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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
CPS SCA20KTL-DO-R/US-480
and SCA25KTL-DO-R/US-480
Installation and Operation Manual - Rev 1.0
CHINT POWER SYSTEMS AMERICA CO.
Revision 1.0 - Sep 2019

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  • Page 1 CPS SCA Series Grid-tied PV Inverter CPS SCA20KTL-DO-R/US-480 and SCA25KTL-DO-R/US-480 Installation and Operation Manual - Rev 1.0 CHINT POWER SYSTEMS AMERICA CO. Revision 1.0 - Sep 2019...
  • Page 3 Revision History Rev Number Chap/Sec Rev Date Description Sep 2019 Initial Release...

  • Page 4: Table Of Contents

    Table of Contents BEFORE YOU START… ............... 1 1. IMPORTANT SAFETY INSTRUCTIONS..........3 2. OVERVIEW ................10 2.1 I ..........10 NVERTER FOR GRID TIED SYSTEMS 2.2 P ................. 10 RODUCT EATURES 2.3 P ............11 RODUCT ROTECTION UNCTIONS 2.4 A ..........
  • Page 5 3.5 C ............44 OMMUNICATION ONNECTION 3.5.1 ......45 ESCRIPTION OF THE OMMUNICATION OARD 3.5.2 RS485 C ............46 OMMUNICATION 3.5.3 RS485 N ............47 ETWORK 3.5.4 ............48 OMMUNICATION IRING 3.5.5 ..............49 CONNECTION 4 COMMISSIONING (VIA WIRELESS ) ..........50 4.1 APP D ................
  • Page 6 5.4.9 ................91 THERS 5.5 F ................94 AULT ECORDING 5.5.1 ............. 94 IRMWARE PGRADE 5.5.2 ............95 PGRADE THE NVERTER 5.5.3 KIT ............97 PGRADE THE 5.6 H ..................97 ISTORY 5.7 T ON/OFF ................98 6 FAULT SHUTDOWN AND TROUBLESHOOTING ......100 6.1 LED F ..........
  • Page 7 9.1 D ...................118 ATASHEET 9.2 M ............120 EASUREMENT OLERANCES 9.3 P ..............121 RODUCTION RAPHS 9.3.1 ........121 EMPERATURE ERATING RAPH 9.3.2 ...........122 LTITUDE ERATING RAPH 9.3.3 ..........122 OLTAGE ERATING RAPH 9.3.4 ..........123 EACTIVE OWER APABILITY 10 LIMITED WARRANTY ..............125...

  • Page 9: Before You Start

    CPS SCA20KTL-DO-R/US-480 and 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 NOTICE: NOTICE indicates a hazardous situation which, if not avoided, could result in the inverter working abnormally or property loss. AVIS: AVIS indique une situation dangereuse qui, si elle n'est pas évitée, pourrait entraîner un fonctionnement anormal de l'onduleur ou une perte de propriété. INSTRUCTION: INSTRUCTION indicates important supplementary information or provides skills or tips that can be used to help...
  • Page 13 user serviceable parts inside. Refer servicing to qualified service personnel. WARNING: Electric shock hazard. The DC conductors of this photovoltaic system are ungrounded and may be energized. CAUTION: Risk of electric shock. a) Both ac and dc voltage sources are terminated inside this equipment.
  • Page 14 entretien. b) Quand les panneaux photovoltaïque sont exposés à la lumière, ils fournissent une tension en courant continu à l´équipement. ATTENTION: Risque de choc électrique. Les conducteurs DC de ce système photovaltaic ne sont pas mis à la terre normalement, mais deviendra mis à la terre par intermittence lorsque l'onduleur mesure l'isolement du champ photovoltaique.
  • Page 15 risques d'incendie, il faut remplacer les fusibles de même type et courant. WARNING: Hazardous voltage area under the plastic cover. Do not open fuse holders under load ! Protective gear must be used/worn before accessing fuses ! Do not open fuse holders if bypass terminals were installed ! ATTENTION: Zone de tension dangereuse sous le couvercle en...
  • Page 16 WARNING: All the installation and wiring connections must be performed by qualified technical personnel. Disconnect the inverter from the PV modules and the AC grid before maintaining or servicing the equipment. 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! Risk of electric shock and fire.
  • Page 17 equipment. The inverters are to be installed with floating or ungrounded PV arrays only. CAUTION: SCA20KTL-DO-R/US-480 SCA25KTL-DO-R/US-480 inverters weigh approximately 22kg (48.5 pounds). The wirebox portion weighs approximately 6kg (13.2 pounds). Ensure the mounting bracket is properly installed before hanging the inverter and wirebox on the bracket.

