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Elgar EasyWave EW 3001 Operation Manual

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EasyWave AC Power Source
EasyWave AC Power Source
ELGAR CORPORATION
9250 Brown Deer Road
San Diego, CA 92121
This document contains information proprietary to Elgar Corporation. The information contained
herein is not to be duplicated or transferred in any manner without prior written permission from
Elgar Corporation.
Document No. M161483-01 Rev. C
Model EW 3001
Operation Manual
©1998 ELGAR CORPORATION
EW 3001
Operation
December 2, 1998

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  • Page 1 EW 3001 Operation ©1998 ELGAR CORPORATION This document contains information proprietary to Elgar Corporation. The information contained herein is not to be duplicated or transferred in any manner without prior written permission from Elgar Corporation. Document No. M161483-01 Rev. C...
  • Page 3 Buyer returns the defective product in the original, or equivalent, shipping container; • if, upon examination of such product by Elgar it is disclosed that, in fact, a defect in materials and/or workmanship does exist, that the defect in the product was not caused by improper conditions, misuse, or negligence;...

  • Page 4: Safety Notice

    SAFETY NOTICE Before applying power to the system, verify that the unit is properly configured for your application. WARNING! HAZARDOUS VOLTAGES IN EXCESS OF 280 VRMS, 600V PEAK MAY BE PRESENT WHEN COVERS ARE REMOVED. THERE ARE NO USER SERVICEABLE COMPONENTS IN THE UNIT. Installation and service must be performed by qualified personnel who are aware of dealing with attendant hazards.

  • Page 5: Table Of Contents

    CONTENTS Warranty.............................i Safety Notice..........................ii OVERVIEW Introduction........................1-1 Features .......................... 1-1 Configuration ........................1-1 Input/Output........................1-1 Specifications ........................1-2 1.3.1 Input........................1-2 1.3.2 Output........................1-2 1.3.3 Front Panel Display ....................1-4 1.3.4 GPIB/RS-232 Readback..................1-5 Operational Panels ......................1-6 1.4.1 The Front Panel ....................1-6 1.4.2 Rear Panel......................
  • Page 6 Save and Recall .......................3-8 Data Lock.........................3-8 Ext Prog ...........................3-9 Measurement ......................... 3-10 3.7.1 Select Measurement Items ................. 3-10 3.7.2 Functions of Measurement.................. 3-10 Local Operation......................3-11 3.9 Protection .......................... 3-11 THEORIES OF OPERATION3- Introduction ........................4-1 Description of Overall System...................4-1 AC/DC Power Stage Converter ..................4-3 DC/DC Power Stage Converter ..................4-3 DC/AC Inverter.........................4-3 CPU ..........................4-3...

  • Page 7: Overview

    1 OVERVIEW Introduction The Elgar EW 3001 AC Power Source is a highly efficient AC Power Source providing sine wave output of low distortion. The microprocessor-controlled sine wave oscillator generates accurate and stable output voltage and frequency. The PWM (Pulse Width Modulation) approach of the power stage provides full volt-ampere and current rating to loads.

  • Page 8: Specifications

    EW 3001 Operation Manual Specifications The operational specifications of the Elgar EW 3001 are listed below. All specifications are tested according to the standard Elgar test procedures. All specifications are based on a full rated power resistive load at 25ºC ±1ºC specified otherwise.
  • Page 9 Overview Parameter Units Value Voltage Programming Resolution Volts AC RMS 0.1 maximum (GPIB/RS-232/Front panel) 0.4% Voltage Programming Accuracy Percent of full (Analog) scale 0.1% maximum Voltage Drift, excluding external Percent per analog control degree Celsius Inductive Output Impedance 250 maximum Resistive Output Impedance Ohms 0.25 maximum...

  • Page 10: Front Panel Display

    EW 3001 Operation Manual 1.3.3 Front Panel Display Parameter Units Value Output Voltage Accuracy 0.3% of full scale + 0.2% of reading maximum Output Voltage Resolution Volts RMS 0.1 maximum Output Current Accuracy 0.3% of full scale + 0.5% of reading maximum Output Current Resolution Amperes RMS...

  • Page 11: Gpib/Rs-232 Readback

    Overview 1.3.4 GPIB/RS-232 Readback Parameter Units Value Output Voltage Accuracy 0.3% of full scale + 0.2% of reading maximum Output Voltage Resolution Volts RMS 0.1 maximum Output Current Accuracy 0.3% of full scale + 0.5% of reading maximum Output Current Resolution Amperes RMS 0.01 maximum Output Power Range...

