CPS SCA25KTL-DO/US-208 Installation And Operation Manual
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CPS SCA25KTL-DO/US-208 Installation And Operation Manual

Grid-tied pv inverter
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CPS SCA Series Grid-tied PV Inverter
CPS SCA25KTL-DO/US-208
Installation and Operation Manual – Rev 1.2
CHINT POWER SYSTEMS AMERICA CO.
Revision 1.2 - June 2023

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Summary of Contents for CPS SCA25KTL-DO/US-208

  • Page 1 CPS SCA Series Grid-tied PV Inverter CPS SCA25KTL-DO/US-208 Installation and Operation Manual – Rev 1.2 CHINT POWER SYSTEMS AMERICA CO. Revision 1.2 - June 2023...

  • Page 3: Table Of Contents

    Table of Contents BEFORE YOU START… ................1 IMPORTANT SAFETY INSTRUCTIONS ..........3 OVERVIEW ..................9 ............9 NVERTER FOR GRID TIED SYSTEMS ................10 RODUCT EATURES ..........11 RODUCT ROTECTION AND UNCTIONS ............... 12 MART NVERTER UNCTIONS ........... 13 PPEARANCE AND ESCRIPTION ..........
  • Page 4 ............57 OMMUNICATION ONNECTION 3.4.1 Description of the Communication Board ......58 3.4.2 RS485 Communication ............58 3.4.3 RS485 Network Set-up ............59 3.4.4 Communication Wiring ............61 USER INTERFACE ................62 LCD P ............... 62 ESCRIPTION OF ANEL ................64 PERATION TATE ................
  • Page 5 6.3.2 Automatic Turn ON/OFF............108 ................109 ISTORY ECORD ............... 110 EVICE NFORMATION ..................111 TART .................. 111 ................111 PERATION ............112 TIED OWER ENERATION 6.10 F ............... 113 IRMWARE PGRADE FAULT SHUTDOWN AND TROUBLESHOOTING ......116 LED F ............
  • Page 6 10.3.2 Altitude Derating Graph ............136 10.3.3 Grid Voltage Derating Graph ..........137 10.3.4 PV Voltage Derating Graph..........138 10.3.5 Reactive Power Capability ........... 139 LIMITED WARRANTY ..............140...

  • Page 7: Before You Start

    CPS SCA25KTL-DO/US-208 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 8 Thank you for choosing a CPS SCA 25KTL-DO/US-208 3-Phase String Inverter. This PV Inverter is a high performance and highly reliable product specifically designed for the North American Solar market. Instructions inside this user manual will help you solve most installation and operation difficulties.

  • Page 9: Important Safety Instructions

    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 10 Warnings and 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.
  • Page 11 Warnings and Markings on the product (cont'd) 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! PERSONAL PROTECTIVE EQUIPMENT MUST BE USED/WORN BEFORE ACCESSING FUSES! WARNING:...
  • Page 12 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. Risk of electric shock and fire. Use only with PV modules that have a maximum system voltage of rating of 1000V higher.
  • Page 13 CAUTION: CPS SCA 25KTL-DO/US-208 inverter weighs approximately 56kg (123.5 pounds). The wirebox portion weighs approximately 15kg (33 pounds). Ensure the mounting bracket is properly installed before hanging the inverter and wirebox on the bracket. A team of two is recommended to lift and place the inverter and wirebox into position.
  • Page 14 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. If there is a fault and it is safe to access the inverter: 1.

  • Page 15: Overview

    Overview Inverter for grid-tied PV systems CPS SCA 25KTL-DO/US-208 3-Phase transformerless string inverters are designed for use with an UNGROUNDED PV 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 16: 2.2 Product Features

    3 MPPTs: Multi-channel MPPT (Maximum Power Point Tracker) enables maximum design flexibility and energy harvest optimization over the life of the system. ▪ Separable Wirebox: The SCA25KTL-DO/US-208 includes a rapid shutdown wirebox with integrated PLC transmitter for use with APS RSD- S-PLC/RSD-D products. ▪...

  • Page 17: Product Protection And Functions

    Product Protection and Functions AC output voltage and frequency monitoring ✓ Anti-islanding detection with bi-directional frequency perturbation ✓ ✓ DC input and AC output over-voltage protection ✓ DC input and AC output over-current protection ✓ DC input insulation to ground monitoring ✓...

  • Page 18: Smart Inverter Functions

    Smart Inverter Functions The CPS SCA25KTL-DO/US-208 3-Phase String Inverters employ Smart Inverter (Grid Support) Functions in compliance with UL1741-SA, SA8- SA18 and UL1741-SB standards. The default activation status is indicated below. Smart Inverter Function IEEE1547-2018 Rule 21 ISO-NE Anti-islanding Enabled...

  • Page 19: Appearance And Main Item Description

    Appearance and Main Item Description Figure 2-2 Diagram of the Inverter Assembly Main Items of the Inverter: ① Main inverter enclosure ② Inverter wirebox ③ Inverter mounting bracket ④ Cooling fans ⑤ LED indicator lights ⑥ User LCD display ⑦ User Key buttons ⑧...

  • Page 20: Schematic Diagram And Circuit Design

    Schematic Diagram and Circuit Design The basic electrical schematic diagram of the CPS SCA 25KTL-DO/US-208 3-Phase String Inverters are shown in Error! Reference source not found.. 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 21: Anti-Islanding Detection

    Note: the negative fuses have been removed from this model in accordance with 690.9(C). Anti-Islanding Detection The SCA25KTL-DO/US-208 3-Phase String 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 22: Surge Suppression

    Surge Suppression Table 2-1 Standard Waveform Peak Values Standard Waveform Peak Values Surge Category Ring Wave Combination Wave 6kV/0.5kA 6kV/3kA "Standard 1.2/50 μs - 8/20 us Combination Wave" ▪ ▪ "Standard 0.5 μs - 100 kHz Ring Wave" DC Arc-fault Protection 2.10 The inverter includes DC Arc-fault detection compliant with UL 1699B.