  • Page 18: Overview

    2. Overview 2.1 Inverter for grid-tied PV systems CPS SCA20KTL-DO-R/US-480 and 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...

  • Page 19: 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 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 20: Appearance And Main Item Description

    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 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: Main inverter enclosure...

  • Page 21: Schematic Diagram And Circuit Design

    LED indicator lights AC switch: AC power on/off DC switch: DC power on/off 2.5 Schematic Diagram and Circuit Design The basic electrical schematic diagram of CPS SCA20KTL-DO-R/US-480 and SCA25KTL-DO-R/US-480 inverters are shown in Figure 2-3. The input from PV source circuits passes through surge protection circuitry, DC EMI wave filters, and independent DC-DC boost circuitry to achieve maximum power point tracking and boost the voltages to a common DC bus.

  • Page 22: Anti-Islanding Detection

    2.6 Anti-islanding Detection The CPS SCA20KTL-DO-R/US-480 and 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 injecting a small amount of reactive power to detect a possible islanding condition.

  • Page 23: Installation

    3. Installation This chapter describes the planning and installation procedures for the SCA20KTL-DO-R/US-480 and SCA 25KTL-DO-R/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 one package, consisting of A.) the main inverter enclosure and B.) the wirebox, mounting bracket, quick installation guide, and accessory kit.

  • Page 24: Recommendations Before Installation

    Table 3-2 Accessory Kit Item Q’ty Note 4 for securing the wiring box to the main enclosure; 6 for securing the M6 X18mm Phillips inverter to the mounting bracket; 1 screw for the External Ground connection, 1 spare 6 pin PCB connector For the RS485 communication plug 2 pin PCB connector...
  • Page 25 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). Pre-installation checklist Check that the inverter environmental specifications (protection degree, operating temperature range, humidity and altitude, etc) meet the requirements of the specific project location.
  • Page 26 DC and AC power connected to the inverters under normal operation. The CPS inverter enclosures are designed to conform to NEMA4 (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 27: Mechanical Installation

    3.2 Mechanical Installation 3.2.1 Dimensions 200.0±1mm 400.0±1mm (7.9in.) (15.7in.) 5m in CAUTION: Ri s k of e l e ctric shock from energy stored i n ca pacit o r. Do not remo ve cove r until 5 minutes after disconnecting all sources of supply.
  • Page 28 If the inverter cannot be mounted vertically, it may be tilted backward at 15-90°angle from vertical to horizontal. When inverter is installed under direct sunlight, the CPS Shade Cover (SSC-25ST-2) accessory is required to be installed. See Section 8.2 more information.

  • Page 29: Installation Space Requirement

    3.2.3 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.

