Model 4615B User`s Manual
Contents
1. of a discontinued Magtrol product Magtrol Inc assumes no responsibility for errors or omissions Additionally no liability is assumed for any damages that may result from the use of the information contained within this publication LAST PRINTING F4 November 1990 J MAGT ROL 1 Introduction Your Model 4615B is adequately packaged for shipping We recommend that you save all cartons and packing material until the unit has been operationally checked If there is any evidence of shipping damage notify the carrier and Magtrol Customer Service as soon as possible Please be sure to check the carton and packing material carefully for cord sets or other loose items LINE VOLTAGE Warning Please check the line voltage setting The Model 4615B operates from either a 120V 60Hz or 240V 50Hz power source If the point of destination line power is 240 50Hz please check that the voltage is set properly Adjustment is made from a switch contained within the line cord receptacle on the rear panel The line cord is a detachable NEMA Standard 3 wire All Magtrol Dynamometer and Electronic Products require that the cabinets and hardware be earth grounded for proper equipment operation and personnel safety INITIAL CHECKOUTS In order to check out the 4615B it will be necessary to have a Magtrol Dynamometer A 14 pin 14 pin Instrumentation Ribbon Connector Cable supplied with the unit will interconnect the two Please install this cable before turn2. both torque and speed for dynamic tracking accuracy U13 and U14 are the counting elements their outputs buffered by U15 and U16 SIGNAL PROCESSING The primary MPU and GPIB controlling electronic functions are contained on the PC Bd MCI 2 On this assembly US is the Microprocessor U9 is the Programmable Read Only Memory containing the 4615B operating system There is a 2K disc emulation RAM device identified as U10 U11 and U12 are Peripheral Interface Adapters U1 U2 and U3 are the GPIB interface control elements U6 and U7 are the LED segmented digital readout drivers The balance of the components are buffer and timing control devices There is a power supply PC Bd PSB 5 providing 5 logic power 15 Volts for the analog elements If you have questions or require more detailed information please contact Magtrol Customer Service Technical Information 6 Calibration and Balancing There are calibration and offset adjustment controls for most of the analog elements Normally no adjustment is anticipated for the life of the instrument However all or part of the calibration and balancing procedures may be indicated if any of the following conditions exist e Atorque difference between CW and CCW full scale readings of greater than 2 least significant digits in standard resolution e Inability to zero the torque reading with the ZERO control located on the back panel of the dynamometer If the dynamometer is new be sure the
3. the and Q Bal trimpots until you know that each is adjusted such that your output torque reading is just at zero on both trimpots While observing the 4615B Torque Reading 1 Adjust the Q Bal trimpot slowly try both CW and CCW rotation until the indicated torque value reads higher then back off very slowly to obtain a minimum or zero value Repeat this procedure on the Q Bal trimpot Work back and forth between both trimpots until you alternately obtain 0000 with 0001 flashing FULL SCALE TORQUE CALIBRATION 1 Complete the zero adjustment procedure outlined in the preceding paragraph Install the Dynamometer Torque Calibration beam as shown in the sketch 2 Rotate the TORQUE control on your power supply full CW for maximum applied torque With a precision weight apply a known torque at or close to full scale in the CCW direction Maintain the beam exactly horizontal and perfectly still 3 Observe the voltage reading on the voltmeter across pins 13 and 14 Adjust the TORQUE CALIB on the rear panel of the dynamometer for a voltmeter millivolt reading exactly equal to the true torque applied 4 Adjust the Q Cal trimpot until the 4615B torque reading is equal to the voltmeter reading and the true torque applied 5 Place the weight on the opposite side of the beam adjust the Q Cal trimpot to match the 4615B Torque reading to the true torque applied ACCESSORY TORQUE OUTPUT With zero torque on the dynamometer ope
