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WCL488 Series Water Cooled Electronic Loads

Operation & Programming Manual

TDI-Dynaload Division

Page 22

402828, Rev. B1

Operating Mode Guidelines

CI — Constant Current Mode (Basic Mode)

This mode of operation allows the user to set a fixed current. This set level will not change

regardless of changes in the source voltage. Some power sources such as variable power supplies

are rated at a fixed maximum load current and adjustable over a predetermined voltage range. For

example, 5-30V @ 20A. If the resistive load characteristic were used for this type of a test, it

would be necessary to reset the load each time the power supply voltage was changed in order to

maintain desired load current. However, if the load is in the constant current mode, the current is

constant regardless of input voltage fluctuations.
It should be noted that many power supplies are designed for short circuit protection by internal

current limiting and foldback; therefore, the supply may not start up into a constant current load.

Accordingly, it is suggested that the Constant Resistance mode be used as a load when simulating

short circuit protection and recovery of most power supplies, unless otherwise specified by the

manufacturer.

NOTE:

The constant current mode should never be used to test a constant current source. The

regulation of the two units will fight for control of the current and an unstable oscillation

will result.

CR — Constant Resistance Mode (Basic Mode)

The constant resistance mode regulates the load current in direct proportion to the load voltage.

There are eighteen different resistance ranges available. These are derived from the nine different

voltage and current combinations available, and the two different resistance modes (HIGH and

LOW). The actual resistance values, expressed in Ohms, are outlined in the specification section

of this manual. In general, select the appropriate voltage and current range for the source, and

then determine if the high resistance range or the low resistance range is required. Other ranges

may be selected to tailor the response to a particular application.

EXAMPLE:

Given a 48V source capable of 60A, select the 200V, and 200A ranges. If the high

resistance mode is selected, the maximum current capability is 0.5 Amps/Volt X 48 Volts

= 24 Amps MAX. — Too Low!

Select the low resistance mode: 5 Amps/Volt X 48 Volts = 240 Amps MAX. — sufficient

current capability.

The resolution of the load may be improved by selecting the 400V range. This yields:

2.5 Amps/Volt X 48 Volts = 120 Amps MAX. This provides double the resolution, but it

reduces voltage sensitivity.
NOTE:

The resistance may be entered in Ohms or Amps/Volt (1/R). This option is selected

through the front panel menus.

Содержание TDI-Dynaload WCL488 100-1000-12000

Страница 1: ...WCL488 Series Water Cooled Electronic Loads Operation Programming Manual TDI Dynaload Division Document Number 402828 Revision B1 ...

Страница 2: ...lled and used in accordance with the instruction manual may cause interference to radio communications Operation of this equipment in a residential area may cause harmful interference in which case the user will be required to correct the interference at their expense Trademarks Dynaload is a registered trademark of Transistor Devices Inc Ordering Information The ordering number for this document ...

Страница 3: ...s and Requirements 8 Thermal Transfer Characteristics 8 Special Information for Ethylene Glycol Users 11 WCL488 Typical Rear Panel Connections 12 WCL488 Rear Panel Electrical Connections 13 WCL488 E and E Power Input Buses 13 WCL488 E and E Wiring Tips 13 WCL488 The IEEE 488 Connector RS232 Optional 14 WCL488 AC Input 14 WCL488 Input Voltage Selector 14 WCL488 Fuse Replacement 14 WCL488 AC Input W...

Страница 4: ...rating Mode Guidelines 22 CI Constant Current Mode Basic Mode 22 CR Constant Resistance Mode Basic Mode 22 CV Constant Voltage Mode Basic Mode 23 CP Constant Power Mode Basic Mode 23 Short Circuit 23 MEM Memory Recall Locations 23 Manual Adjust 23 Remote Programming 23 Local Control 24 Fault Indicators 24 Undervoltage Lockout 25 Programmable Under Voltage 25 Menu Commands 26 Current Limit Setting ...

Страница 5: ...ductance On Pulse Loading 31 Effects Of Cable Length 32 Current Oscillation 32 Line Loss 32 Transconductance 34 Location Airflow Maintenance 34 WCL488 WCS Water Cooled Load Systems 35 Synchronized Paralleling 35 Slave Configuration 36 Water Cooled Load Systems Components and Wiring 37 WCS Front Panel Features and Controls 39 WCS Rear Panel Electrical Connections 40 WCS E and E Power Input Buses 40...

Страница 6: ...Data Separators 46 Program Line Terminators 46 Numerical Data Formats 46 Numerical Data Units 46 Power on Defaults 48 Commands 49 Queries 49 Command and Queries Listed Alphabetically 50 Commands and Queries Listed by Category 53 Configuration 53 Identification 53 Limit Control 53 Load Control 53 Operation Modes 54 Pulsing 54 Pulsing Level Parameters 55 Readbacks 55 Slew Rate Commands 55 Status Rel...

Страница 7: ... 64 FQ Frequency 65 I Read Current 65 I1 Constant Current Pulsing Base Level 66 I2 Constant Current Pulsing Peak Level 66 ID Identification 66 IL Current Limit 67 LAT Latch register 68 LOAD Load On Off Control 69 LOCK Front Panel Lock 69 MODE Operating Mode 70 MR Memory Recall 71 MS Memory Save 71 P Read Power 71 P1 Constant Power Pulsing Base Level 72 P2 Constant Power Pulsing Peak Level 72 PL Po...

Страница 8: ...t Mode 83 UV Under Voltage 84 V Read Voltage 84 V1 Constant Voltage Pulsing Base Level 85 V2 Constant Voltage Pulsing Peak Level 86 VER Version 86 VL Voltage Limit 86 WF Waveform 87 XM External Modulation 88 Status and Error Register 89 Glossary 91 Appendix A List of Commands 106 Appendix B List of Queries 107 Appendix C WCL488 Outline Drawings 108 Appendix D WCS Outline Drawings 109 Appendix E Fl...

Страница 9: ...nections 12 Figure 10 WCL488 Rear Panel Detail 13 Figure 11 WCL488 AC Input Fuse and Input Voltage Selector 14 Figure 12 WCL488 UV Switch Detail 16 Figure 13 WCL488 Relay Connector and Chassis Ground Connection 16 Figure 14 WCL488 Terminal Block Detail 17 Figure 15 WCL488 Terminal Block Connections 17 Figure 16 WCL488 Terminal Block Connections Optional Equipment Wiring 20 Figure 17 Slave Bit Iden...

