MANUAL PULSCALC PROGRAM
Contents
1. fits will be found see below 4 Fuse criteria as determined by the application Which model SMF 5 20mm etc Which voltage 250V 125V etc voltage set minimum voltage rating What type F T 5 All fuse criteria are set depending on the fuse series As soon as the series box is clicked all other criterion boxes set or not are removed because these are not relevant anymore 6 To change the temperature units press the F ahrenheit C elcius button 4 2 Data filing logs A single fit see previous chapter was found and the user is now requested into this screen to enter some logs description of selection for filing purposes data logs Fig 6 Data logs B USER MANUAL PULSCALC 16 BY M Hummel LFBV When the Data logs screen is filled in remark note not required and continue is clicked the final output is displayed In case in the Data logs screen the back button is clicked the user is taken back to the previous fuse selection screen 4 3 Output In case the final output see also example in chapter 1 5 is shown and the back button is clicked the user is taken back to the fuse selection screen see chapter 4 1 to change for example the fuse series amp rating selected ee ViewerForm Series Rating A 4 6 Model Type iF Standard IEC Approvals K S B V R C M Interr Cap HBC Voltage Vac 250 Appl I2t 1004 Oct 25 1999 tims 10 54 34 Object Description Program2. in as described below VI By the 4 sine wave approximation method no zero current level for a time period can be inputted example OA for 2mS Is such required it is advised to enter a fictive current of 1OmA 3 1 2 Data entering for an actual rush in current Find below the step by step procedure to enter a rush in current A Divide your rush in current as by current altering in parts up to maximal 15 positive current peaks B Repeat the following 3 steps for each part found 1 Determine the part end time 2 Enter the end time in the 2nd time column indicted t1 in the line corresponding to the part number USER MANUAL PULSCALC 11 BY M Hummel LFBV This entered value automatically will become the begin time indicated tO gray column for the next part line Note further that the last part time t0 tl automatically will be copied to all the following remaining fields and that a frequency is calculated and shown for indication 3 Enter in the 2nd current column indicted I A at t1 to the line corresponding current peak value As soon as a current value is entered this value will be in reverse order with the current indicated in the I A at t0 field gray automatically copied into the current fields for the next line part In case lines of current fields are skipped or forgotten these can be filled in automatically For the 1 4 sine wave approximation the skipped fields will be filled in reverse order with the val
3. test Requested by MH rush in current f t Name tested by MH Location Utrecht Remark Application nominal current A 0 960 I2t A2s at t 10mS 0 342 No of pulses 100000 F 20 0 0 0 55 11 1 16 4 22 0 27 5 33 0 38 6 43 9 49 5 55 0 tims Amb temperature C Circuit freg Hz 50 Stop all e i e Fig 7 Output The output can be hard copied by pressing the printer symbol similar to button When the printer symbol is pressed the user is requested via a standard Windows dialog box to enable the printer installed and to select a paper size In cases only of a new measurement or a new fuse selection a save symbol similar to button is shown By pressing this save symbol all relevant information can be stored in preferably a customer related sub folder see chapter 1 4 1 For completion also shown are the date amp time as well as the logs entered previously Note that further for indication purposes only the I2t value is shown for the application after 10mSec If the stop button is pressed before saving the results these are lost because a full program stop is performed As for all Windows dialog boxes pressing cancel results in that the active program form is re displayed This is helpful when for example the screen is destroyed partly by running an other Windows application END USER MANUAL PULSCALC 17 BY M Hummel LFBV
4. 250 7 fr we IEC HBC hd 20 0 FIC 100000 7 0 960 lt back continue Fig 10 Fuse criteria To perform a fuse selection specific fuse criteria need to be set The following 2 procedures for this are available A The user you needs minimal to set the model voltage and type fuse criteria The criteria standards amp breaking capacity are optional and need not strictly to be set B Set the preferred series only Other criteria such as pulse withstand amp ambient temperature are pre filled and can be altered here when preferred default settings 100k pulses amp 20 C The down below box on the screen shows pre filled the nominal current true RMS in Amps as derived from the data input last rows nominal current chapter 3 1 3 Sometimes the actual nominal current for an application takes time to settle several seconds In such a situation it might be preferred to use for the fuse selection a current value taken from a multi meter reading For this the pre filled value can be altered manually by clicking the box and entering a new value Note that a minimum nominal current RMS value of 0 5mA is required As soon as continue is pressed the criteria are used to fit fuse series amp rating In case no fit is found a message like no series available is displayed The cause often is to be looked for in the criteria For example model SMF amp breaking cap HBC are criteria which do not match Further note that th