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5. Magtrol 4615B User s Manual Contents 1 Introduction ccccccccsssssssssssssccceeeceseeees 2 4 T O Connectors sssssssssssssssssssssssseossoossesoo 9 LINE VOLTAGE oaeee 2 TEEE 488 INTERFACE oiii 9 INITIAL CHECKOUTS 000 2 ACCESSORY TORQUE SPEED OUTPUT 9 OPERATIONAL CHECK 2 DYNAMOMETER CONNECTOR 10 2 Op rati n sasscstienssssccsvssscnsiensareeteveseesstenpescanes 3 5 Circuit Description ssesssosesoessoessoesssose 11 SPEED DISPLAY 0000an 3 TACHOMETER on ll TORQUE DISPLAY o a 3 TORQUE TRANSDUCING iii 11 SETTING THE TORQUE RESOLUTION 3 SIGNAL PROCESSING aaiae 11 PUSHBUTTON FUNCTIONS ee 3 6 Calibration and Balancing 006 12 SAVO sate toes Gi A E soietcuarnesey nuns 3 Warning O 2 air A E N E EE I L A AAEE TT i PROCEDURE 12 RS A teeta TORQUE AERO ARTUS TAMENT oiri 2 PROGRAM PUSHBUTTON csccssscssssseeee 4 FULL SCALE TORQUE CALIBRATION 13 POWER CALIBRATION ooc cccccccsssssssssesseeeeee 4 ACCESSORY TORQUE OUTPUT 13 MODEL 4615B SPECIFICATIONS 13 3 Computer Interfacing eessesssosssosssosesoese 6 GPIB IEEE 488 acneei 6 GPIB COMPUTER INSTALLATION 6 SOFTWARE INSTALLATION 000 6 PRIMARY ADDRESS oaair 6 4615B INSTRUCTIONS e 7 DATA ACQUISITION oiii 7 DATA ACQUISITION PROBLEMS 8 PLEASE READ This document includes text recovered from the final edition of a now obsolete manual
6. e greater than 15 check with your particular interface s primary address code range capability 4615B INSTRUCTIONS Three instructions are accepted by the 4615B H CR LF will set Hi Resolution operation S CR LF will set Standard Resolution 1 through 18 CR LF will set the divisor constant value Memory control of the 4615B is not GPIB addressable since the same data is available to the computers more extensive resources via the BUS Example A program to output an instruction to fix the Torque resolution exactly equal to that shown on the dynamometer front panel The language is Microsoft Quick Basic using a National Instruments Corp GPIB PCHA P N 320043 01 IEEE 488 Interface FESS GCI GICICCI GIGS IG ICI II III IK CLS N DEV5 Assign the primary address wrt S CHR 13 CHR 10 CALL IBFIND N BD Subrtn Call Init Pri Addr CALL IBWRT BD wrt Subrtn Call output data END FK K K K K K K K K K K K K K 3K K K 2K K K K 3K K K 2K K K K 3K K K K K K K K K K 2K K K K K K K 2K K K K K K DATA ACQUISITION If your primary address is set and addressed correctly the 4615B will respond It probably will be necessary to dimension your input variable to 22 20 data characters plus CR LF Speed Torque data from the 4615B is in ASCII format and structured with leading zeros as follows Pddddd SdddddTdddd L Where d Decimal digit 0 thru 9 P indicating that the following 5 digits D P is the Power di
7. e rear panel There is additional information on the 14 Pin Dynamometer ribbon connector in your Dynamometer User s Manual IEEE 488 INTERFACE Computer to Instrument interconnection uses the standard IEEE 488 Instrument Cable available from instrumentation cable manufacturers computer hardware outlets Magtrol Inc or Hewlett Packard dealers It is normally supplied with the IEEE 488 computer interface hardware Following is a brief description of the interface lines For more thorough information there are various publications on the IEEE 488 from Intel Motorola IEEE National Semiconductor and Hewlett Packard just to name a few Two bytes form the composition of the GPIB 8 bits for data transfer and 8 bits for interface control D1 D8 are the data signal lines The data format is 8 bit ASCII DAC RFD DAV are byte transfer lines RFD Ready For Data goes passively high DAV Data Valid an instrument may signal that its data is valid by pulling this line low DAC will go passively high signaling that the data has been accepted ATN IFC SRQ EOI REN are the bus management lines that control the orderly movement of information across the interface lines ATN attetion monitored continually and a change results in activation of the transmit receive control signals IFC interface clear used by the system controller to place the GPIA General Purpose Interface Adapter chip into a known quiescent state SRQ service requ
