CPS SC Series User manual

CPS SC Series Grid-tied PV Inverter
CPS SC14KTL-DO/US-208
CPS SC20KTL-DO/US-480
Installation and Operation Manual
Version 1.4
CHINT POWER SYSTEMS AMERICA CO., LTD.

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 type description................................................................5
2.3 Product features............................................................................5
2.4 Circuit structure design..................................................................6
2.5 Appearance description.................................................................7
Chapter 3 Installation...............................................................................9
3.1 Basic requirements........................................................................10
3.2 Mechanical installation..................................................................11
3.3 Electrical installation......................................................................19
3.3.1 DC connection............................................................................20
3.3.2 AC and ground connection.........................................................28
3.3.3 Communication connection........................................................31
Chapter 4 Operation.................................................................................34
4.1 Start-up and shut-down.................................................................34
4.1.1 Start-up.......................................................................................34
4.1.2 Shut-down..................................................................................34
4.2 Operation mode.............................................................................34
4.3 Grid connection and power generation..........................................36
4.4 Fault shutdown..............................................................................37
Chapter 5 User Interface..........................................................................46
5.1 Description of LCD panel ..............................................................46
5.2 Operation state..............................................................................48
5.3 Interface and menu functions........................................................48
5.3.1 Interface types............................................................................48
5.3.2 Main operation interface.............................................................50
5.3.3 Operation information.................................................................51
5.3.4 Alarm..........................................................................................52
5.3.5 History........................................................................................52
5.3.6 System setup..............................................................................53
5.3.7 Power Dispatch..........................................................................56
5.3.8 System protection parameters setup..........................................59
Chapter 6 Service and Maintenance.......................................................63
6.1 Disassembling of fan tray assembly..............................................63
6.2 Restoring of fan tray assembly......................................................65
Chapter 7 Technical Data.........................................................................69
Chapter 8 Limited Warranty.....................................................................73

1
Before You Start…
This manual contains important information regarding installation and safe
operation of this unit. Be sure to read this manual carefully before using.
Thanks for choosing this CPS Grid-tied PV Inverter. This PV Inverter is a high
performance and highly reliable product specifically designed for the North
American Solar market.
If you encounter any problems during installation or operation of this unit, first
check this manual before contacting your local dealer or supplier. Instructions
inside this manual will help you solve most installation and operation
difficulties.
Please keep this 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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Markings on the product
HIGH VOLTAGE:
The product 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 grounding terminal, which
must be securely connected to the earth through the PE
(protective earthing) cable to ensure operational safety.
DANGER:
Please disconnect the inverter from AC grid and PV modules before
opening the equipment. When the PV array is exposed to light, it
supplies DC voltage to this equipment. Make sure hazardous high
voltage and energy inside the equipment has been discharged.
Do not operate or maintain the inverter until at least 10 minutes after
disconnecting all sources from DC and AC sides.
WARNING:
All the installation and wiring connections should be performed only
by qualified technical personnel. Disconnect the inverter from PV
modules and the Power Grid before maintaining and operating the
equipment.

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CAUTION:
CPS SC20KTL-DO/US-480 & SC14KTL-DO inverter is approx 63kg
(≈132 pounds).
Please ensure the mounting is properly installed before hanging the
the inverter on the bracket.
CAUTION:
CPS SC20KTL-DO/US-480 & SC14KTL-DO series inverter have the
Arc Fault Detection feature in the disabled mode by default. Please
ensure that this setting meets local code requirements. If you need to
enable this feature for your install then please call our HOTLINE:
855-584-7168, or contact your local sales or service manager for
assistance.
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.
INSTRUCTION:
Conduits shall be used as the cable protectors for wire connection.

5
Chapter 2 Overview
2.1 Inverter for grid-tied PV systems
CPS SC20KTL-DO/US-480 & SC14KTL-DO inverter is suitable for use
with various commercial rooftop systems and distributed power station
systems. Normally, the system mainly consists of PV modules, DC power
distribution equipments, PV inverter and AC power distribution equipments
(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.
DC power
distribution
equipments
AC Grid
Bidirectional
electric meter
AC power
distribution
equipments
Figure 2-1 Grid-tied PV system
2.2 Product type description
CPS SC20KTL-DO/US-480 & SC14KTL-DO is a two-MPPT PV inverter
integrated with the DC and AC switches for indoor and outdoor application.
The suffix “US” means that this model of inverter passes the UL certification
and is specialized for the American market.
2.3 Product features
CPS SC20KTL-DO/US-480 & SC14KTL-DO inverter incorporates the
advanced 3-level and MOSFET paralleled with IGBT technology to minimize
the energy loss. Meanwhile, the arc-fault detection (AFD) function is added to
meet the requirements of UL1699B for DC arc.

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The two-MPPT design has the benefit of increasing the power generating
efficiency of the whole PV system. The inverter has 2 MPPTs, so a separate
array can be controlled by an independent Maximum Power Point Tracking
(MPPT) control circuit. This means that the two arrays can be installed in
different positions and orientations.
The transformerless design of inverter with the benefit of small size, light
weight and high power density, provides the best cost performance for the
whole PV system.
The inverter is available for both indoor and outdoor applications due to its
NEMA 3R (IP65) protection class enclosure.
Integrated AFCI (Arc Fault Circuit Interruption) feature enables the need
to meet advanced local electrical and grid codes. This feature is disabled by
default but can be enabled if needed in the field. Please contact CPS at
HOTLINE: [phone] number to get instructions.
The integrated DC and AC switches make the maintenance more flexible
and safer. Besides, the inverter has the function to support one or two
independent MPPTs input to improve the system efficiency. Meanwhile, the
inverter can automatically identify the connection way between PV modules
due to its excellent self-adaption ability.
2.4 Circuit structure design
The basic schematic diagram of CPS SC20KTL-DO/US-480 &
SC14KTL-DO is shown in Figure 2-2. The input DC passes through surge
protection circuitry, AFD circuit，DC EMI filter, and the boost circuit to achieve
maximum power tracking and boost up voltages. The arc-fault detection (AFD)
is a device that can provide arcing protection for the PV system and wiring
against the unwanted effects of arcing by enabling an interruption or shorting
device to interrupt power delivered to an arcing fault. The inverter converts the
DC energy to 3-phase AC energy. The high frequency components of AC