  • Page 23: Installation

    Installation This chapter describes the planning and installation procedures for the SCA25KTL-DO/US-208 3-Phase String Inverter. 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 and B.) the wire-box, mounting bracket, user manual, and accessory kit.
  • Page 24 For the AC terminal block M8 Flat washer For the AC terminal block M8 Spring washer For the AC terminal block Phillips screw Spare (for wire-box cover) INSTRUCTION: Additional accessories for the CPS 25kW-208V inverter are available and can be purchased separately.

  • Page 25: Recommendations Before Installation

    Sealing conduits at the other end will provide additional protection – firestop putty may be used. NOTICE: The allowable ambient temperature ranges for the SCA25KTL-DO/US-208 3-Phase String Inverter is defined based on the following conditions: Condition 1: -40°C to 70°C, Inverter not installed, and in storage (in packaging or unpackaged).
  • Page 26 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. ✓ Make sure that the electric utility grid voltage is within range for the grid standard chosen.
  • Page 27 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 28: Mechanical Installation

    15° from horizontal. (c) When tilted backward at ≤75° from horizontal in an outdoor environment, the CPS Shade Cover (SSC-60ST) accessory is required to be installed. See Section 9.2 for more information. (d) Do not mount the inverter leaning forward.
  • Page 29 SHADE COVER >15 b.) SHADE COVER REQUIRED a.) NO SHADE COVER REQUIRED c.) NOT > 90° TILTED FORWARD d.) NOT UPSIDE DOWN Figure 3-2 Inverter Mounting Options...

  • Page 30: 3.2.3 Installation Space Requirement

    NOTICE: When the inverter is mounted tilted backward at ≤75° from horizontal in an outdoor environment, the CPS Shade Cover (SSC-60ST) accessory must be installed on the inverter to avoid direct sunlight. NOTICE: The spacing between two adjacently mounted inverters must be ≥19.7in (500mm).
  • Page 31 ≥16in (406mm) provided a baffle is installed. Installing an aluminum or galvanized steel baffle (Not supplied by CPS) with the dimensions detailed above is intended to divert or deflect warm exhaust air from entering the adjacent inverter.
  • Page 32 8in. 12in. 12in. 12in. Figure 3-5 Inverter Pillar or Column Mounting Dimensions INSTRUCTION: If the inverter is installed on a pillar or column (instead of solid wall), the space from the bottom of one inverter to the top of the inverter below may be as small as 11.8in (300mm).

  • Page 34: Mounting The Inverter Onto The Bracket

    3.2.4 Mounting the Inverter onto the Bracket Locate and mark the 8 holes on the wall, PV racking structure, Step 1 or bearing surface for attaching the inverter mounting bracket as shown in Figure 3-6. Figure 3-6 Dimensions of the Bracket Anchoring Holes for Mounting (a) PV Racking Mount: Locate holes or anchors at the marked positions;...
  • Page 35 (b) Concrete Wall Mount: Drill holes at the marked positions with a 0.4in. (10mm) masonry bit and insert M8 Expansion Anchors into the holes (expansion anchors not provided); Fasten the Mounting Bracket with the M8x25 Assembling Bolts (not provided). Figure 3-7 and Figure 3-8. Tools Required: Electric drill (Ф10mm/0.4in.
  • Page 36 Figure 3-10 and mount it onto the bracket. CAUTION: The main enclosure of the CPS SCA25KTL-DO/US-208 3-Phase String Inverters is approximately 56kg (123.5 pounds). Ensure the mounting bracket is properly installed and secured before hanging the inverter on the bracket.
  • Page 37 Figure 3-9 Mount the Main Enclosure on the Bracket by Lifting Sling (eye nuts required) Figure 3-10 Grab Handle Position...
  • Page 38 Install the wirebox: Step 3 Remove the cover plate at the bottom of the main enclosure. Tool required: No. 2 Phillips head screwdriver Remark: the covers shown below do not have waterproof function. Figure 3-11 Main Enclosure Cover Plate Remove screws securing the bulkhead cover at the top of the wirebox –...
  • Page 39 inverter enclosure. Covers may be required in the future if an inverter or wirebox is to be removed during servicing (see step 6, Figure ). Tool required: No.2 Phillips head screwdriver 3-15 Secure the wirebox to the main enclosure by using the M6x18 Step 4 screws (4pcs) to fasten the wirebox.
  • Page 40 Figure 3-14 Secure the Main Enclosure and Wiring Box to the Bracket Attach the bulkhead cover shown in Step 6 Figure to the left side of the wiring box. (see 3-12 Step 7 Figure ). Tool required: No. 2 Phillips head screwdriver, 3-15 Step 8 torque value of 1.6N.m (14.2in-lbs)
  • Page 41 Optional - Install an anti-theft padlock when the installation is Step 9 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 ( Step 10 Figure 3-16 Step 11...
  • Page 42 The anti-theft padlock should meet the dimensional requirements shown in Figure 3-17. Recommended lock size: A: Shackle diameter 3~6mm B: Shackle width 20~50mm C: Shackle height 20~50mm Figure 3-17 Dimensions of Anti-Theft Padlock Shackle...

  • Page 43: Electrical Installation

    Product Downloads link to access the CPS String Sizing tool. This is an optional design tool to help guide designers by matching the PV panel type and quantity to the inverter’s power rating.
  • Page 44 Use a No. 3 Philips head screwdriver to remove the 4 screws on the wiring box and remove the cover. (See Figure 3-19) Figure 3-19 Removing the Wiring Box Cover To reinstall the cover, replace cover and align the screws. Use a No.