8. est signals a need for service by requesting the controller to interrupt the current sequence of events REN Remote Enable selects an alternate source for device programming data This converts the GPIA into another state of operation EOI End or Identify has a dual purpose It may signal the end of a multibyte transfer or when used in conjunction with ATN places the contents of the parallel poll register on the bus ACCESSORY TORQUE SPEED OUTPUT This is an output only connector for input signal provision to Magtrol Model 4617 and 4619 Dynamometer Controllers The connector is a standard 5 Pin DIN type The cord set required for interconnecting is Magtrol PN 88CS08 normally supplied with the controllers The TACHOMETER SIGNAL is a TTL compatible frequency output of 60 pulses per shaft revolution The tachometer common is at chassis ground TORQUE OUTPUT is a bipolar analog signal with the common at chassis ground The signal level is described in the next paragraph DYNAMOMETER CONNECTOR This is a 14 Pin ribbon connector interconnecting the 4615B and any Magtrol Dynamometer Pin 11 Tach supply 9VDC is a filtered bias voltage for the Tachometer Photo Cell The actual voltage on this pin is not critical and may be anywhere from 9 to 12V referenced to pin 8 Pin 10 is the tachometer frequency signal producing 60 pulses per shaft revolution The signal level has a low voltage of 2 1 and a signal high of 1 0 2 VDC The com
9. ination with the disc produces a pulse train signal of 60 Bits revolution for RPM indication This frequency proportional to speed is applied to a counter under control of an MPU The elements comprising the counter shown in the following block diagram are contained on PC Bd TSC 1 Q1 is the input detector Ula b and c are buffers The basic counter is comprised of elements U8 and U9 With the time base composed of elements U5 U6 and U7 The time base input frequency is 1 0MHz reduced to a precise 5 second period Additionally there are buffers and interface elements U10 and U11 TORQUE TRANSDUCING All Magtrol load cell equipped dynamometers produce an analog torque signal where the signal level is exactly equal to the torque value in millivolts For example an HD 400 6 with 43 42 Oz In of torque applied will output a voltage of 0 4342 volts Connector J2 on PC Bd No TSC 1 receives this signal and applies it to operational amplifiers U2a and U2b The output of U2b is used by the MPU to establish the CW and CCW shaft direction indication on the digital readout U2a output is applied to U2c a buffer for the torque signal output applied to the ACCESSORY TORQUE SPEED OUTPUT connector on the rear panel of the 4615B This same signal is also applied to two V F converters U3 and U4 The frequency output is converted to digital using an integration period identical to the speed conversion time This results in concurrent integration of
10. ing on any equipment OPERATIONAL CHECK Please note For the balance of this reference manual the term LED refers to the Light Emitting Diode indicators on the push button switches of the 4615B 1 Turn on the Power Switch left side 2 Spin the dynamometer shaft by hand You should see both the Torque and Speed displays respond Caution If you are installing a new dynamometer and if the torque reading is frozen at a high value have you removed the load cell restraining shipping bolt Ref Dynanamometer User s manual 3 Depress the PROGRAM Push Button The LED on the PROGRAM button should go on and the POWER display show one or two digits only any number from 1 though 18 4 Press the PROGRAM button again and the POWER display will revert to the original reading the PROGRAM LED should go out If the above checks out satisfactorily it may be assumed that the 4615B has survived shipping If you have any questions or should there appear to be a problem please contact Magtrol Customer Service 2 Operation If the 4615B is used in conjunction with a Magtrol Model 4629B controller please refer to your Dynamometer User s Manual interconnection diagrams The Dynamometer should connect directly to the Model 4629B with the 4615B serviced from the ACCESSORY TORQUE SPEED OUTPUT of the 4629B Controller You must have a 7 Pin Din to 14 Pin Ribbon Cable Magtrol P N 88CS09 SPEED DISPLAY Shaft RPM is indicated on 5 digits wi