  • Page 30: 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 bracket to the metal frame firmly with the screws fastener. (screws are not supplied by manufacturer and the holes of bracket is 10mm)
  • Page 31 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 SCA20KTL-DO-R/US-480 and SCA25KTL-DO-R/US-480 inverters approx 22kg (48.5 pounds).
  • Page 32 2. Install the wiring box Remove screws securing the bulkhead cover at the top of the wiring box. Figure 3-7 Wiring Bulkhead Cover Save the bulkhead cover and screws, and attached the cover to the left side of the wiring box after the wiring box is attached to the inverter enclosure.
  • Page 33 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 wirebox to the upper/main enclosure.” Figure 3-8 Installation of the Wiring Box 4.
  • Page 34 Figure 3-9 Secure the Main Enclosure and Wiring Box to the Bracket 5. Attach the bulkhead cover shown in Figure 3-7 to the left side of the wiring 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 35 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 36: 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 37 Figure 3-14 Removing the Wiring 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. Torque to 35.4 in-lbs (4 N.m.) INSTRUCTION: It is important to use hand tools (e.g. Screwdriver or T-handle, #3 Phillips) and not power drivers or other types of screw drivers.

  • Page 38: Wiring Boxes

    3.4 Wiring boxes 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 COM M. P ORT LI NKIT A C OUTPUT For m ore de tail s please see t he user manual. W ARNING: High touch current . VE NT E art h connect ion essent ial before connect ing supply.

  • Page 39: Dc Connection

    Figure 3-16 Internal Connection Points within the wirebox DC Input fuse holder/terminal (positive) DC Input terminal (negative) Communication board Internal ground terminal RSD transmmiter 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 40 array or with arrays consisting of different tilt or azimuth. Each MPPT employs a method known as 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 41 3.4.1.2 DC Fuse Configuration/Selection The CPS SCA20KTL-DO-R/US-480 and 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 string and by performing PV fuse sizing calculations for each string.
  • Page 42 15A, 20A, 25A, or 30A 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,...
  • Page 43 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 44 Ensure correct polarity of the PV Strings before terminating the DC source circuits. Referring to Figure 3-18, the wiring from the PV string pairs must be checked according to the following steps: Use a multi-meter to measure the PV strings’ conductor ends and check the polarity.
  • Page 45 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) 3.4.1.4 DC Connection for Wiringbox 1-1/2 inch openings. Remove the factory installed liquid-tight hole plugs from the DC knockout holes in the wiring box and install 1-1/2 inch Trade Size conduit and conduit fittings.

  • Page 46: Ac And Ground Connection

    Bypass Terminal option for wirebox. Fuse Bypass Terminals are available as an optional accessory when external PV string fused combiners are used. The Bypass Terminals allow for larger single conductors to be terminated at each MPPT within the wirebox, bypassing the input fuses as shown in Figure 3-19.
  • Page 47 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 48 Table 3-6 Tools Required for Cable termination Tools Remark #2 flat screwdriver Internal grounding bar #3 Phillips head screwdriver External grounding 5mm socket head wrench AC terminal block Diagonal pliers or cable cutters Cut cable Wire stripping pliers Remove jacket Crimping pliers/tool Crimp terminal Using the 1-1/2 inch knockouts.
  • Page 49 DC INPUT For more detail s please see the user manual. WARNING: High touch current . Ea rth conne ction essential before connecting supply. Figure 3-21 AC Output and Ground Cable Connection...
  • Page 50 Table 3-7 Torque and Conductor Specifications Connection Point Conductor Range Torque Value 8-2 AWG (90 AC output 14 N-m (120 in-lbs) 6-2 AWG (90 6-4 AWG (CU) 5.6 N-m (50 in-lbs) INSTRUCTION: The neutral conductor from the inverter to point of interconnection (POI) is optional.
  • Page 51 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 wiring box. The bonding point is located at the bottom of the wirebox as shown in Figure 3-23.

  • Page 52: Communication Connection

    Table 3-8 Specification of AC breaker selection Inverter Min AC OCPD Max AC OCPD CPS SCA20KTL-DO-R/US-480 CPS SCA25KTL-DO-R/US-480 3.5 Communication Connection CPS SCA20KTL-DO-R/US-480 and SCA25KTL-DO-R/US-480 inverters support industry standard Modbus RS485 communication. The communication board is in different places in the standard (Figure 3-24).

