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ITech IT7900EP Series User Manual

Programmable ac power supply
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Programmable AC Power
Supply
IT7900EP Series User Manual
Model: IT7900EP
Version: V1.0/2024.01

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Summary of Contents for ITech IT7900EP Series

  • Page 1 Programmable AC Power Supply IT7900EP Series User Manual Model: IT7900EP Version: V1.0/2024.01...
  • Page 2 Notices Warranty Safety Notices © Itech Electronic, Co., Ltd. 2024 The materials contained in this No part of this manual may be document are provided “as is”, and reproduced in any form or by any is subject to change, without prior means ( including electronic storage notice, in future editions.

  • Page 3: Quality Certification And Assurance

    Warranty ITECH warrants that the product will be free from defects in material and workmanship under normal use for a period of one ( 1) year from the date of delivery ( except those described in the Limitation of Warranty below).

  • Page 4: Safety Precautions

    Failure to comply with these precautions or specific warnings elsewhere in this manual will constitute a default under safety standards of design, manufacture and intended use of the instrument. ITECH assumes no liability for the customer’s failure to comply with these precautions.

  • Page 5: Environmental Conditions

    Operating humidity 20%～80%( non-condensation) Storage temperature -10°C～70 °C Altitude Operating up to 2,000 meters Installation category Pollution degree Pollution degree 2 Note To make accurate measurements, allow the instrument to warm up for 30 min. Copyright ©ITECH Electronic Co., Ltd.

  • Page 6: Regulatory Markings

    With reference to the equipment classifications described in the Annex 1 of the WEEE Directive, this instrument is classified as a “Monitoring and Control Instrument”. To return this unwanted instrument, contact your nearest ITECH office. Copyright ©ITECH Electronic Co., Ltd.

  • Page 7: Compliance Information

    2. Connection of the instrument to a test object may produce radiations beyond the specified limit. 3. Use high-performance shielded interface cable to ensure conformity with the EMC standards listed above. Safety Standard IEC 61010-1:2010/ EN 61010-1:2010 Copyright ©ITECH Electronic Co., Ltd.

  • Page 8: Table Of Contents

    5.6 Professional Anti-islanding Test Mode ....................... 45 5.7 Waveform Selection ............................46 5.8 Full 4-Quadrant Power Amplifier ........................47 5.9 Auto-range Function ............................47 5.10 Programmable Output Impedance ........................48 5.11 Sweep Function ..............................48 Copyright ©ITECH Electronic Co., Ltd.
  • Page 9 7.1.1 Menu function ........................... 104 7.1.2 Set the communication interface ....................106 7.1.3 View the System Information ....................106 7.2 Configuration Menu Reference ........................106 7.2.1 Balance Control Setting ......................108 7.2.2 Dimming Function(For Source mode) ..................108 Copyright ©ITECH Electronic Co., Ltd.
  • Page 10 10.4 GPIB Interface (Optional) ..........................166 10.5 RS–232 Interface (Optional) ........................... 167 10.6 Commonly Used Commands Overview ......................168 10.7 Demo Software Introduction ......................... 169 Appendix ................................170 Specifications of Red and Black Test Lines ......................170 Copyright ©ITECH Electronic Co., Ltd.

  • Page 11: Chapter1 Overview

    Chapter1 Overview This chapter introduces the front panel, the rear panel, key functions and LCD display function of the IT7900EP series power supply, make sure that you can quickly know the appearance, instruction and the key function before you operate the power supply. Help you make better use of this series of power supply.

  • Page 12: Source Mode

    Voltage/current harmonic analysis, voltage harmonic simulation in source mode, current harmonic simulation in load mode, fundamental wave≤60Hz After the rectification function is turned on, the setting range of the phase shift is restricted by the crest factor Copyright ©ITECH Electronic Co., Ltd.

  • Page 13: Models And Options

    The IT7900EP series supports the following optional accessories (sold separately), the details are as below: The interface expansion slot provided on the rear panel of the IT7900EP series instrument allows users to flexibly expand according to their needs. Different interface cards can be selected to achieve different functions.

  • Page 14: Instrument Size Introduction

    1.4 Instrument Size Introduction The instrument should be installed at well-ventilated and rational-sized space. Please select appropriate space for installation based on the power supply size. IT7921P-350-105 Model Copyright ©ITECH Electronic Co., Ltd.
  • Page 15 Overview IT7942P-350-210 Model Copyright ©ITECH Electronic Co., Ltd.
  • Page 16 Overview IT7963EP-350-315 Model Copyright ©ITECH Electronic Co., Ltd.
  • Page 17 Overview IT7984P-350-420/IT79105P-350-525/IT79126P-350-630 Model Copyright ©ITECH Electronic Co., Ltd.

  • Page 18: Chapter2 Instrument Introduction

     It is not advisable to push down the slope to prevent the cabinet from falling down due to the shift of the center of gravity. It is rec- ommended Copyright ©ITECH Electronic Co., Ltd.

  • Page 19: Verifying The Shipment

     ITECH 27U and 37U cabinets are equipped with hoisting rings as standard on the top. It is recommended to use a crane equipped with a four-leg hoisting belt structure for horizontal hoisting and moving, and ensure that the four hoisting belts are the same length to avoid cabinet skew during movement.

  • Page 20: Front Panel

    5 Number key 6 Up, down, left and right key and enter key 7 Rotary knob 8 Vent hole 2.4 Keyboard The keyboard introduction of IT7900EP series Power Supply is shown as follows. Keys Description Print Used for saving screen images...
  • Page 21 Enter the Surge and Sag menu, used to Set the Surge/trapped Configuration. [Shift]+ (Surge&Sag) Enter the standard wave selection interface. [Shift]+ (Standard) [Shift]+[1](Log) Enter the data logging function menu. [Shift]+ [2] (Lock) Turn the keyboard lock on or off. Copyright ©ITECH Electronic Co., Ltd.

  • Page 22: Push-On Knob

    [Shift]+ [7] (Help) Obtain the help information. 2.5 Push-on Knob The IT7900EP series Power Supply provides a knob on the front panel as shown in the next figure. The functions of the posh-on knob is described as follows. ...