  • Page 45: 3.3.2 Wiring Box

    3.3.2 Wiring Box 19.29in(490mm) 17.83in(453mm) 16.34in(415mm) 12.05in(306mm) 8.97in(228mm) 5.90in(150.00mm) 0.32in(8mm) DC INPUT COMM. PORT 4.29in(109mm) AC OUTPUT 2.87in(73mm) ④ ② ③ ① ② ③ Figure 3-20 Conduit Knock-out Locations on the wire-box ① Three knock-outs for DC input, 1-1/2 inch Trade Size (1.98" Dia) and (1) removable gland plate for custom size conduit (i.e.
  • Page 46 Figure 3-211 Internal Connection Points within the wirebox （only for CPS SCA25KTL-DO/US-208） ⑤ DC Input fuse holder/terminal ⑥ DC SPD (Surge Protective Device) ⑦ Internal ground terminal(s) ⑧ AC output terminal block ⑨ Negative DC input busbar ⑩ Rapid Shutdown transmitter...

  • Page 47: Dc And Ground Connection

    3.3.3 DC and Ground Connection Working mode 3.3.3.1 These inverters are factory configured with three MPPTs which are electrically divided into separate PV input zones: PV Input-1, PV Input-2, and PV Input-3. Each 5-string PV input zone operates as a separate and independent Maximum Power Point Tracker (MPPT).
  • Page 48 Table 3-3 DC Input Specifications (Independent Mode) Specification (Independent Mode - per MPPT) Model SCA25KTL-DO/US-208 17kW Max PV Power (Combined ≤ 45Kw) Max PV Voltage 1000Vdc Start-up 330 / 80W Voltage / Power Operating Voltage 200-950Vdc MPPT Voltage Range 480-850Vdc Maximum PV Current (Isc x 1.25)
  • Page 49 AFCI and may increases the possibility of false DC Arc-Fault trips. Setting to Parallel Mode must be approved in advance by CPS and must be performed by a CPS Service Technician. Contact CPS Customer Service for further information. Select the DC conductor size and material for the inverters according to the...
  • Page 50 Y branch connectors are used with DC field wiring to reduce PV source circuit home runs. CPS allows replacement of the factory installed 20A fuses with appropriate ampere ratings, however CPS does not provide nor stock these fuses.
  • Page 51 NOTICE: Note 1: The recommended fuse values are configured based on the condition that the input strings are the same (module type and length). Note 2: The temperature rating of the fuse holder terminals is (90°C). DC Conductor Connection 3.3.3.3 To ensure the optimum performance of the inverter, please read the following guidelines before performing any DC connections.
  • Page 52 Sinofuse. The touch safe fuse holders have unique terminal torque values specified by their manufacturers. See Table 3-6 for specified torque values. Table 3-6 DC Fuse Holder and Busbar Torque Value by Manufacturer Sinofuse TSA1038-S-HR CPS Neg Busbar Single Conductor Specified Single Conductor Specified Torque:...
  • Page 53 WARNING: Failure to apply proper torque to the fuse holder terminals may result in an improper conductor termination and cause excessive heat or fire. DC Connection for RSD Wirebox 3.3.3.5 Using the 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 54 Terminate Pos PV Strings at fuseholders. The RSD wirebox only contains fuseholders for the positive DC conductors. Follow instructions in step 3 for the negative conductors. Strip approximately ½ inch of the cable jacket from the end of the string conductor. Insert the conductor into the fuseholder terminal ensuring the stranding of the conductor remains firmly twisted and does not separate.
  • Page 55 The DC input connection diagrams for SCA25KTL-DO/US-208 inverters are as follows: Figure 3-244 SCA25KTL-208V wiring box NOTICE: To maximize production, reduce clipping losses, and optimize thermal performance, the DC input power should be distributed across all MPPTs as evenly as possible (e.g. difference in number of strings per MPPT not larger than 1).

  • Page 56: Ac And Ground Connection

    AC and Ground Connection The following section describes the AC and ground connections. Acceptable Transformer Configurations 3.3.4.1 The SCA25KTL-DO/US-208 inverters operate at 208V /Wye output. If another voltage/configuration is required a transformer may be necessary. Wye (Inverter) / DELTA (Utility)
  • Page 57 The transformer VA rating should be at least 100% of the sum of the connected inverter VA ratings. 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 58 3.3.4.2 AC and Ground Connection This section includes instructions to connect the AC conductors to the inverter and grounding options. Table 3-10 Tools Required for Cable Termination Tools Remark 5mm flat screwdriver Internal grounding bar #3 Phillips head screwdriver External grounding 14mm hex socket wrench AC terminal block Diagonal pliers or cable cutters...
  • Page 59 Grounding/Bonding. The inverter provides 1 grounding connection on the AC side and one bonding location. These configurations are illustrated below Figure 3-7). (a) Grounding via the ground busbar (left) [1] This is required for grounding the equipment by running the EGC with the ungrounded conductors.
  • Page 60 Table 3-8 Torque and Conductor Specifications Connection Point Conductor Range Torque Value L1/L2/L3/N: #6-3/0AWG (75/90℃ 14.2 N-m AC output terminal block CU/AL) (126 in-lbs） 5.6 N-m Internal grounding bar #6-4 AWG (CU/AL) （50 in-lbs） 5.6 N-m External grounding point #6-4 AWG (CU/AL) （50 in-lbs）...
  • Page 61 INSTRUCTION: The neutral conductor from the inverter to point of interconnection (POI) is optional. The function of the neutral, when used, is to provide a point of reference for measurement purposes that is essentially at ground potential. The neutral conductor is for control or measurement purposes only, and therefore may be sized according to NEC section 705.95(B).
  • Page 62 Selecting a breaker of another size may either result in nuisance tripping or rejection from the AHJ (Authority Having Jurisdiction). Table 3-9 Specification of AC Breaker Selection Inverter Min AC OCPD Max AC OCPD CPS SCA25KTL-DO/US-208 125A...

