
standard, the electri
city supply company may cancel the
interconnection agreement.
Placing
the inverter into operation before the overall system complies
with the national rules and safety regulations is not permitted.

5
Chapter 2 Overview
2.1 Inverter for Grid-tied PV Systems
CPS SCH100KTL-DO/US-600 and CPS SCH100KTL-DO/US-600 3-Phase
String Inverters are designed for use with carport, commercial rooftop, and
large-scale PV grid-tied systems. The system is generally made up of PV
modules, DC power distribution equipment, PV inverter and AC power
distribution equipment (Figure 2-1). The inverter converts the DC from PV
modules to AC with 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 supplied
to the electricity grid.
Figure 2-1 Grid-tied PV system
2.2 Product Features
 High conversion efficiency：Advanced 3-level conversion technology
with SVPWM (Space Vector Pulse Width Modulation); Max. efficiency:
99%；CEC efficiency: 98.5%
 Grid adaptability: IEEE 1547, Rule 21, and HECO standards applicable;
Reactive power adjustable; PF value: ±0.8, Remote Curtailment.
 Flexible communication: Supports standard Modbus RS485 and
TCP/IP communications to ensure compatibility with 3rd party monitoring
and control systems.
 Wide DC input voltage range：Operating DC Input Voltage Range:
860-1450Vdc; Max DC input voltage: 1500V.

6
 Long Service Life: Uses thin-film capacitors to extend inverter's
service life.
 1 MPPT: 1 MPPT with 16 (100kW) and 20 (125kW) inputs in the
standard wire-boxes for maximum flexibility.
 Wire-box option: Standard wire-box enables discrete wiring,
or optional Centralized wire-box for connection of DC combiner boxes.
 High protection degree: 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 20 fused string inputs eliminate the need for external
combiner boxes, simplifying installation.
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 protection 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
 External environmental temperature monitoring
 IGBT power module temperature monitoring

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2.4 Schematic Diagram and Circuit Design
The basic electrical schematic diagram of CPS SCH100KTL-DO/US-600 and
SCH125KTL-DO/US-600 inverters are shown in Figure 2-2.
Figure 2-2 Schematic Diagram of the SCH100/125KTL-DO/US-600 Inverter
The input from PV source circuits passes through surge protection circuitry
and DC EMI wave filter to the bus capacitance. The inverter then converts the
DC voltage to 3-phase AC voltage. Most of the high frequency AC harmonics
are removed with the wave filter. The output AC is connected to the grid via a
two-stage relay and a maintenance switch. There is also a three-phase SPD
at the AC output side.

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2.5 Appearance and Main Item Description
Inverter with Centralized Wire-box Inverter with Standard Wire-box
Figure 2-3 Appearance of the CPS SCH100/125KTL-DO/US-600 Inverters
Main items of the Inverter:
① Main inverter enclosure
② Inverter wire-box
③ LED indicator lights
④ LinKit module
⑤ Cooling fans
⑥ DC switch: DC power on/off
⑦ AC switch: AC power on/off
⑧ DC Input cable entry
⑨ AC output cable entry
⑩ Communication cable entry

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2.6 Anti-islanding Detection
The SCH100KTL-DO/US-600 and SCH125KTL-DO/US-600 inverters include
Anti-Islanding detection as required by UL1741/IEEE1547. The inverter will
continuously make bi-directional perturbations to the frequency of the output
current by injecting a small amount of reactive power in order 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 as part of the DC ground fault
detection method required by UL1741. If there is a ground fault in the PV array,
the ground fault detection circuitry will detect leakage current and trigger an
alarm. The inverter will cease operation if the leakage current exceeds 500mA.
2.8 Surge Suppression
Standard Waveform Peak Values
Surge Category Ring Wave Combination Wave
B 6kV/0.5kA 6kV/3kA
 "Standard 1.2/50μs - 8/20μs Combination Wave"
 "Standard 0.5μs - 100 kHz Ring Wave"
2.9 DC Arc-fault Protection
The Standard wire-box 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.