  • Page 23: Rear Panel

    Instrument Introduction 2.6 Rear Panel The rear panel of the IT7900EP series 3U model is shown below. Name Description ground terminal Ground screw for making chassis ground connections. Output terminals AC or DC output terminals and chassis ground terminals, used to connect DUT.
  • Page 24 Instrument Introduction The rear panel of IT7900EP series 15U and above series cabinets are the same. Take IT7963EP-350-315 as an example, the rear panel is introduced as shown below. 1: Output socket, which can be used when users need single-phase lower than...

  • Page 25: Chapter3 Installation

    Connecting the power cord The standard power cord specifications for this series of 3U instruments are divided into the following types according to different regions: Copyright ©ITECH Electronic Co., Ltd.
  • Page 26 2. Confirm that the power switch is in the OFF position and verify that there is no dangerous voltage on the connection terminals. 3. Connect one end of the power cable’s round terminal to the AC power input terminal on the instrument’s rear panel. Copyright ©ITECH Electronic Co., Ltd.

  • Page 27: Connecting Test Lines ( Optional)

     Always use test lines provided by ITECH to connect the equipment. If test lines from other factories are used, please check that the test line can withstand maximum current.
  • Page 28 When used as a three-phase power output, the Y connection mode is used as an example, The connection diagram is shown as follow: When Delta connection mode is selected in the system menu, the N wire does not need to be connected. Copyright ©ITECH Electronic Co., Ltd.
  • Page 29 When the power system is used for battery testing in actual applications, the voltage drop of the wire will lead to voltage inconsistency of both ends and inconsistency of the cutoff voltage of power system and the actual voltage of battery, resulting in inaccurate measurement. Copyright ©ITECH Electronic Co., Ltd.
  • Page 30 N terminal of the IT7900P does not need to be connected to the object, but the N line of the Sense terminal needs to be connected to the N terminal of the output terminal. Copyright ©ITECH Electronic Co., Ltd.

  • Page 31: Installing Fiber Cables (Only For It7942Ep-350-210)

    After receiving the instrument, users need to install the yellow fiber cable by themselves. Copyright ©ITECH Electronic Co., Ltd.
  • Page 32 Fiber optic cables cannot be flexed or folded. When the cable is too long and needs to be arranged, gently wrap the cable in a circle and gently tie it. As shown in the following figure, connect the System Bus between the master and slave by fiber cords. Copyright ©ITECH Electronic Co., Ltd.

  • Page 33: Chapter4 Getting Started

    The disconnect device must be close to the equipment, be easily accessible, and be marked as the disconnect device for this equipment. Copyright ©ITECH Electronic Co., Ltd.

  • Page 34: Turning The Power Switch On

    User can adjust the power switch directly to turn on or turn off the instrument. The status of Power switch is as follows. The switching knob of the IT7900EP series power supply allows the user to turn the power on by 90° clockwise or to turn the power off by 90° counterclockwise.
  • Page 35 Getting Started Single Phase Mode The meter interface of IT7900EP series power supply is shown as follow. Status bar Voltage setting&meter value Frequency setting&meter value Display area of measuring data Three Phase Mode The meter interface of IT7900EP three phase mode is shown as follow.

  • Page 36: Introduction To Interface Symbols

    Multi-channel AC+DC Multi-channel AC mode mode Multi-channel DC+AC Multi-channel DC mode mode Surge&Sag function The AC source is in indicator remote mode External Simulation Test Record log Function LIST is running LIST is finished Copyright ©ITECH Electronic Co., Ltd.

  • Page 37: Menu Introduction

    Touch screen drag and corresponding functions are described as below. Convenient user quickly understand how to use this power supply. Copyright ©ITECH Electronic Co., Ltd.

  • Page 38: Set Output Parameters

    If the [On/Off] key light is on, indicates that the output is turned on. The VFD displays the meter value such as voltage, current, power and so on. If the [On/Off] key light is off, indicates that the output is turned off. The VFD Copyright ©ITECH Electronic Co., Ltd.
  • Page 39 Getting Started displays that the power supply state is OFF. Copyright ©ITECH Electronic Co., Ltd.

  • Page 40: Chapter5 Voltage Source Mode Operation

    Source mode. 5.1 full 4-Quadrant output character The IT7900EP series represent the newest generation of programmable, full four-quadrant grid simulators with full 100% of current rating in both source and sink mode, and provides energy recovery capability. The power generated by the DUT during the test can be easily retuned to the AC grid, rather than being dissipated as heat.

  • Page 41: Select The Power Supply Mode

    5.3 Select the Output Mode The IT7900EP series has four output modes: AC, DC, AC+DC, DC+AC. It not only provides pure AC/DC output, but also can use AC+DC and DC+AC output modes to realize "AC output plus DC bias" And "DC output waveform with ripple", which cover a wider range of applications.

  • Page 42: Ac Output Mode

    5.3.1 AC Output Mode If the output mode select to AC Mode, the instrument will simulate AC power supply. The default set of IT7900EP series power supply is AC Mode. Set the output parameters of the power supply in the main interface, including the output voltage, output frequency.

  • Page 43: Ac+Dc Mode

    DC power supply. If there are strict noise requirements, additional DC noise filters are needed to obtain low noise and good stable DC voltage for testing. Copyright ©ITECH Electronic Co., Ltd.

  • Page 44: Dc+Ac Mode

    The Vac setting range is 10% of rated voltage. 5.4 Current Limit Mode and Power Limit Mode The IT7900EP series power supply defaults to constant voltage CV output mode. The output voltage can be set in main interface. When the actual current value is higher than the setting current limit value, power supply works in current limit mode, and output voltage will be reduce.

  • Page 45: Current Rms Protection

    Current RMS protection function. The function is mainly used to protect the DUT connected during test to prevent it from damage due to over- current. The OCP (rms) function is always enabled. RMS OCP Type: Copyright ©ITECH Electronic Co., Ltd.

  • Page 46: Set The Current Peak Protection

    To clear the peak OCP and return to normal operation, firstly remove the conditions that caused the protection fault. Press [Shift]+[Esc] key (or send the command PROTection:CLEar) to clear the protection status. The message displayed in front panel is cleared and the instrument exits protection status. Copyright ©ITECH Electronic Co., Ltd.

  • Page 47: Set Voltage/Current/Power Limit Range

    OPP mode. 5.6 Professional Anti-islanding Test Mode The IT7900EP series provide a professional anit-islanding test mode. Users can adjust RLC parameters or configure the parameters of active power and reactive power to simulate islanding status between inverter and load when the main...