Страница 10: ...able E WCL488 AC Input Power Requirements 14 Table F Major and Minor Fault Indicators 24 Table G Menu Commands 26 Table H Wire Gauge Ampere Rating Reference Table 33 Table I Input Power Requirements 41 Table J Bus Subset Capabilities 45 Table K Numerical Data Formats 46 Table L Numerical Data Units 47 Table M Power on Defaults 48 Equations Equation 1 Establishing Maximum Cable Length 31 Equation 2...

Страница 11: ...r simple upgrade in the field Individual units electrical inputs and water inlet and output connections are located on the rear of each unit Single connections are provided for systems unless otherwise specified Standard features for the WCL488 Series include the following Operation below 1 Volt at 10 000 Amps 50 Volt model only Five modes of operation Constant Current Constant Resistance Constant...

Страница 12: ... servo systems batteries and similar DC sources The WCL488 series provides four basic modes of operation Constant Current Constant Resistance Constant Voltage Constant Power and Pulse Mode Complete control is available through the full feature front panel IEEE 488 bus or optional RS232 interface A 0 10V analog programming input is also available in all of the four modes of operation The connection...

Страница 13: ...rtional to the input voltage This is set in Amps Volt 1 R or ohms Figure 2 Constant Resistance Mode Constant Voltage Mode Referring to Figure 3 the Dynaload will sink the current required to maintain the voltage of the source connected to it Figure 3 Constant Voltage Mode 402825 02 02 CDR V Load Current Slope Resistance Setting Input Voltage I 402825 02 03 CDR Load Current Voltage Setting V I Inpu...

Страница 14: ...witching The WCL488 series provides selection of one of three full scale input voltage ranges and one of three full scale input current ranges The full scale voltage and current ranges may be selected in any combination resulting in nine operational ranges per unit These are selectable over the bus as ranges 1 through 9 refers to IEEE 488 syntax section The selectable ranges provide increased reso...

Страница 15: ... numbers in the table Figure 5 WCL488 Front Panel Features and Controls Table A WCL488 Front Panel Features and Controls Item Number Description 1 AC Power Power On Power Off 2 IEEE 488 Local Select 3 DC Load On Off 4 Pulse Mode Controls RUN Pulse Mode On Off PEAK Sets peak amplitude of pulse FREQ Sets frequency of pulse DUTY CYCLE Sets duty cycle of pulse t LO Sets duration of the low portion of ...

Страница 16: ... Preset up to 10 configurations 16 Mode Select CI Constant Current Mode Select CV Constant Voltage Mode Select CP Constant Power Mode Select CR LOW Constant Resistance Low Ohm Mode Select CR HIGH Constant Resistance High Ohm Mode Select EXT PROG Remote Programming Mode Select SLAVE Slave Detection SHORT Inactive on this product 17 Fault And Warning Status Indicators SYS System Fault Indicator UV U...

Страница 17: ...their definitions Safety symbols are placed to ensure the safety of Dynaload operators and should never be covered or removed from the equipment WARNING Ensure that all AC and DC power for both the load the test source and any peripheral equipment are OFF prior to making any connections to the load Also ensure that the proper AC input range is selected before attaching the line cord and that the l...

Страница 18: ... unsure about your requirements please consult the factory Each master load assembly or slave assembly has one inlet and one outlet water connection They are 1 2 inch NPT female thread A multitude of adapters can be found at your local hardware store if the connection size needs to be changed Do not reduce the water lines below 3 8 inch inner diameter as improper water flow will result If you are ...

Страница 19: ...let Temperature with 10ºC Inlet Outlet Temperature with 10ºC Inlet Power Level Flow Rate 5 kW 8 kW 10 kW 12 kW 3 GPM 22 1ºC 29 8ºC 35 6ºC 37 4ºC 4 GPM 20 3ºC 26 2ºC 30 1ºC 32 3ºC 5 GPM 18 3ºC 22 8ºC 26 7ºC 29 6ºC Maximum Allowed Operating Temperature 12 kW 10 kW 8 kW 5 kW H eatsink Tem pe rature ºC 70 60 50 40 30 20 2 0 3 0 4 0 5 0 6 0 7 0 Flow Rate Gallons Per Minute Water Temperature 10ºC 402828...

Страница 20: ...tlet Temperature with 20ºC Inlet Outlet Temperature with 20ºC Inlet Power Level Flow Rate 5 kW 8 kW 10 kW 12 kW 3 GPM 30 8ºC 38 2ºC 42 5ºC 47 8ºC 4 GPM 28 7ºC 34 5ºC 38 2ºC 42 8ºC 5 GPM 27 2ºC 31 8ºC 35 2ºC 39 3ºC Maximum Allowed Operating Temperature 12 kW 10 kW 8 kW 5 kW H eatsink Te m perature ºC 70 60 50 40 30 20 2 0 3 0 4 0 5 0 6 0 7 0 Flow Rate Gallons Per Minute Water Temperature 20ºC 40282...

Страница 21: ...els Working within the design limitations of 120 PSI it may not be practical to raise the input pressure of the system in order to achieve the required flow rate It is best to use pure water with no additives to reach full power ratings If the use of a high percentage of glycol mix cannot be avoided and acceptable flow rates can not be achieved we suggest the use of a fluid fluid heat exchanger an...

Страница 22: ...n Figure 9 Terminal Block Cover shown installed in Rear View Figure 9 WCL488 Typical Rear Panel Connections Relay control cable 402828 02 03 CDR Computer Digital voltmeter IEEE cable Test source AC input Power cables Fluid outlet Fluid inlet DC disconnect relay Relay connector Water servo WCL488 Rear View WCL488 Top View AC SELECT 250V F3 15 A HIGH CURRENT IEEE IEEE CAUTION HIGH VOLTAGE TIGHTEN SE...

Страница 23: ...ng holes and related hardware found on each of the two input buses located on the left side of the rear of the unit The input buses are separated by an insulator for safety and require lugs with a 7 16 inch diameter hole CAUTION Only the power source to load connections are to be made to these buses Always be sure these connections are securely tightened A loose connection will result in a high te...

Страница 24: ... The operational frequency range is 47Hz 63Hz Figure 11 WCL488 AC Input Fuse and Input Voltage Selector WCL488 Input Voltage Selector The Input Voltage Selector refer to Figure 11 is mounted on the rear panel immediately above the AC input and fuse assembly WARNING Ensure that the power cord is removed before making changes to the voltage selector tab WCL488 Fuse Replacement Referring to Figure 11...

Страница 25: ...s Connect the AC cord first to your Dynaload and THEN to the utility outlet WCL488 Slave Communication Connector This DB25 D connector is located in the upper right corner of the rear panel and is used for synchronized parallel Dynaload operation see Figure 10 This connector is labeled SLAVE COMMUNICATION NOTE There are no user signals or inputs in this connector WCL488 Slave Communication Connect...