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Chapter 3 Installation
Below is the installation procedure for the SCH100KTL-DO/US-600 and SCH
125KTL-DO/US-600 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; B) The wire-box, 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 Figure QTY Note Box
(1) Main enclosure of
the PV inverter
1 The PV inverter A
(2) Wire-box of the PV
inverter
1
Wire-box will vary depending on
the model ordered (Standard or
Centralized)
B
(3) Mounting bracket
1
Bracket to mount the PV inverter
(left bracket: inverter, and right
bracket: wire-box) Right bracket
will vary depending on the model
of wire-box ordered.
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

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The Accessory kit (5) contains items listed below:
Table 3-2 Accessory Kit
No. Item QTY Note
(1) M8*Expansion anchors 6 For attaching bracket to concrete wall
(2)
M8×25mm machine bolts with integrated
lock washer
6 Used with M8 expansion anchors
(3) M6 X18mm Phillips screw 5
4 for inverter and mounting bracket; 1 for
Ground connection
(4) M8 hexagon nuts with flange 6
To connect the left and right wall bracket,
and securing the main inverter to the wire-
box
(5) 8 pin PCB connector plug 1 For dry contact output signal (optional)
(6)
M8×20mm machine bolts with integrated
lock washer
4
PV Input busbar wiring (Centralized Wire-
box)
(7) M8 nut with flat gasket and spring washer 4 AC terminal connections
(8) LINKIT communication module 1 LinKIT2NO-LCD replace LCD display
INSTRUCTION:
The items in the Accessory Kit Table 3-2 above are
for the standard
configuration. The accessories provided
may vary if optional parts are
purchased.

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3.1 Recommendations Before Installation
See Chapter 8, Technical Data for specification ranges and limits.
 Check that the product environmental specifications (protection degree,
operating temperature range, humidity and altitude, etc.) meet the
requirements of the specific project location.
 Make sure that the power grid voltage is within range for the grid standard
chosen.
 Ensure that the local electricity supply authority has granted permission to
connect to the grid.
 Installation personnel must be qualified electricians or those who have
received professional training.
 Wear and use proper PPE (personal protective equipment) during
installation.
 Sufficient space according to Figure 3-4 and 3-5 must be provided to allow
the inverter cooling system to operate normally.
 Install the inverter away from flammable and explosive substances.
 Avoid installing the inverter in locations that exceed the temperature limits
specified for the inverter to prevent undesirable power loss.
 Do not install the inverter near an electromagnetic source which can
compromise the normal operation of electronic equipment.

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3.2 Mechanical Installation
(1) Dimensions
100/125kW Standard Wire-box
100/125kW Centralized Wire-box
Figure 3-1 Dimensions of CPS SCH100/125KTL-DO/US-600 Inverter

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(2) Installation Method (see Figure 3-2):
Make sure that the mounting structure (bearing wall, rack, etc.) is suitable
to support the inverter weight. Follow the mounting guidelines below:
(a) If the location permits, install the inverter vertically.
(b) If the inverter cannot be mounted vertically, it may be tilted backward
to 15 degrees from horizontal.
(c) Do not mount the inverter leaning forward.
(d) Do not mount the inverter upside down.
(e) Do not mount the inverter horizontal installation.
Figure 3-2 Inverter Mounting Options
Figure 3-3 Inverter Mounting Suggestion
NOTICE:
If the installation environment allows,
avoiding direct sunlight from the
inverter, avoiding direct rain and snow, can extend the life of t
he
inverter (See Figure 3-3).

15
(3) Installation Space Requirement (see Figure 3-4):
The distances between the inverters or the surrounding objects should
meet the following conditions:
Figure 3-4 Inverter Wall Mounting Dimensions
NOTICE:
The s
pacing between two adjacently mounted inverters should be
≥300mm (11.8
inches). Ensure that the air space around the inverter
is well ventilated.
The installation clearance between two inverters should be increased
when the ambient temperature is higher than 45°C.

16
Figure 3-5 Inverter Pillar Mounting Dimensions