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CPS SCA Series Installation And Operation Manual

Grid-tied pv inverter
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CPS SCA Series Grid-tied PV Inverter
SCA25KTL-DO-R/US-480
Installation and Operation Manual - Rev 2.0
CHINT POWER SYSTEMS AMERICA CO.
Revision 2.0 - Mar 2020

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  • Page 1 CPS SCA Series Grid-tied PV Inverter SCA25KTL-DO-R/US-480 Installation and Operation Manual - Rev 2.0 CHINT POWER SYSTEMS AMERICA CO. Revision 2.0 - Mar 2020...
  • Page 3 Revision History Rev Number Chap/Sec Rev Date Description Mar 2020 Initial Release...

  • Page 4: Table Of Contents

    Table of Contents BEFORE YOU START… ............... 1 1. IMPORTANT SAFETY INSTRUCTIONS ........3 2. OVERVIEW ..................8 2.1 I ............8 NVERTER FOR GRID TIED SYSTEMS 2.2 P ................8 RODUCT EATURES 2.3 P ............9 RODUCT ROTECTION UNCTIONS 2.4 A ..........
  • Page 5 3.4.1 DC Connection ..............29 3.4.2 AC and Ground Connection ..........36 3.5 C ............. 41 OMMUNICATION ONNECTION 3.5.1 Description of the Communication Board ......42 3.5.2 RS485 Communication ............43 3.5.3 RS485 Network Set-up ............44 3.5.4 Communication Wiring ............45 4.
  • Page 6 5.4.8 ReactivePowerDerating ............81 5.4.9 Others ..................87 5.5 F ................90 AULT ECORDING 5.6 H .................... 90 ISTORY 5.7 T ON/OFF ..................91 6. FAULT SHUTDOWN AND TROUBLESHOOTING ...... 93 6.1 LED F ............93 AULT AND ROUBLESHOOTING 6.2 F ..............
  • Page 7 9.3.2 Altitude Derating Graph ............115 9.3.3 Grid Voltage Derating Graph ........... 115 LIMITED WARRANTY ............117...

  • Page 9: 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 SCA25KTL-DO-R/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.
  • Page 10 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.

  • Page 11: Important Safety Instructions

    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.
  • Page 12 Markings on the product CAUTION: Risk of electric shock from energy stored in capacitor. Do not remove cover until 5 minutes after disconnecting all sources of supply. CAUTION: Risk of electric shock, do not remove cover. No user serviceable parts inside. Refer servicing to qualified service personnel.
  • Page 13 CAUTION: Hot surfaces. To reduce the risk of burns, do not touch. WARNING: For continued protection against risk of fire, replace only with same type and ratings of fuse. WARNING: HAZARDOUS VOLTAGE AREA UNDER THE PLASTIC COVER. DO NOT OPEN FUSE HOLDERS UNDER LOAD! PROTECTIVE GEAR MUST BE USED/WORN BEFORE ACCESSING FUSES! WARNING:...
  • Page 14 The inverters are designed for PV grid-tied systems. The inverters are to be installed with floating or ungrounded PV arrays only. CAUTION: CPS SCA25KTL-DO-R/US-480 inverters weigh approximately 22kg (48.5 pounds). The wire-box portion weighs approximately 6kg (13.2 pounds). Ensure the mounting bracket is properly installed before hanging the inverter and wire-box on the bracket.
  • Page 15 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.

  • Page 16: Overview

    2. Overview 2.1 Inverter for grid-tied PV systems CPS SCA25KTL-DO-R/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).

  • Page 17: Product Protection Functions

    ▪ Flexible communication: Supports standard CPS Modbus RS485, SunSpec Modbus, and HTTPS/XML communications via Flex Gateway to ensure compatibility with 3 party monitoring and control systems. The Flex Gateway card enables further command/control as well as remote firmware upgrades. (Flex Gateway card is an optional accessory. Refer to Flex Gateway manual for further detailed information.)

  • Page 18: Appearance And Main Item Description

    ✓ DC input insulation to ground monitoring ✓ DC injection of AC output ✓ AC output voltage and frequency monitoring ✓ Leakage current to ground monitoring ✓ Internal enclosure temperature monitoring ✓ IGBT power module temperature monitoring ✓ RSD function Appearance and Main Item Description Figure 2-2 Diagram of the Inverter assembly Main items of the Inverter:...

  • Page 19: Schematic Diagram And Circuit Design

    PV2- PV Input WIRE BOX Figure 2-3 Schematic Diagram of the CPS SCA25KTL-DO-R/US-480 Inverter 2.6 Anti-islanding Detection The CPS SCA25KTL-DO-R/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...

  • Page 20: Dc Ground Fault Protection

    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.

  • Page 21: Installation

    3. Installation This chapter describes the planning and installation procedures for the SCA 25KTL-DO-R/US-480 inverters. Please read carefully and install the products following the step-by-step instructions. Before installation, please check that the following items are included in the packages: Table 3-1 Main Items Q’ty Item Note...