Страница 26: ...s FL pin provides the control signal for the water servo valve Figure 13 WCL488 Relay Connector and Chassis Ground Connection WCL488 Chassis Ground Connection Referring to Figure 13 above the chassis ground connection is used to ground the third wire of 402828 02 09 CDR AC SELECT 25 0 V F3 15 A HIGH CURRENT IEEE IEEE TIGHTEN SECURELY FLUID INLET RELAY SLAVE COMMUNICATION FL GND FLUID OUTLET OFF ON...

Страница 27: ...his signal is a true representation of the current level and waveform being generated by the load Connect an oscilloscope or other external instruments to this terminal as monitoring devices The instruments should be referenced to terminal S Shielded wire is recommended For local voltage sensing connect S to E and connect S to E Factory installed jumpers are provided the positive and negative inpu...

Страница 28: ...ithout damage to the load When not in pulse mode this output remains high until a current change is executed At this time the output is pulsed low for scope triggering EN Remote Enable The EN Remote Enable terminal is the remote DC enable Connection between EN and S must be connected in order to turn the DC on This input is typically used for remote Emergency Power Off EPO operation of the DC on o...

Страница 29: ...voltage sense wires are connected to the power source terminals This will eliminate potential errors due to voltage drop in the cable It is also recommended to use shielded wire for remote voltage sense leads to prevent external noise from being introduced into the system In a master slave parallel configuration S must only be connected to the E source at the master Dynaload The D connector cable ...

Страница 30: ...lude various optional equipment to the Dynaload In the example shown in Figure 16 an oscilloscope function generator and remote DC ON OFF switch are shown installed to the Dynaload Figure 16 WCL488 Terminal Block Connections Optional Equipment Wiring Remove E and E jumpers for remote voltage sensing Connect to source C S R EM SYN EN S S E S E 402828 02 11 CDR Oscilloscope Function Generator Remote...

Страница 31: ...fore applying AC or DC voltages to the load 6 Turn on AC power meters should come on and fan should run 7 Step through the Menu settings to be sure the set points are appropriate to the application Check to see that the voltage and current ranges selected are correct 8 Press the DC ON button or send the LOAD ON command via the IEEE controller This will close the relays and connect the source to th...

Страница 32: ...ld never be used to test a constant current source The regulation of the two units will fight for control of the current and an unstable oscillation will result CR Constant Resistance Mode Basic Mode The constant resistance mode regulates the load current in direct proportion to the load voltage There are eighteen different resistance ranges available These are derived from the nine different volt...

Страница 33: ...current level inversely in response to a change in voltage The constant power mode is NOT affected by changes of the voltage or current range CAUTION If the source voltage decays to zero volts the load will attempt to draw infinite current Short Circuit Due to the intended use and power levels involved Short Circuit is not available on WCL or WCS products MEM Memory Recall Locations The configurat...

Страница 34: ...y the controlling computer By pressing the LOCAL button a second time the unit will return to IEEE control This key will not function if password lockout is enabled See section on password protection Password Change later in this chapter NOTE A controlling computer program must be stopped before local control will function The Dynaload always selects computer control over local control Any command...

Страница 35: ...engage and the SYS fault LED will extinguish when the input voltage goes over 0 4 volts but the UV fault indication remains until cleared with the LOAD ON command over the IEEE bus or by depressing the DC ON button on the front panel When the UV switch is in the OFF position this action is inhibited allowing for load operation under 0 4 volts This function is separate and distinct from the program...

Страница 36: ...r in appearance The subsections in this section detail each of the menu commands Referring to Table G the menu features are as follows Table G Menu Commands Number Menu Command 1 Current Limit Setting 2 Voltage Limit Setting 3 Power Limit Setting 4 Slew Rate Adjust 5 IEEE Address Setting 6 SF SS Fast Slew Slow Slew 7 Front Panel Configuration Memory Set 8 I Offset 9 V Offset 10 Encoder Resolution ...

Страница 37: ...alarm condition will be indicated and will be a MAJOR FAULT The load will not reconnect until the input voltage is below the limit set point When prompted press ENTER to select the function then enter the numeric value using the keypad and press ENTER Power Limit Setting The power limit function acts as a brick wall The load will not permit the power level to exceed the numeric set point If the vo...

Страница 38: ...E 488 primary address must be set through the front panel numeric keypad When prompted press ENTER to select this function enter the numeric address you wish the load to respond to and press ENTER Password Change Through this screen the user can enter a password When prompted press ENTER Then enter the new password This is a numeric entry Then press ENTER The maximum number of characters is seven ...

Страница 39: ...e load automatically stop loading when the input Voltage drops below a specified threshold If the input Voltage level drops below the UV setting the load will disconnect from the source A UV and MAJOR FAULT will be indicated The load will not reconnect until a DC LOAD ON command is issued When prompted press ENTER to select the function Then enter the numeric value using the keypad and press ENTER...

Страница 40: ...commended to monitor the current sample output with an oscilloscope to observe the actual current amplitude and waveform If waveforms other than square waves are required this can be accomplished by programming the loads using an external analog program source refer to the Remote Programming section that follows NOTE In constant voltage mode the load current is increased by lowering the voltage Th...

Страница 41: ...microhenry The inductive drop cannot exceed the difference between the source voltage and the minimum compliance EXAMPLE Referring to Equation 1 that follows to test a 10V source with a 100A pulse and assuming a 3 Volt minimum compliance the maximum cable length would be Equation 1 Establishing Maximum Cable Length In the example above the maximum cable length is equal to 8 4 feet total or 4 2 fee...

Страница 42: ... this situation occurs refer to the Effects of Cable Inductance On Pulse Loading section earlier in this chapter Line Loss If the Dynaload is not configured for remote voltage sensing the voltage display and voltage readback will reflect what may appear to be an erroneous number The voltage display will indicate the voltage present at the input terminals This number will be affected by the current...

Страница 43: ...24 1 0 1 6 0 81 22 9 5 1 6 2 5 1 28 20 11 7 5 2 5 4 0 3 2 04 18 16 10 6 4 0 6 0 5 3 24 16 22 13 10 6 0 10 0 7 5 16 14 32 17 20 10 0 16 0 15 8 22 12 41 23 30 16 0 26 0 20 13 05 10 55 33 35 25 20 8 8 73 46 58 36 50 35 33 0 6 101 60 86 51 70 50 52 6 4 135 80 108 64 90 70 83 4 2 181 100 149 82 125 90 132 8 1 211 125 177 105 150 100 167 5 0 245 150 204 125 200 125 212 0 00 283 175 237 146 225 150 266 0...

