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Xantrex GT4.0-NA-208 Owner's Manual - Symbols Used

Manual is about: Grid Tie Solar Inverter

Summary of GT4.0-NA-208

  • Page 1

    Grid tie solar inverter xantrex grid tie solar inverter owner’s manual gt5.0-na-240/208 ul-05 gt5.0-na-240/208-pos ul-05 gt4.0n-na-240/208 ul-05 gt4.0-na-240/208 ul-05 gt4.0-na-240/208-pos ul-05 gt3.3n-na-240/208 ul-05 gt3.3-na-240/208 ul-05 gt3.3-na-240/208-pos ul-05 gt2.8-na-240/208 ul-05 gt2.8-na...

  • Page 3: Owner’S Manual

    Xantrex grid tie solar inverter owner’s manual.

  • Page 4

    About xantrex xantrex technology inc. Is a world-leading supplier of advanced power electronics and controls with products from 50 watt mobile units to one mw utility-scale systems for wind, solar, batteries, fuel cells, microturbines, and backup power applications in both grid-connected and stand-a...

  • Page 5: About This Manual

    975-0334-01-01 iii about this manual the purpose of this owner’s manual is to provideexplanations and procedures for installing, operating, maintaining, and troubleshooting the xantrex grid tie solar inverter™. Scope the manual provides safety guidelines, detailed planning and setup information. It ...

  • Page 6: Conventions Used

    About this manual iv 975-0334-01-01 conventions used the following conventions are used in this guide. Abbreviations and acronyms warning warnings identify conditions that could result in personal injury or loss of life. Caution cautions identify conditions or practices that could result in damage t...

  • Page 7: Symbols Used

    About this manual 975-0334-01-01 v symbols used related information you can find more information about xantrex technology inc. As well as its products and services at www.Xantrex.Com. Ground in this guide: important information, warnings, or cautions. On the product: important information, warnings...

  • Page 8

    Vi.

  • Page 9

    975-0334-01-01 vii important safety instructions save these instructions—this manual contains important instructions that shall be followed during the installation and maintenance of the xantrex grid tie solar inverter. 1. Before installing and using the gt inverter, read all instructions and cautio...

  • Page 10: Fcc Information to The User

    Safety viii 975-0334-01-01 location of safety and data labels the figure below shows the location of the safety label and the data label with model, serial number and part number information. Fcc information to the user this equipment has been tested and found to comply with the limits for a class b...

  • Page 11: Contents

    975-0334-01-01 ix important safety instructions - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - vii location of safety and data labels - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - viii fcc information to the user - - - - - - - - - - - - - - - - ...

  • Page 12

    Contents x 975-0334-01-01 4 starting the inverter startup procedure - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–1 checking the pv array dc voltage - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 4–2 check...

  • Page 13

    Contents 975-0334-01-01 xi user display- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - a–11 display accuracy - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -a–11 mechanical specificat...

  • Page 14

    Xii.

  • Page 15: Introduction

    1 introduction chapter 1 contains information about the features and functions of the xantrex grid tie solar inverter. About the xantrex grid tie solar inverter the xantrex grid tie solar inverter (gt inverter) is designed to convert solar electric (photovoltaic or pv) power into utility-grade elect...

  • Page 16

    Introduction 1–2 975-0334-01-01 pv compatibility the gt inverter is designed to take advantage of solar modules configured as high voltage pv string arrays—single crystalline, poly crystalline, or thin film—with an input voltage maximum power point range (depending on inverter model) of 195 to 550 v...

  • Page 17

    About the xantrex grid tie solar inverter 975-0334-01-01 1–3 the wiring/disconnect box has been designed to be physically mated to the electronics section of the gt inverter at the factory, but remains in place as a non-serviceable item in the event that the inverter electronics section is ever requ...

  • Page 18

    Introduction 1–4 975-0334-01-01 wiring/disconnect box the wiring/disconnect box is standard for all north american models of the gt inverter. The wiring/disconnect box provides a location for making ac, dc and ground connections. It also contains the dc/ac (pv array/utility) disconnect switch. When ...