  • Page 22: Recommendations Before Installation

    6 pin PCB connector For the RS485 communication plug 2 pin PCB connector For the RS485 communication plug Philips screw Spare (for wire-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.
  • Page 23 NOTICE: allowable ambient temperature range SCA25KTL-DO-R/US-480 inverters is defined based on the following conditions: Condition 1: -40°C to 70°C, Inverter not installed, and in storage (in packaging or unpackaged). Condition 2: -30°C to 60°C, Inverter installed, connected to electric utility grid and operating during daylight hours. Condition 3: No low temp limit to 70°C, Inverter installed, connected to electric utility grid but non-operating (daylight or nighttime hours).
  • Page 24 DC and AC power connected to the inverters under normal operation. The CPS inverter enclosures are designed to conform to NEMA4X (or IP65), however there exists the possibility of water condensation inside the inverter enclosure when it is left exposed to an outdoor environment without power to operate for an extended period of time.

  • Page 25: Mechanical Installation

    3.2 Mechanical Installation 3.2.1 Dimensions Figure 3-1 Dimensions of the Inverter 3.2.2 Installation Method (see Figure 3-2) Ensure that the mounting structure (wall, rack, roof, etc.) is suitable to support the weight of the inverter. Follow the mounting guidelines below: If the location permits, install the inverter vertically.
  • Page 26 When tilted backward at ≤75º from horizontal in an outdoor environment, the CPS Shade Cover (SSC-25ST-2) accessory is required to be installed. See Section 8.2 for more information. Do not mount the inverter leaning forward. Do not mount the inverter upside down.

  • Page 27: Installation Space Requirement

    The distances between the inverters or the surrounding objects should meet the following conditions: NOTICE: When inverter is installed under direct sunlight, the CPS Shade Cover (SSC-25ST-2) accessory is required to be installed. See Section 8.2 for more information. NOTICE: The spacing between two adjacently mounted inverters must be ≥11.8in (300mm).

  • Page 28: Mounting The Inverter Onto The Bracket

    3.2.4 Mounting the Inverter onto the Bracket ≥ 355mm 290mm 55mm(2.2in.) (14in.) (11.4in.) 8-? 10.0 ≥ 700mm(min.) (27.6in) Note:This dimension can be modified according to installation requirements. Figure 3-4 Dimensions of the bracket anchoring holes for mounting Secure the mounting bracket firmly with a screw fastener. (screws are not supplied by manufacturer and the holes of the mounting bracket are Ф10mm).
  • Page 29 Hang the inverter onto the mounting bracket as shown in Figure 3-6; Manual mounting: One person can safely lift the inverter and mount it onto the bracket. CAUTION: The main enclosure of the CPS SCA25KTL-DO-R/US-480 inverters is 22kg (48.5 pounds). Figure 3-6 Mount the Main Enclosure on the Bracket...
  • Page 30 2. Install the wire-box: Remove screws securing the bulkhead cover at the top of the wire-box. Figure 3-7 Wire-box Bulkhead Cover Save the bulkhead cover and screws and attach the cover to the left side of the wire-box after the wire-box is attached to the inverter enclosure. Covers may be required in the future if an inverter or wire-box is to be removed during servicing (see step 5, Figure 3-10).
  • Page 31 WARNING: Ensure the M6x18 screws (4pcs) installed in Step 3 above are properly torqued and the area under the bolt-head is clear of paint. This connection provides an electrical ground bond of the wire-box to the upper/main enclosure. Figure 3-8 Installation of the Wire-box 4.
  • Page 32 Figure 3-9 Secure the Main Enclosure and Wire-box to the Bracket 5. Attach the bulkhead cover shown in Figure 3-7 to the left side of the wire-box. (see Figure 3-10) Tool required: No.2 Phillips head screwdriver, torque value of 1.6N.m (14.2in-lbs) Remark: the covers shown below do not have waterproof function.
  • Page 33 6. Optional - Install an anti-theft padlock when the installation is complete. The anti-theft padlock is used to prevent the inverter from being stolen when the equipment is installed outdoors. The inverter may be locked to the bracket, as shown in Figure 3-11: Figure 3-11 Location of the Anti-Theft Padlock The anti-theft padlock shackle should meet the requirements of the dimensions shown in Figure 3-12:...

  • Page 34: Electrical Installation

    3.3 Electrical Installation NOTICE: The inverters must be installed in accordance with the National Electric Code, NFPA 70, and any local codes or jurisdictions. A PV array sizing tool is available for download at http://www.chintpowersytems.com accessed by selecting the Product Downloads link to get to String Sizing tool.
  • Page 35 1. Use a No. 3 Philips head screwdriver to remove the 4 screws on the wire-box and remove the cover. (See Figure 3-14) Figure 3-14 Removing the Wire-box Cover To reinstall the cover, replace cover and align the screws. Use a No. 3 Philips head screwdriver to secure the 4 screws on the cover.

  • Page 36: Wire-Box

    3.4 Wire-box 13.1in(333.0mm) 3.3in(85.0mm) 12.1in(308.0mm) 2.4in(60.0mm) 11.1in(283.0mm) 1.4in (35.0mm) 4.4in (111.0mm) DC INPUT COMM. PORT LINKIT AC OUTPUT  For more details please see the user manual. WARNING: High touch current . VENT Earth connection essential before connecting supply. 3 2 3 3 2 3 Figure 3-15 Conduit Knock-out Locations on the wire-box ①...