11. load cell restraining bolt for shipping has been removed There is no calibration for the digital speed reading accuracy Please refer to MODEL 4615B SPECIFICATIONS in this chapter Warning The following requires removal of the 4615B top cover All connections and trimpot adjustments must be made only as specified herein and with caution There is an electrical shock hazard inside the 4615B PROCEDURE Routine torque calibration and zero offset adjustments should always be done with the dynamometer back panel controls The torque signal offset and calibration controls within the 4615B are there to permit standardization to known and precise value inputs All calibration and balancing potentiometers are contained on the circuit board identified TSC 1 located in the upper right corner of the 4615B chassis facing from the front The sketch shows that portion of the board where the trimpots are located and their identification TORQUE ZERO ADJUSTMENT Caution Be sure to remove the coupling from the dynamometer shaft 1 Place a precision voltmeter resolving at least 1 millivolt D C between pins 13 and 14 on the DYNAMOMETER ribbon connector pin 13 negative You may have to remove the connector cap on the cable or obtain access from inside the dynamometer rear panel 2 Adjust the dynamometer zero control for best zero dynamometer torque signal output on your voltmeter The object in the following steps is to alternate between
12. mon to this signal is Pin 8 Pin 14 is the torque signal referenced to Pin 13 This is a bipolar analog voltage Pin 13 common is chassis ground The torque signal amplitude varies with the individual dynamometer It is equal to the whole number of the torque value identified on the dynamometer front panel in millivolts Positive polarity occurs with torque applied in CW direction of rotation For example an HD 106 6 with torque applied in a CCW direction Torque 2 53 Oz In 253 Volts between pins 14 and common pin 13 Pin 9 Pin 12 are decimal point locator lines Each individual dynamometer will have the appropriate line connected to ground that codes the D P location for the 4615B and other Magtrol products The D P locator code is l dddd Pin9N C Pin 12 N C dd dd Pin9 LO Pin 12 N C d ddd Pin 9 N C Pin 12 LO Where N C no connection LO Common to Pin 8 Pin 7 is 5 0 VDC for the Photo Cell Lamp It references common to pin 8 as shown Pins 3 4 and 5 6 are 20 VDC isolated instrumentation voltages for the torque signal amplifiers and the torque load cell power supply Within the dynamometer inclosure these unregulated voltages are converted to regulated 15 VDC and adjustable 7 9 VDC for the dynamometer torque transducer load cell 5 Circuit Description TACHOMETER Mounted on the end of the Dynamometer shaft is an encoding disc divided into 60 opaque and clear segments A Lamp Photocell in comb
13. n shaft 1 While reading the torque value adjust the Dynamometer ZERO Control for best zero reading 2 With a voltmeter resolving at least 1 millivolt D C connected to the TORQUE output on the ACCESSORY TORQUE SPEED OUTPUT connector adjust trimpot Qo Bal for best zero reading Attach the Calibration beam energize the brake to hold the beam attach a weight to apply an amount of torque close to the dynamometer full scale rated value Adjust Qo Cal for a reading exactly equal to the actual torque applied Ww MODEL 4615B SPECIFICATIONS SPEED Accuracy 0 05 of the SPEED reading 1 0 RPM TORQUE Basic torque accuracy is controlled by the dynamometer ZERO and CALIBRATION controls The level of care and frequency of adjustment is important Please refer to your Dynamometer User s Manual The Torque conversion elements within the 4615B contribute no more than a temperature related drift of up to 005 C ambient change of reading POWER This value is digitally calculated from the torque and speed values and will contain the product of any errors within these parameters Testing Measurement and Control of Torque Speed Power Load Force Weight Tension Displacement MAGTROL INC 70 Gardenville Parkway Buffalo New York 14224 USA Phone 1 716 668 5555 Fax 1 716 668 8705 E mail magtrol magtrol com MAGTROL SA Route de Moncor 4B 1701 Fribourg Switzerland Phone 41 0 26 407 3000 Fax 41 0 26 40