  • Page 53: Description Of The Communication Board

    Figure 3-24 Communication Board of wirebox 3.5.1 Description of the Communication Board RS485 (Reserved) Power port (2pin connector) +12V RS485 port (6pin connector) 485_A 485_B 485_GND 485_A 485_B 485_GND Selector Switch (S201): 120 terminal resistor switch for communications. ON: Enable the termination resistance OFF: Disable termination Figure 3-25 Communication...

  • Page 54: 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 55: 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...

  • Page 56: 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 120 terminal resistor enabled. The selector switch S201 of all other inverters should be in the OFF position to disable the terminal resistor.

  • Page 57: Rsd Connection

    3.5.5 RSD connection Figure 3-28 RSD Connection The connection of RSD is installed in the factory. The power supply is from a 4-pin connector on the communication board. If it is the first time to be powered on when the inverter is without AC power, external power supply is needed to match with the 4-pin connector.

  • Page 58: Commissioning (Via Wireless )

    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 Make sure that the mounting bracket is secure and all the screws have been tightened to the specified torque values.

  • Page 59: Electrical Check

    Access Point from the user devices (tablet, smartphone,etc.), connection to the inverter via Wi-Fi . Open the APP (CPS Connect previously mentioned) Enable the wireless connection on the device which is being used for the board...
  • Page 60 Please input the password “Password” then setting the grid “GridStandard, PV Link Type, Neutral Line, RS485, Inverter Clock, Change Password” as shown in Figure 4-1.
  • Page 61 Figure 4-1 System setting GridStandard: Seleting 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 62 PV Link Type: The working mode of the DC input connection and MPP Tracker can only be configured for Parallel. Neutral Line Setting: Setting the neutral line connect or not. RS485: Choosing the communication data Modbus Address and Baud Rate Inverter Clock: Setting the system clock.
  • Page 63 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 64: App Interface

    5 APP Interface 5.1 Overview Firuge 5-1 App Interface Interview 5.2 Main section In the MAIN section it’s possible to access the following sub-menus: Running Data Settings History Turn ON/OFF...

  • Page 66: 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 67: Settings

    5.4 Settings Choosing the Settings and input the password“1111”as following: In the Settings section it’s possible to access the following sub-menus: Inverter Parameters Read/Write Register Upgrade Firmware...

  • Page 68: 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 69: 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 70: Commands

    5.4.3 Commands In the Read/Write Register section it’s possible to access the following sub-menus: Power On/Off ForceRestart FactoryDefaults AutoTest(CEI) MPPTScan ArcDetect ArcClear PFSetValueRemote PSetPercentRemote QSetPercentRemote FreqLv2PrtEn(CEI)
  • Page 71 “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. The user can perform a force reboot for one time per Power on in this menu if the user needs to restart the inverter.