  • Page 37: Dc Connection

    Figure 3-16 Internal Connection Points within the wire-box ⑦ DC Input fuse holder/terminal (positive) ⑧ DC Input terminal (negative) ⑨ Communication board ⑩ Internal ground terminal ⑪ RSD transmitter ⑫ AC output terminal block 3.4.1 DC Connection 3.4.1.1 Working mode These inverters are factory configured with two MPPTs which are electrically divided into separate PV input zones: PV Input-1 and PV Input-2.
  • Page 38 sites with partial shading of the array or with arrays consisting of different tilt or azimuth. Each MPPT employs a method known as P&O (perturb and observe) for seeking and tracking the maximum power point along the I/V curve of the PV array. During operation, each MPPT will make small adjustments to the PV voltage and then executes a power measurement;...
  • Page 39 3.4.1.2 DC Fuse Configuration/Selection The CPS SCA25KTL-DO-R/US-480 inverter wire-boxes include touch safe fuse holders and 15A DC fuses as a factory standard on the positive side. Ensure that the appropriate fuse values are used depending on the configuration of the PV...
  • Page 40 15A or 20A rated fuses. The larger rated fuses may be required for combined input strings; for example, when Y branch connectors are used with DC field wiring to reduce PV source circuit home runs. CPS allows replacement of the factory installed 15A fuses with appropriate ampere ratings, however CPS...
  • Page 41 (see Section 8.3 for details). Use of different fuses or incorrectly sized fuses can cause damage to equipment or create unsafe working conditions. Any damage resulting from incompatible fuses is not covered by the CPS warranty. NOTICE: Note 1: The temperature rating of the PV Source circuit conductors should be no less than 90°C (194°F).
  • Page 42 "birdcaging" of the conductor during installation and improve the integrity of the termination. Use of the wire ferrules is not mandatory and shall not void the product warranty if not used. (The ferrules are not provided by CPS)
  • Page 43 Table 3-7. Continue terminating the remaining strings in this manner for each MPPT (PVIn1 and PVIn2). 3. Terminate at busbar. The CPS SCA25KTL-DO-R/US-480 wire-box only contains fuseholders for the positive DC conductors. Follow instructions in step 2 for the positive conductors.

  • Page 44: Ac And Ground Connection

    2. The transformer VA rating must be at least 100% of the sum of the connected inverter VA ratings. 3. CPS recommends the transformer VA rating be selected based on IEEE C57.159-2016 Guide on Transformers for application in Distributed Photovoltaic (DPV) Power Generation Systems. It is the responsibility of the system designer to determine and take in account the reliability of the transformer or other system parameters.
  • Page 45 4. The transformer does not require a static shield. 5. The maximum number of inverters connected to a single transformer is 70. 6. The recommended maximum voltage-drop on the Inverter to Point of Common Coupling (to the grid) is 2% at full load – including conductor temperature considerations.
  • Page 46 3.4.2.2 Grounding/Bonding. The inverter provides 1 grounding connection on the AC side and one bonding location. These configurations are illustrated below (Figure 3-21). A. Grounding via the ground busbar (left) [1]. This is required for grounding the equipment by running the EGC with the ungrounded conductors. B.
  • Page 47 Table 3-7 Torque and Conductor Specifications Connection Point Conductor Range Torque Value DC Fuse Holder (pos) 14-8 AWG (CU) 3.0 N-m (26.55 in-lbs) DC Busbar (neg) 14-8 AWG (CU) 3.0 N-m (26.55 in-lbs) 8-2 AWG (90℃ Cu) AC output 14 N-m (120 in-lbs) 6-2 AWG (90℃...
  • Page 48 Figure 3-22 AC output and internal ground conductor set up When bonding the inverter/mount to a metallic structure is required, use the OT type terminal to connect the ground conductor to the external bonding point at the bottom of the wire-box. The bonding point is located at the bottom of the wire-box as shown in Figure 3-23.

  • Page 49: Communication Connection

    Selecting a breaker of another size may either result in nuisance tripping or rejection from the AHJ. Table 3-8 Specification of AC breaker selection Inverter Min AC OCPD Max AC OCPD CPS SCA25KTL-DO-R/US-480 3.5 Communication Connection CPS SCA25KTL-DO-R/US-480 inverters support industry standard Modbus RS485 communication.

  • Page 50: Description Of The Communication Board

    Figure 3-24 Communication Board of wire-box 3.5.1 Description of the Communication Board ① RS485 (Reserved) ② Power port (2pin connector) +12V ③ RS485 port (6pin connector) 485_A 485_B 485_GND 485_A 485_B 485_GND ④ Selector Switch (S201): 120Ω terminal resistor switch for communications.

  • Page 51: Rs485 Communication

    3.5.2 RS485 Communication CPS recommends the following cable for inverter RS485 communications: UTP CAT-5e or (3) 18-22AWG communication cables. It is recommended that industrial grade shielded RS485 cable be used in lieu of unshielded twisted pair. Communication cable such as (CAT5) or Belden 3106A cable for RS485 6-pin connector is preferred.