  • Page 19: Installation

    2 installation chapter 2 provides information about installing the gt inverter. It contains information on determining a suitable location for installation, pv array requirements, and procedures for mounting the unit. Installation options the gt inverter may be installed as a single inverter for a s...

  • Page 20

    Installation 2–2 975-0334-01-01 inverter failure due to improper installation will void the inverter warranty. Consider the following when determining where to install the inverter. Indoor/ outdoor • the gt inverter uses a type 3r-rated enclosure (vertical mount only) that can be mounted indoors or ...

  • Page 21

    Planning the installation 975-0334-01-01 2–3 pv array voltage and mppt requirements mppt operational window the mppt software maximizes the output energy of solar arrays as long as the operating voltage is within the mppt operational window of the inverter. Ensure that the open circuit voltage (v oc...

  • Page 22: Mounting The Inverter

    Installation 2–4 975-0334-01-01 the short circuit current (i sc ) rating of the array at any temperature must not exceed the i sc rating of the inverter. For maximum solar energy harvest, it is recommended that the effective power output of the array be matched with the input power capacity of the i...

  • Page 23

    Mounting the inverter 975-0334-01-01 2–5 figure 2-1 gt inverter dimensions and knockout locations 27 mm (1") conduit holes with threaded caps, both sides dual 35 mm or 27 mm (1 3/8 " or 1") knockouts 137 (5 3/8 ) 110 (4 5/16 ) 403 (15 7/8 ) 550 (21 5/8 ) 699 (27 1/2 ) 726 (28 9/16 ) 52 (2) 62 (2 7/1...

  • Page 24

    Installation 2–6 975-0334-01-01 installing the mounting bracket secure the mounting bracket to a vertical structure or surface. The gt inverter mounting hooks attach to the flanges on the mounting bracket. Mounting bracket dimensions are shown in figure 2-2. If mounting more than one inverter, insta...

  • Page 25

    Mounting the inverter 975-0334-01-01 2–7 clearance requirements for optimal and safe operation, ensure there is adequate clearance around the inverter. If the minimum clearances in table 2-2 are not met, rated power may not be achieved. Surfaces for mounting the gt inverter can be mounted to a verti...

  • Page 26

    Installation 2–8 975-0334-01-01 mounting the inverter on the bracket place the inverter’s mounting hooks over the flanges on the bracket. Ensure the inverter is seated properly, then secure the bottom of the inverter with appropriate screws or anchors through the mounting slots. Figure 2-3 placing t...

  • Page 27: Wiring The Inverter

    3 wiring the inverter chapter 3 provides information about dc and ac wiring, and grounding the gt inverter and the pv array. This chapter does not provide sufficient information for anyone but a qualified installer to install this product. Installers should be electricians or technicians fully educa...

  • Page 28

    Wiring the inverter 3–2 975-0334-01-01 the ground bar accepts wires up to #4 awg. Use wire size #12 to #4 awg, copper conductors only, rated 90 °c minimum. Torque ground wires as specified in table 3-1. Figure 3-1 ground conductor knockouts knockouts for ground conductors ground bar table 3-1 torque...

  • Page 29

    Grounding requirements 975-0334-01-01 3–3 ground fault fuse the gt inverter is equipped with a 600 volt, 1 amp ground fault protection fuse (replace with littelfuse klkd 1 or equivalent). Figure 3-2 grounding diagram l1 l2 n g l 1 l 2 neutral l1 l2 ground pv1 string #1 pv1 string #2 pv1 string #3 (g...

  • Page 30: Wiring Requirements

    Wiring the inverter 3–4 975-0334-01-01 wiring requirements use wire size #12 to #6 awg, copper conductors only, rated 90 °c minimum. Strip all wires 9 mm (3/8 inch) and torque to a maximum 16 in-lb (1.8 nm). For safety and compliance with the nec, run ac, dc, and communication wires in separate cond...

  • Page 31

    Accessing the wiring terminals 975-0334-01-01 3–5 accessing the wiring terminals you must remove the gt inverter wiring box cover to access the terminal blocks, ground bar and communications ports. To remove the wiring box cover: • using a phillips screwdriver, remove the two screws on the bottom si...