  • Page 48: Waveform Selection

    The interface will display the running time value in the island state. 5.7 Waveform Selection The user can set the output waveform in the config menu of IT7900EP series power supply. Eight output waveforms below are available, user can select the Copyright ©ITECH Electronic Co., Ltd.

  • Page 49: Full 4-Quadrant Power Amplifier

    5.8 Full 4-Quadrant Power Amplifier The IT7900EP series regenerative grid simulator can be used as a power amplifier to complete power hardware in the loop (PHIL) applications for microgrids, energy storage and new energy vehicles. The digital I/O or a standard suite of analog signal can be input via an external analog interface (optional) and then amplified without distortion to a real power waveshape.

  • Page 50: Programmable Output Impedance

    The Sweep function is not supported in multi-channel mode. Operating steps Press [Shift] + [F-set](Sweep)on the front panel to enter the sweep interface, as shown in the figure below. Set the voltage and frequency parameters in the sweep interface. Copyright ©ITECH Electronic Co., Ltd.
  • Page 51 Meter to observe the output parameters in the main interface. After sweeping, [On/Off] on the front panel will be off, and status will be displayed on LCD. You can press [Stop] on the Sweep interface to stop the Sweep function. Copyright ©ITECH Electronic Co., Ltd.

  • Page 52: List Function

    Run/Stop: Run/stop the list function. Open: Select the List file to execute. New: Create a new List file. Edit: Edit present list file Delete: delete the present List file. Press [New] and enter to the List file edit interface. Copyright ©ITECH Electronic Co., Ltd.
  • Page 53 Save: Save the list file. Config: configure the list file to make it effective. Clear all: delete all of step information Trig source: select trigger source Click (More)… enter to advanced menu of list file. Copyright ©ITECH Electronic Co., Ltd.

  • Page 54: Select/Run List File

    Press [Shift]+[V-set](list) on the front panel to enter the List function configuration interface. Press [Open], select the saved List01 csv file, and press [Enter] to enter the file. Press [On/Off] on the front panel, turn on the output. Copyright ©ITECH Electronic Co., Ltd.

  • Page 55: Import/Export List File

    5.12.3 Import/Export List file Import List file IT7900EP series support import list file function, The user can finish the editing of List file in Excel and import it into the software. This function simplifies the List file edit and facilitates user operation.

  • Page 56: Operating Steps

    Angle: Executing the surge/sag at specific angle. Trig source Select the trigger source when the mode select to Trigger. Start angle Set the start phase angle of the surge/trap when the mode select to trigger. Copyright ©ITECH Electronic Co., Ltd.

  • Page 57: Self-Defined Waveform Function

    The distorted waveform can simulate voltage harmonic wave in the circuit. The user can set the extent to which the output voltage waveform deviates from the Sin wave voltage and test the usage of the DUT under this circumstance. Copyright ©ITECH Electronic Co., Ltd.
  • Page 58 “ ” Edit the THD wave. Press the “+” or “ ” enter to the edit interface. Thd profile: THD file name Thd formula: Distortion factor calculation formula. %r: displaying harmonics in the form of percentage to the overall voltage Copyright ©ITECH Electronic Co., Ltd.
  • Page 59 Users can edit a custom harmonic waveform file in .csv format and import it into the instrument. User defined harmonic waveform template files can be obtained by contacting ITECH, or an empty file can be exported directly from the instrument.

  • Page 60: Selfdefined

    Order: harmonic order, range from 2-50 Thd: Thd value Phase: phase of harmonic 5.14.2 Selfdefined “+” create a new wave. “-” delete the wave file. “ ” edit the wave file. Edit interface: Profile: user-defined file name Copyright ©ITECH Electronic Co., Ltd.

  • Page 61: Standard Iec Regulations

    Users can edit a user-defined waveform file in .csv format and import it into the instrument. User defined harmonic waveform template files can be obtained by contacting ITECH, or an empty file can be exported directly from the instrument. The user-defined waveform template description as follows:...

  • Page 62: Interface Instruction

    Select the regulations to be tested. the following regulations are supported:  IEC 61000-4-11  IEC 61000-4-13  IEC 61000-4-14  IEC 61000-4-28 Category Test items defined by standard regulations.The third class projects are divided into several sub-projects according to Copyright ©ITECH Electronic Co., Ltd.
  • Page 63 Click Configure to enter the configuration interface of other parameters, and set the Rise time and Fall time.  Run/Stop running or stopping the regulation tests. You must enable the output before running. Otherwise, a message is displayed indicating that the output is not enabled. Copyright ©ITECH Electronic Co., Ltd.
  • Page 64 100*（Umax-Umin）/Udc Time Time value Run time of Ripple test, 0 means continuous running. Stop mode Stop End state Normal Ripple view Ripple frequency Displays ripple DC Umax schematic each Umin parameter. ∠start Copyright ©ITECH Electronic Co., Ltd.

  • Page 65: Enable The Output

    Voltage Source Mode Operation Enable the Output. Click Run and execute the regulation test. Copyright ©ITECH Electronic Co., Ltd.

  • Page 66: Chapter6 Load Mode Operation

    700V. 6.2 Select the Input Mode The IT7900EP series load mode supports AC input mode and DC input mode. The user should set the specific input mode according to the desired application.The input mode is selected in the system menu.

  • Page 67: Ac Input Mode

    If the input mode select to DC Mode, the instrument will simulate DC load. 6.3 AC Load Function IT7900EP series electronic load according to the setting parameters can simulate the AC electronic load. The users can select the load mode in system menu.
  • Page 68 The user can press [Set] and set the input current value in the main interface of CC mode. Directly set the present value through the knob or press numeric keys to input the value. In case of wrong input by numeric keys, press delete the present input. Copyright ©ITECH Electronic Co., Ltd.

  • Page 69: Constant Resistance Mode (Cr)

    1, as shown below. The Slope is R setting Input Voltage Load Current CR mode Voltage-current Relation in CR Mode Select CR mode Press [Config] and enter to the configuration menu. Select constant mode to Copyright ©ITECH Electronic Co., Ltd.

  • Page 70: Constant Power Mode (Cp)

    P (=V * I) at the set value. Input Voltage Set power value Load Current Voltage-current Relation of CP Mode Select CP mode Press [Config] and enter to the configuration menu. Select constant mode to Copyright ©ITECH Electronic Co., Ltd.

