CPS SCH Series User manual

CPS SCH Series Grid-tied PV Inverter
SCH125KTL-AIO/US-600
Installation and Operation Manual - Rev 1.2
CHINT POWER SYSTEMS AMERICA CO.
REVISON 1.2 SEPTEMBER 2020

Revision History
Rev
Number
Chap/Sec
Rev Date
Description
1.0
NA
Mar 2020
Initial Release
1.1
sdb
05/27/2020
Clean-up
1.2
sdb
08/15/2020
Clarification of LCD-LESS Set-up

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 ............................................14
3.2 Mechanical Installation ..................................................................15
3.3 Electrical Installation......................................................................25
Chapter 4 Commissioning (Via Wireless ) ............................................. 40
4.1 APP Download ...............................................................................40
4.2 Commissioning Checklist ..............................................................40
4.4 Connection to the inverter – Wireless.............................................41
Chapter 5 APP Interface .......................................................................... 46
5.1 Overview........................................................................................46
5.2 Main section...................................................................................47
5.3 Running Data .................................................................................48
5.4 Settings...........................................................................................49
5.5 History............................................................................................77
Chapter 6 Fault Shutdown and Troubleshooting .................................. 79
6.1 LED Fault and Troubleshooting .....................................................79
6.2 Fault and Troubleshooting..............................................................81
Chapter 7 Product Maintenance ............................................................. 89
7.1 GENERAL MAINTENANCE .......................................................89
Chapter 8 Technical Data ........................................................................ 94
Chapter 9 Limited Warranty .................................................................... 99

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
SCH125KTL-AIO/US-600 Utility Grid-tied PV Inverter. 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 SCH125KTL-AIO/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.
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 SCH125KTL-AIO/US-600 inverter 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
CPS SCH125KTL-AIO/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.
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;
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
◆Anti-islanding – activated
◆Low/High Voltage Ride-Though – activated
◆Low/High Frequency Ride-Though – activated
◆Dynamic Volt/VAR operations – activated
◆Ramp rates – activated
◆Fixed power factor – deactivated
◆Reconnect by “soft-start” methods – activated
◆Frequency-Watt (Optional) – activated
◆Volt/Watt (Optional) – deactivated. Activated under mutual agreement
with Distribution Provide instructions

8
2.5 Schematic Diagram and Circuit Design
The basic electrical schematic diagram of CPS SCH125KTL-AIO/US-600
inverters are shown in Figure 2-2.
INV
L1
L2
L3
N
PV1+
PV2+
PV3+
PV4+
DC
Switch
BUS+ AC
Output
PV Input 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
DC EMI
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
1
2
5
3
11.2in(283.5mm)
42.7in(1085mm)
24.3in(616mm)
4
8
7
69
Figure 2-3 Appearance of the CPS SCH125KTL-AIO/US-600 Inverters
Main items of the Inverter:
1) Main inverter enclosure
2) LED indicator lights
3) Communication module
4) Cooling fans
5) DC switch: DC power on/off
6) DC Input cable hole
7) AC output cable hole
8) Communication cable hole
9) Vent

10
2.7 Anti-islanding Detection
The CPS SCH125KTL-AIO/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.
2.8 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 trigger value.
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 SCH125KTL-AIO/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 mounting bracket, user manual
and accessory kit. Before installation, please check that the following items are
included in the packages:

12
Table 3-1 Main Items
No.
Item
Figure
Q
TY
Note
Box
(1)
Main
enclosure of
the PV
inverter
1
Inverter
A
(2)
Mounting
bracket
1
Bracket upon which
the PV inverter is hung
and mounted
B
(4)
User manual
1
Quick installation
manual
B
(5)
Accessory kit
1
Kit contains all
necessary hardware
and accessories for
installation
B

13
The (5) Accessory kit 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 12V power supply
C
M8×25mm machine bolts with
integrated lock washer
5
For attaching bracket to concrete wall
D
M6 X18mm Phillips screw
3
2 for inverter and mounting bracket;
1 for spare
E
M10 nut with flat gasket and
spring washer
3
For AC terminal block
F
M10 big flat gasket
3
For AC terminal (customized for big-
hole lug)
G
Wi-Fi Communication Module
1
Connect and commission though CPS
Connect Application
I
Hex socket screw
1
Spare (for wiring box cover)
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.

14
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.
✓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.

15
3.2 Mechanical Installation
1) Dimensions
42.7in(1085mm)
24.3in(616mm)
11.2in(283.5mm)
23.4in(594mm) 19.3in(489.5mm)
Figure 3-1 Dimensions of CPS SCH125KTL-AIO/US-600 Inverter
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 by
no lower than 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.

16
(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.