5. MANUAL PULSCALC PROGRAM PULSCALC PROGRAM USER MANUAL TABLE OF CONTENTS 1 Pulscalc program 1 1 Foreword 1 2 Pulscalc program basic functions 1 2 1 Rush in current approximation methods 1 3 Approximation method limits 1 4 Requirements to run the pulscalc program 1 4 1 Software files 1 4 1 1 Obtaining a new period of 60 days 1 4 2 Hardware 1 5 Pulscalc programs output 1 5 1 Approvals 1 6 Pulscalc exe program 2 Running the pulscalc program 2 1 Starting up 2 2 Frequency 50Hz 60Hz 3 Approximation methods 3 1 Data entering 3 1 1 General guidelines in data entering 3 1 2 Data entering for an actual rush in current 3 1 3 Last rows nominal current 3 1 4 Example 3 2 Data Graphically 4 Fuse selection 4 1 Fuse criteria 4 2 Data filing logs 4 3 Output Appendix A Example of approximation page 1 page 2 page 3 page 4 page 5 page 6 page 8 page 9 page 10 page 11 page 12 page 15 page 16 page 17 page 14 USER MANUAL PULSCALC BY M Hummel LFBV 1 Pulscalc program 1 1 Foreword This manual gives a functional description of the PULSCALC program pulscalc abbreviation of Pulse Calculation With this program Littelfuse presents a way to help you select fuse links from our wide product range for your customers application Using this program might help save extensive time that is normally required for testing For using and therefore to fully benefit of this program and its
6. capabilities the following is required a Hard copy of the applications rush in up to maximal 1Sec I f t hard copy oscilloscope excel graphic representative sketch b Indication of the applications nominal current I at t gt gt gt t push in hard copy oscilloscope excel graphic multi meter reading 1 Note that in case data can be red see below from an oscilloscope this very well might be helpful to establish a hard copy by using this data in for example Windows Excel The application tester is a help tool for indication purposes only and Littelfuse therefore keeps all rights reserved 1 2 Pulscalc program basic functions The basic function of the pulscalc program is providing a way to enter manually the basis current criteria rush in amp nominal and to use this data among others see chapter 4 to perform a proper fuse selection Data sometimes can be provided red by oscilloscopes via for example a RS232 communication port The problem is that this oscilloscope data often per brand differ in format and contents and therefore is not suitable for development of a standard program For this reason and the added reason that as indicated also no data read out possibility might be available at all this manual method is to be used To enter the rush in current an approximation method referring to a method of calculation and representation is to be selected as from the options listed below The nomi
7. d structure looks like shown below C E PulsCalc pulscalc exe FuseData txt PulsCalcHelp pdf Data Customer A Exp1 txt Exp2 txt Customer B Linl txt _ Customer C Lin1 txt Sin1 txt Sin2 txt 1 4 1 1 Obtaining a new period of 90 day The data file FuseData txt contains the actual control code over the expiring period of 90 days By using the following E mail procedure an updated data file is obtained enabling a new 90 days period of use a Enter the e mail address mailrobot littelfuse nl b Enter in the subject line database c Send this e mail No e mail contents is required d The updated FuseData txt file will be replied automatically e Put this FuseData txt file into your local PC folder or replace the existing one 4 5 Note that it is not required to wait with the renewal until the 90 days have expired To prevent surprises for example at your customers location it might be for the best to keep a 10 days safety margin USER MANUAL PULSCALC 4 BY M Hummel LFBV 1 4 2 Hardware The following hardware components are required a Minimal PC486 16MB memory b A printer in order to enable hard copies of the results should be installed c Monitor resolution at least 800 640 6 Monitors of different resolutions might result in what looks like scrolled pages Especially in cases of higher resolutions the easiest way is probably to reduce the resolution to 800 640 via the Windows monitor
8. e breaking capacity options LBC EBC amp HBC are strictly related to IEC standards and cannot therefore be used for UL USER MANUAL PULSCALC 15 BY M Hummel LFBV fuses Also note that as soon as a criterion box is clicked even without setting one specific an option is assumed chosen and therefore might cause no fit to be found So to disregard a certain criterion the box may not be clicked In case of such a failure it is suggested to re start this screen via the previously shown approximation curve screen via the back button or clicking in case present the option In case on pressing continue more than one fit is found the series options to select from are displayed at the bottom of the screen The one preferred is to be chosen first So with this program only one in the time fuse series amp rating can be selected In case one fit is found on clicking continue the following screen Data logs is opened On clicking the back button the tester is taken back to the approximation data enter input form see chapter 3 to re start the enter input process for example for checking other pulses Note that the present results will be lost in case not saved see chapter 4 3 1 In general to come to a fuse selection technical back ground info and knowledge is required on the application such as primary or secondary circuitry 2 set select by single click from pull down menu options criterion box 3 The less criteria the less chance of no