  • Page 71: Constant Apparent Power Mode (Cs)

    If the input voltage increases, the input current will decrease to keep the power S (=V * I) at the set value. Copyright ©ITECH Electronic Co., Ltd.
  • Page 72 Waveform (phase shift range: -90.0~90.0): select the waveform. Under CC mode, and Unit PF is off, Waveform can be select.  Crest Factor: CF range is 1.414~5, and the range is limited by peak value. Copyright ©ITECH Electronic Co., Ltd.

  • Page 73: Constant Current +Constant Resistance (Cc+Cr)

    Press [Config] and enter to the configuration menu. Select constant mode to CC+CR. Under the config menu interface, the user can select Const Mode item and set the mode to CC+CR.  Const Mode: load mode Copyright ©ITECH Electronic Co., Ltd.

  • Page 74: Circuit Emulation (Ce)

    In this mode, the R L C parallel state is simulated and the circuit schematic is shown in the figure below. Rectifier single phase RLC This mode simulates a single-phase rectifier R L C circuit, and the circuit schematic is shown in the figure below. Copyright ©ITECH Electronic Co., Ltd.

  • Page 75: Dc Load Function

    DC mode. IT7900P load mode can be operated in the following four modes:  Constant current mode (CC)  Constant voltage mode (CV)  Constant register mode (CR)  Constant power mode (CP)  CC+CV mode Copyright ©ITECH Electronic Co., Ltd.

  • Page 76: Constant Current Mode (Cc)

    In CP mode, the load will consume a constant power. See Figure as follow. If the input voltage rises, the input current will decline. The P (=V * I) will remain on the set power. Copyright ©ITECH Electronic Co., Ltd.

  • Page 77: Complex Operation Mode

    When the voltage rises to exceed the set constant resistance for sinking, it will switch to CR mode for sinking. The CV+CR mode can be applied to the LED simulation and test the LED power supply to get the LED current ripple parameters. Copyright ©ITECH Electronic Co., Ltd.
  • Page 78 The CP+CV mode is often used to UPS battery test, simulate the current change when the battery voltage is decaying. It can also be used to simulate the characteristics of the inputs of DC-DC converters and inverters. Copyright ©ITECH Electronic Co., Ltd.

  • Page 79: Rectified Mode

    The user can choose waveform integrity, including full wave, positive half wave, negative half wave. In this mode, DC current can not be set. Setting method: Enter to System menu, set Rectified to On. Copyright ©ITECH Electronic Co., Ltd.
  • Page 80 Integrity set to Full, the waveform of the power input is rectified in full wave, as shown in the figure below. Integrity set to Positive, the waveform of the power input is rectified in positive half wave, as shown in the figure below. Copyright ©ITECH Electronic Co., Ltd.
  • Page 81 If programmed is negative it will be a lagging power factor. The range of CF setting is 1.414~5, and the range of Phase shift changes by CF setting. The relationship graph is show as below. Copyright ©ITECH Electronic Co., Ltd.

  • Page 82: Waveform Selection

    CF & Phase shift relationship 6.6 Waveform Selection The user can set the input waveform in the config menu of IT7900P series load. Eight input waveforms below are available, user can select the waveform in Config->Waveform menu. Copyright ©ITECH Electronic Co., Ltd.

  • Page 83: Phase Loss

    Users can turn off the function of three-phase balance control in the Config menu. At this time, the IT7900P load can simulate the three-phase unbalance mode, and the input parameters of ABC three phases can be set independently. Copyright ©ITECH Electronic Co., Ltd.

  • Page 84: Load Angle And Unload Angle Control

    When On Phase is set to angle control and the angle is set to 270°, the waveform is shown below. When Off Phase is set as angle control and the angle is set to 90°, the waveform is shown below. Copyright ©ITECH Electronic Co., Ltd.

  • Page 85: Sweep Function

    Set the step value. Mode Set the sweep mode. Time: Time Sweep Mode Trig: Trigger mode Time-back-forth: Step switching according to time and scanning back and forth. Trigger-back-forth: Step switching according to trigger and scanning back and forth. Copyright ©ITECH Electronic Co., Ltd.

  • Page 86: Synchronization Function

    Connect the IO-4 pins of two IT7900P instruments. One unit inputs synchronization signals to the other unit. The second load runs synchronously with the frequency and phase of the first load to realize the six-phase input function.The wiring diagram is as follows: First Second Copyright ©ITECH Electronic Co., Ltd.

  • Page 87: Load Configuration

    (see 8.3 “Self-defined Waveform Function” for details) and combine the waveform files into a List file based on required order. Meanwhile, the user can set the starting steps of the Copyright ©ITECH Electronic Co., Ltd.

  • Page 88: Create A New List File

    Run/Stop: Run/stop the list function. Open: Select the List file to execute. New: Create a new List file. Edit: Edit present list file Delete: delete the present List file. Press [New] and enter to the List file edit interface. Copyright ©ITECH Electronic Co., Ltd.
  • Page 89 Save: Save the list file. Config: configure the list file to make it effective. Clear all: delete all of step information Trig source: select trigger source Click (More)… enter to advanced menu of list file. Copyright ©ITECH Electronic Co., Ltd.

  • Page 90: Select/Run List File

    Press [Shift]+[V-set](list) on the front panel to enter the List function configuration interface. Press [Open], select the saved List01 csv file, and press [Enter] to enter the file. Press [On/Off] on the front panel, turn on the input. Press [Run] in the list function interface. Copyright ©ITECH Electronic Co., Ltd.

  • Page 91: Import/Export List File

    Press [Export]. This file will be exported into the USB disk. 6.13 Setting of Surge/Sag Configuration IT7900P provides surge/sag simulation. The user can add surge/sag to simulate abnormal voltage fluctuation on the basis of inputting wave, and test usage of the DUT under this circumstance. Copyright ©ITECH Electronic Co., Ltd.
  • Page 92 Angle width=30 degree, then, the waveform will execute surge/sag at 30 to 60 degree. Symmetry Whether to produce symmetrical surge/sag waves. If Start angle + Angle width >180°,this setting is Off state. Repeat count repeat count of surge/sag waves. Copyright ©ITECH Electronic Co., Ltd.