  • Page 12: Operational Panels

    EW 3001 Operation Manual Operational Panels 1.4.1 The Front Panel Figure 1-1 Front Panel Item Symbol Description Alphanumeric LEDs: A row of red 7-segment LEDs display setup messages and numeric settings or measurement results. The display area is divided into three sections; values of V appear on the left, frequency or I limit appears in the middle, and any of I/P/PF/CF measurement values appear on the right.
  • Page 13 Overview Item Symbol Description V/F or I limit selection key: In normal mode, this key allows you to program either voltage or frequency. In shift mode, this ----- or ----- key allows you to program the rms (root mean square) limit on the output current.

  • Page 14: Rear Panel

    EW 3001 Operation Manual 1.4.2 Rear Panel Figure 1-2 Rear Panel Item Name Description Series No. Label Each set of the EW 3001 instruments has its own identification number and input rating marked on this label. Output Terminal Power line output is connected to the EW 3001 through this Block connector.

  • Page 15: Installation

    Save all packing materials in case the unit has to be returned. If any damage is found, please file a claim with the carrier immediately. Do not return the instrument to the factory without prior RMA acceptance from Elgar. Preparation for Use Connect the instrument with an appropriate AC line input.

  • Page 16: Input Connection

    EW 3001 Operation Manual 2.3.2 Input Connection The input power terminal block is located on the rear panel of the instrument. See Figure 2-1. Input of the EW 3001 must be connected from a three-wired single phase AC power outlet. The current rating of the power line input must be larger than or equal to that of the fuse of the instrument.

  • Page 17: Output Connection

    Installation Output Connection Output power can be connected from the terminal block located on the rear panel of the instrument through terminals L and N to the load as shown in Figure 2-2. For safety, the wires to the load should be of a sufficiently large gauge to ensure that they do not overheat while carrying the output current.

  • Page 18: Power-On Procedures

    EW 3001 Operation Manual Power-on Procedures Apply the line power to the input terminals, and turn on the power switch on the front panel. No load shall be connected to the output terminal block. The instrument will do a series of self-tests whenever the user turns on the power switch.

  • Page 19: I/O Connectors (Optional)

    Installation I/O Connectors (Optional) Figure 2-3 GPIB Figure 2-4 RS-232C...
  • Page 20 EW 3001 Operation Manual Figure 2-5 APG Figure 2-6 Optional Board...

  • Page 21: Local Operation

    3 LOCAL OPERATION Introduction The Elgar EW 3001 AC power source can be configured to operate in local or remote mode. Operation of the EW 3001 through a keypad on the front panel for data entry and test execution in local mode are described here; remote operation through a GPIB controller is described in Section 6.

  • Page 22: Gpib Address

    EW 3001 Operation Manual 3.2.1 GPIB Address Prior to operating in remote mode (detailed in Section 6 of this manual), set the GPIB address. Valid addresses range from 0 to 30. For example, to set the GPIB address to 25: ACTION LED DISPLAY 1.

  • Page 23: Ovp

    Local Operation 3.2.3 OVP The EW provides output voltage protection (OVP) to protect the load. You can specify the upper limit for output voltage; the default limit is 300V. For example, to set output voltage not to exceed 120V: ACTION LED DISPLAY 1.

  • Page 24: System Test

    EW 3001 Operation Manual 3.2.5 System Test The EW allows you to verify that the output power is within specification. To perform the system test verification, follow the steps below. WARNING! Disconnect any output load before performing the system test. ACTION LED DISPLAY 1.

  • Page 25: Power On Status

    Local Operation 3.2.6 Power On Status You can set the initial value for output voltage, frequency, and range when the power switch is turned on. For example, to set the initial output data to 230V, 50Hz, and range 300: ACTION LED DISPLAY 1.

  • Page 26: Output Setting And Execution

    EW 3001 Operation Manual Output Setting and Execution After the power-on self-test and configuration setup procedures are complete, the following values are displayed: 60.0 0.00 This indicates the present output setting for Vrms is 0 Volts, the output Freq is 60 Hz, and any of the measured output values (including I/P/PF/CF) is 0.