Страница 44: ...el while operating at current levels greater than 10 of the full current rating of the load If the baseline current is greater than 10 of full scale current and the pulsed waveform is added above this baseline the effects of transconductance will be eliminated The greatest distortion occurs when pulsing from a zero current baseline NOTE Range switching will have no effect on operation in the trans...

Страница 45: ... on the master to operate Therefore do not attempt to operate the slave units without a master control unit The WCS System is designed to automatically detect the presence of the slave units In operation the control display on the master will indicate the total system rating based on number of slave units detected The voltage and current ranges selected will also be taken into account and reflecte...

Страница 46: ...no two slaves are set to the same number Having two slaves set to the same number will confuse the master and it will not identify the second slave unit Figure 17 Slave Bit Identifier Switches The master unit will detect all slaves present and self configure to reflect the full system rating The master will report all system conditions that is current and power levels and all alarms including slav...

Страница 47: ... Wiring The main components of Water Cooled Load Systems are as follows Main servo unit DC relay master Relay master load Relay slave load Water shutoff valve master Water shutoff valve one per slave Optional water shutoff override switch momentary To better understand the various components and related wiring of Water Cooled Load Systems refer to Figure 18 ...

Страница 48: ...stems Wiring Diagram FL 402828 02 04 CDR Main servo unit Optional water shutoff override switch mom entary Water shutoff valve one per slave Water shutoff valve master Relay slave load Relay master load DC relay master W hite Red Black Red 1 Red 2 NO COM NC E TB NOTE Water shutoff valves do not have polarity Red 1 Red 2 Diode IN4007 two per valve ...

Страница 49: ...r Switch The switch powers the WCS unit ON and OFF Status Indicators AC ON indicates that the WCS unit is powered on DC ON indicates that the WCL488 is powered on and sending control information for use by the slave units Major and Minor Fault Indicators These indicators are discussed in detail in the Fault Indicators section later in this chapter Current Range Indicators These indicate the curren...

Страница 50: ...th a 7 16 inch diameter hole CAUTION Only the power source to load connections are to be made to these buses Always be sure these connections are securely tightened A loose connection will result in a high temperature at the connection WCS E and E Wiring Tips It is the best practice to join the power buses together and run a single conductor set from the ganged inputs to the source under test The ...

Страница 51: ...ector The Input Voltage Selector refer to Figure 21 is mounted on the rear panel immediately above the AC input and fuse assembly NOTE Each WCS slave Input Voltage Selector MUST be set the same as the master WCL488 WARNING Ensure that the power cord is removed before making changes to the voltage selector tab WCS AC Input Wiring Tips A standard U S three prong cord is provided with your Dynaload T...

Страница 52: ... or equivalent OR GDC 3 15A 250V 3 15 Amp 250 Volt slow blow 20 mm European version or equivalent WCS Slave Communication Connector This DB25 D connector is located in the upper right corner of the rear panel and is used for synchronized parallel Dynaload operation see Figure 20 This connector is labeled SLAVE COMMUNICATION WCS Slave Communication Connector Wiring This 25 pin D connector is used t...

Страница 53: ...ctor see Figure 13 and Figure 18 on page 38 this connector does not have an FL pin which on a WCL488 or master unit controls the water servo Figure 23 WCS Relay Connector and Chassis Ground Connection 25 0V HIGH CURRENT TIGHTEN SECURELY AC SELECT F 3 15 A OFF ON UV FLUID OUTLET RELAY FLUID INLET GND A3 SLAVE ADDR O N A0 A2 A 1 A9 A8 A7 A6 A4 A5 SLAVE COMMUNICATION 402828 02 17 CDR Relay connector ...

Страница 54: ...ust be placed the OFF position IMPORTANT You must be sure that no two slaves are set to the same number Having two slaves set to the same number will confuse the master The master will not identify the second slave unit and system errors will occur Figure 24 WCS Slave Bit Identifier Switches The master unit will detect all slaves present and self configure to reflect the full system rating The mas...

Страница 55: ...s the IEEE 488 bus subset capabilities indicated in Table J Table J Bus Subset Capabilities Subset Category Response Acceptor Handshake AH1 Full capability the load can generate the handshake for receiving data Source Handshake SH1 Full capability the load can generate the handshake for transmitting data Talker T6 The load can A Transmit data B Not be a talker and a listener at the same time C Res...

Страница 56: ... or as a carriage return only by following the IEEE 488 bus configuration procedure Numerical Data Formats The programmable Dynaload accepts the two numerical data formats listed below see Table K These are described in more detail in IEEE Standard 488 2 Standard Digital Interface for Programmable Instruments Table K Numerical Data Formats Symbol Data Form s NR1 Digits with no decimal point The de...

Страница 57: ...Ω ohms Ohms CRL Constant resistance setpoint Low Ω ohms Ohms CV Constant voltage setpoint Volts Volts DU Square wave duty cycle Percent FQ Square wave frequency Hertz Hz I Load current Amperes Amps I1 First current value Amperes Amps I2 Second current value Amperes Amps P Load power Watts Watts P1 First power value Watts Watts P2 Second power value Watts Watts R1 First resistance value ohms mode O...

Страница 58: ...onstant resistance setpoint CV Constant voltage setpoint Vmax DU Square wave duty cycle 50 FQ Square wave frequency 1000 Hz I1 First current value 0 I2 Second current value 0 IL Current limit 105 of full scale LOAD Relay Open MODE Mode Constant current P1 First power value 0 P2 Second power value 0 PL Power limit 105 of full scale R1 First resistance value R2 Second resistance value RNG Range High...

Страница 59: ...mands followed by a question mark are queries When received by the Dynaload the appropriate information is stored for reading by the IEEE 488 bus controller It is important to note that the results of a query must be read back before sending another command to the Dynaload If this is not the case the information requested is lost There are two categories of queries One is a request for real time l...

Страница 60: ...tant Power setting CR Read Constant Resistance setting CRH NR2 Set Constant Resistance High mode CRL NR2 Set Constant Resistance Low mode CV NR2 Set Constant Voltage mode CV Read Constant Voltage setting DU NR2 Set Duty Cycle DU Read Duty Cycle setting ERR Read Error Register FQ NR2 Set Frequency FQ Read Frequency Setting I Read Current I1 NR2 Set Constant Current pulse base level I1 Read Constant...

Страница 61: ...tant Resistance pulse base level R1 Read Constant Resistance pulse base setting R2 NR2 Set Constant Resistance pulse peak level R2 Read Constant Resistance pulse peak setting RNG NR1 Set Voltage Current Range RNG Read Voltage Current Range status RST Reset SBE NR1 Set Summary Bit Enable register SBE Read Summary Bit Enable register SDN NR1 Set Shutdown register SDN Read Shutdown register SF Set fo...