  • Page 63: Communication Connection

    Communication Connection CPS SCA25KTL-DO/US-208 inverters support industry standard Modbus RS485 communication. 485_GND RS485_B- RS485_A+ 485_GND 12VGND +12V RS485_B- RS485_A+ 12VGND +12V Figure 3-291 Communication Board in the Wire-box...

  • Page 64: Description Of The Communication Board

    Figure 3-302 Communication Connection Interfaces 3.4.2 RS485 Communication CPS recommends the following cable for inverter RS485 communications: UTP CAT5e or (3) 18-22AWG communication cables. It is recommended that industrial grade shielded twisted pair RS485 cable be used in lieu of unshielded twisted pair. Communication cable such as (CAT5e) or Belden 3106A cable for RS485 5 pin connector is preferred.

  • Page 65: Rs485 Network Set-Up

    the cables are terminated to the same 5-pin connector and 3-pin connector. Figure 3-33 shows a single inverter communication connection in (1) and a network configuration in (2). 485_GND 485_GND RS485_B- RS485_B- RS485_A+ RS485_A+ 12VGND 12VGND +12V +12V Figure 3-313 RS485 Connection of Communications Board 3.4.3 RS485 Network Set-up When the inverters are monitored via the RS485 communication, a unique...
  • Page 66 DANGER: Disconnect the inverter from the AC grid and PV modules before removing covers or opening the equipment. Wait at least 5 minutes after disconnecting from the DC and AC sources before servicing or maintaining the inverter. Ensure hazardous high voltage and energy inside the inverter has been discharged prior to servicing.

  • Page 67: Communication Wiring

    3.4.4 Communication Wiring Instructions for wiring the communications of one or a network of inverters: Open the inverter wiring box. Refer to Section 3.3.1 for instructions and torque requirements when replacing cover. Bring the communication cables into the wiring box through the provided knockout holes at the bottom, using similar methods to the AC and DC wiring.

  • Page 68: User Interface

    User Interface This section is intended to orient the user with the inverter interface prior to turning the system on and commissioning. Description of LCD Panel The inverter’s LCD panel consists of the LCD screen, four LED status indicator lights, a buzzer, and four user keys, as shown in Figure 4-1. POWER GRID FAULT...
  • Page 69 Table 4-1 LED Indication Name Status Indication light Working Energized (control panel starts to Light on work) POWER power light Light off Power supply not working Light on In grid-tied power generation state Grid-tied Derated running status (light up 0.5s, operation Flash light off 1.6s)

  • Page 70: Operation State

    Table 4-2 Definition of the Keys Description Definition of function Escape key Back/end/mute Confirm entering the menu/confirm set Enter key value/Switch to parameter setting mode Page up in selection menu/+1 when setting parameters. Press more than 1 second to go to the last number when setting the parameters.

  • Page 71: Interface Types

    Interface Types Users can perform the corresponding operations with the 4 function keys, described in Table 4-2, according to the indications of the LCD display. The LCD screen will display different interfaces based on the operation modes of the inverter. There are four operation modes: Logo interface mode (as shown in Figure 4-2 LOGO Interface), Normal operation and Standby modes (as shown in Figure 4-3 Default Display Interface for Normal Operation), and Fault mode (as shown in Figure 4-4 History Record Interface).
  • Page 72 The inverter will enter Standby mode when the output voltage and power of PV modules do not meet the startup conditions or PV voltage and input power are lower than the set value. The inverter will check automatically whether it meets the startup conditions in this mode until it turns back to normal mode.

  • Page 73: Commissioning

    Commissioning Before powering up the PV system it is important to check the installation for any hazards that may be present. For convenience, a commissioning checklist is included in this manual and can be found in the Appendix. Mechanical Installation check ▪...

  • Page 74: Commissioning Steps

    Commissioning Steps Complete the list above before commissioning the inverter as follows: Turn on the AC circuit breaker. Turn “ON” the external DC switch(s)/circuit breaker(s). Skip these two steps if there are no switches or circuit breakers. Switch the Inverter’s DC Switch to the “ON” position. When the energy supplied by the PV array is sufficient, the LCD screen of inverter will light up.
  • Page 75 Language setting ENGLISH 中文 Figure 5-2 Language Setting Set the grid standard. From the previous menu press ESC to return to the System Parameters menu. If the display had been previously returned to the main menu, follow the steps in (4) to access System Parameters again.
  • Page 76 Grid Connection Rule IEEE1547 CA Rule-21 HECO-HM HECO-ML ISO-NE IEEE1547_2018 Figure 5-3 Set up Grid Standard Setting the Time. From the previous menu, press ESC to return to the System Parameters menu. Select Time and press ENT. Scroll up/down to select the numerical value, then press ENT to go to next option.
  • Page 77 Choose PV Input working mode. The factory default working mode of the DC input connection and MPP Tracker is set for Independent. Contact CPS if parallel mode is required. PV Input Mode Independent Figure 5-5 Independent Mode Setting Neutral Line Setting. From the previous menu, press ESC to return to the System Parameters menu.
  • Page 78 Choosing the communication data. From the previous menu, press ESC to return to the System Parameters menu. Scroll to Communication Setting and press ENT. Select Baud rate and press ENT. The default setting is 9600. Depending on the data acquisition/SCADA system being used, the baud rate may need to be increased or decreased.
  • Page 79 E-T:0.0kWh E-D:0.0kWh PV1:0.0V 0.0A Standby Addr:001 2015-10-22 12：00:00 Figure 5-8 Normal Operation Status 12. If the inverter fails to operate normally, the “FAULT” light will illuminate, and the fault menu will be displayed. Select Current Error and press ENT to access the current faults the inverter has recorded. This information will show on the LCD screen as shown in the Figure 5-9.