  • Page 52: Rs485 Network Set-Up

    3.5.3 RS485 Network Set-up When the inverters are monitored via the RS485 communication, a unique RS485 address for each inverter can be set up through the APP interface. Up to 32 inverters can be connected in the RS485 communication network. The daisy-chain topology is recommended for the RS485 network connection to minimize noise and bus reflections, as shown in Figure 3-27.

  • Page 53: Communication Wiring

    If there are multiple inverters in the RS485 network, the selector switch S201 of the last inverter in the daisy-chain should be in ON position, to have the 120Ω terminal resistor enabled. The selector switch S201 of all other inverters should be in the OFF position to disable the terminal resistor.

  • Page 54: Commissioning (Via Wireless App)

    The inverter via mobile phone APP for human-computer interaction, and users can download iOS version at Apple store or Android version in Google store named “CPS Connect” (Support Android 4.1 and IOS 9.0 or later). 4.2 Commissioning Checklist 4.2.1 Mechanical Installation •...

  • Page 55: Electrical Check

    Access Point from the user devices (tablet, smartphone, etc.). 1.) Make sure the WiFi Module is plugged into the inverter 2.) Open the CPS Connect APP 3.) Enable the wireless connection on the device which is being used for the...
  • Page 56 Please input the password “Password” then set the grid “GridStandard, PV Link Type, Neutral Line, RS485, Inverter Clock, Change Password” as shown in Figure 4-1.
  • Page 57 Figure 4-1 System setting GridStandard: Select a grid standard. INSTRUCTION: Please check with your local electricity supply company before selecting a grid standard. If the inverter is operated with a wrong grid standard, electricity supply company cancel 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.
  • Page 58 PV Link Type: The working mode of the DC input connection and MPP Tracker can only be configured for Independent. Neutral Line Setting: Enter whether a neutral line is installed or not. RS485: Enter the communication data Modbus Address and Baud Rate. Inverter Clock: Set the system clock.
  • Page 59 If the inverter fails to operate normally, the “FAULT” light will illuminate and the fault information will show on the Device screen and you can skip to History check the detail as shown in the Figure4-3. Figure 4-3 Fault Information Interface...

  • Page 60: App Interface

    5. APP Interface 5.1 Overview Choose APP function Setup the product Activate a site Manage my site Wifi Setting Main menu Running Data Settings History Turn ON/OFF Month Year Password: 1111 Alarm Running Status Inverter Parameters Read/Write Register Upgrade Firmware Change GridStandard PV Link Type Neutral Line RS485...

  • Page 62: Running Data

    5.3 Running Data In the Running Data sub-menu you can view the Power generation with Day, Month, Year as Following:...

  • Page 63: Settings

    5.4 Settings To access the Settings menu input the password“1111”. The Settings section allows access the following sub-menus: ⚫ Inverter Parameters ⚫ Read/Write Register ⚫ Upgrade Firmware...

  • Page 64: Inverter Parameters

    5.4.1 Inverter Parameters In the Inverter Parameters section it’s possible to access the following sub-menus: GridStandard, PV Link Type, Neutral Line, RS 485, Inverter Clock and Change Password as following Figure:...

  • Page 65: Read/Write Register

    5.4.2 Read/Write Register In the Read/Write Register section it’s possible to access the following sub-menus: ⚫ Commands ⚫ Enable/Disable ⚫ Protect ⚫ LVRT/HVRT ⚫ ActivePowerDerating ⚫ ReactivePowerDerating ⚫ Others...

  • Page 66: Commands

    5.4.3 Commands In the Read/Write Register section it’s possible to access the following sub-menus: • “Power On/Off” menu: Manual Turn ON/OFF: Manual Power ON/OFF is required after regulation setting or manual (fault) shut-down. • “ ForceRestart ” menu: If a fault shutdown happens, a severe fault may have occurred inside the inverter.
  • Page 67 • “ARCDetect” menu: Execute the “ARC Detect”, the inverter will stop operating and test ARC. Arcing check and protection is mainly divided into two parts, the Arcing check board is responsible for whether there is Arcing in line, and transfer Arcing protection signal to the DSP in the dominating control board.