  • Page 32

    Wiring the inverter 3–6 975-0334-01-01 figure 3-4 insulating barrier location figure 3-5 ac and dc terminal block location lift bottom edge of barrier to access wiring terminals. (gnd) (neut) (ac l1) (ac l2) (pv+) (pv-) l1 l2 n g gt5.0 gt4.0, gt3.3, gt2.8.

  • Page 33: Connecting The Dc Wiring

    Connecting the dc wiring 975-0334-01-01 3–7 connecting the dc wiring the following procedure is illustrated in figure 3-7. If there is more than one pv string, label the positive and negative wire pairs appropriately (for example: pv1-string #1 pos, pv1-string #1 neg, pv1-string #1 gnd, pv1-string #...

  • Page 34

    Wiring the inverter 3–8 975-0334-01-01 figure 3-7 dc connections for multiple pv strings important: depending upon installation and local codes, fusing and/or a combiner box may be required. This fusing and combiner box are to be provided by the installer. Important: a dc grounding electrode conduct...

  • Page 35

    Connecting the dc wiring 975-0334-01-01 3–9 dc wiring for multiple inverters for installations with multiple gt inverters, separate solar arrays are required for each unit. The output of each gt inverter feeds a separate dual-pole circuit breaker (l1 and l2) in the main utility service panel. For su...

  • Page 36: Connecting The Ac Wiring

    Wiring the inverter 3–10 975-0334-01-01 connecting the ac wiring the gt inverter can be connected to a single bi-directional meter, or to dual meters, where one meter indicates power used and the second meter indicates power sold (power supplied back to the utility). Consult the local utility to det...

  • Page 37

    Dc and ac wiring for multiple inverters 975-0334-01-01 3–11 dc and ac wiring for multiple inverters dc and ac wiring for multiple inverters is illustrated in figure 3-10. If there will be more than one pv array, label the positive and negative wire pairs appropriately (for example: pv1 pos, pv1 neg,...

  • Page 38

    Wiring the inverter 3–12 975-0334-01-01 communications wiring for multiple inverters communications wiring between multiple gt inverters allows information about each inverter and its associated pv array to be communicated between all of the inverters in the system. Information about the entire syst...

  • Page 39

    Communications wiring for multiple inverters 975-0334-01-01 3–13 terminators the network terminator supplied with each gt inverter (figure 3-12) is required at each end of the network to ensure the communication signal quality on the network. Xanbus ports two rj-45 ports are provided in the gt inver...

  • Page 40

    Wiring the inverter 3–14 975-0334-01-01 purchasing network components consult your system designer to determine what network components will be needed for your specific installation. Table 3-3 provides a partial list of network components and part numbers. Pre-made cables are available in standard l...

  • Page 41

    Communications wiring for multiple inverters 975-0334-01-01 3–15 guidelines for routing the network cables connecting network cable between multiple inverters the following procedure is illustrated in figure 3-11. The procedure assumes only two inverters are connected. However, up to five inverters ...

  • Page 42

    Wiring the inverter 3–16 975-0334-01-01 rs-232 cable requirements to connect your computer to the gt inverter, you must use a serial db9 “straight through” cable. The rs-232 connector on the gt is configured as follows: • pin 2: transmit • pin 3: received • pin 5: ground. All other pins are unused. ...

  • Page 43: Starting The Inverter

    4 starting the inverter chapter 4 contains information on starting up the xantrex grid tie solar inverter and performing a functional test. The topics in this chapter are organized as follows: • “startup procedure” on page 4–1 • “commissioning multiple inverters” on page 4–3 • “disconnect test” on p...

  • Page 44

    Starting the inverter 4–2 975-0334-01-01 checking the pv array dc voltage to check the pv array dc voltage: 1. Uncover the pv arrays and expose them to full sunlight. The sunlight must be intense enough to produce the required output voltage. 2. Measure the pv array open circuit dc voltage across th...

  • Page 45

    Commissioning multiple inverters 975-0334-01-01 4–3 to replace the wiring/disconnect box cover: 1. Ensure the clear plastic insulating barrier is properly positioned in the wiring box. 2. Place the cover in position on the wiring box, being careful not to pinch any wires inside. 3. Ensure that the t...