  • Page 80: Main Menu And Operation

    Main Menu and Operation LCD screen displays “default indication interface” when the inverter is in operation mode. Press ESC in this interface to escape the default interface and Press ENT to access the main operation interface. The main operation interface is shown in Figure 6-1.
  • Page 81 PV Information Independent PV Input Mode PdcTotal(kW) Vdc(V) Idc(A) P1/4 AC Output L1-N L3-N L2-N V(V) I(A) Main Menu F(Hz) Measurement Data Pac(Kw) P Ref 100.0% Setting PF Ref 1.000 Power On/Off P2/4 Energy History Record E-Today(kWh) Device Information E-Month(kWh) E-Year(kWh) E-Total(kWh) Thdv(L1~L3)

  • Page 82: Setting

    Setting Move the cursor to Setting in the main interface. Press the ENT key to be prompted for the password: “1111” as shown in Figure 6-3. Enter the password number by pressing , selecting the numeral, and pressing the ENT key to input and proceed to the next digit of the password number. Once all four digits are entered, press the ENT key to confirm the password or Press the ESC key to go back to Setting.
  • Page 83 Setting Setting Others Parameters System Parameters Control Command Protection Parameters LVRT/HVRT Setup Power Derating Setup Reactive Power Derating Setup ARC Parameters P1/2 P2/2 Figure 6-4 System Setup Menu and Submenus Overview...

  • Page 84: System Parameters

    6.2.1 System Parameters The System Parameter selection contains nine submenus. Language Setting. Two languages, i.e. Chinese and English are available in Language menu. Language setting ENGLISH 中文 Figure 6-5 Language Setting Grid Connection Rule. Multiple grid standards are available. Press to select the corresponding grid standard required for the installation and press the ENT key.
  • Page 85 PV Input Mode. This allows the user to read the inverter working mode as “Independent" or "Parallel" mode. The inverter is factory set in Independent mode. If this needs to be set to Parallel contact CPS to have this setting changed.

  • Page 86: Control Command

    标题 Figure 6-7 LCD Contrast Grade Setting Clear Running Record. Clear the running information. This contains normal operating information such as when the inverter starts up and shuts down. Clear Fault Record. Clear the fault record for the inverter. The Fault Record can store up to 128 faults.
  • Page 87 INSTRUCTION: Force Restart is effective only when the faults “IntFault0010~0150” in the troubleshooting table occur. The inverter may restore to normal operation automatically if an Alarm or a Protection faults occur. This function will not respond when the inverter is in operation mode and a “FaultOperated”...
  • Page 88 will skip to normal operation interface if the MPPT scanning succeeds or remain on the MPPT Scan menu interface if the scanning fails. The factory default setting for "MPPTScan" is set to Enabled yet can also be set to Disabled. When the MPPT scan function is enabled, the default scan period is every 60 minutes.

  • Page 89: 6.2.3 Protect Parameters

    6.2.3 Protect Parameters This interface is used to display and set the Protect parameters of the AC grid voltage, frequency and recovery, etc, as shown in Figure 6-9. Grid Over Voltage Protection Grid Under Voltage Protection 110.00% 88.00% GridVolMax1 GridVolMin1 Enable Enable VolMaxTripT1(S)
  • Page 90 Table 6-1 Voltage Protection Parameters (IEEE1547-2018, Rule21 and ISO-NE) Grid Voltage Protection Setting Range Description IEEE1547-2018 Rule21 ISO-NE Parameter name (Threshold Value Min Default Max Min Default Max Min Default Max Level 1 Max. grid GridVoltMax1(%) 135 100 135 100 voltage Level 1 Max.
  • Page 91 Table 6-1 Protection Parameters (IEEE1547-2018、Rule21 and ISO-NE ) Cont'd Grid Frequency Protection Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter name Description Min Default Max Min Default Max Min Default Max GridFrqMax1(Hz) Protection threshold 61.2 60.5 61.2 value of Level 1 Max. grid frequency FrqMaxTripT1(S) Trip time of Level 1...
  • Page 92 Table 6-2 Protection Parameters (IEEE1547-2018、Rule21 and ISO-NE ) Cont'd Grid Recovery Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Description name Min Default Max Min Default Max Min Default Recovery Max VoltMax(%) threshold of grid 135 80 voltage protection Recovery Min VoltMin(%) threshold of grid 91.7 100 20...
  • Page 93 The trip time of the Min grid voltage of MinTripT(s) moving average filter Grid Voltage Balance Threshold value of GridVolUnba grid voltage 0.01 10 0.01 0.01 lance imbalance PhaseLoseC The trigger value of 30 0.5 oeff Zig-Zag protection The recovery value PhaseLoseR of Zig-Zag 30 0.5...

  • Page 94: Lvrt/Hvrt Parameters

    6.2.4 LVRT/HVRT Parameters LVRT/HVRT is used to set the LVRT and HVRT parameters. Move the cursor to this item and press the ENT key to set the parameters. There are 7 pages of LVRT/HVRT parameter settings. These can be changed in the menu tree or by the LVRT (Figure 6-11) and HVRT (Figure 6-12) graphs.
  • Page 95 Through Trip Time/S 2 4 6 8 10 12 14 16 18 20 22 Figure 6-11 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 6-12 The HVRT Curve...
  • Page 96 Table 6-4 LVRT Parameters (IEEE1547-2018, Rule21 and ISO-NE ) LVRT Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Description Name Min Default Max Min Default Max Min Default Max Threshold value LVRTVolt (1,2) of Low voltage ride through (1 & 2 point) Time of Level LVRTTime (1,2) Low voltage ride...
  • Page 97 Table 6-5 HVRT Parameters (IEEE1547-2018, Rule21 and ISO-NE ) HVRT Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Description Name Min Default Max Min Default Max Min Default Max Threshold value of HVRTVolt high voltage ride (1,2) through (1 & 2 point) Time of Level high HVRTTime voltage ride through...
  • Page 98 Table 6-6 LVRT and HVRT Parameters (IEEE1547-2018, Rule21 and ISO-NE ) Grid Frequency Protection Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Name Description Min Default Max Min Default Max Min Default Max 0: Disable 1: Enable, no reactive power LVRTModeSetting output 2: Enable, reactive power output...