14. n systems require the use of data termination characters The 4615B uses the Hewlett Packard HPIB standard termination characters Carriage Return CR Line Feed LF in that order The 4615B looks for these instructions in HEX format to terminate communication reset the interface and continue with normal program execution There may be another formatting question relating to a communication fault delay timeout This is done in order to alleviate a computer hang up Do not set this period under three seconds Ifthe computer resets the interface prematurely the host instrument can hang up waiting for the never to happen CR LF PRIMARY ADDRESS All instruments serviced on the GPIB have a separate primary address code On the rear panel next to the GPIB connector there is an opening providing access to the code selection switch The default setting from the factory on the 4615B is five 05 If you wish to change the code the chart will help in obtaining the setting you want Please note that the MSB is on the right Switch segment identification hardware resulted in the binary code notation reversed from the standard convention where the MSB is normally on the left Some PC interfaces National GPIB PC2A will access 0 to 15 4 Bit primary address numbers only Others may access up to 31 5 Bit codes even though the GPIB capability is limited to 16 instruments The 4615B Primary Address uses the 5 bit format Before selecting a valu
15. splay S indicating that the next 5 digits are RPM T indicating that the next 4 digits D P is Torque The last character shown L may be either L or R L CCW dynamometer torque application R CW The 4615B requires no specific input instruction in order to output immediate torque and speed data Simply follow your Computer GPIB interface instructions and issue a data input command The following is a simple single input instruction source program written in Microsoft Quick Basic using a National Instruments Corp GPIB PCIIA P N 320043 01 IEEE 488 Interface It will access the 4615B fetch immediate data and display it exactly as received FESS GISCIGIIGIICICI GI SGIGI ICIS ICI ICI IC I CK ak a CLS N DEV5 Assign the primary address rd SPACE3 22 Make room for the data CALL IBFIND N BD Subrtn Call Init Pri Addr CALL IBRD BD rd Subrtn Call Input data to rd PRINT rd Let s have a look END 3K K K K K K K 3K K 3K 2K K 2K K 3K K K 2K K K K 3K K 3K 2K K 2K K 2K K K 2K K K K K K 3K K 3K 2K K K K K 2K K K K K K DATA ACQUISITION PROBLEMS Usually a failure to communicate is a result of incorrect primary address improper computer input variable word size none or incorrect termination characters CR LF You may save time by contacting Magtrol Customer Service ask for GPIB software assistance 4 1 O Connectors Following is a description of the electrical connectors contained on th
16. th resolution of 1 0 RPM Data integration and update rates on both the speed and torque display is synchronized at 0 5 seconds Chapter 4 contains additional technical information TORQUE DISPLAY Dynamometer torque is displayed with 4 digits in floating point notation Left of the MSD isa sign indicating the shaft rotation direction of applied torque The sign indicates clockwise direction counter clockwise When you first connect the dynamometer and turn the equipment on the torque display may not indicate exactly zero If you have not coupled a motor to the dynamometer shaft then proceed with the dynamometer rear panel ZERO and CALIB procedure covered in your Dynamometer Manual Chapter 1 If you have coupled a motor it is normal for the torque display to indicate a residual value This is do to shaft bearing friction in both the motor and dynamometer SETTING THE TORQUE RESOLUTION Rated full scale torque value in standard resolution is shown on the dynamometer front panel However in normal operation if the most significant digit is zero the TORQUE DISPLAY shifts 1 2 digit to the left increasing the resolution by 5 times This means that the least significant digit displays in increments of 0 2 4 6 8 With certain torque units the increased resolution could cause the reading to exceed four digits In this event the display temporarily shifts one digit to the right returning to standard resolution Torque resolu