  • Page 46

    Starting the inverter 4–4 975-0334-01-01 to commission multiple inverters: 1. Uncover the pv arrays and/or close the main dc disconnect switch, if one is installed. 2. Start the first inverter by turning the dc/ac disconnect switch to the on position. 3. Wait for the input current to rise above 1 a....

  • Page 47: Disconnect Test

    Disconnect test 975-0334-01-01 4–5 disconnect test the disconnect test is designed to verify correct operation of the gt inverter both on initial operation and periodically through its life as required by the utilities. This test ensures that the xantrex grid tie solar inverter does not send electri...

  • Page 48

    4–6.

  • Page 49: Monitoring The

    5 monitoring the inverter chapter 5 contains information for understanding the lcd screens and the led indicators. Monitoring the front panel display during startup during startup, the inverter’s front panel lcd (see figure 5-1) shows the screens described in table 5-1, “startup screens on gt invert...

  • Page 50

    Monitoring the inverter 5–2 975-0334-01-01 viewing more information additional screens of information about the performance of the gt inverter can be displayed by tapping the inverter front panel. This causes the lcd to cycle through a series of information screens in normal operation, offline or fa...

  • Page 51

    Front panel display screens and what they mean 975-0334-01-01 5–3 the protection timer begins counting down the reconnect delay during startup and the “reconnecting in sss seconds” screen appears until the timer countdown is complete. Vph= 130v clr t 3 seconds vph: phase-to-neutral (rms) high thresh...

  • Page 52

    Monitoring the inverter 5–4 975-0334-01-01 normal operation mode the lcd on the gt inverter is refreshed every two seconds, so all readings are current to within two seconds. There is a default display available at all times, and a series of additional screens that can be displayed by tapping the in...

  • Page 53

    Front panel display screens and what they mean 975-0334-01-01 5–5 additional screens for multiple units in addition to the normal system message screens, additional screens specific to each gt inverter unit can be displayed when the unit is networked to other gt inverters. These screens are only ava...

  • Page 54

    Monitoring the inverter 5–6 975-0334-01-01 offline mode offline default display at night and when no power is being produced by the pv array (offline mode), the gt inverter displays the screen shown in table 5-5. Offline messages for all systems additional message screens can be viewed when the syst...

  • Page 55

    Front panel display screens and what they mean 975-0334-01-01 5–7 additional offline messages for multiple unit systems multiple unit systems in offline mode display all of the message screens shown in table 5-6, plus the additional screens shown in table 5-7. These additional screens are displayed ...

  • Page 56

    Monitoring the inverter 5–8 975-0334-01-01 fault mode when a fault state is detected, the appropriate fault message appears on the front panel display at the next screen refresh (within 2 seconds). The gt inverter fault message screens are shown in table 5-8. The numbers used in table 5-8 are exampl...

  • Page 57

    Front panel display screens and what they mean 975-0334-01-01 5–9 additional fault messages for all systems additional message screens can be viewed in fault mode by tapping the inverter front panel. Each additional tap displays the next screen in the order shown in table 5-9. Protection up not resp...

  • Page 58

    Monitoring the inverter 5–10 975-0334-01-01 special screens special message screens are displayed in specific situations that are not considered fault situations. They can appear in any mode of operation. These screens are described in table 5-10. Custom screens two custom screens are available. The...

  • Page 59: Status Indicator Lights

    Status indicator lights 975-0334-01-01 5–11 status indicator lights the gt inverter has two status indicator lights (leds) located below the front panel lcd (figure 5-2). These leds indicate the inverter’s status (table 5-11) and assist in troubleshooting the performance of the unit. Only one indica...

  • Page 60

    5–12.

  • Page 61: Maintenance and

    6 maintenance and troubleshooting chapter 6 contains information about how to provide general maintenance for the xantrex grid tie solar inverter. It also provides information about troubleshooting the unit. The topics in this chapter are organized as follows: • “factors affecting gt inverter perfor...

  • Page 62

    Maintenance and troubleshooting 6–2 975-0334-01-01 angle of the sun the angle of the sun in relation to the pv array surface—the array orientation—can dramatically affect the pv array output. The array energy output will vary depending on the time of day and time of year as the sun’s angle in relati...