9. e total simulation time is less then 20mS the current value entered as in line 15 is assumed the DC value For the 4 sine wave approximation method the last entered time frame of 1 Hz sec is assumed to describe the AC value As mentioned before no total simulation time of less then 1 Hz can be entered The RMS value is calculated by the program and then extrapolated to 1s 1004ms Later on this value can be altered manually via the fuse criteria screen see chapter 4 for example when the actual value was measured before by using a multimeter Note that a minimum RMS of mA is assumed automatically this is not visible in data enter input form 3 1 4 Example In the appendix A an example for the 1 4 sine wave approximation is shown In figure A is found the rush in curve divided in parts as well as the current peak values for that specific part and in figure B the corresponding filled out approximation data enter form 3 2 Data graphically Assuming all the 15 lines as on approximation data enter input form have been filled in correctly and continue was pressed the curve as entered is graphically displayed as shown below USER MANUAL PULSCALC 12 BY M Hummel LFBV em current rush in current f t 8 6 2 9 2 9 14 4 0 5 5 11 0 16 5 22 0 27 5 33 0 38 5 44 0 49 0 5 fig 5 Approximation data graphically In case the graphic shows faulty non preferred inputs these can be corrected via the data ente
10. ements to run the pulscalc program Below the requirements are listed to be able to run the pulscalc program Also described is the system by which the user is provided a 90 days period of usage and the way to renew enable such a following period Without renewal after at the latest 90 days the PulsCalc program will not run This period is chosen to keep control over the fuse data in use The days remaining are displayed as soon as the program is started 1 4 1 Software files The program only will run when Windows95 98 is installed The 2 below indicated files need to be installed copied for actually running of the pulscalc program a pulscalc exe b fusedata txt It is advised to create on your PC locally a main folder PulsCalc and to copy pulscalc exe amp fusedata txt into this As soon as the pulscalc exe stand alone program is run by double clicking it a sub folder directory data in case not present is created here USER MANUAL PULSCALC 3 BY M Hummel LFBV It is also further advised to create via the Windows Explorer in this sub folder data manually customer related e g by name sub folders for saving the test results with fuse selections relevant data amp information See for further info on this chapter 1 5 Note For completion it is suggested also to copy this manual PulsCalcHelp pdf into your main folder As described it is advised only to use the mentioned file structure Graphically explored the advise
11. files can be loaded see load file button in chapter 3 1 for the mentioned purposes ONLY when the file name starts with the starting word related to the approximation method chosen as shown below If not properly used the program will crash Sin gt 1 4 sine wave approx method Exp gt exponential approx method Lin gt linear approx method 1 5 1 Approvals Also listed in the output are the approvals valid for the fuse selected by using abbreviations Listed below you will find the description of the abbreviations B B S I Kitemark C CSA Accepted CSA CSA Certified K Kema Keur M MITI R UL Recognized S SEMKO V VDE UL UL Listed 1 6 Pulscalc exe program The testers program Pulscalc exe consists in principle out of 2 segments After choosing the preferred method by the first segment the actual approximation is to be performed by entering the data manually see chapter 3 This is than immediately followed by the second segment where the actual fuse selection is done by using the data entered and corresponding user defined criteria see chapter 4 All the above is initiated as soon as the program is run Important Sometimes a failure message is displayed when a new screen is built In many of these cases the originating failure is to be considered fatal and the pulscalc program must be re started To prevent loss it is therefore suggested to save via the programs button the data as soon as poss