Страница 62: ...Voltage V1 NR2 Set Constant Voltage pulse base level V1 Read Constant Voltage pulse base level V2 NR2 Set Constant Voltage pulse peak level V2 Read Constant Voltage pulse peak level VER Read software version string VL NR2 Set Voltage Limit VL Read Voltage Limit setting WF NR1 Set Square Wave pulsing on WF OFF Set Square Wave pulsing off XM ON Set External Modulation on XM OFF Set External Modulati...

Страница 63: ...ad Shutdown register TEXT OFF Set numeric query responses TEXT ON Set descriptive query responses TEXT Read Text on off setting Identification ID Read Identification string VER Read software version string Limit Control IL NR2 Set Current Limit IL Read Current Limit Setting PL NR2 Set Power Limit PL Read Power Limit setting UV NR2 Set programmable Under Voltage UV Read programmable Under Voltage s...

Страница 64: ...igh mode CRL NR2 Set Constant Resistance Low mode CV NR2 Set Constant Voltage mode CV Read Constant Voltage setting MODE Read mode XM ON Set External Modulation on XM OFF Set External Modulation off XM PLUS NR2 Set External Modulation with programmed offset XM NR2 Alternate Syntax for XM PLUS NR2 XM Read External Modulation setting Pulsing DU NR2 Set Duty Cycle DU Read Duty Cycle setting FQ NR2 Se...

Страница 65: ...g P1 NR2 Set Constant Power pulse base level P1 Read Constant Power pulse base setting P2 NR2 Set Constant Power pulse peak level P2 Read Constant Power pulse peak setting R1 NR2 Set Constant Resistance pulse base level R1 Read Constant Resistance pulse base setting R2 NR2 Set Constant Resistance pulse peak level R2 Read Constant Resistance pulse peak setting V1 NR2 Set Constant Voltage pulse base...

Страница 66: ... register ERR Read Error Register LAT NR2 Set the fault Latch register LAT Read the Latch register setting SBE NR1 Set Summary Bit Enable register SBE Read Summary Bit Enable register SDN NR1 Set Shutdown register SDN Read Shutdown register SRQ NR1 Set Service Request register SRQ Read Service Request register STA Read Status register Miscellaneous RST Reset ...

Страница 67: ...SYNTAX Shows the proper form s of the command Spaces are optional as the command processor ignores these EXAMPLE Gives an example of command usage QUERY SYNTAX Provides the proper query form RETURNED PARAMETERS Indicates the response format s to the query form of the command Where the TEXT ON and TEXT OFF modes responses differ both will be indicated AV1 Amps Volt Pulsing Base Level Description Th...

Страница 68: ...0 This will set the peak level to 50 Amps per Volt above the base level Therefore if the base level setting is 25A the peaks will be 75 Amps per Volt Query Syntax AV2 Returned Parameters TEXT ON NR2 amps v TEXT OFF NR2 AV See query form of AVH and AVL that immediately follow AVH Amps Volt High Description This command places the load into Amps Volt High mode at the specified level Command Syntax A...

Страница 69: ...L 2 5 This will place the load in Amps Volt Low mode at 2 5 Amps per Volt Query Syntax AV Returned Parameters TEXT ON NR2 amps v TEXT OFF NR2 CI Constant Current Set Constant Current mode and current value Description This command places the load into Constant Current mode at the specified level Command Syntax CI NR2 Example CI 10 5 This will place the load in Constant Current at 10 5 Amps Query S...

Страница 70: ...pective bit in the Shutdown SDN register is set the load will shutdown The returned value will be between 0 and 255 and is the sum of the individual bit weights The individual bits are defined below Bit Weight Description Text On Response Message 7 128 Under Voltage UNDER VOLTAGE 6 64 Over Voltage VOLTAGE LIMIT 5 32 Over Temperature TEMPERATURE LIMIT 4 16 3 8 Over Current CURRENT LIMIT 2 4 Over Po...

Страница 71: ... place the load in Constant Power at 20 Amps Query Syntax CP Returned Parameters TEXT ON NR2 watts TEXT OFF NR2 CR See query form of CRH and CRL that immediately follow CRH Constant Resistance High Description This command places the load into Constant Resistance High mode at the specified level Command Syntax CRH NR2 Example CRH 100 0 This will place the load in Constant Resistance High mode at 1...

Страница 72: ...mmand Syntax CRL NR2 Example CRL 1 5 This will place the load in Constant Resistance Low mode at 1 5 Ohms Query Syntax CR Returned Parameters TEXT ON NR2 ohms TEXT OFF NR2 CV Constant Voltage Description This command places the load into Constant Voltage mode at the specified level Command Syntax CV NR2 Example CV 100 0 This will place the load in Constant Voltage at 100 Volts Query Syntax CV Retu...

Страница 73: ...ing This defines the percentage of peak pulse time and will set the Pulsing Base Time T1 and Pulsing Peak Time T2 accordingly based upon the defined frequency Command Syntax DU NR2 Example DU 40 0 This will set the duty cycle to 40 If the frequency was 100Hz meaning a pulse period of 10 000µs T2 will be set to 4000µs and T1 will be set to 6000µs Query Syntax DU Returned Parameters TEXT ON NR2 TEXT...

Страница 74: ... individual bit weights as defined below Bit Weight Description Text On Response Message 7 128 6 64 5 32 Command not allowed NOT ALLOWED 4 16 Command too long TOO LONG 3 8 Numeric Error NUMERIC 2 4 1 2 Out of Range RANGE 0 1 Unrecognized Command UNRECOGNIZED Description The text response will return a string containing the Text On Response Message as listed above for each bit that is set These wil...

Страница 75: ...adjusted accordingly based upon the defined duty cycle Command Syntax FQ NR2 Example FQ 1000 0 This will set the frequency to 1000Hz If the duty cycle was 30 T2 will be set to 300µs and T1 will be set to 700µs Query Syntax FQ Returned Parameters TEXT ON NR2 Hz TEXT OFF NR2 I Read Current Description This query returns the actual current reading in Amps passing through the load Command Syntax NONE ...

Страница 76: ...el Description This command is used to set the peak level relative to the base level when pulse loading in the Constant Current mode Command Syntax I2 NR2 Example I2 25 0 This will set the peak level to 25 Amps above the base level Therefore if the base level setting is 10 5A the peaks will be 35 5 Amps Query Syntax I2 Returned Parameters TEXT ON NR2 amps TEXT OFF NR2 ID Identification Description...