  • Page 63: Replacing Parts

    Performing general maintenance 975-0334-01-01 6–3 performing general maintenance follow these simple routines to ensure many years of service and optimal performance of your solar energy system. 1. Keep the heat sink clear of dust and debris. 2. Clean the pv array, during the cool part of the day, w...

  • Page 64

    Maintenance and troubleshooting 6–4 975-0334-01-01 replacing the ground fault protection fuse the ground fault protection fuse will blow when severe leakage occurs between the pv array and earth ground, or when the system has been installed with faulty wiring. Before replacing the fuse, it is import...

  • Page 65

    Replacing parts 975-0334-01-01 6–5 figure 6-1 location of fuse, front panel cover removed figure 6-2 display front panel assembly ground fault protection fuse location (“-pos” models) ac overcurrent protection fuse ground fault protection fuse lcd.

  • Page 66

    Maintenance and troubleshooting 6–6 975-0334-01-01 replacing the inverter if your gt inverter requires servicing, you can replace it with another inverter, leaving the existing wiring box in place. This means that you do not have to disturb wiring connections in the wiring/disconnect box. However, y...

  • Page 67

    Replacing parts 975-0334-01-01 6–7 3. Using an insulated screwdriver, disconnect the pv negative (–) wire from the terminal block inside the inverter. Cap the wire immediately with a wire nut. 4. Disconnect the remaining ac, dc and network cables between the inverter and the wiring box, inside the i...

  • Page 68

    Maintenance and troubleshooting 6–8 975-0334-01-01 to replace the inverter on the wiring box: 1. If it has not already been removed, remove the display front panel cover on the inverter. 2. Mount the inverter on the upper mounting bracket above the wiring/disconnect box, ensuring that the inverter’s...

  • Page 69

    Identifying error/fault conditions and solutions 975-0334-01-01 6–9 identifying error/fault conditions and solutions most error or fault conditions will be identified by fault message screens on the gt inverter front panel lcd. These are described in the “fault mode” section on page 5–8 of this manu...

  • Page 70

    6–10

  • Page 71: Specifications

    A specifications appendix a contains information about the specifications of the xantrex grid tie solar inverter. The topics in this appendix are organized as follows: • “electrical specifications” on page a–2 • “output power versus ambient temperature” on page a–11 • “environmental specifications” ...

  • Page 72: Electrical Specifications

    Specifications a–2 975-0334-01-01 electrical specifications gt5.0 input output gt5.0-na-240/208 ul-05 gt5.0-na-240/208-pos ul-05 model number 864-1009 864-1011 input voltage, maximum power point range certified operating range: 240–550 vdc. (unit is operable as low as 235 vdc.) absolute maximum arra...

  • Page 73

    Electrical specifications 975-0334-01-01 a–3 efficiency 240 v 208 v maximum efficiency 95.9% 95.5% cec efficiency 95.5% 95.0% night-time tare loss 1 w figure a-1 gt5.0 typical efficiency 5kw efficiency vs output power 90 91 92 93 94 95 96 97 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% % of rated out...

  • Page 74

    Specifications a–4 975-0334-01-01 gt4.0 input output gt4.0n-na-240/208 ul-05 gt4.0-na-240/208 ul-05 gt4.0-na-240/208-pos ul-05 model number 864-1008 864-1007 864-1010 input voltage, maximum power point range certified operating range: 240–480 vdc. (unit is operable as low as 235 vdc and as high as 5...

  • Page 75

    Electrical specifications 975-0334-01-01 a–5 efficiency gt4.0n-na-240/208 ul-05 gt4.0-na-240/208 ul-05 gt4.0-na-240/208-pos ul-05 output voltage 240 v 208 v 240 v 208 v maximum efficiency 96% 95.7% 95.9% 95.6% cec efficiency 95.5% 95% 95% 95% night-time tare loss 1 w figure a-2 gt4.0n typical effici...

  • Page 76

    Specifications a–6 975-0334-01-01 gt3.3 input output gt3.3n-na-240/208 ul-05 gt3.3-na-240/208 ul-05 gt3.3-na-240/208-pos ul-05 model number 864-1006 864-1004 864-1005 input voltage, maximum power point range certified operating range: 200–400 vdc. (unit is operable as high as 550 vdc.) certified ope...