  • Page 27: Output V And F

    Local Operation 3.3.3 Output V and F Specify values for output voltage and frequency. For example, to set V to 135.5 volts and F to 82 Hz: ACTION LED DISPLAY 1. If the EXT PROG indicator is on, turn it off by pressing key, then (EXT PROG in shift mode).

  • Page 28: Save And Recall

    EW 3001 Operation Manual Save and Recall The EW offers nine memory channels to save a set of frequently used V, F, and V full range, and to recall them for later use. For example, to save settings to the memory channel 5: ACTION LED DISPLAY 1.

  • Page 29: Ext Prog

    Local Operation Ext Prog The EW allows you to use an external DC voltage level as a linear control reference for output Vrms. The relationship of Vout and the Vref is as follows: Vout = Vref ÷ 10V × Vfs Vout: The Vrms output of the EW Vref: DC level of the external control voltage Vfs: The present setting of full scale (full range) of output Vrms.

  • Page 30: Measurement

    EW 3001 Operation Manual Measurement The EW 3001 can measure the actual performances of V, F, I, P, PF, and CF of a connected load alone when it outputs power to the load. Note that when output is enabled, the left and center sections of the 7-segment LED display show the actual voltage and frequency;...

  • Page 31: Local Operation

    Local Operation Local Operation During remote operation, the EW is controlled by a remote GPIB or RS-232C controller, and the green RMT indicator LED remains illuminated. To switch from remote to local (front panel) operation: 1. Press the key to enter SHIFT mode. 2.
  • Page 32 EW 3001 Operation Manual This page intentionally left blank. 3-12...

  • Page 33: Theories Of Operation3

    4 THEORIES OF OPERATION Introduction The EW 3001 AC power source consists of 14 main boards and other discrete components. The function of each component is described in the sections below. Description of Overall System Figure 4-1 (on the next page) shows the block diagram of overall system. Main power flows through the A/D, D/D, and D/A power stage through the converter.
  • Page 34 EW 3001 Operation Manual K Board D Board M1 Board Switch-mode Input Power LED Display Keyboard Power Supply 190 ~ 250 V Rotary Encoder & Fan Controller 50/60 Hz I Board BM Board Measure Voltage, AC-DC Current, Power Converter A Board G Board BS Board Full Bridge...

  • Page 35: Ac/Dc Power Stage Converter

    Theories of Operation AC/DC Power Stage Converter The switch -mode PWM converter is composed of a power factor controller and a boost circuit on I board. To avoid the switching losses, the user has to turn on the converter at zero voltage. The auxiliary DC voltages identified as 15V, −15V, 12V, 5V, and −24V are generated on the M1 board.

  • Page 36: Sine Wave Generator

    EW 3001 Operation Manual Sine Wave Generator BS board is identified as the sine wave controller that generates sine waves, and acts as the reference input of D/A stage. Over load protection, which limits the instantaneous output current, is implemented here too. Keyboard and Display The keyboard is designated as K board, which is connected to D board through a short flat ribbon cable.

  • Page 37: Self-Test And Troubleshooting

    This section provides self-test information and suggested troubleshooting procedures to use in the event the EW does not operate properly. If you do not solve the problem using the information given here, contact your Elgar representative or Elgar Customer Service at 800-733-5427, ext. 2295.
  • Page 38 If the unit fails the system test, return it to Elgar for repair. Follow the return procedures outlined on the warranty page at the beginning of this manual. If the unit passes the test, refer...

  • Page 39: Troubleshooting

    Poor Aging of components results in Contact your Elgar representative measurement deviation of characteristics. or Elgar Customer Service at of V, I, P Regular calibration or adjustment 800-733-5427, ext 2295. is required. Over Ambient temperature is too high.

  • Page 41: Remote Operation

    6 REMOTE OPERATION General Information The EW 3001 AC power source can be remotely controlled through the GPIB or the RS-232C interface. It is recommended that the timeout should not be less than one second. For RS-232C interface, only the signals of TXD, RXD, RTS, and CTS can be used for data transfer.

  • Page 42: Gpib Capability Of The Ac Source

    EW 3001 Operation Manual GPIB Capability of the AC Source GPIB Capability Description Interface Functions Talker/Listener Commands and response messages can be sent and AH1, SH1, T6, L4 received over the GPIB. Status information can be read through a serial polling. Service Request The AC power source will set the SRQ line true if there is a condition of enabled service request.