  • Page 93: Self-Defined Waveform Function

    Sin wave voltage and test the usage of the DUT under this circumstance. THD includes built-in 30 waveforms and user - defined waveforms.The interface is shown below. Copyright ©ITECH Electronic Co., Ltd.
  • Page 94 Thd profile: THD file name Thd formula: Distortion factor calculation formula. %r: displaying harmonics in the form of percentage to the overall voltage amplitude of all harmonics. %f: displaying harmonics in the form of percentage to the fundamental voltage. Copyright ©ITECH Electronic Co., Ltd.

  • Page 95: Selfdefined

    “-” delete the wave file. “ ” edit the wave file. Edit interface: Profile: user-defined file name Origin Symmetry: To select the waveform data type, you can select 512 origin symm/512 origin asymm /1024 points Copyright ©ITECH Electronic Co., Ltd.

  • Page 96: Protection Function

    Delay delay time of protection 6.15.1 Out-of-range frequency protection When the measured frequency is beyond the required frequency range (16Hz to 500Hz) or beyond the limit value setting in Frequency protection, “FE” will be displayed. Copyright ©ITECH Electronic Co., Ltd.

  • Page 97: Undervoltage Protection

    Press the up/down key or rotate the knob to select Over current protection (OCP) and press [Enter]. Set the protection state, Level, the delay time in sequence, and press [Enter] to confirm. Clear Protection When protection occurs, the instrument responds as follows: Copyright ©ITECH Electronic Co., Ltd.

  • Page 98: Peak Over Current Protection

    When protection occurs, the instrument responds as follows:  Instrument input is off;  The buzzer sounds;  The interface displays “OPP” and flashes To clear the protection and return to normal operation, firstly remove the Copyright ©ITECH Electronic Co., Ltd.

  • Page 99: Over-Temperature Protection (Otp)

    To clear the protection and return to normal operation, firstly remove the conditions that caused the protection fault. Press [Shift] +[Esc] key (or send the command PROTection:CLEar) to clear the protection status. The message displayed in front panel is cleared and the instrument exits protection status. Copyright ©ITECH Electronic Co., Ltd.

  • Page 100: Chapter7 System-Related Functions

    Set the Lock-frequency ON/OFF state  Status Off: turn off the function  Lock-Freq: Lock frequency  Lock-Phase: Lock phase Set the phase deviation between Phase Delay the output phase and the external I/O input signal: 0-360° Copyright ©ITECH Electronic Co., Ltd.
  • Page 101 Filter measurement. Menu of Load mode: Device operation Set the instrument mode mode Volt Source: voltage source load Load: load mode Load Phase mode Set the AC input mode 1-Phase Single phase 3-Phase Three phase Copyright ©ITECH Electronic Co., Ltd.
  • Page 102 Measurement Off: disable the sense function Input on phase control On/Off phase On-mode Phase: setting the phase Imm: immediately Input off phase control Off-mode Phase: setting the phase Imm: immediately Measurement Set the measurement speed Copyright ©ITECH Electronic Co., Ltd.
  • Page 103 Knob setting will take effect immediately. If set to ON, Knob immediately the Knob setting will take effect immediately. If set to effective OFF, press ENTER to confirm the effect after the Knob setting is completed. Language Set the language of display English English Copyright ©ITECH Electronic Co., Ltd.
  • Page 104  Inhibit-living:  Inhibit-latch Function  Input  Output Digital IO-2: PS Function setting of pin 2 Clear On/Off, Select Invert or not under the Reverse IO Settings. If setting to ON, it means Copyright ©ITECH Electronic Co., Ltd.
  • Page 105 Freq change is 0.1Hz (This configuration is displayed only when the IO pin is set to Trigger1-out) On/Off: When On is selected, the List List Copyright ©ITECH Electronic Co., Ltd.

  • Page 106: Menu Function

    This parameter is used to set the status after the power output is off.  Select to High-Z, After the power output is Off, the dc impedance between the terminals of the power supply is high, and the resistance value varies with different models. Copyright ©ITECH Electronic Co., Ltd.
  • Page 107 This parameter determines the state of the touch screen. 1. Press the General under the system menu. 2. Press the Up/Down key or turn the knob to select the Touch screen lock and press [Enter].  On: enable the touch screen Copyright ©ITECH Electronic Co., Ltd.

  • Page 108: Set The Communication Interface

    Configuration menu of source mode: Configuration setting for DC mode Config Vdc: Output voltage of DC, range from 0- Voltage DC full scale Slew Rate: Slope , range from 0-5000V/ms Copyright ©ITECH Electronic Co., Ltd.
  • Page 109 5000V/ms Output voltage of DC, range from 0-10% of Voltage DC full scale Slew Rate: Slope , range from 0-5000V/ms Freq: output frequency, range from 16- 150Hz Frequency Slew Rate: slope, range from 0.00001- 5000Hz/ms Copyright ©ITECH Electronic Co., Ltd.

  • Page 110: Balance Control Setting

    Angle difference setting parameter between AB and AC. 7.2.2 Dimming Function(For Source mode) The front and back edge of the waveform can by concealed and the phase Copyright ©ITECH Electronic Co., Ltd.

  • Page 111: Setting The Voltage And Current Phase Shift (For Load Mode)

    PF is as close to 1 as possible. Set to Off to disable the UPF mode, at which time the actual power factor is affected by the voltage waveform, current waveform, and phase shift. CF, PS, and PF can only be set at off mode. Copyright ©ITECH Electronic Co., Ltd.
  • Page 112 The range of CF setting is 1.414~5, and the range of Phase shift changes by CF setting. The relationship graph is show as below. CF & Phase shift relationship Copyright ©ITECH Electronic Co., Ltd.

  • Page 113: Key Lock Function

     Press the composite keys [Shift]+[4] (Save) to save the parameters. Pressthe composite keys [Shift]+[5] (Recall) to recall the parameters.  SCPI commands: *SAV and *RCL Save Operation The save operation procedures are as follows: Copyright ©ITECH Electronic Co., Ltd.

  • Page 114: Recall Operation

    Manual: if [Trig] on the front panel is pressed in the valid manual trigger mode, the power supply will be triggered once.  Bus: if the bus trigger command is received by the power supply in the valid Copyright ©ITECH Electronic Co., Ltd.