  • Page 72: Enable/Disable

    signal to ensure safety. The Arcing board failure will cause ‘ARC board err’ shown on the device and it will not connect to the grid until the arc board is OK. If there is Arcing fault, the device displays the fault which can only be cleared manually.
  • Page 74 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 inverter loop 1:Article 1 groups, control parameter setting of...
  • Page 75 3: Local control ,by PF 4: PF(P)curve 5: Q(U) curve (Association register address= 0x2200. 0x250F.0x2707. 0x2709) 6:Q(P)Curve The control mode of active power 0: Disable dispatch mode. {Disable, Disable, {Disable, Disable, ActivePwModeSelect 1: Remote dispatch mode. Remote,Local} Remote,Local} 2: Local control. (Association register address=0x250E.0x2708) MPPT scan...
  • Page 76 0: Disable 1: Enable {Disable, Enable {Disable, Enable 0: Disable reactive power reactive power 1:Enable no power output output , Enable no output , Enable no 2:Enable reactive power power output, power output, LVRTModeSetting output Enable reactive Enable reactive 3:Enable active power power output , power output , output...
  • Page 77 setting the grid protect parameters Enable/disable control of limiting the upper of {Disable,Disable, {Disable,Disable, VoltMaxMovAvgEn moving average filter Enable} Enable} 0: Disable 1: Enable Enable/disable control of limiting the lower of {Disable,Disable, {Disable,Disable, VoltMinMovAvgEn moving average filter Enable} Enable} 0: Disable 1: Enable GFCI static detection enable/disable control...
  • Page 78 4 Reserver 5 Reserver DCI protection1 enable/disable control {Disable,Enable, {Disable,Enable, DCIProtection1En 0: Disable Enable} Enable} 1: Enable DCI protection2 enable/disable control {Disable,Disable, {Disable,Disable, DCIProtection2En 0: Disable Enable} Enable} 1: Enable Unbalance rate of grid voltage detection {Disable,Enable, {Disable,Enable, GridVoltUnbalanceEn enable/disable control Enable} Enable} 0: Disable...

  • Page 79: Protect

    0: Disable 1: Enable The AC SPD test enables settings {Disable,Disable, {Disable,Disable, ACSPDDetectEnSet 0: Disable Enable} Enable} 1: Enable Operating overvoltage detection enables setting {Disable,Disable, {Disable,Disable, OperationOverVolEn 0: Disable Enable} Enable} 1: Enable 5.4.5 Protect This interface is used to display and set the Protect parameters of the AC grid voltage, frequency and recovery, etc as following:...
  • Page 80 Table 5-2 The Protection Parameters (IEEE1547-2018 and Rule21) Grid Over Voltage Protection Setup range (lower Setup range limit, default & (lower limit, Parameter name Description upper limit) default & upper IEEE1547-2018 limit)Rule21 Threshold value of {100%, 110%, {100%, 110%, GridVoltMax1 Level 1 Max.
  • Page 81 Threshold value of VoltMaxTripTime2(S) Level 2 Max. grid {0, 0.16, 655} {0, 0.16, 655} trip voltage Threshold value of {100%, 120%, {100%, 120%, GridVoltMax3 Level 3 Max. grid 135%} 135%} voltage Threshold value of VoltMaxTripTime3(S) Level 3 Max. grid {0, 0.16, 655} {0, 0.16, 655} trip voltage Grid Low Voltage Protection...
  • Page 82 grid voltage Threshold value VoltMinTripTime3(S) of Level 3 Min. {0, 0.16, 655} {0, 1.5, 655} grid trip voltage Recovery {80 %, 107.92%, {80%, 107.99%, VMaxRov Maxthresholdgrid 135%} 135%} voltage protection Recovery Min VMinRov(V) threshold. grid {20%, 90%, 100%} {20%, 90%, 100%} voltage protection Recovery time of VRcovT(S)
  • Page 83 frequency Trip time of Level FMaxTripTime2(S 2 Max. grid {0, 0.16, 655} {0, 0.16, 655} frequency Protection threshold value of GridF.Max3 {60, 62, 66} {60, 62, 66} Level 3 Max. grid frequency Trip time of Level FMaxTripTime3(S 3 Max. grid {0, 0.16, 655} {0, 0.16, 655} frequency...
  • Page 84 Min. grid frequency Protection threshold value of GridF.Min3 {54, 56.5, 60} {54, 57, 60} Level 3 Min. grid frequency Trip time of Level 3 FMinTripTime3(S {0, 0.16, 655} {0, 0.16, 655} Min. grid frequency Recovery Max thresholdgrid FMaxRcov(Hz) {54, 61.1, 66} {54, 60.4, 66} Frequency protection...