12. ible This way the data can be recalled via the load button USER MANUAL PULSCALC 6 BY M Hummel LFBV In case of questions please feel free to contact someone at our Littelfuse sales office Further we would like your help on improving the program and its functions Therefore your suggestions and remarks are highly appreciated We thank you in advance Littelfuse B V Utrecht tel 31 30 2999900 fax 31 30 2999800 e mail littelfuse littelfuse nl USER MANUAL PULSCALC 7 BY M Hummel LFBV 2 Running the pulscalc program 2 1 Starting up Once installed files copied the program is started by double clicking the pulscalc exe file A screen will appear with a start amp stop button as well as further the time in days when the program will expire or StartUp x 7 4 Littelfuse This program will expire in 59 Fig 2 After start up Please press start to begin The screen shown below appears with the approximation methods to select from as mentioned in the chapter 1 2 1 ee ApprxchForm select method of approximation exponential approximation orason om Fig 3 Approximation method choice USER MANUAL PULSCALC 8 BY M Hummel LFBV 2 2 Frequency 50Hz 60Hz USA applicants In case this program is used in e g the USA the frequency is to be altered to 60Hz via the switch button Default is set at 50Hz Since the frequency is used for calculation of the true RMS nominal curre
13. ines are assumed to describe the nominal current and should therefore be considered special See for details the chapter 3 1 3 Pressing the load file button opens the Windows open dialog box by which the directory structure is shown see chapter 1 4 1 Via selecting the preferred customer data directory at first all previously saved files corresponding to the selected approximation method are shown see chapter 1 5 Once a file is chosen the data is copied into the approximation data enter input form and is the selected file number is displayed Note that now the load file button is changed to reset button which once pressed removes the data again and restores the load file button USER MANUAL PULSCALC 10 BY M Hummel LFBV Once data is loaded clicking a random chosen data enter input field resets the file number and is the data now considered new data In this way previously entered data can be altered and a new fuse selection be performed as described further on in this manual After inputting data correctly taking into account all the limits and guidelines pressing the continue button results in displaying this data graphically for visual check see further on In case a file was loaded before clicking moving the cursor onto the continue button results in that the output is displayed immediately By this way previous results can be reviewed re printed or even changed Is the back button pressed the user is taken back to the ap
14. nal current can be entered either via the rush in current or directly see further on for details 1 2 1 Rush in current approximation methods Since each rush in is different from shape this program offers 3 methods you can select from to approximate see chapters 2 4 amp 3 the rush in current as closely as possible I 1 4 sine waves approximation by using period sine waves II exponential approximation by using exponential curves Il linear approximation by using straight lines USER MANUAL PULSCALC 2 BY M Hummel LFBV 12 For an easy approximation and accordingly easy manual processing it is HIGHLY recommended to simplify the rush in amp nominal current graphics first and then to select the appropriate method Simplification means that the curves should be removed from raw edges and so become polished 3 Methods cannot be mixed 1 3 Approximation method limits In using the approximation methods the following limits should be taken into account 1 minimum time resolution 10uS 2 maximum time resolution 14 sine wave approx 20mS exponential amp linear approx 200mS 3 minimum rush in current total simulation time 14 sine wave approx 1 Hz gt 1 50 20mS or 1 60 16 66mS exponential amp linear approx 10mS 4 maximum rush in current total simulation time up to 1Sec 5 minimum current value resolution 10mA in case lt gt 0 6 maximum current peak value up to 1000A 1 4 Requir
15. nt value see last rows nominal current chapter this should not be forgotten In case of a DC rush in the frequency is not relevant and the setting has no influence In the following the 14 SINE WAVES APPROXIMATION method is used as example to explain step by step the process to come to a fuse selection The other two methods are similar The only significant difference is that the other methods allow DC currents to be entered as well as that some limits are different USER MANUAL PULSCALC 9 BY M Hummel LFBV 3 Approximation methods 3 1 Data entering The 14 sine wave approximation method was chosen as for example Now the screen as in figure 4 is displayed The step by step process starts by filling this data enter input form see chapters 3 1 1 3 1 2 assuming no file was loaded see down below ei 174 sine waves approximation 1 4 SINE WAVES APPROXIMATION il E E E E G E E E 5 E E 5 5 Fig 4 Approximation data enter input form The rush in current is to be divided in parts Each part is described by 1 line as on the input screen So by this program it is possible to describe a rush in current by maximal 15 lines Each part starts where the current is altering its direction and ends at the first next point the current direction alters Note that the end of a part therefore is the start of the next part and a zero cross is considered a direction alteration see appendix A The values as in the last l