  • Page 68: Enable/Disable

    5.4.4 Enable/Disable Enable/Disable is used for enable or disable the function and protect parameters as following:...
  • Page 69 Table 5-1 The Enable/Disable Parameters (IEEE1547-2018 and Rule21) Enable/Disable Setup range Setup range (lower limit, (lower limit, Parameter name Description default & upper default & upper limit) IEEE1547 limit) Rule-21 The enabled control parameters group. 0:Article 5 groups, control parameter setting of CtrParaGroup inverter loop {0, 4, 4}...
  • Page 70 parameter setting of inverter loop 3:Article 3 groups, control parameter setting of inverter loop 4:Article 4 groups, control parameter setting of inverter loop The control mode of reactive power 0: Disable dispatch mode. 1: Remote dispatch mode. 2: Local control ,by Q {Disable, Disable, {Disable, Q(u), 3: Local control ,by PF...
  • Page 71 enable/disable control Enable} Enable} 0: Disable 1: Enable (Association register address=0x2519) Arc detection enable/disable control 0: Disable {Disable, Enable, {Disable, Enable, ARCEnable 1: Enable Enable} Enable} (Association register address=0x2300~0x230D) Island enable/disable {Disable,Enable, control {Disable,Enable, Enable} Island Protect 0: Disable Enable} 1: Enable {Disable, Enable {Disable, Enable...
  • Page 72 output power output , power output , Enable active Enable active power output } power output } Disable or Enable the soft {Disable, Enable, {Disable, Enable, NormSoftStopPEn stop function Enable} Enable} Disable or Enable the grid protect function and {Disable,Enable, {Disable,Enable, Gridxx1,2ProEn please refer to 5.4.2.3...
  • Page 73 1: Enable GFCI dynamic detection enable/disable control {Disable,Enable, {Disable,Enable, GFCIDynProEn 0: Disable Enable} Enable} 1: Enable Over frequency derating enable/disable control 0: Disable 1~5: Enabling corresponding function {Disable,Disable, {Disable,Disable, OvrFrqDeratingMode 1：Enable Enable} Enable} 2：Reserver 3：Reserver 4：Reserver 5：Reserver DCI protection1 enable/disable control {Disable,Enable, {Disable,Enable, DCIProtection1En...

  • Page 74: Protect

    Grid voltage derating enable/disable control {Disable,Disable, {Disable,Disable, OvrVoltDerEn 0: Disable Enable} Enable} 1: Enable Only for HECO grid standard. Disable or Enable the slow start PowerMutateRatio function after power mutation. And please refer to 5.4.2.7 (HECO) setting the parameter. ISO detection enable/disable control {Disable,Enable, {Disable,Enable,...
  • Page 75 Table 5-2 The Protection Parameters (IEEE1547-2018 and Rule21) Grid Over Voltage Protection Setup range Parameter name Description Setup range (lower...
  • Page 76 limit, default & (lower limit, upper limit) default & upper IEEE1547-2018 limit) Rule21 Threshold value of {100%, 110%, {100%, 110%, GridVoltMax1 Level 1 Max. grid 135%} 135%} voltage Threshold value of VoltMaxTripTime1(S) Level 1 Max. grid {0, 2, 655} {0, 12.5, 655} trip voltage Threshold value of {100%, 120%,...
  • Page 77 grid voltage Threshold value VoltMinTripTime1(S） of Level 1 Min. {0, 10, 655} {0, 20.5, 655} grid trip voltage Threshold value GridVoltMin2 of Level 2 Min. {30%, 45%, 100%} {30%,70%, 100%} grid voltage Threshold value VoltMinTripTime2(S) of Level 2 Min. {0, 0.16, 655} {0, 10.5, 655} grid trip voltage Threshold value...
  • Page 78 upper limit) upper limit) Rule21 IEEE1547-2018 Protection threshold value of GridF.Max1 {60, 61.2, 66} {60, 60.5, 66} Level 1 Max. grid frequency Trip time of Level FMaxTripTime1(S） 1 Max. grid {0, 299.5, 655} {0, 299.5, 655} frequency Protection threshold value of GridF.Max2 {60, 62, 66} {60, 62, 66}...
  • Page 79 IEEE1547-2018 Protection threshold value of GridF.Min1 {54, 58.5, 60} {54, 58.5, 60} Level 1 Min. grid frequency Trip time of Level 1 FrqMinTripTime1(S） {0, 299.5, 655} {0, 299.5, 655} Min. grid frequency Protection threshold value of GridF.Min2 {54, 56.5, 60} {54, 57, 60} Level 2 Min.
  • Page 80 grid frequency protection The upper limit grid {100%, 110%, {100%, 110%, VoltMax voltage of moving 135%} 135%} average filter The trip time of the upper limit grid MaxTripT {0, 600, 655} {0, 600, 655} voltage of moving average filter The lower limit grid {80%, 88%, {80%, 87.99%, VoltMin...

  • Page 81: Lvrt/Hvrt

    5.4.6 LVRT/HVRT “LVRT/HVRT” is used to set the LVRT (Low voltage ride through ) and HVRT (High voltage ride through ) parameters as following:...
  • Page 82 → Through Trip Time/S 2 4 6 8 10 12 14 16 18 20 22 Figure 5-2 The LVRT Curve 1.25 Through 1.15 5，6,7,8 Trip 1.05 Time/S 2 4 6 8 10 12 14 16 18 20 22 Figure 5-3 The HVRT Curve...
  • Page 83 Table 5-3 LVRT and HVRT Parameters LVRT Setup range (lower Setup range (lower limit, default & Parameter name Description limit, default & upper limit) upper limit) Rule21 IEEE1547-2018 Threshold value of Low voltage ride {0%, 0%, 100%} {0%, 0%, 100%} LVRTVoltPara (1,2) through(first or second {0%, 0%, 100%}...
  • Page 84 eighth point) Time of Level Low voltage ride {0, 20.5, 655} {0, 20.5, 655} LVRTTimePara(7,8) through(seventh or {0, 20.5, 655} {0, 20.5, 655} eighth point) HVRT Setup range (lower Setup range (lower limit, default & upper Parameter name Description limit, default & limit) upper limit) Rule21 IEEE1547-2018...