  • Page 43: Numerical Data Formats

    Remote Operation 6.3.2 Numerical Data Formats The EW accepts numerical data of the following formats: Symbol Description Example 123, 0123 Digits with no decimal point. The decimal point is assumed to be to the right of the least-significant digit. Digits with a decimal point. 12.3, .123 Digit with a decimal point and an exponent.

  • Page 44: Boolean Data Format

    EW 3001 Operation Manual 6.3.3 Boolean Data Format The boolean parameter <Boolean> takes the form ON|OFF|<NRf>. Boolean parameter has a value of "0" or "1", and is unitless. Any input value of <NRf> is rounded to an integer and the non-zero result is interpreted as "1".

  • Page 45: Traversal Of The Command Tree

    Remote Operation Program Message: Represents a sequence of zero or more program message unit elements separated by program message unit separator elements. Program Message Unit: Represents a single command, programming data, or query. Examples: VOLT?, OUTPut ON. Program Message Unit Separator (';'): Separates the program message unit elements from one another in a program message.

  • Page 46: Execution Order

    EW 3001 Operation Manual • FREQ 120;VOLT 110 <PMT> will set the frequency to 120Hz and voltage to 110 Volt. Note that FREQ 120 doesn't change the header path to FREQ:CW. • VOLT:LEV 110;RANG 150 <PMT> will set the rms output voltage to 110 Volt and set the output voltage range to 150V range.

  • Page 47: The Commands Of The Ac Source

    Remote Operation The Commands of the AC Source 6.6.1 Command Tree Table MEASure|FETCh [:SCALar] :CURRent :AC? Returns the output AC rms current :CREStfactor? Returns the output current crest factor :FREQuency? Returns the output frequency :POWer [:REAL]? Returns the output real power :PFACtor? Returns the output power factor :VOLTage...
  • Page 48 EW 3001 Operation Manual :AUTO <Boolean> Enables/Disables AUTO output voltage range mode STATus PRESet Presets the PTR, NTR and Enable Registers of Questionable and Operation status :OPERation [:EVENt]? Returns the content of the Event Register :CONDition? Returns the content of the Condition Register :ENABle <NRf>...

  • Page 49: Command Dictionary

    Remote Operation 6.6.2 Command Dictionary MEASure:CURRent:AC? FETCh:CURRent:AC? Description: These queries return the output AC rms current. Note there are two kinds of commands to get measurement data. MEASure commands make new measurement and return measurement data. FETCh commands return measured data taken by previous MEASure command. Note that once a new measurement is made, all new measurement data (V, F, I, P, PF, CF) may be returned by FETCh commands.
  • Page 50 EW 3001 Operation Manual MEASure:POWer:AC? FETCh:POWer:AC? Description: These queries return the output real power. Query Syntax: MEASure[:SCALar]:POWer:AC[:REAL]? FETCh[:SCALar]:POWer:AC[:REAL]? Parameters: None Return Parameters: <NR2> Query Example: MEAS:POW:AC? returns the output real power. MEASure:POWer:AC:PFACtor? FETCh:POWer:AC:PFACtor? Description: These queries return the output power factor. Query Syntax: MEASure[:SCALar]:POWer:AC:PFACtor? FETCh[:SCALar]:POWer:AC:PFACtor?
  • Page 51 Remote Operation Query Syntax: OUTPut[:STATe]? Return Parameters: 0 | 1 Query Example: OUTP? returns the output enable condition. OUTPut:PROTection:CLEar Description: This command clears the latch that disables the output when a short, over current, over power, over temperature, fan fail, or under voltage condition is detected.
  • Page 52 EW 3001 Operation Manual VOLTage Description: This command sets the AC rms output voltage amplitude. The maximum value is dependent on voltage range and the setting of voltage limit. Syntax: [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude] <NRf+> Parameters: 0 to 300 *RST Value: Example: VOLT 110 sets the AC rms output voltage to 110V. Query Syntax: [SOURce:]VOLTage[:LEVel][:IMMediate][:AMPLitude]? Return Parameters: <NR2>...
  • Page 53 Remote Operation VOLTage:RANGe Description: This command sets the output voltage range of the AC power source. Two ranges are available: 150V and 300V range. When setting output voltage to 150V range, if the setting of output voltage is greater than 150V, it will be clamped to 150V.
  • Page 54 EW 3001 Operation Manual STATus:OPERation? Description: This query returns the content of the Operation Event Register. The Operation Event Register is cleared when read or by the *CLS common command. Query Syntax: STATus:OPERation[:EVENt]? Parameters: None Return Parameters: <NR1> STATus:OPERation:CONDition? Description: This query returns the content of Operation Condition Register.
  • Page 55 Remote Operation STATus:QUEStionable? Description: This query returns the content of the Questionable Event Register. The Questionable Event Register latches events that are passed by Questionable PTR and/or NTR filter. It is cleared when read or by the *CLS common command. Query Syntax: STATus:QUEStionable[:EVENt]? Parameters:...
  • Page 56 EW 3001 Operation Manual STATus:QUEStionable:PTRansition Description: These command sets the content of the Questionable NTR (negative transition 1-to-0) and PTR (positive transition 0-to-1) Registers. These Registers determine which type of transition in the Condition Register may set the corresponding bit in the Questionable Event Register. Syntax: STATus:QUEStionable:NTRansition <NRf>...
  • Page 57 Remote Operation SYSTem:REMote Description: This command sets the ac source to remote state, which disables the control of front panel except the local key. Pressing the local key while in the remote state returns the AC power source to the local state. It can only be used with the RS-232C interface.
  • Page 58 AC power source. Query Syntax: *IDN? Parameters: None Return Parameters: Field 1: Manufacturer Field 2: Model Field 3: Serial Number or 0 Field 4: Firmware Level or equivalent Query Example: *IDN? Return Example: ELGAR, EW3001, 0, 0.00 6-18...
  • Page 59 Remote Operation *OPC, Operation Complete Command Description: This command causes the AC power source to set the OPC bit of Standard Event Status Register when all pending operations are completed. Syntax: *OPC Parameters: None *OPC?,Operation Complete Query Description: This query returns an ASCII “1” when all pending operations are completed.
  • Page 60 EW 3001 Operation Manual *SRE, Service Request Enable Command Description: This command sets the content of the Service Request Enable Register, which determines which events of the Status Byte Register are allowed to set the Master Summary Status (MSS) and the Request Service (RQS) message true.