  • Page 115: Query The System Log

    1. Ensure that the power switches of the three units and the main switch of the AC power distribution box are off. 2. Refer wiring connection diagram to connect three units. For long distance testing requirements: Copyright ©ITECH Electronic Co., Ltd.
  • Page 116 System-Related Functions For short distance test requirements: 3. Connect the AC input terminals of the three units separately, and connect Copyright ©ITECH Electronic Co., Ltd.
  • Page 117 2. Set three units in parallel mode with one master and two slaves. 3. Press the composite keys [Shift]+ (System) on the front panel to enter the system menu. 4. Select General menu. Copyright ©ITECH Electronic Co., Ltd.
  • Page 118 AC power input (distribution box) is off.  Before connecting 3 single instruments to the AC distribution box, ensure that the distribution box capacity is sufficient. Refer to the corresponding specifications for the AC input parameters of a single instrument. Copyright ©ITECH Electronic Co., Ltd.
  • Page 119 3U model instrument.  Each cabinet has a red role selection button that allows the user to switch the red button to select the present instrument as a master or as Copyright ©ITECH Electronic Co., Ltd.

  • Page 120: Remote Measurement Function

    This series power supply supports digital I/O function. The user can realize logic control over high and low level input or output by related configurations in the system menu. Pins Introduction Different I/O implements different functions. The detailed functions description are shown in the figure below: Copyright ©ITECH Electronic Co., Ltd.
  • Page 121 Range: 1.6V-15V High level signal Current: ≤100mA Input signal Low level signal Typical: 0V Range: -5V-0.8V Current: ≤100mA High level signal Voltage level: 5V Current: ≤1mA Output signal Low level signal Voltage level: 0V Current: 0.5mA Copyright ©ITECH Electronic Co., Ltd.
  • Page 122 IO-1 pin can be set to 【PS-clear】, 【Input】, 【Output】 The default function is to clear the protected state. When the protection occurs, the protection state can be cleared through this pin, so that the instrument can Copyright ©ITECH Electronic Co., Ltd.
  • Page 123 IO-7 can be set to【Trigger2-in】, 【Trigger2-out】, 【Input】,【Output】 【Trigger2-in】: The input trigger signal, the pulse signal sent to the IO-6 pin can be used as the trigger source. Users can select as the trigger source of the corresponding function in the menu. Copyright ©ITECH Electronic Co., Ltd.

  • Page 124: Analogue Function (Ext-Program) (Optional)

    When output is DC, –10V ~ 10V voltage value to set the voltage between negative full range and positive full scale. When output is AC, 0-10V voltage value to set the 0 to full scale. Copyright ©ITECH Electronic Co., Ltd.
  • Page 125 5V, the voltage ratio set to 50V/1 under source menu, the instrument output voltage is set to 5*50=250V. When parallel machine operation, can be controlled through the host analog interface. Copyright ©ITECH Electronic Co., Ltd.

  • Page 126: Voltage And Current Monitoring

    The -10V ~ 10V voltage reading corresponds to the power voltage and current output between negative full range and positive full scale (For AC, 0 to 10V corresponds to 0 to full scale). The wiring diagram is shown in the figure below. Copyright ©ITECH Electronic Co., Ltd.
  • Page 127 System-Related Functions Copyright ©ITECH Electronic Co., Ltd.

  • Page 128: Chapter8 Measurement Functions

    Setting frequency Only valid in AC/ACDC/DCAC mode. Active power [W] Power factor Crest factor Ithd Current THD Uthd Voltage THD Ipeak Current peak value [A] Positive current peak value [A] Negative current peak value [A] Copyright ©ITECH Electronic Co., Ltd.

  • Page 129: Oscilloscope Mode

    Ready status, the instrument immediately restarts one measurement and then enters the Stop status. Run/Stop: press the corresponding soft key to run or stop the waveform status. AutoSet: Automatically adjusts the scale of the appropriate vertical axis. Copyright ©ITECH Electronic Co., Ltd.

  • Page 130: Vertical Calibration

    The slope refers to the change of the signal from low level to high level (rising edge) or from high level to low level (falling edge). The slope used as a trigger condition is referred to as the trigger slope. Copyright ©ITECH Electronic Co., Ltd.

  • Page 131: Harmonic Measurement

     Harmonic bar chart screen Description of keys on the harmonic display interface: : Select the voltage/current harmonic : Distortion factor calculation formula. Copyright ©ITECH Electronic Co., Ltd.
  • Page 132 LIST. You can press the Up and Down key to display the hidden rows, i.e. hidden data of single harmonic data.  Introduction to vector interface When vector mode is selected in the harmonic measurement mode, to enter the vector measurement interface, as shown in the figure below. Copyright ©ITECH Electronic Co., Ltd.

  • Page 133: Harmonic Analysis

    Disable: Does not perform harmonic analysis U-THD Total harmonic distortion of voltage I-THD Total harmonic distortion of current total harmonic current (The total rms value of the harmonic current components of order 2 to 40) Copyright ©ITECH Electronic Co., Ltd.
  • Page 134 Ih: harmonic current component Rise (IEC61000-3-12) Minimum short-circuit ratio limit value After setting, press Esc to return to the harmonic measurement interface, and the instrument measurement interface will display the results after harmonic analysis. Copyright ©ITECH Electronic Co., Ltd.

  • Page 135: Recorder Function

    File format: select the file format, include Tdms and CSV.  Export to udisk: exporting all of present data to U disk.  Meter sample: Set the sampling interval. Hold-On/Hold-Off: Pause screen data refresh (for data observation)/ Start Copyright ©ITECH Electronic Co., Ltd.
  • Page 136 Measurement Functions dynamically observing the data Auto: Automatically adjusts the scale of the appropriate vertical axis. Time: The time value of each of the horizontal coordinates, unit is s/Div Vernier: Position information of the vernier caliper. Copyright ©ITECH Electronic Co., Ltd.