16. proximation method choice form in order to select another preferred method Was data already entered or loaded see below this is removed 1 See note 2 as in chapter 1 2 3 Both methods enable the user to change existing data and or selected fuse series amp ratings 4 Note that the negative sign fields remain as they were set by the file loaded and that these need to be changed manually as described below 3 1 1 General guidelines in data entering Besides the method limits as described in chapter 1 3 find the below Note that in the program some entering input supports have been built in such as that timing and current inputs are copied to the next rows when skipped etc I Consider each peak as a positive current peak 0 180 Negative peaks as from your rush in current need to be interpreted positive to divide your current in parts correctly Note that for input negative peaks may be entered chapter 3 1 3 B 3 II Fields can be entered in random order columns rows However it is better and quicker to enter them from top to bottom per row This way you can benefit from most of the programs built in input enter support Ill Values are entered by double clicking or clicking another field IV Columns shown gray cannot be manually entered and will be filled and updated automatically V All 15 lines must be filled in It is advised to fill in the relevant lines first and then to enter line 15 Lines skipped this way will be filled
17. r input form which re appears when the back button is pressed Further shown on this screen is a printer symbol button that in case pressed creates a hard copy of the graphic for documentation purposes of your application Pressing the continue button the current as function of time result is accepted and will take the user to the fuse selection part of the program 5 For plotting this curve a polynom line type method is used which in some cases might introduce some slight swinging waves 6 Note that in case new data is entered the data in the line 15 needs to be re confirmed by double clicking to ensure all the results as for example all the I2t values to become re calculated USER MANUAL PULSCALC 13 BY M Hummel LFBV Appendix A Example of approximation rush in current f t Fig A Dividing rush in current into parts i 1 4 sine waves approximation BEE t1 mS freq hz fA attO IAjatti l2t A2s neg lt i lt li lt i lt i lt i lt i lt lt CAPULSECHT DATA EXAMPLE S SINEXAM TXT Fig B Approximation data enter input form For details see chapter 3 USER MANUAL PULSCALC 14 BY M Hummel LFBV 4 Fuse selection 4 1 Fuse criteria After finishing the previous part in which the actual approximation has been performed and accepted the actual fuse selection is to be done X 5x20 x
18. setup The result then is that the program is running in an undersized box 1 5 Pulscalc programs output After following the step by step guidance in this manual an output is calculated Below an example of such an output is shown This output can be copied pasted to for example a project documentation paper by using the Windows clipboard option alt print scrn e ViewerForm Series Rating A Model Type E Standard IEC Approvals K S B V R C M Interr Cap HBC Voltage Vac 250 Oct 25 1999 10 54 34 Object Description Program test Requested by MH rush in current f t Hame tested by MH ET TT TTT TTT Location Utrecht A a Remark a Application nominal current A 0 960 I2t A2s at t 10mS 0 342 wee e e e E T E E Ho of pulses 100000 a A E T E E a E E E Amb temperature C 20 0 0 0 55 11 14 16 4 22 0 27 5 33 0 38 6 43 9 49 5 ati Circuit freq Hz 50 LITTELFUSE all rights reserved Fig 1 output Besides the cut paste option the output can be hard copied directly Note that only previously via Windows installed printers can be used The paper size used for the output can be set later during the printing acting Further there is a possibility to save all relevant data amp information for later re work re viewing re printing of this output USER MANUAL PULSCALC 5 BY M Hummel LFBV Please refer to chapter 4 3 for more details 1 7 Previously saved
19. ues as inputted in the last previous line For the linear and exponential approximation methods only skipped current value fields will be filled in if the last value zero allowed is equal to the current value of the line skipped to All in between fields will be set at the same current value assuming DC Only for the best looking rush in current hard copy it is advised to enter negative values in case of a negative current peak In case a negative current value is entered the corresponding field in the neg column is marked indicating a negative sign while the current is shown absolute Note that it is easier to add negative signs later by activating the neg sign marks by moving the cursor over the relevant mark fields Was a mark already set it is then removed Notice that the mark field is extremely sensitive for the cursor movements and that so mistakes are made easily Also calculated and shown for indication is the I2t value of the parts Further as mentioned earlier note that the inputs of the last lines are special For more details see the below chapter 3 1 3 Last rows nominal current The last set of input lines should be taken care of in a special way because these are assumed to describe the true RMS nominal current In case of the linear as well as the exponential approximation methods in the last input rows 15 and before for a time period of at least 20mS an equal current is entered this is assumed the DC value If th
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