  • Page 85: Lvrt/Hvrt

    The trip time of the lower limit grid MinTripT {0, 600, 655} {0, 600, 655} voltage of moving average filter Unbalance rate of GridVoltUnbalance (0.01%,10%,10%) (0.01%,10%,10%) grid voltage 5.4.6 LVRT/HVRT Low voltage ride through “LVRT/HVRT” is used to set the LVRT ( High voltage ride through HVRT ( ) parameters as following:...
  • Page 86 Figure 5-2 The LVRT Curve...
  • Page 87 Figure 5-3 The HVRT Curve 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...
  • Page 88 throught( first or second point) Threshold value of Low voltage ride {0%, 45%, 100%} {0%, 50%, 100%} LVRTVoltPara (3,4) through(third or fourth {0%, 45%, 100%} {0%, 50%, 100%} point) Time of Level Low voltage ride {0,0.16, 655} {0,1.2, 655} LVRTTimePara(3,4) through(third or fourth {0, 10.5, 655} {0, 10.5, 655}...
  • Page 89 HVRT Setup range (lower Setup range (lower limit, default & upper Parameter name Description limit, default & limit) upper limit) Rule21 IEEE1547-2018 Threshold value of {100%, 125%, {100%, 125%, high voltage ride 135%} HVRTVoltPara (1,2) 135%} through(first or {100%, 125%, {100%, 125%, second point) 135%}...

  • Page 90: Activepowerderating

    voltage ride {0, 12.5, 655} {0, 12.5, 655} through(fifth or sixth point)) Threshold value of {100%, 110%, high voltage ride {100%, 110%, 135%} 135%} HVRTVoltPara (7,8) through(seventh or {100%, 110%, 135%} {100%, 110%, eighth point) 135%} Time of Level high voltage ride {0, 12.5, 655} {0, 12.5, 655}...
  • Page 91 Figure 5-5 Curve of over frequency derating...
  • Page 92 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 frequency or Rate of Overfrequency...

  • Page 93: Reactivepowerderating

    damping coefficient Operating OperationOverVol overvoltage {100%,120%,135%} {100%,120%,135%} protection value Grid overvoltage VwCurveV1 derating starting {100%, 106%,110%} {100%, 106%,110%} voltage V1 Grid overvoltage VwCurveP1 derating starting {0%,100%,100%} {0%,100%,100%} power P1 Grid overvoltage VwCurveV2 derating end {100%,110%,135%} {100%,110%,135%} voltage V2 Grid overvoltage VwCurveP2 derating end {0%, 0%,100%}...
  • Page 94 (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 95 INSTRUCTION: The PF(P) Curve function is only available for IEEE-1547 grid standards. 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 96 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 & upper Description limit) IEEE1547-2018 limit) Rule21 Local Power PFSetValue {-1,-0.8},{1},{0.8,1}...
  • Page 97 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 98 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 99: Others

    5.4.9 Others...
  • Page 100 Table 5-6 Other Parameters 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...
  • Page 101 The coefficient of LVRTPstReactiveI positive sequence {0%,150%,300%} {0%,150%,300%} 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}...

  • Page 102: Fault Recording

    Parameter of DuplicationControl {0%,0%,100%} {0%,0%,100%} 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. 5.5.1 Firmware Upgrade Installer open the APP – Chint Powet Connect and select Firmware. Make sure the mobile phone can access the Internet.

  • Page 103: Upgrade The Inverter

    Firmwares have been released on Cloud Firmwares have been downloaded in-Pocket. 5.5.2 Upgrade the Inverter Click Upgrade and connect to LinKIT Select the firmware file, enter the password and click Start to upgrade the Inverter.

  • Page 105: Upgrade The Linkit

    5.5.3 Upgrade the LinKIT Connect to Chint Power Connect Click Upgrade to upgrade the linKIT 5.6 History There are 2 submenus in the “ History” menu: “Alarm” and “Running Status”.