  • Page 137: Chapter9 Technical Specifications

    ＜0.2% + 0.3% F.S. 150.01Hz～500Hz ＜0.3%+(0.6%*kHz) 500.01Hz～2.4kHz F.S. Temperature coefficient < 200ppm/℃ F.S. Frequency 16～500 Range High 16～2.4k Resolution 0.01 0.01% 16Hz～500Hz Accuracy 0.1% 500.01Hz～2.4kHz waveform synthesizer 50/60Hz up to 50 orders Phase Range ° 0～360 Copyright ©ITECH Electronic Co., Ltd.
  • Page 138 Input voltage VLL（3phase） 51.96～606 VLL（reverse） 30～700 Input frequency 16～500 RMS（1phase） Crest Factor Peak（1phase） Input current (3phase/reverse) Peak (3phase/reverse) Per Phase (3phase ) Max. Power Input power （reverse phase ) Max. Power （1phase/3phase） CC Mode （1phase） Copyright ©ITECH Electronic Co., Ltd.
  • Page 139 1phase Vcap Range 0 ～ 499.924 reverse phase 0 ～ 499.924 3phase 0 ～ 5 1phase Vdiode RangeL 0 ～ 5 reverse phase 0 ～ 5 3phase 318.15 1phase Max peak current 106.05 reverse phase Copyright ©ITECH Electronic Co., Ltd.
  • Page 140 Apparent power Resolution 0.001 ＜0.4% +0.4% F.S. Accuracy Range 1～5 CF Measure 0.01 Resolution Range 0.1～1 PF Measure 0.01 Resolution 1%F.S Accuracy Harmonic 50/60Hz orders Max. up to 50 measurement Regenerative Max. Regenerative power ITHD < Copyright ©ITECH Electronic Co., Ltd.

  • Page 141: It7942Ep-350-210

    In the rectifier load mode, the setting range of phase Angle is related to CF. The larger CF is, the larger the range of phase Angle can be set. All the above parameters are subject to change without prior notice from ITECH. IT7942EP-350-210...
  • Page 142 0～42 reverse 0～28 3phase 0～14 kVar QL Range 1phase 0～42 kVar reverse 0～28 kVar 3phase 0～14 kVar QC Range 1phase 0～42 kVar reverse 0～28 kVar anit-islanding RLC Ω 3phase 0.5～500 R Range Ω 1phase 0.167～166.667 Copyright ©ITECH Electronic Co., Ltd.
  • Page 143 3phase 1.5～2000 0.001 ～ 19800 1phase C Range 0.001 ～ 6600 reverse phase 0.001 ～ 6600 3phase 1phase 0.143～166.66 Ω Rc Range reverse phase 0.429～499.98 3phase 0.429～499.98 1phase 0.143～166.66 Ω RL Range reverse phase 0.429～499.98 Copyright ©ITECH Electronic Co., Ltd.
  • Page 144 Measurement parameter (Load) Range 0～350 Vrms Resolution 0.01 Voltage RMS ＜0.1%+0.1% F.S. Accuracy DC,16Hz～500Hz Temperature coefficient < 100ppm/℃ F.S. Range 0～210 Resolution Current RMS ＜0.1% + 0.2% F.S. DC,16Hz～150Hz Accuracy ＜0.2% + 0.3% F.S. 150.01Hz～500Hz Copyright ©ITECH Electronic Co., Ltd.
  • Page 145 When frequency <150Hz, the minimum current for test need to be 1%F.S. frequency >150Hz, the minimum current for test need to be 3%F.S. When loopSpeed Low is low，it can better complied DUT’ s characteristics； When LoopSpeed is High，the dynamic response time is faster. Test condition: current>10%F.S., frequency<150Hz。 Copyright ©ITECH Electronic Co., Ltd.

  • Page 146: It7963Ep-350-315

    In the rectifier load mode, the setting range of phase Angle is related to CF. The larger CF is, the larger the range of phase Angle can be set. All the above parameters are subject to change without prior notice from ITECH. IT7963EP-350-315...
  • Page 147 < 200ppm/℃ F.S. CP Mode Max. Power （1phase/3phase） Max. Power Range （reverse phase ) Per Phase (3phase ) Resolution 0.001 ＜0.4% +0.4% F.S. Accuracy DC,16Hz～500Hz Temperature coefficient < 200ppm/℃ F.S. CS Mode Max. Power （1phase/3phase） Copyright ©ITECH Electronic Co., Ltd.
  • Page 148 -1.00 ～ 1.00 Range 0.01 Resolution 30 ～ 499 1phase Voltage range 30 ～ 998 reverse phase 1phase 0～315 DC Mode Current range reverse phase 0～35 Current rise slope CC, CV, CR, CP，CC+CV，CR+CV，CP+CV，CC+CR，CC+CV+CP+CR Work mode Copyright ©ITECH Electronic Co., Ltd.
  • Page 149 ( 200～220 ) ±10%, the power of 12kw and above is 60% of the rated. According to the output frequency, the output voltage will be reduced, the rated voltage can be out within 1.4K, the maximum output voltage at 2KHz is 250.76Vrms and 2.4KHz is 208.97Vrms. Copyright ©ITECH Electronic Co., Ltd.

  • Page 150: It7984Ep-350-420

    In the rectifier load mode, the setting range of phase Angle is related to CF. The larger CF is, the larger the range of phase Angle can be set. All the above parameters are subject to change without prior notice from ITECH. IT7984EP-350-420...
  • Page 151 Voltage Slew ≥2 V/µs with full-scale programmed voltage step Rate, Typical Output Isolation 550Vac Input parameters(Load) 30～350 Input voltage VLL（3phase） 51.96～606 VLL（reverse） 30～700 Input frequency 16～500 RMS（1phase） Crest Factor Peak（1phase） 1260 Input current (3phase/reverse) Peak (3phase/reverse) Copyright ©ITECH Electronic Co., Ltd.
  • Page 152 0.07 ～ 2000 reverse phase 0.07 ～ 2000 3phase 0.001 ～ 39600 1phase C Range 0.001 ～ 13200 reverse phase 0.001 ～ 13200 3phase 1phase 0～83.333 Ω Range reverse phase 0～249.99 3phase 0～249.99 0 ～ 499.924 1phase Copyright ©ITECH Electronic Co., Ltd.
  • Page 153 0～84 kVAR Reactive power Resolution 0.001 kVAR ＜0.4% +0.4% F.S. Accuracy Range 0～84 Apparent power Resolution 0.001 ＜0.4% +0.4% F.S. Accuracy Range 1～5 CF Measure 0.01 Resolution 0.1～1 Range PF Measure 0.01 Resolution Accuracy 1%F.S Copyright ©ITECH Electronic Co., Ltd.