Страница 77: ... 67 IL Current Limit Description This command is used to set the Current Limit set point The Current Limit circuit will not allow the load current to exceed this level Command Syntax IL NR2 Example IL 50 0 This will set the Current Limit to 50 Volts Query Syntax IL Returned Parameters TEXT ON NR2 amps TEXT OFF NR2 ...

Страница 78: ...scription Text On Response Message Default Value 7 128 Under Voltage UV 0 6 64 Over Voltage OV 0 5 32 Over Temperature OT 0 4 16 0 3 8 Over Current OC 0 2 4 Over Power OP 0 1 2 Saturation SAT 0 0 1 Module Fault MOD FLT 0 Description The query form of this command will either return a numeric or a text response depending on the TEXT ON OFF setting The text response will return a string containing t...

Страница 79: ...tart loading the device under test at the programmed settings LOAD OFF This will open the load connect relay and stop loading Query Syntax LOAD Returned Parameters TEXT ON TEXT OFF LOAD ON LOAD OFF 1 meaning On 0 meaning Off LOCK Front Panel Lock Description This command is used to lock or unlock the load s front panel When locked manual operation through the load s front panel is inhibited Comman...

Страница 80: ...odes Bit Weight Description Text On Response Message 6 64 Slave Mode SLAVE 5 32 Constant Amps Volt High CONSTANT AMPS VOLT HIGH 4 16 Constant Amps Volt Low CONSTANT AMPS VOLT LOW 3 8 Constant Resistance High CONSTANT RESISTANCE HIGH 2 4 Constant Resistance Low CONSTANT RESISTANCE LOW 1 2 Constant Power CONSTANT POWER 0 1 Constant Voltage CONSTANT VOLTAGE Default Constant Current CONSTANT CURRENT D...

Страница 81: ... Syntax NONE Returned Parameters N A MS Memory Save Description This command saves the load s setup into the specified memory location The memory location number must be a value from 1 through 9 Command Syntax MS NR1 Example MS 3 This will store the load s current setup in memory location 3 Query Syntax NONE Returned Parameters N A P Read Power Description This query returns the computed load powe...

Страница 82: ...ion This command is used to set the peak level relative to the base level when pulse loading in the Constant Power mode Command Syntax P2 NR2 Example P2 20 0 This will set the peak level to 20 Watts above the base level Therefore if the base level setting is 25 3 the peaks will be 45 3 Watts Query Syntax P2 Returned Parameters TEXT ON NR2 watts TEXT OFF NR2 PL Power Limit Description This command ...

Страница 83: ...1 Returned Parameters TEXT ON NR2 ohms TEXT OFF NR2 R2 Constant Resistance Pulsing Peak Level Description This command is used to set the peak level relative to the base level when pulse loading in the Constant Resistance mode This resistance will be applied in parallel to the base resistance NOTE CRH or CRL must have been previously set Command Syntax R2 NR2 Example R2 1 1 This will set the peak ...

Страница 84: ...h High 2 Medium High 3 Low High 4 High Medium 5 Medium Medium 6 Low Medium 7 High Low 8 Medium Low 9 Low Low Description The Query form of this command returns actual operating range The text response to a query will be a string specifying the Voltage and current ranges The numeric response will be the range number Command Syntax RNG NR1 Example RNG 2 This will set the load to the medium Voltage a...

Страница 85: ...on Programming Manual 402828 Rev B1 Page 75 RST Reset Description This command resets the load to its factory default power on settings Command Syntax RST Example RST This will reset the load to its factory default power on settings Related Query NONE Returned Parameters N A ...

Страница 86: ...nse Message Default Value 7 128 Under Voltage UV 1 6 64 Over Voltage OV 1 5 32 Over Temperature OT 1 4 16 0 3 8 Over Current OC 1 2 4 Over Power OP 1 1 2 Saturation SAT 1 0 1 Module Fault MOD FLT 1 Description The query form of this command will either return a numeric or a text response depending on the TEXT ON OFF setting The text response will return a string containing the Text On Response Mes...

Страница 87: ...ge UV 0 6 64 Over Voltage OV 1 5 32 Over Temperature OT 1 4 16 0 3 8 Over Current OC 0 2 4 Over Power OP 0 1 2 Saturation SAT 0 0 1 Module Fault MOD FLT 0 Description The query form of this command will either return a numeric or a text response depending on the TEXT ON OFF setting The text response will return a string containing the Text On Response Message as listed in the table above for each ...

Страница 88: ...TE Maximum slew rate is highly dependent on factors including power source source to load wiring and operating mode Command Syntax SF Example SF Sets the slew rate limiter to the fast range Query Syntax NONE Returned Parameters NONE SR Slew Rate Description This command is used to set both the rise and fall time in microseconds for a full scale transition within the selected range Command Syntax S...

Страница 89: ...gle Shot Complete SINGLE SHOT COMPLETE 4 16 Command Error COMMAND ERROR 3 8 Minor Fault MINOR FAULT 2 4 Major Fault MAJOR FAULT 1 2 System Minor Fault SYSTEM MINOR 0 1 System Major Fault SYSTEM MAJOR Description The query form of this command will either return a numeric or a text response depending on the TEXT ON OFF setting The text response will return a string containing the Text On Response M...

Страница 90: ...imiter to the slow range In the slow range full scale rise and fall times can be programmed between 1 000µs and 400 000µs using the SR S1 or S2 commands NOTE Maximum slew rate is highly dependent on factors including power source source to load wiring and operating mode Command Syntax SS Example SS Sets the slew rate limiter to the slow range Query Syntax NONE Returned Parameters NONE ...

Страница 91: ...Bit Weight Description Text On Response Message 7 128 Reserved RESERVED 6 64 Change In Status STA CHANGE 5 32 Single Shot Complete SINGLE SHOT COMPLETE 4 16 Command Error COMMAND ERROR 3 8 Minor Fault MINOR FAULT 2 4 Major Fault MAJOR FAULT 1 2 System Minor Fault SYSTEM MINOR 0 1 System Major Fault SYSTEM MAJOR Description The text response will return a string containing the Text On Response Mess...

Страница 92: ...nd Syntax SW NR1 SW OFF Example SW This will turn on Square Wave pulsing until explicitly turned off SW 50 This will turn on Square Wave pulsing for 50 pulses and then return to the base drive level SW OFF This will turn off Square Wave pulsing Query Syntax NONE Returned Parameters NONE T1 Pulsing Base Time Description This command is used to directly set the base time in microseconds for square w...

