Chint Power CPS SCH Series User manual

CPS SCH Series Grid-tied PV Inverter
SCH100KTL-DO/US-600, SCH125KTL-DO/US-600
and
SCH100KTL-DO/US-480
Installation and Operation Manual Rev 1.8
CHINT POWER SYSTEMS AMERICA CO.
REVISON 1.8 AUGUST 2021

Table of Contents
Before You Start… ..................................................................................1
Chapter 1 IMPORTANT SAFETY INSTRUCTIONS ................................2
Chapter 2 Overview ................................................................................6
2.1 Inverter for Grid-tied PV Systems ..................................................6
2.2 Product Features .............................................................................6
2.3 Product Protection Functions..........................................................7
2.4 Smart Inverter Functions ................................................................7
2.5 Schematic Diagram and Circuit Design..........................................8
2.6 Appearance and Main Item Description..........................................9
2.7 Anti-islanding Detection.................................................................10
2.8 DC Ground Fault Protection ...........................................................10
2.9 Surge Suppression ..........................................................................10
Chapter 3 Installation .............................................................................11
3.1 Recommendations Before Installation............................................13
3.2 Mechanical Installation...................................................................14
3.3 Electrical Installation......................................................................29
Chapter 4 Commissioning (Via Wireless ) ............................................52
4.1 APP Download................................................................................52
4.2 Commissioning Checklist...............................................................52
4.3 Commissioning Steps .....................................................................53
4.4 Connection to the inverter – Wireless.............................................53
Chapter 5 APP Interface .........................................................................58
5.1 Overview ........................................................................................58
5.2 Main section ...................................................................................59
5.3 Running Data..................................................................................60
5.4 Settings ...........................................................................................61
5.5 History ............................................................................................84
Chapter 6 Fault Shutdown and Troubleshooting .................................86
6.1 LED Fault and Troubleshooting .....................................................86
6.2 Fault and Troubleshooting ..............................................................88
Chapter 7 Product Maintenance ............................................................96
7.1 General Maintenance......................................................................96
Chapter 8 Technical Data .......................................................................102
Chapter 9 Limited Warranty ...................................................................107

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, CPS SCH125KTL-DO/US-600 and SCH100KTL-
DO/US-480 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, CPS SCH125KTL-DO/US-600 and CPS
SCH100KTL-DO/US-480
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.
Failure to follow these instructions and other relevant safety procedures
may result in voiding of the 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 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.

3
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 grounding terminal, which
must be securely connected to the earth through the PE
(protective earthling) cable to ensure operational safety.
WARNING:
All the 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 only with same type
and ratings of fuse.

4
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.
CAUTION:
CPS SCH100KTL/US-600, CPS SCH125KTL/US-600 and CPS
SCH100KTL/US-480 inverters are approx. 72kg (158 lbs).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 supply company before
selecting a grid standard. If the inverter is operated with a wrong grid
standard, the electricity supply company may cancel the
interconnection agreement.
Placing the inverter into operation before the overall system complies
with the national rules and safety regulations of the application is not
permitted.

5
If there is a fault and it is safe to access the inverter:
1. Read/record the fault code(s) displayed on the APP interface.
2. Turn OFF the inverter via the APP 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 APP interface:
a. If the MPPT current is <125A 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 6-2. Make sure appropriate safety
precautions and PPE are used.
6. If it is not possible to read the DC MPPT currents through the APP 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 fuse are open, measure the total MPPT current. If it
is <125A, 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 6-2.
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.

6
Chapter 2 Overview
2.1 Inverter for Grid-tied PV Systems
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.
Bidirectional
electric meter
AC power
distribution
equipment
Figure 2-1 Grid-tied PV system
2.2 Product Features
◆High conversion efficiency ：Advanced 3-level conversion technology with
SVPWM; Max. efficiency: 99%；CEC efficiency: 98.5%
◆Grid adaptability: IEEE 1547, Rule 21, ISO-NE and HECO standards applicable
(Future); 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
for CPS SCH100KTL-DO/US-600 and CPS SCH125KTL-DO/US-600 inverters;
750-1450Vdc for CPS SCH100KTL-DO/US-480 inverters; Max DC input voltage:
1500V
◆Long Service Life: Uses thin-film and electrolytic capacitors to extend inverter's
service life.
◆High protection degree: NEMA 4X enclosure meets the demanding needs of both
indoor and outdoor use.
◆Intelligent Integration: Integrated load break rated DC disconnect switches, and
up to 20 fused string inputs eliminate the need for external combiner boxes,
simplifying installation.

7
2.3 Product Protection Functions
✓Reverse polarity protection of DC input
✓AC and DC Short circuit protection
✓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
2.4 Smart Inverter Functions and default Activation
Function
IEEE1547-2014
Rule 21
ISO-NE
Anti-islanding
Enabled
Enabled
Enabled
Low/High Voltage Ride-Though
N/A
Enabled
Disabled
Low/High Frequency Ride-
Though
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