  • Page 99: Power Derating Setup

    6.2.5 Power Derating Setup “Power Derating Setup” menu is used to set the active power derating parameters including Active Power Derating, Over frequency derating, Low frequency derating, High temperature frequency derating, etc. The parameters are shown in Figure 6-13. Active Power Derating CtrMode 0：disable 100.0%...
  • Page 100 Power vs Grid Frequency：The active power output shall be as defined by the relevant formula below, plus any inertial response to the rate of change of frequency, until frequency returns to within the dead band.(See Figure 6-4) P/W(%) 100% SysFre FreDroop_DbUf(Hz) FreDroop_DbOf(Hz) Freq(Hz)
  • Page 101 Table 6-7 Power Derating Setup Power Derating Setup Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Description Name Min Default Max Min Default Max Min Default Max The control mode of active power CtrMode 0: Disable dispatch 1: Remote dispatch 2: Local control Local electric Percentage(%) dispatch Active...
  • Page 102 Power Derating Setup Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Description Name Min Default Max Min Default Max Min Default Max The dead zone of FreqDroop_DbUf underfrequency 0.036 0.036 (Hz) active power regulation Coefficient of overfrequency FreqDroop_kOf 0.02 0.05 0.1 0.02 0.05 0.1 0.02 0.05...

  • Page 103: Reactive Power Derating Setup

    6.2.6 Reactive Power Derating Setup The Reactive Power Derating menu is used to set the Grid reactive power derating parameters including PF parameters, Qu parameters, etc. The parameters as shown in Error! Reference source not found.. Grid Reactive Power Derating PF vs Grid Voltage 3：PFset CtrMode...
  • Page 104 Table 6-8 Reactive Power Control (IEEE-1547 and Rule21, and ISO-NE) Grid Reactive Power Derating Setting Range IEEE1547-2018 Rule21 ISO-NE Parameter Description Name Min Default Max Min Default Max Min Default Max The control mode of reactive power 0: Disable dispatch mode 1: Remote dispatch CtrMode...
  • Page 105 Note: The PF and Q value can be adjusted by remote software if the “Remote” setting is selected. PFSetValue：Set the PF value. This function changes the reactive power by adjusting the Power Factor. PFpCurve functions：PFp curve mode. Using the curves to set the PFp setpoints (See Figure 6-6).
  • Page 106 Q(%) (QuCurveU2i,QuCurveQ2i) Inductive (QuCurveU1, QuCurveQ1) (QuCurveU1i, U(V) QuCurveQ1i) Capacitive (QuCurveU2,QuCurveQ2) Figure 6-167 Q(U) Curve Mode Error! Reference source not found. lists the parameters for Q(U) Curve modes. Press ENT to start the modes after the parameters are set. Table 6-9 Reactive Power Control (IEEE-1547 and Rule21, and ISO-NE) Grid Reactive Power Derating Setting Range IEEE1547-2018...
  • Page 107 QuCurveQ2i Reactive power of Q(U)Curve point 2i QuCurveTriPow The trigger of er (%) Q(U)Curve QuCurveUndoP The end of ower (%) Q(U)Curve QuCurveVref(% The rated reference voltage of Q(U) curve The rated reference QuCurveVrefT voltage regulation 5000 300 5000 300 5000 ms(s) time of Q(U) curve QuCurveOLRsp...

  • Page 108: Arc Parameters

    Curve point 3 QpCurveRs Response time of of pTms(s) Q(P)Curve 6.2.7 Arc Parameters ARC Parameters is used to enable/disable the ARC function and set the ARC parameters. These settings are only to be changed by CPS personnel with approval from the AHJ.

  • Page 109: Other Parameters

    Setting ARC Bandwith Setting System Parameters Disable ARCEnable Control Command Protection Parameters LVRT/HVRT Setup Power Derating Setup Reactive Power Derating Setup ARC Parameters P1/2 P1/1 Figure 6-179 Arc Parameters Setting 6.2.8 Other Parameters Other Parameters is used to set additional parameters including MPPT scan period, nominal derating step and GFCI, DCI parameters.
  • Page 110 Others Others Others GFCIStaticValue(mA) PVSlowStartStep 10.00% PowerOnDelay(s) Disable Enable ReactivePowerStep 25.00% PVSlowStartPwDelta 5.00% GFCIStaticT(s) eErrSoftStarTms Enable FaultPowerT(C) 95.0 GFCIDynProFactor 100.0% Enable DCIProtection1 eNormSoftStopTms FaultEnvT(C) 83.0 0.50% Enable eNormSoftStartTms DCIProtectionT1(s) 60.00 NormalDeratingStep 100.00% Disable DCIProtection2(mA) DCIProtectionT2(s) 1.00 P1/8 P2/8 P3/8 Others Others Others Setting...
  • Page 111 Table 6-11 Other Parameters Other Parameters Setting Range Parameter Name Description IEEE1547-2018 Rule21 ISO-NE Min Default Max Min Default Max Min Default Max Startup delay PowerOnDelay (s) 1200 1200 1200 time Reactive power ReactivePowerStep 0.01 600 0.01 600 0.01 (%/P) adjustment step Power startup eErrSoftStarTms...
  • Page 112 Other Parameters Setting Range Parameter Name Description IEEE1547-2018 Rule21 ISO-NE Min Default Max Min Default Max Min Default Max The static GFCIStaticT (s) threshold time of 0.20 Leakage current The dynamic trigger coefficient GFCIDynProFactor of Leakage current Maximum DCI DCIProtection1 0.01 0.50 0.01...
  • Page 113 Other Parameters Setting Range Parameter Name Description IEEE1547-2018 Rule21 ISO-NE Min Default Max Min Default Max Min Default Max 1: Enable Island enable/disable Island Protect control 0: Disable 1: Enable Fan detection enable/disable FAN Detect control 0: Disable 1: Enable Operating OperationOverVol overvoltage...
  • Page 114 Other Parameters Setting Range Parameter Name Description IEEE1547-2018 Rule21 ISO-NE Min Default Max Min Default Max Min Default Max DSP anti- backflow Anti reflux(DSP) communication delay LCD anti- backflow Anti reflux(LCD) communication delay Fast Shutdown Enable control RapidShutdownEn 0: Disable 1: Enable Note: Compatibility among the functions Once the grid voltage is lower than LVRT trigger voltage, i.e.