  • Page 154: It79105Ep-350-525

    In the rectifier load mode, the setting range of phase Angle is related to CF. The larger CF is, the larger the range of phase Angle can be set. All the above parameters are subject to change without prior notice from ITECH. IT79105EP-350-525...
  • Page 155 Voltage ripple < 0.8 Dynamic response 1000 mΩ 3phase/multichannel 0～200 R Range mΩ 1phase 0～66.667 mΩ Programmable reverse 0～400 impedance 3phase/multichannel 0～200 L Range 1phase 0～66.667 reverse 0～400 3phase 0～35 P Range 1phase 0～105 reverse 0～70 Copyright ©ITECH Electronic Co., Ltd.
  • Page 156 0.174～199.99 Ω 3phase 0.174～199.99 Ω Resolution 0.001 Accuracy 0.4%+0.4%F.S. Circuit Emulation(CE)-Parallel rlc 1phase 0.058～66.666 AC Mode Ω R Range reverse phase 0.174～199.99 3phase 0.174～199.99 1phase 0.2～2000 L Range reverse phase 0.6～2000 3phase 0.6～2000 Copyright ©ITECH Electronic Co., Ltd.
  • Page 157 Resolution Peak current ＜0.4% + 0.6% F.S. 16Hz～500Hz Accuracy ＜0.4% + (1.2%*kHz) F.S. 500.01Hz～2.4kHz Resolution Output power ＜0.4% +0.4% F.S. DC,16Hz～500Hz Accuracy ＜0.4% +(0.8%*kHz) F.S. 500.01Hz～2.4kHz Harmonic Max. 50/60Hz up to 50 orders measuremen Copyright ©ITECH Electronic Co., Ltd.
  • Page 158 Under the output frequency of 50Hz/60Hz, the maximum CF is 5 without exceeding the peak current; under the condition of full current and full power, the maximum CF is 3. When frequency <150Hz, the minimum current for test need to be 1%F.S. frequency >150Hz, the minimum Copyright ©ITECH Electronic Co., Ltd.

  • Page 159: It78126Ep-350-630

    In the rectifier load mode, the setting range of phase Angle is related to CF. The larger CF is, the larger the range of phase Angle can be set. All the above parameters are subject to change without prior notice from ITECH. IT78126EP-350-630...
  • Page 160 (3phase/reverse) Resolution ＜0.1% + 0.2% F.S. DC,16Hz～150Hz Accuracy ＜0.2% + 0.3% F.S. 150.01Hz～500Hz Temperature coefficient < 200ppm/℃ F.S. CP Mode Max. Power 126k （1phase/3phase） Max. Power Range （reverse phase ) Per Phase (3phase ) Resolution Copyright ©ITECH Electronic Co., Ltd.
  • Page 161 ° Range -90º~+90º (Current Source Mode: +90.01º~+180º & -90.01º~-180º) Resolution 0.01 ° Accuracy 1% F.S. CF Setting 1.414 ～ 5.0 Range Resolution 0.001 PF Setting -1.00 ～ 1.00 Range Resolution 0.01 30 ～ 499 1phase Copyright ©ITECH Electronic Co., Ltd.
  • Page 162 0℃-50℃ temperature Programming response time Remote Sense Compensatio n Voltage Communication Built-in USB/CAN/LAN/Digital IO interface, optional GPIB / Analog&RS232 interface ( 200～220 ) ±10%, the power of 12kw and above is 60% of the rated. Copyright ©ITECH Electronic Co., Ltd.
  • Page 163 In the rectifier load mode, the setting range of phase Angle is related to CF. The larger CF is, the larger the range of phase Angle can be set. All the above parameters are subject to change without prior notice from ITECH. Copyright ©ITECH Electronic Co., Ltd.

  • Page 164: Chapter10 Remote Control

    4. Select the USB device class to TMC or VCP. 10.2 LAN Interface When the user connect PC through LAN interface, the following is required to use the LAN interface. The LAN interface complies with the LXI standard. Copyright ©ITECH Electronic Co., Ltd.

  • Page 165: Connect Interface

    Gateway: This value is the IP Address of the default gateway that allows the instrument to communicate with systems that are not on the local subnet, as determined by the subnet mask setting. The same numbering notation ap- plies as for the IP Address. Copyright ©ITECH Electronic Co., Ltd.
  • Page 166 Information: Displays the serial number of the instrument and more system information as well as LAN configuration parameters;  Web Control: Enables the Web control to begin controlling the instrument. This page allows you to monitor and control the instrument; Copyright ©ITECH Electronic Co., Ltd.

  • Page 167: Can Interface

    Inspection and Installation  LAN Configuration: Reconfigure the LAN parameters;  Manual: Go to the ITECH official website and view or download the relevant documents.  Upload: Performs a system upgrade. Click CONNECT to connect the PC with the instrument, then click Select File to select the system upgrade installation package (for example, IT7900P-U-VXXX.itech), and then click UPLOAD performs the upgrade...

  • Page 168: Gpib Interface (Optional)

    GPIB address appears in the System menu. The specific steps are as follows: 1. Ensure that the instrument's power switch is off, that is, the instrument is Copyright ©ITECH Electronic Co., Ltd.

  • Page 169: Interface (Optional)

    When you purchase the interface accessory and successfully insert it into the corresponding position on the rear panel of the instrument, the RS–232 menu item will appear in the System menu. The specific steps are as follows: Copyright ©ITECH Electronic Co., Ltd.

  • Page 170: Commonly Used Commands Overview

    SYSTem:FUNCtion ONE //Set the output mode to AC mode FUNCtion AC //Set the voltage RMS to 220V VOLTage 220 //Set the frequency to 60Hz FREQuency 60.0 //Set the current RMS protect value to CURRent:PROTection:RMS 90 Copyright ©ITECH Electronic Co., Ltd.

  • Page 171: Demo Software Introduction

    PV7900P Demo Software(Standard) IT7900 series power supply supporting remote control software, users can directly obtain the software from ITECH agent and install to the PC, to achieve remote control equipment by visualization method, IT9000-PV7900 software can achieve all the instrument panel operation. And the interface is simple and convenient to operate.

  • Page 172: Appendix

    Appendix Specifications of Red and Black Test Lines ITECH provides you with optional red and black test lines, the user can choose the company's test line for testing. For specifications of ITECH test lines and maximum current values, refer to the table below.

This manual is also suitable for:

It7921ep-350-105It7942ep-350-210It7963ep-350-315It7984ep-350-420It79105ep-350-525It78126ep-350-630

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