8
2.5 Schematic Diagram and Circuit Design
The basic electrical schematic diagram of CPS SCH100KTL-DO/US-600,
CPS SCH125KTL-DO/US-600 and CPS SCH100KTL-DO/US-480 inverters
are shown in Figure 2-2.
INV
L1
L2
L3
N
PV1+
PV2+
PV3+
PV4+
DC
Switch
BUS+ AC
Output
PV Input
AFD
Fuse
DC SPD
BUS
AC
EMI
LCL Filter
Relay
PV5+
PV6+
PV7+
PV8+
PV9+
PV10+
PV11+
PV12+
PV13+
PV14+
PV15+
PV16+
PV17+
PV18+
PV19+
PV20+
BUS-
PV1-
PV2-
PV3-
PV4-
PV5-
PV6-
PV7-
PV8-
PV9-
PV10-
PV11-
PV12-
PV13-
PV14-
PV15-
PV16-
PV17-
PV18-
PV19-
PV20-
AC SPD
AC
Switch
DC EMI
SCH125KTL Only
Figure 2-2 Schematic Diagram of the 100/125kW Inverter
The input from PV source circuits passes through surge protection circuitry,
DC EMI wave filter, to bus capacitance. The inverter then converts the DC
voltage to 3-phase AC voltage. Most of the high frequency AC harmonics are
removed with a wave filter. The output AC is connected to the grid via two-stage
relay. There is also a three-phase SPD at the AC output side.

9
2.6 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 and SCH 100KTL-
DO/US-480 Inverters
Main items of the Inverter:
①Main inverter enclosure
②Inverter wire-box
③LED indicator lights
④WiFi module
⑤Cooling fans
⑥DC switch: DC power on/off
⑦AC switch: AC power on/off
⑧DC Input cable entry
⑨AC output cable entry
⑩Communication cable entry

10
2.7 Anti-islanding Detection
The SCH100KTL-DO/US-600, SCH125KTL-DO/US-600 and SCH100KTL-
DO/US-480 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.
2.8 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.
2.9 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"

11
Chapter 3 Installation
Below is the installation procedure for the SCH100KTL-DO/US-600, SCH
125KTL-DO/US-600 and SCH100KTL-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; 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
Standard wire-box
Centralized wire-box
1
Wire-box will vary depending on
the model ordered (Standard
wire-box with integrated DC fuse
inputs or Centralized wire-box
without DC fusing to be used with
external DC combiner)
B
(4)
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
(5)
Accessory kit
1
Kit contains all necessary
hardware and accessories for
installation
B

12
The Accessory kit (5) contains items listed below:
Table 3-2 Accessory Kit
No.
Item
QTY
Note
(A)
6-pin PCB connector plug
1
For RS485 communication
(B)
2-pin PCB connector plug
1
For power supply
(C)
M8x25mm machine bolts with integrated
lock washer
6
For mounting backet installation
(D)
M6x18mm Phillips screw
4
4 for inverter and mounting bracket; 1 for
Ground connection
(E)
M8 hexagon nuts with flange
7
To connect the left and right wall bracket,
and securing the main inverter to the wire-
box, 1 spare
(F)
M10 nut with flat gasket and spring
washer
3
For AC terminal connections
(G)
WiFi communication module
1
Enables mobile app interface via CPS
Connect Pro app
(H)
Philips screw
1
Spare (for wire-box cover)
(I)
User Manual
1
PV inverter installation and operation
manual
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.

13
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. This
includes unmaintained grass.
✓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.
✓The PV Array is not grounded.
✓The conduits entries meet the following:
✓ALL Conduit Entries must use water-tight fittings.
✓ALL Conduit Entries should use sealant around wires inside wire-
box to prevent moisture ingress.
✓ALL Conduit Fittings should be metal to contain any thermal event
in the wire-box – cause by moisture ingress.

14
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 and
CPS SCH100KTL-DO/US-480 Inverter

15
(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.
(e)
(c)
VERTICAL
15°
(b)
(a) (d)
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 the inverter
(See Figure 3-3). Direct sun install does not impact warranty.

16
(3) Installation Space Requirement (see Figure 3-4a, b, and c):
The distances between the inverters or the surrounding objects should meet
the following conditions:
(A) Minimum Height from the ground (12 Inches minimum):
a. MUST Prevent Water damage in flood prone areas.
b. SHOULD Allow for ease of fan replacement
c. MUST meet NEC 6’ – 7” maximum height to disconnect.
(B) Minimum height between air intake or air exhaust. 6-inches is the smallest
allowable distance.
a. The distance MUST be great enough to allow low impedance to
air flow.
b. The distance SHOULD allow easy fan replacement access.
(C) The NEC specifies the maximum allowable height for a disconnect MUST
be 6’ - 7” Maximum.
(D) The distance between side by side inverters SHOULD be greater than 18”.
a. This dimension depends on if the inverters are stacked and
staggered (Figure 3-4a) or not. The stacked and staggered
configuration does not require a baffle since the exhaust of the
lower unit is directed between the inverters above.
(E) The distance between side by side inverters SHOULD be greater than 12”
–except in case (D) above.
(F) (F1) This dimension will be determined primarily by the structural strength
required to support the inverters. There MUST be a vertical chimney for
the exhaust air of at least 50 square inches directly above and per inverter.
(F2) The clearance above the inverter chimney MUST be greater than 6”
per stacked inverter. The front and rear of this dimension MUST be open
to allow horizontal air-flow.
(G) (G1) In the case of a wire-way installed between the stacked inverter, the
clearances MUST meet (B) and (C) above. For a 10” wire-way this would
be 22” minimum. (G2) If no wire-way is installed, the minimum clearance
MUST be greater than 18”.
(H) In the staggered configurations, the vertical alignment MUST be as shown.
If inverters are stacked and meet (C), Baffles must be installed unless the
inverters are staggered per Figure 3-4a. This configuration also allows ease
of conduit routing without a wire-way.