Страница 93: ... T2 NR1 Example T2 4000 This will set the pulse base time to 4000µs If T1 were 6000µs the duty cycle DU would be 40 and frequency would be 100Hz Query Syntax T2 Returned Parameters TEXT ON NR1 us TEXT OFF NR1 TEXT Text Mode Description This command is used to turn on or off the descriptive responses that are available on many queries Command Syntax TEXT ON TEXT OFF Example TEXT ON This will turn o...

Страница 94: ... SDN register Command Syntax UV NR2 Example UV 9 6 This will set the Programmable Under Voltage to 9 6 Volts The load will shutdown if the Voltage on its input terminals drops below this threshold UV 0 This will disable the Programmable Under Voltage feature Query Syntax UV Returned Parameters Text On NR2 volts Text Off NR2 V Read Voltage Description This query returns the actual Voltage in Volts ...

Страница 95: ... command is used to set the base level when pulse loading in the Constant Voltage mode NOTE When pulsing in constant voltage mode higher voltage corresponds to less drive Therefore V1 is a higher value than V2 Command Syntax V1 NR2 Example V1 75 0 This will set the base Constant Voltage level to 75 0 Volts Query Syntax V1 Returned Parameters TEXT ON NR2 volts TEXT OFF NR2 ...

Страница 96: ...the peak level to 24 3 Volts below the base level Therefore if the base level setting is 75 0 the peaks will be 50 7 Volts Query Syntax V2 Returned Parameters TEXT ON NR2 volts TEXT OFF NR2 VER Version Description This query returns the load s firmware version as a variable length alphanumeric string Command Syntax NONE Example N A Query Syntax VER Returned Parameters version string VL Voltage Lim...

Страница 97: ...ility with other model types Supplying the optional parameter sets the number of pulses that will be generated The load will automatically return to the base drive level when the set number of pulses has completed Command Syntax WF NR1 WF OFF Example WF This will turn on Square Wave pulsing until explicitly turned off WF 50 This will turn on Square Wave pulsing for 50 pulses and then return to the...

Страница 98: ...used as well In any mode other than Constant Current the offset specification will be ignored The query form of this command returns only the XM ON OFF status The digitally programmed current offset issued with a XM PLUS or XM command can be read back using either a CI or I1 query Command Syntax XM ON XM OFF XM PLUS NR2 or XM NR2 Example XM ON This will place the load in Remote Programming mode XM...

Страница 99: ...f the load Two of the registers the fault shutdown mask SDN and the fault latch mask LAT control which of the condition register bits cause a load shutdown shutdown mask and or are latched until read latch mask The summary bit enable SBE register controls that condition bits are passed through to the system status register STA The system status register is available either in response to an STA qu...

Страница 100: ...D S yste m M ajo r S yste m M ino r M ajo r F ault M ino r F ault C o m m a nd E rror S ingle S h ot C o m p lete C han ge in S tatu s R e se rve d 7 6 5 4 3 2 1 0 U V O V O T G P IB O C O P S AT M O D 7 6 5 4 3 2 1 0 0 0 0 0 0 0 0 0 7 6 5 4 3 2 1 0 U V 1 1 G P IB O C O P S AT M O D F au lt S hu tdo w n M ask co ntrols w hich bits in C O N cause a sh otd ow n SD N La tch ed F a ult M a sk co ntro ...

Страница 101: ...nal into a digital value Alternating Current Electric current that rises to a maximum in one direction falls back to zero and then rises to a maximum in the opposite direction and then repeats Ammeter Instrument for measuring the current in amps milliamps or microamps Ampere Also referred to as an Amp The unit of electrical current represented by the symbol A Amplitude The highest value reached by...

Страница 102: ...lector and emitter regions of a transistor Battery DC voltage source containing two or more cells that convert chemical energy to electrical energy Baud Unit of signaling speed equal to the number of signal events per second Binary System based on the number 2 The binary digits are 0 and 1 Binary Coded Decimal Code for representing decimal digits in a binary format Also referred to as BCD Bit Bina...

Страница 103: ...lectrical energy Chassis Metal box or frame into which components are mounted Chassis Ground Connection to a chassis Choke Inductor designed to present a high impedance to alternating current Circuit Interconnection of components to provide an electrical path between two or more components Circuit Breaker Protective device used to open a circuit when current is greater than a maximum value A circu...

Страница 104: ...lectrical equipment Digital Electronics Branch of electronics dealing with information in binary form Distortion Amount by which a circuit or component fails to accurately reproduce the characteristics of the input Duplex Transmission Ability to both send and receive data at the same time over the same communications line E Earth Ground Connection to the earth itself or the negative lead to a chas...

Страница 105: ...reaks when current is over a predetermined maximum value G Gain Ratio of the output level of a circuit to the input GFCI Ground Fault Circuit Interrupt Used for AC convenience outlets to provide maximum personal protection from electrical shock A GFCI is not suitable for use with certain portable test equipment Ground A large conducting body such as the earth or an electric circuit connected to th...

Страница 106: ...o one cycle per second I Impedance Impedance is similar to resistance but applies to alternating current circuits and is measured in ohms represented by the symbol Z Input The part of a circuit that accepts a signal for processing Insulator Material that resists the flow of current Interface Usually the hardware that provides communication between various items of equipment using common physical i...

Страница 107: ...ircuit or device that prevents some portion of its input from reaching the output Line Regulation Ability of a voltage regulator to maintain a constant voltage when the regulator input voltage varies Load Component or piece of equipment connected to a source and draws current from a source is a load on that source Load Current Current drawn from a source by a load Load Impedance Sum of reactance a...

Страница 108: ...lating layer between the gate electrode and the channel Also referred to as an insulated gate field effect transistor Multimeter Electronic test equipment that can perform multiple tasks such as measuring AC and DC voltage current and resistance A digital multimeter is often referred to as a DVM Multiplexer Device that sends messages or signals simultaneously using a multiplex system Mutual Induct...

Страница 109: ... Open Circuit Circuit having an incomplete path for current flow Oscilloscope Electronic instrument that produces an instantaneous trace on the screen of a cathode ray tube corresponding to oscillations of voltage and current Output Part of a circuit where the processed signal is available Output Impedance Impedance measured at the output terminals of a device without a load connected Output Power...

Страница 110: ...minology used to describe positive and negative charges Polarized Component that must be connected in correct polarity to function and or prevent destruction Power The amount of energy converted by a circuit or component in a specific unit of time normally seconds Measured in watts Power Factor The ratio of actual power to apparent power Power Loss The ratio of power absorbed to power delivered Po...

Страница 111: ...nt passing through it resulting in a change of electrical energy into heat or another form of energy Resistor Passive component with a known resistance Rheostat Variable resistor used to control current S Schematic Structural or procedural diagram of an electrical or electronic circuit with the components represented by symbols Also see Circuit Diagram Semiconductor Any of various solid crystallin...