  • Page 106: 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. Otherwise, the inverter will go to stand-by mode.
  • Page 107 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 108: Fault Shutdown And Troubleshooting

    6 Fault Shutdown and Troubleshooting 6.1 LED Fault and Troubleshooting LED information of CPS SCA20/25KTL-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 109: 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 110 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 111 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 112 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 113 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 114 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. 3.If there is no alarm, turn OFF AC switches to disconnect from Grid and add in the next string.
  • Page 115 1. Measure voltage at DC terminals in wiring 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 Protect0230...
  • Page 116 Table 6-4 Troubleshooting cont'd 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.
  • Page 117 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 118: Maintenance And De-Installation

    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 119: Replace The Cooling Fans

    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. Please refer to Figure 7-1 for replacing the cooling fans.

  • Page 120: Replace The Inverter

    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. Unlock the padlock if one is installed on the inverter. Figure 7-2 Unlock the padlock 2.
  • Page 121 3. Use a No. 10 Hex wrench to remove the 4 screws between the inverter and the wiring box. Lift the inverter enclosure and disconnect from the wiring box. Figure 7-4 Disconnect the main housing from the wiring box 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.

  • Page 122: D Einstalling 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. 7.2 De-installing the Inverter De-install the inverter and wire box assembly according to the following steps when the inverter needs to be removed: Turn off the external AC breaker and/or system disconnect switch using lock-out/tag-out procedures.

  • Page 123: Accessories

    Accessories The CPS SCA20KTL-DO-R/US-480 and SCA25KTL-DO-R/US-480 inverters have several optional accessories that allow the inverter to support a wide range of real world applications. 8.1 Fuse Bypass Terminals The Fuse Bypass Terminals allow for a reduction in the number of DC homeruns by combining the PV source circuits outside of the inverter wirebox and terminating with one pair of DC inputs to each of the two MPPTs.

  • Page 124: Shade Cover (Ssc-25St-2)

    Figure 8-1 Bypass terminal installed 8.2 Shade Cover (SSC-25ST-2) 8.2.1 Protection from Harsh Conditions Shade covers provide added protection for inverters against harsh environmental conditions like direct sunlight, snow, sleet, ice, hail, and reduce soiling from dust and birds. Protect your inverter for many years. 8.2.2 Increased Energy Production Depending on the application and environment, shade covers will help to increase energy production by reducing potential power derating due to...

  • Page 125: Y-Comb Terminal Block (Optional)

    This report can be found on the CPS America website under application notes. Figure 8-2 Shade Cover installed on CPS 20/25kW inverter 8.3 Y-Comb Terminal Block (Optional) The Y-Comb is intended for use in the SCA20/25KTL-DO-R/US-480 inverters.

  • Page 126: Technical Data

    Technical Data 9.1 Datasheet Model Name SCA20KTL-DO-R/US-48 SCA25KTL-DO-R/US-480 DC Input Max. PV Power 30kW (15kW per MPPT) 38kW (19kW per MPPT) Max. DC Input Voltage 1000V Operating DC Input Voltage 200-950V Range Start-up DC Input Voltage / 330V / 80W Power Number of MPP Trackers MPPT Voltage Range...
  • Page 127 Display and Communication User Interface and Display LED+Wi-Fi 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)

  • Page 128: 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% Power tolerances: ±3% Time tolerances: ±1%...

  • Page 129: 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: Figure 9-1 SCA20/25KTL Derating Curve with High Temperature...

  • Page 130: Altitude Derating Graph

    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: Figure 9-2 SCA20/25KTL 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 131: Reactive Power Capability

    Figure 9-3 SCA20/25KTL Derating Curve of Grid Voltage 9.3.4 Reactive Power Capability The Reactive Power Overload function is disabled by factory default (Max. AC Apparent Power is 20/25kVA and Max. AC Output Current is 25A/31A). Contact CPS Customer Service if you want to enable the function.
  • Page 132 Figure 9-4 SCA20/25KTL Reactive Power Capability...

  • Page 133: Limited Warranty

    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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