  • Page 61: Status Reporting

    Remote Operation Status Reporting The AC power source follows the status data structure and mechanism described in the IEEE 488.2 Standard Digital Interface for Programmable Instrumentation. Note that undefined bits of all status registers are zero when they are read. 6.7.1 Questionable Status The Questionable Status Registers record signals that indicate abnormal operation of the AC...

  • Page 62: Status Byte Register

    EW 3001 Operation Manual The Standard Event Status Register is cleared at power-on, or when it is read, or by the *CLS common command. The Standard Event Status Enable Register selects which event bits in the Standard Event Status Register may cause the ESB summary-message of the Status Byte Register to be TRUE when it is set.

  • Page 63: Error Messages

    Remote Operation Error Messages As errors are detected, they are placed in a queue of first in first out. The SYSTem:ERRor? query can be used to read back the errors in the queue. If the queue overflows, the last error in the queue will be discarded and replaced with error -350, “Queue overflow”.
  • Page 64 EW 3001 Operation Manual Error No. Description of the Error [description/explanation/examples] −221 Settings conflict [e.g., enable external program mode while the output voltage range is AUTO] −222 Data out of range [e.g., set voltage to 200 Volts while the output voltage range is 150V] −230 Data corrupt or stale −350...

  • Page 65: Appendix: Wire Gauge Selection

    However, these codes consider that up to 5% voltage drop is acceptable. Such a loss directly detracts from the quality performance specifications of the ELGAR instrument. Frequently, these codes do not consider bundles of wire within a cable arrangement.
  • Page 66 EW 3001 Operation Manual Shielded twisted pairs are even better, if needed. Sense lines should be physically separated from high current output, ideally via a separate cable. Sense resistors, if used, should be connected as close as practical to the load. Observe the maximum remote sense voltage drop limit (refer to page A-3).
  • Page 67 Appendix: Wire Gauge Selection The following notes apply to Table A-1 and to the power cable definition: 1. The above figures are based upon insulated copper conductors at 30°C (86°F), two current carrying conductors in the cable plus a safety ground (chassis) plus a shield. Column 2 and Column 3 in the table refer to the "one way"...
  • Page 68 Conductors Capability 3 to 6 6. The preferred insulation material is application dependent. Elgar's recommendation is any flame retardant, heat resistant, moisture resistant thermoplastic insulation rated to a nominal 75°C (240°F). Voltage breakdown must exceed the combined effects of: a) The rated output voltage.

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