Страница 112: ... or conducts away heat from a circuit Source A device that provides signal power or energy to a load Spike A brief and sudden change usually an increase in the voltage on a power line A surge is similar to a spike but is of longer duration Step Down Transformer A transformer in which the output AC voltage is less than the input AC voltage Step Up Transformer A transformer in which the output AC vo...

Страница 113: ...ystem or piece of equipment Thermistor Resistor that varies according to temperature Three Phase Supply AC power supply that has three AC voltages 120 out of phase with each other Threshold Minimum point at which an effect is produced or detected Transducer Device that receives energy in one form and supplies an output in another form Transformer An inductor with two or more windings Transformer C...

Страница 114: ...ned for use in such an environment In safety terms for example UL a building or space in a building that is accessible by untrained personnel UPS Uninterruptible Power Supply V VA Volt Ampere VFC Voltage To Frequency Converter Device that converts an analog input voltage into a sequence of digital pulses Volt Unit of voltage Volt ampere A unit of electric power equal to the product of one volt and...

Страница 115: ... Unit of power One watt is the product of one volt and one amp represented by the symbol W Wattage An amount of power especially electric power expressed in watts or kilowatts Also the electric power required by an appliance or a device Wattage Rating The maximum amount of power a device can continuously safely handle X Z X ON X OFF Transmitter On Transmitter Off Used for flow control instructing ...

Страница 116: ...2 LOCK OFF SW NR1 AV2 NR2 LOCK ON SW OFF AVH NR2 MR NR1 T1 NR2 AVL NR2 MS NR1 T2 NR2 CI NR2 P1 NR2 TEXT OFF CP NR2 P2 NR2 TEXT ON CRH NR2 PL NR2 UV NR2 CRL NR2 R1 NR2 V1 NR2 CV NR2 R2 NR2 V2 NR2 DU NR2 RNG NR1 VL NR2 FQ NR2 RST WF NR1 I1 NR2 SBE NR1 WF OFF I2 NR2 SDN NR1 XM OFF IL NR2 SF XM LAT NR2 SR NR2 XM PLUS NR2 LOAD OFF SRQ NR1 XM NR2 LOAD ON SS ...

Страница 117: ...r Cooled Electronic Loads Operation Programming Manual 402828 Rev B1 Page 107 Appendix B List of Queries AV1 ID SDN AV2 IL SR AV LAT SRQ CI LOAD STA CON LOCK T1 CP MODE T2 CR P1 UV CV P2 V1 DU P V2 ERR PL V FQ R1 VER I1 R2 VL I2 RNG XM I SBE ...

Страница 118: ...ronic Loads Operation Programming Manual TDI Dynaload Division Page 108 402828 Rev B1 Appendix C WCL488 Outline Drawings 402828 02 19 C D R Front View R ear View Top View Side View W eig ht 68 po un ds w ithou t extern al a ccessories ...

Страница 119: ...ies Water Cooled Electronic Loads Operation Programming Manual 402828 Rev B1 Page 109 Appendix D WCS Outline Drawings Front View Rear View 40 2 82 8 0 2 20 C D R Top View Side View W e igh t 64 pou nds w ithout externa l acce ssorie s ...

Страница 120: ...v B1 Appendix E Flow Control Servo Installation 402828 02 21 CDR 1 2 inch dia x 2 inch long brass nipple Use pipe sealant both ends Water servo NOTE The recommended location for the water servo is on the outlet side Relay connector RELAY Water servo cable to relay connector RED BLACK FL W HITE RED BLACK FL W HITE ...

Страница 121: ...ads Operation Programming Manual 402828 Rev B1 Page 111 Appendix F DC Power Contactor Recommended Installation NOTES Red wires to relay connector and no polarity Cable B401812 provided Contactor 3 8 16 x 1 1 2 2 places 402828 02 22 CDR Relay connector RELAY RELAY ...

Страница 122: ...ose until the input voltage is less than the setpoint UV Undervoltage Fault LED Lights red when the input voltage is between zero and 0 6 volts and the UV switch on the rear panel is on The DC load relay will not close in a UV condition TEMP Temperature Fault LED Lights red when one or more internal power modules overheat This will disconnect the load and reset once allowed to cool I LIM Current L...

Страница 123: ... switch position 100 volts AC Next switch position 120 volts AC Next switch position 200 volts AC Highest switch position 240 volts AC Select the AC voltage you are using Load powers up but the red SYS fault LED lights and the DC LOAD LED will not come on AC line voltage may be too low The load detects low incoming AC voltage 88 or less and turns the load off for self protection Measure the AC inp...

Страница 124: ...oads input has exceeded the voltage limit setpoint menu item number 2 The load detects DC input voltage above its over voltage setpoint and Loads Off for self protection Measure the DC input voltage and reduce as necessary Check the loads voltage limit setpoint by pressing the menu button until item 2 Voltage Limit appears This voltage limit can set for zero to 105 of the voltage range selected Un...

Страница 125: ...ds can be installed Refer to the voltage sense related sections of Chapter 1 Unit powers up Loads On SYS and SAT LEDs are yellow and will not draw current There is little or no DC voltage applied to the loads input The SAT LED indicates the loads inability to draw the proper set point current due to lack of input voltage Measure the input voltage it must exceed the compliance voltage specification...

Страница 126: ... pushed The load is in the pulse mode Press the RUN button to clear the unit to the constant current mode In the constant power mode the voltage sense leads may be improperly wired If the voltage sense leads read zero applied voltage the load will try to draw infinite current to achieve the proper power Units are shipped with internal voltage sense lead jumpers installed on the rear terminal strip...

Страница 127: ... strip Oscillation is usually caused by the inductance of the cabling between the DC source and the load This cabling should be as short as possible and the positive and negative wires should be twisted to reduce the cable inductance Also connecting a capacitor across the loads inputs can squelch the oscillation IEEE address of the load is not matched with the computer program being used to commun...

Страница 128: ...k all switch positions watch for more than one unit set at the same number System does not recognize total number of slave units in system Bad master slave cable Inspect cable for cuts and shorts Replace if necessary Slave bit identifier switch not properly set Check all switch positions watch for more than one unit set at the same number Bad master slave cable Inspect cable for cuts and shorts Re...

Страница 129: ...TDI Dynaload Division WCL488 Series Water Cooled Electronic Loads Operation Programming Manual 402828 Rev B1 Page 119 Appendix H Specifications by Model ...

Страница 130: ...WCL488 Series Water Cooled Electronic Loads Operation Programming Manual TDI Dynaload Division Page 120 402828 Rev B1 ...

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