  • Page 77

    Electrical specifications 975-0334-01-01 a–7 efficiency gt3.3n-na-240/208 ul-05 gt3.3-na-240/208 ul-05 gt3.3-na-240/208-pos ul-05 output voltage 240 v 208 v 240 v 208 v maximum efficiency 95.9% 95.6% 95.8% 95.6% cec efficiency 95.5% 95% 95% 95% night-time tare loss 1 w figure a-4 gt3.3n typical effi...

  • Page 78

    Specifications a–8 975-0334-01-01 gt2.8 input output gt2.8-na-240/208 ul-05 gt2.8-na-240/208-pos ul-05 model number 864-1001 864-1002 input voltage, maximum power point range certified operating range: 195–550 vdc. (unit is operable as low as 193 vdc.) absolute maximum array open circuit voltage 600...

  • Page 79

    Electrical specifications 975-0334-01-01 a–9 efficiency 240 v 208 v maximum efficiency 95% 94.6% cec efficiency 94% 93.5% night-time tare loss 1 w figure a-6 gt 2.8 typical efficiency 2.8 kw efficiency vs output power 84 86 88 90 92 94 96 0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100% % of rated output...

  • Page 80

    Specifications a–10 975-0334-01-01 adjustable voltage, frequency and reconnection settings utility disconnect settings can be adjusted using the gtconfiglite software tool. Permission of the utility must be granted before adjusting any of these settings. For more information about installing and usi...

  • Page 81: Environmental Specifications

    Output power versus ambient temperature 975-0334-01-01 a–11 output power versus ambient temperature once the heat sink on the inverter reaches a maximum temperature limit, the gt inverter reduces its energy output to ensure component ratings are not exceeded. Environmental specifications user displa...

  • Page 82: Mechanical Specifications

    Specifications a–12 975-0334-01-01 mechanical specifications regulatory approvals the gt inverter has complete on-board over-current, over-temperature and anti-islanding protection, and meets u.S., canadian and international safety operating standards and code requirements: • ul 1741 1st edition 200...

  • Page 83: Warranty

    975-0334-01-01 wa–1 warranty and return information warranty what does this warranty cover? This limited warranty is provided by xantrex technology inc. ("xantrex") and covers defects in workmanship and materials in your xantrex grid tie solar inverter. This warranty period lasts for 10 years from t...

  • Page 84: Disclaimer

    Warranty and return wa–2 975-0334-01-01 what does this warranty not cover? This limited warranty does not cover normal wear and tear of the product or costs related to the removal, installation, or troubleshooting of the customer's electrical systems. This warranty does not apply to and xantrex will...

  • Page 85: Return Procedure

    Warranty and return 975-0334-01-01 wa–3 return material authorization policy before returning a product directly to xantrex you must obtain a return material authorization (rma) number and the correct factory "ship to" address. Products must also be shipped prepaid. Product shipments will be refused...

  • Page 86

    Warranty and return wa–4 975-0334-01-01 information about your system as soon as you open your xantrex grid tie solar inverter package, record the following information and be sure to keep your proof of purchase. If you need to contact customer service, please record the following details before cal...

  • Page 87: Index

    975-0334-01-01 ix-1 a abbreviations and acronyms iv ac circuit breaker requirements 3–4 ac grounding requirements 3–1 ac output voltage ratings a–2, a–4, a–6, a–8 ac wiring instructions 3–10 acceptable wire sizes a–12 accessing ac and dc terminals 3–5 adjusting utility disconnect settings a–10 c che...

  • Page 88

    Index ix–2 975-0334-01-01 ac and dc wiring 3–11 communication between 3–12 communications wiring 3–15 configuration 2–1 messages in normal operation 5–5 messages in offline mode 5–7 o operation factors affecting performance 6–1 inverter startup 4–3 messages at startup 5–2 reassembling the unit 4–2 s...

  • Page 90

    Xantrex technology inc. 1 800 670 0707 tel toll free na 1 360 925 5097 tel direct 1 360 925 5143 fax direct customerservice@xantrex.Com www.Xantrex.Com 975-0334-01-01 printed in china.