  • Page 115: Power On/Off

    Power ON/OFF 6.3.1 Manual Power ON/OFF Restarting the inverter is required after regulation setting or manual (fault) shut-down. Press ESC or ENT to access the Main Menu. Scroll the curser down to highlight POWER ON/OFF and press ENT to select. Move the cursor to “ON”...

  • Page 116: History Record

    History Record Move the cursor to History Record in the main menu interface. Press ENT to check the history information. There are 3 submenus in the History Record menu: Current Error, Running Record and Fault Record. See Figure 6-21. Current Error Date Time Fault...
  • Page 117 This menu provides the information to identify the version of boards in the inverter, model number, serial number and data logger information. This information may be required when contacting CPS service. WARNING: Please follow the guidelines below before on-grid operation to...

  • Page 118: Start-Up

    Start-Up Automatic start-up: 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. Manual Power ON/OFF: Manual Power ON/OFF is required after regulation setting or manual (fault) shut-down.

  • Page 119: Grid-Tied Power Generation

    “Troubleshooting” table in section 7 to determine the cause of the error. Grid-tied Power Generation The CPS SCA25KTL-DO/US-208 series inverters have an automatic grid-tied power generation process. It will check constantly whether AC power grid meets the conditions for grid-tied power generation, and test whether the PV array has adequate energy.

  • Page 120: Firmware Upgrade

    6.10 Contact CPS Service about upgrading the inverter firmware. The inverter firmware can be upgraded remotely if a CPS FlexOM Gateway is installed. To update the firmware by using the USB flash: Prepare a USB flash drive (Capacity less than 8G) and format the drive to FAT32.
  • Page 121 485_GND RS485_B- RS485_A+ 485_GND 12VGND +12V RS485_B- RS485_A+ 12VGND +12V Figure 6-19 USB Port for Firmware Upgrades Using the password to enter the Setting menu and select Firmware Update. Choose the firmware to be updated (LCD or DSP) and follow the prompts on the screen.
  • Page 122 Firmware Update LCD firmware DSP firmware UPGRADE FIRMWARE OK, PLEASE Main Menu WAIT! Measurement Data Setting Power On/Off History Record Device Information Please Confirm UPGRADE FIRMWARE FAILURE,PLEASE Setting WAIT! System Parameters Control Command Protection Parameters LVRT/HVRT Setup Power Derating Setup Reactive Power Derating Setup ARC Parameters P1/2...

  • Page 123: Fault Shutdown And Troubleshooting

    Fault Shutdown and Troubleshooting If a fault occurs within the system, the inverter will recognize and report via the LED or LCD panel. If this occurs, reference the following section prior to contacting post-sales service. This will ensure the quickest time to resolution possible.

  • Page 124: Lcd Fault And Troubleshooting

    The causes of a fault can be identified based on the faults listed in Table 7-2 through Table 7-7. There are 4 types of fault: alarm, protection, warning and hardware fault. Proper analysis is recommended before contacting CPS Service to ensure your quickest time to resolution.
  • Page 125 Table 7-3 LCD Troubleshooting ALARM Type Error/State Fault Description / Instruction Definition: Prompt detection of abnormal temperature Possible causes: Temperature Sensor socket connecter has poor contact TempSensorErr Temperature Sensor is damaged Recommended solutions: Observe temperature display Switch off external AC disconnect, then back on to reboot the system;...
  • Page 126 Table 7-4 LCD Troubleshooting PROTECTION Type Error/State Fault Description / Instruction Restart inverter by turning both AC and DC switches off. Wait Protect0090 for 1 minute for all energy to discharge and turn both switches (Bus over voltage) If inverter cannot clear fault, replace inverter Raise limit of IDCmax (for example, 400mA) to allow inverter Protect0070 more room to adjust in transient condition to cope with...
  • Page 127 Wait for 1 minute for all energy to discharge and turn both (The sensor fault of switches ON leakage current) If inverter cannot clear fault, contact CPS Service to replace filter board or inverter. Turn DC Switch OFF PVxReverse Open Fuse holders to isolate PV strings...
  • Page 128 Check logic connector to Arc board is secure. Run Arc Fault Test from “Settings” Menu ARC Protect If Alarm re-occurs, contact CPS Service to replace arc board or wiring box Check logic connector to Arc board is secure. Run Arc Fault Test from “Settings” Menu...
  • Page 129 Raise limit of IDCmax (for example, 400mA) to allow inverter more room to adjust in transient condition to Fault0110 cope with imbalance of impedance and voltage (Bus imbalance) between grid phases If after adjustment, alarm still occurs, replace inverter Restart inverter by turning both AC and DC switches Fault0130 OFF.