  • Page 85: Activepowerderating

    Threshold value of {100%, 110%, high voltage ride {100%, 110%, 135%} HVRTVoltPara (5,6) 135%} through (fifth or sixth {100%, 110%, 135%} {100%, 110%, point) 135%} Time of Level high {0, 12.5, 655} {0, 2.5, 655} HVRTTimePara(5,6) voltage ride through {0, 12.5, 655} {0, 12.5, 655} (fifth or sixth point) Threshold value of...
  • Page 86 Power Present 0.0%~100.0% Settable GridV.Max1 Grid voltage 100.00%~135.00% Settable Figure 5-4 Curve of over voltage derating Power Present 0.0%~100.0% Settable Grid Frequency 60.00~72.00Hz GridF.Max1 Settable Figure 5-5 Curve of over frequency derating...
  • Page 87 Table 5-4 Power Derating Setup Setup range (lower Setup range (lower Parameter name Description limit, default & upper limit, default & upper limit) IEEE1547-2018 limit) Rule21 The trigger frequency of OvrFrqMin {60, 60.04,72} {60, 60.04 ,72} OverFrequency derating The end OvrFrqMax {60,62.532,72} {60, 62.034 ,72}...
  • Page 88 Rate of Overfrequency derating (Depends on the specific standard) The Rate of OvrFrqSlop Overfrequency {0.01%,30%,100%} {0.01%,30%,100%} derating. The recovery frequency of RecoveryFrq {58.8, 59.964 ,66} {58.8, 59.964 ,66} OverFrequency derating The recovery time of OvrFrqRecoveryT {0,60,1200} {0,60,1200} OverFrequency derating Resonance VirtualDamping damping {0,0,5}...

  • Page 89: Reactivepowerderating

    power P1 Grid overvoltage VwCurveV2 derating end {100%,110%,135%} {100%,110%,135%} voltage V2 Grid overvoltage VwCurveP2 derating end {0%, 0%,100%} {0%, 0%,100%} power P2 Open loop OpenLoopRespT {0.5,10,90} {0.5,10,90} response time 5.4.8 ReactivePowerDerating “ReactivePowerDerating” menu is used to set the Grid reactive power derating parameters including PF parameters and Qu parameters, etc.
  • Page 90 (1). PF Set：Set the PF value Note: Change the reactive power by adjusting the PowerFactor (2). PF(P) Curve：PF curve mode Note: The power factor changes according to the power change, as shown in Figure 5-4:...
  • Page 91 INSTRUCTION: The PF(P) Curve function is only available for IEEE-1547 grid standards. (PFCurveP1,PFCurvePF1) Inductive (P%) Capacitive (PFCurveP2,PFCurvePF2) Figure 5-6 PF(P) Curve Mode (3). Q(U) Curve：Q(U) curve mode Note: The reactive compensation changes according to the grid voltage change, as shown in Figure 5-5. INSTRUCTION: The Q(U) curve function is only available for IEEE-1547 grid standards.
  • Page 92 Q(%) (QuCurveU2i,QuCurveQ2i) Inductive (QuCurveU1, QuCurveQ1) (QuCurveU1i, U(V) QuCurveQ1i) Capacitive (QuCurveU2,QuCurveQ2) Figure 5-7 Q(U) Curve Mode Table 5-5 Parameters of reactive power control (IEEE1547-2018 and Rule21) Grid Reactive Power Derating Setup range (lower Setup range (lower Parameter name limit, default & upper limit, default &...
  • Page 93 PF(P)Curve point 1 Power of PFpCurveP2 {0%,100%,100%} {0%,100%,100%} PF(P)Curve point 2 PF of PF_PCurvePF2 {-1,-0.8},{-0.9},{0.8,1} {-1,-0.8},{-0.9},{0.8,1} PF(P)Curve point 2 The trigger PFpCurveTriVolt {100%,100%,110%} {100%,100%,110%} voltage of PF(P)Curve The end PFpCurveUndoVolt {90%,90%,100%} {90%,90%,100%} voltage of PF(P)Curve Voltage of QuCurveU1 {100%,102%,110%} {100%,103.3%,110%} Q(U)Curve point 1 Reactive power...
  • Page 94 point 1i Reactive power QuCurveQ1i {-60%,0%,60%} {-60%,0%,60%} of Q(U)Curve point 1i Voltage of QuCurveU2i {80%,92%,100%} {80%,92%,100%} Q(U)Curve point 2i Reactive power QuCurveQ2i {-60%,44%,60%} {-60%,30%,60%} of Q(U)Curve point 2i The trigger QuCurveTriPower {5%,20%,100%} {5%,20%,100%} power of Q(U)Curve The end QuCurveUndoPower {5%,5%,100%} {5%,5%,100%} power of Q(U)Curve...