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voltage are removed with a line filter. Then the 3-phase AC energy is sent
through two-stage relays and EMI filter to produce high qualityAC power.
EMI
Filter
INV
EMI
Filter
L1
L2
L3
N
PE
Filter
Lighting
surge
DC_Switch
PV1+
PV1-
DC/DC
EMI
Filter
PV2+
PV2-
DC/DC
AC_Switch
Lighting
surge
Lighting
surge
AFD
Figure 2-2 Schematic diagram of CPS SC20KTL-DO/US-480 & SC14KTL-DO
2.5 Appearance description
1
2
3
4
8
6
5
7
Figure 2-3 Appearance sketch of CPS SC20KTL-DO/US-480 &
SC14KTL-DO/US-208

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Description of main items of CPS SC20KTL-DO/US-480 &
SC14KTL-DO/US-208 (See Figure 2-3):
1. LCD key buttons: operate the functions and change settings of inverter
2. LCD display: indicates data
3. LED indicator lights: indicate the status of inverter
4. Holes for cable entry
5. DC switch: control the DC power on and off
6. AC switch: control the AC power on and off
7. Main housing
8. Wiring box

9
Chapter 3 Installation
Below is the installation instruction of the inverter. Please read carefully
and install the product step-by-step.
1. CPS SC20KTL-DO/US-480 & SC14KTL-DO/US-208
Check and make sure that the following items are included in the package
before installation, as shown in Table 3-1.
Table 3-1 Main items
No.
Item
Q’ty
Note
(1)
CPS
SC20KTL-DO/US-480
or SC14KTL-DO
Grid-tied PV inverter
1
Grid-tied PV inverter
(2)
Mounting bracket
1
upon which Inverter
is hung and mounted
onto a wall
(3)
Installation and
operation manual
1
Installation and
operation manual
(4)
Accessory kit
1
contains all
necessary
accessories
The (5) Accessory kit contains items listed below:
Table 3-2 Accessories
Item
Q’ty
Purpose
M8x25 Expansion
bolts&nuts
8 pairs
for bracket installation
OT type terminal
1
for ground cable

10
Pre-insulated end ferrule
20
16 for DC input cables, 4
for AC output cables
RJ45 connecters
4
for communication cables
Flange M5 nut
2
for grounding wire (1 nut for
backup use)
Red wire
1
for inverter with 1 MPPT
working alone
Black wire
1
for inverter with 1 MPPT
working alone
3.1 Basic requirements
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 normal range;
Ensure that the local electricity supply authority has granted permission
to connect to the grid;
Ensure that local code requirement is met by enabling the AFCI function
from the LCD screen. This feature is disabled by default but can be
enabled in the field.
Installation personnel must be qualified electricians or people who have
received professional training;
Sufficient space is 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

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limits specified in the inverter data sheet to limit undesirable power loss;
Do not install the inverter near the electromagnetic source which can
compromise the normal operation of electronic equipment;
3.2 Mechanical installation
(1) Dimensions
The dimensions of CPS SC20KTL-DO/US-480 & SC14KTL-DO inverter
are shown in Figure 3-1.
21.42in
41.73in
8.46in
544mm
1060mm
215mm
Figure 3-1 Dimensions of CPS SC20KTL-DO/US-480 & SC14KTL-DO/US-208

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(2) Installation method
Make sure that the mounting structure (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 is allowed to be tilted
backward by Max. 15°.
(c) Do NOT mount the inverter forwards.
(d) Do NOT mount the inverter in a horizontal position.
(e) Do NOT mount the inverter upside down.
Figure 3-2 Mounting the inverter properly

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(3) Space required for inverter mounting on the wall (as shown in Figure
3-3)
The distances between the inverter and the surrounding objects should
meet the following conditions: two sides from the walls ≥11.81 inches; top
distance ≥11.81 inches; bottom distance ≥23.62 inches; the minimum spacing
between two adjacently mounted inverters ≥23.62 inches.
Figure 3-3 Inverter mounting dimensions
NOTICE:
When the inverter is mounted backward by ≤15° outdoor, shield
cover is required to be installed above the inverter to avoid direct
sunlight.

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(3) Secure the bracket with bolts through the mounting holes and install
the inverter:
(a) Mark the 6 bolt holes for mounting the bracket as shown in Figure 3-4;
Figure 3-4 Bracket mounting dimensions
(b) Drill holes at the marked positions with a diameter of 0.4 inch drill

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and put the 6 M8*25 expansion bolts into the holes;
(c) Take the mounting bracket out of the package and secure the
bracket on the wall with the 6 nuts in pair as shown in Figure 3-5;
Figure 3-5 Positions of bolt holes on the bracket
(d) Screw off the bolts and remove the two panels on both sides of the
inverter as shown in Figure 3-6;

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Figure 3-6 Removal of panels before mounting inverter
(e) Two people grab at the position on each side, lift up the inverter
and then hang it on the bracket (Figure 3-7a~e). Make sure the
inverter is securely hooked on the bracket;
Hand Grab