  • Page 130: 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. Product Maintenance Maintenance is required to ensure the inverter remains in proper condition, prolonging service life and prevent potential issues.
  • Page 131 necessary to replace the external fans. Please refer to Figure 7-1 for replacing the cooling fans. Use a No. 2 Phillips head screwdriver to remove the 10 screws on the fan tray (6 screws on the upper fan tray, and 4 screws on the lower fan tray).
  • Page 132 Figure 8-1 Replacing Cooling Fans...

  • Page 133: Replace 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. 8.1.4 Replace the Inverter Please confirm the following items before replacing the inverter: ▪...
  • Page 134 Use a No. 3 Phillips head screwdriver to unscrew the 2 screws on both sides of the inverter. Figure 8-3 Remove the screws on both sides Use a No. 10 Hex wrench to remove the 4 screws between the inverter and the wiring box.
  • Page 135 Figure 8-4 Disconnect the main housing from the wiring box If the replacement inverter is on hand and to be installed immediately, skip this step and refer to section 3.2 for installation of the inverter. Otherwise, use a No. 2 Phillips head screwdriver to remove the 2 screws on the left side of the wiring box, and remove the bulkhead cover.

  • Page 136: D E - Installing The Inverter

    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. Turn off the external DC breaker and/or disconnect switch, if present, and use lock-out/tag-out procedures.

  • Page 137: Accessories

    Accessories The CPS SCA25KTL-DO/US-208 inverters have several optional accessories that allow the inverter to support a wide range of real-world applications. Shade Cover (SSC-60ST) Figure 9-1 Shade Cover installed on CPS 25kW-208V inverter 9.1.1 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.

  • Page 138: Y-Comb Terminal Block (Optional)

    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. https://www.chintpowersystems.com/downloads/application-notes/PVEL- Field-Testing-Report-28kW-Inveter-Shade-Plate.pdf Y-Comb Terminal Block (Optional) The Y-Comb is intended for use in the SCA25KTL-DO/US-208.

  • Page 139: 10 Technical Data

    10 Technical Data Datasheet 10.1 Model Name CPS SCA 25KTL-DO/US-208 DC Input Max. PV Power 45kW (17kW per MPPT) Max. DC Input Voltage 1000V 200-950V Operating DC Input Voltage Range Start-up DC Input Voltage / Power 330V / 80W Number of MPP Trackers...
  • Page 140 Display and Communication User Interface and Display LCD + LED Inverter Monitoring SunSpec,Modbus RS485 Site Level Monitoring CPS Flex Gateway (1 per 32 inverters) Modbus Data Mapping Remote Diagnostics / FW Standard / with FlexOM Upgrade Functions Mechanical Data Dimensions (HxWxD) 39.4 x 23.6 x 10.24 in.
  • Page 141 Safety UL1741-SA Ed. 2, UL1699B, UL1998, CSA-C22.2 Certifications and Standards NO.107.1-01, IEEE1547, FCC PART15 Selectable Grid Standard IEEE 1547a2014, CA Rule 21, ISO-NE, HECO Volt-RideThru, Freq-RideThru, Ramp-Rate, Specified-PF, Smart-Grid Features Volt-VAr, Freq-Watt, Volt-Watt 1) The "Output Voltage Range" and "Output Frequency Range" may differ according to the specific grid standard. 2) Active Power Derating begins at 45°C when PF=1 and MPPT ≥Vmin and at 50°C when PF=1 and MPPT V ≥...

  • Page 142: 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 143: Production Graphs

    (Pn) will begin to derate, as shown in Figure 10-1: Pin/Pn 100% -3%/℃ Tamb(℃) Figure 10-1 SCA25KTL-DO/US-208 Derating Curve with High Temperature 10.3.2 Altitude Derating Graph When the altitude is higher than 9842.5ft (3000m), the rated output power (Pn) of the inverter will decrease, as shown in Figure 10-2:...

  • Page 144: Grid Voltage Derating Graph

    -30%/km 3000 4000 Altitude(m) Figure 10-2 SCA25KTL-DO/US-208 Derating Curve with High Altitude 10.3.3 Grid Voltage Derating Graph 1) When volt-watt function disable, 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 145: Pv Voltage Derating Graph

    100% 100.0%~110.0% Settable 0.88*Un Grid Voltage (Vac) Figure 10-3-2 SCA25KTL-DO/US-208 Derating Curve of Grid Voltage 10.3.4 PV Voltage Derating Graph When the PV voltage is lower than 480V or higher than 850V, the inverter begins derating. Derating curve of PV input voltage are as...

  • Page 146: Reactive Power Capability

    The Reactive Power Overload function is disabled by factory default (Max. AC Apparent Power is 25kVA and Max. AC Output Current is 69.5A). Contact CPS Customer Service if you want to enable the function. Figure 10-5 SCA25KTL-DO/US Reactive Power Capability...

  • Page 147: 11 Limited Warranty

    11 Limited Warranty The warranty policy of this product is specified in the contract; otherwise, the standard warranty is 10 years. For service, please refer to the CPS America standard warranty policy in place at time of purchase.
  • Page 148 CHINT POWER SYSTEMS AMERICA CO., LTD. Address: 1380 Presidential Drive, Richardson, Texas 75081 Service Hotline: 855-584-7168 Email: AmericaSales@chintpower.com Website: www.chintpowersystem.com SHANGHAI CHINT POWER SYSTEMS CO., LTD. Headquarters: Building 4, No. 3255, Sixian Road, Songjiang District, Shanghai, China Tele: +86 -21 -3779 1222 -866300 Fax: +86 -21 -3779 1222 -866001 This manual is subject to change without prior notification.

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