  • Page 95: Others

    5.4.9 Others Table 5-6 Other Parameters...
  • Page 96 Setup range (lower Setup range (lower limit, default & Parameter name Description limit, default & upper limit) upper limit) Rule21 IEEE1547-2018 PowerOnDelay Startup delay time (1,5,1200) (1,5,1200) PVStartupVolt PV start-up voltage (200, 330 ,400) (200, 330 ,400) The output power should be slow increased due to the {0.01%,10%,...
  • Page 97 reactive current The coefficient of LVRTNegReactiveI negtive sequence {0%,200%,300%} {0%,20%,300%} reactive current Local electric PSet_Pecent dispatch Active {0%,100%,100%} {0%,100%,100%} Power setting value Local electric QSet_Pecent dispatch Reactive {-60%,0%,60%} {-60%,0%,60%} Power setting value Minimum insulation ISOProtection {1k,250k,2000k} {1k,250k,2000k} resistance The static threshold GFCIStaticValue value of Leakage {100, 250 ,1000}...

  • Page 98: Fault Recording

    repetitive control MPPTScanPeriod MPPTScan Cycle {300,3600,5400} {300,3600,5400} 5.5 Fault Recording The last record can store up 128 fault record in “ Fault Record ” menu. 5.6 History There are 2 submenus in the “History” menu: “Alarm” and “Running Status”.

  • Page 99: Turn On/Off

    5.7 Turn ON/OFF Manual Turn ON/OFF: Manual Power ON/OFF is required after regulation setting or manual (fault) shut-down. Touch to submenu “Turn ON/OFF”. Then move the cursor to “Turn ON” to start the inverter, the inverter will start up and operate normally if the start-up condition is met.
  • Page 100 Automatic Turn ON/OFF: The inverter will start up automatically when the output voltage and power of PV arrays meet the set value, AC power grid is normal, and the ambient temperature is within allowable operating range. The inverter will be shut down automatically when the output voltage and power of PV modules are lower than the set value, or AC power grid fails;...

  • Page 101: Fault Shutdown And Troubleshooting

    6. Fault Shutdown and Troubleshooting 6.1 LED Fault and Troubleshooting LED information of CPS SCA25KTL-DO-R/US-480: Interpretation for the indicator lights is shown in Table 6-1 Table 6-1 LED Indication LED light Name Status Indication Light Working Working power power POWER...

  • Page 102: Fault And Troubleshooting

    Light AFCI protection GFCI/AFCI status GFCI/AFCI Flash GFCI fault (light up 0.5s, light off 2s) indication Light No GFCI/AFCI fault or power supply light not working Green Power supply working and grid light checked status Power supply working and grid not indication light checked...
  • Page 103 Table 6-2 Troubleshooting cont'd Definition: Communication inside inverter fails Possible causes: Terminal block connecters internal communication wires have poor contact 1.CommErr Recommended solutions: 1.Observe for 5 minutes and see whether the alarm will be eliminated automatically; 2.Switch off 3-phase working power supply and then reboot the system;...
  • Page 104 will be eliminated automatically; 2.Check for foreign objects on fan blades; 3.Switch off 3-phase work power supply and then reboot the system; 4.Contact after-sales service personnel Table6-3 Troubleshooting cont'd Definition: Internal alarm Warn0030 Recommended solutions: (EepromErr) 1.Observe for 5 minutes and see whether the alarm will be eliminated automatically;...
  • Page 105 1. Raise limit of IDCmax (for example, 400mA) to allow inverter more room to adjust in transient Protect0070 condition to cope with imbalance of impedance and (Bus imbalance) voltage between Grid phases 2. If after adjustment, alarm still occurs, replace inverter 1.
  • Page 106 6.Contact after-sales service personnel Protect0180 1. If the inverter can start up, then recalibrate. (The sampling 2. If the inverter always report this alarm and can offset of DCI) not start up, then replace inverter. 1. Raise limit of DCImax (for example, 400mA) to allow inverter more room to adjust in transient Protect0170 condition to cope with imbalance of impedance and...
  • Page 107 2. Open fuse drawers to de-couple PV strings from each other. Test strings with string test set 3. Add one PV string at a time, and start up inverter to see if alarm occurs. 4. If there is no alarm, turn OFF AC switches to disconnect from Grid and add in the next string.
  • Page 108 1. Measure voltage at DC terminals in wire-box and compare with reading in Measurement menu. PV voltage must be less than 1000V in open circuit condition. PVVoltOver 2. If display reading is not within 2% of meter reading, replace inverter. If display reading is within 2% of meter reading, adjust number of panel in the string.
  • Page 109 1. Restart inverter by recycle both AC and DC Fault0130 switches. Wait for 1 minute between OFF and ON (Bus over total for all energy to discharge. voltage) 2. If inverter cannot clear fault, replace inverter. 1. Raise limit of IDCmax (for example, 400mA) to allow inverter more room to adjust in transient Fault0110 condition to cope with imbalance of impedance and...
  • Page 110 1. Restart inverter by recycle both AC and DC switches. Wait for 1 minute between OFF and ON Fault0060 for all energy to discharge. (CPLD Fault) 2. If inverter cannot clear fault, replace Control Board or inverter 1. Restart inverter by recycle both AC and DC Fault0020 switches.

  • Page 111: Maintenance And De-Installation

    7. Maintenance and De-installation This section defines the activities required to properly maintain the inverter and must be facilitated by qualified personnel, trained in the installation, de-installation and maintenance of inverters. 7.1 Product Maintenance Maintenance is required to ensure the inverter remains in proper condition, prolonging service life and prevent potential issues.

  • Page 112: Replace The Cooling Fans

    Check the air vent grate regularly to make sure it is not blocked. Clean the grate with a soft brush or vacuum cleaner attachment if necessary. The frequency of this cleaning depends on the installation environment. 7.1.3 Replace the Cooling Fans If the internal temperature of the inverter is too high or abnormal noise is heard, assuming the air vent is not blocked and is clean, it may be necessary to replace the external fans.

  • Page 113: Replace The Inverter

    Figure 7-1 Replacing Cooling Fans 7.1.4 Replace the Inverter Please confirm the following items before replacing the inverter: ▪ The AC breaker of inverter is turned off. ▪ The DC switch of the inverter is turned off. Now replace the inverter according to the following steps: 1.
  • Page 114 Figure 7-2 Unlock the padlock 2. Use a No. 3 Phillips head screwdriver to unscrew the 2 screws on both sides of the inverter. Figure 7-3 Remove the screws on both sides 3. Use a No. 10 Hex wrench to remove the 4 screws between the inverter and the wire-box.

  • Page 115: D E - Installing The Inverter

    DANGER: Please disconnect the electrical connection in strict accordance with the following steps. Otherwise, the inverter will be damaged and the service personnel’s life will be endangered. If the replacement inverter is onhand and to be installed immediately, skip this step and refer to section 3.2 for installation of the inverter. Otherwise, use a No.
  • Page 116 Disconnect the AC and PE cables referring to “3.4.1.5 AC and Ground Connection”. Disconnect the DC cables referring to “3.4.1.3 DC Conductor Connection”. Caution: if PV strings terminate directly in the wire-box and do not pass through a breaker or switch that was opened in Step 2 these strings may be energized.

  • Page 117: Accessories

    Field testing at PVEL showed up to 15% reduction in operating temperatures of inverters with shade covers installed in direct sunlight. This report can be found on the CPS America website under application notes. Figure 8-2 Shade Cover installed on CPS 25kW inverter...

  • Page 118: Y-Comb Terminal Block (Optional)

    Terninal 15A fuse 2 pcs (Standard wire-box) Figure 8-3 Y-Comb Terminal Block 9. Technical Data 9.1 Datasheet Model Name CPS SCA25KTL-DO-R/US-480 DC Input Max. PV Power 37.5kW (22kW per MPPT) Max. DC Input Voltage 1000V Operating DC Input Voltage 200-950V...
  • Page 119 DC Disconnection Type Load-rated DC switch DC Surge Protection Type III MOV, 1240V , 15kA I (8/20μS) AC Output Rated AC Output Power 25kW Max. AC Apparent Power 25kVA Rated Output Voltage 480V Output Voltage Range 422-528V 3Φ/PE/N (Neutral optional) Grid Connection Type Max.
  • Page 120 Inverter Monitoring SunSpec, Modbus RS485 Site Level Monitoring CPS Flex Gateway (1 per 32 inverters) Modbus Data Mapping Remote Diagnostics / FW Standard / with Flex Gateway Upgrade Functions Mechanical Data Powerhead: 400mm(W)*200mm(D)*405mm(H) Dimensions (WxHxD) Wire-box: 400mm(W)*200mm(D)*260mm(H) Weight Inverter: 22kg; Wire-box: 6kg...

  • Page 121: Measurement Tolerances

    ±5% for real-time measurements with output power below 20% nominal power ▪ ±3% for real-time measurements with output power above 20% nominal power ▪ ±4% for all statistical data CPS inverter tolerances are specified below: ▪ Voltage tolerances: ±1% ▪ Current tolerances: ±2% ▪ Frequency tolerances: ±0.5% ▪...

  • Page 122: Production Graphs

    9.3 Production Graphs The following sections illustrate the inverter production/derating in terms of ambient temperature, altitude and grid voltage. 9.3.1 High Temperature Derating Graph When the ambient temperature is higher than 113℉ (45℃), the inverter output power (Pn) will begin to derate, as shown in Figure 9-1: Pin/Pn 100% -3%/℃...
  • Page 123 9.3.2 Altitude Derating Graph When the altitude is higher than 8202.1ft (2500m), the rated output power (Pn) of the inverter will decrease, as shown in Figure 9-2: Pin/Pn 100% -30%/km 2500 3000 Altitude(m) Figure 9-2 SCA25KTL Derating Curve with High Altitude 9.3.3 Grid Voltage Derating Graph When the grid voltage is within 100%~110% (Un ~ 1.1*Un) of the Rated Output Voltage, the inverter output power (Pn) may reach 100%.
  • Page 124 Po/Pn 100% 0.88*Un 1.1*Un Grid Voltage (Vac) Figure 9-3 SCA25KTL Derating Curve of Grid Voltage...
  • Page 125 The warranty policy of this product is specified in the contract; otherwise, the standard warranty is 10 years. For service, Chint Power Systems America will provide local support. For Warranty terms, please refer to the CPS America standard warranty policy in place at time of purchase. CHINT POWER SYSTEMS AMERICA CO., LTD.

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