17. the POWER readout with a new DIVISOR CONSTANT value The operation is simple but if you forget to do it you may obtain a peculiar POWER reading usually fairly obvious Please proceed as follows POWER CALIBRATION 1 Pull out the card from the bottom plate A similar chart is shown on the next page 2 Depress and release the PROGRAM push button The LED will go ON and the POWER display will indicate the current two digit code number 3 From the Divisor Constant Table list select the Torque units that the Dynamometer in use is calibrated This is shown on the front plate of the Dynamometer 4 4 Press either the UP or DOWN push button until the correct CODE 1 thru 9 for HP 10 thru 18 for WATTS is displayed on the POWER readout 5 Press the PROGRAM push button again to exit the Mode the LED will go OFF saving the value and the power readout will be calibrated This calibration selection is non volatile ie it is retained after the unit line power is turned off The HP and WATTS C values are shown for your reference They represent the value that the 4615B MPU divides into the product of Torque x Speed from a specific CODE selection derived from the basic formulas HP LB FT x RPM 5250 Watts HP x 746 The 4615B is interchangeable with all Magtrol Dynamometers It has no information regarding the specific units of torque ie Oz In Kg cm N m etc Therefore the PROGRAM function is to inform the POWER display only as
18. the SAVE LED will go OFF the RECALL LED goes ON placing the unit in RECALL mode The Power Torque Speed display changes to memory data The first data point saved is now displayed As you repeatedly depress the RECALL button the display advances to the next data value and so on exactly in the order you originally saved them When you have advanced through all of the data contents of memory the last reading will remain unchanged but the RESET LED will flash ON OFF four times indicating out of data You may start over by depressing the RESET then RECALL button again If you press the SAVE LED while in RECALL mode the 4615B will flash the RESET LED four times It is not logical to save data already saved Reset RESET is functional in RECALL mode only Two things happen First the RECALL mode is exited restoring the display to immediate data Secondly the memory recall data pointer resets to the beginning of the data memory stack The SAVE LED will go back on PROGRAM PUSHBUTTON The purpose of the PROGRAM mode is to calibrate the POWER reading only If you purchased the 4615B with a Magtrol Dynamometer the unit will be factory set reading in HP as you receive it If there is more than one dynamometer the unit may be set up for either If you connect the 4615B to a dynamometer reading in different torque units from those previously calibrated or if you desire to change the POWER reading to WATTS then you must remember to program
19. tion may be fixed to the standard value shown on the dynamometer front panel by either of two methods First by outputting an instruction character via the GPIB as described in the next chapter or secondly with the unit turned OFF wait a few seconds simultaneously hold the PROGRAM and DOWN push buttons ON turn the unit ON then release the buttons The default best resolution operation will be restored when the unit has been switched OFF and then ON again PUSHBUTTON FUNCTIONS Save The first time you press the SAVE button the LED will go ON and stay on If you switch the unit off when it is turned back on again the SAVE LED will return to ON indicating there is data in memory To lose it you must erase it Each time you press the SAVE button currently displayed data is appended to any existing data There are 380 Power Torque Speed data values before you run out In the unlikely event you should a parameter on the display will flash HELP to signal that you have consumed all available memory Clear To clear data memory the SAVE and RECALL pushbuttons must be pressed simultaneously If you have nothing in memory worth saving try it you will find you have to be fairly synchronized when pressing both buttons When CLEAR is accepted all three SAVE RESET RECALL LEDs will go on while you are holding the buttons in If they are not then the CLEAR was not accepted try again Recall When the SAVE LED is ON if you depress RECALL
20. to what it is working with Neither the TORQUE or SPEED displays are affected If at some future date you should wish to re calibrate any Magtrol Dynamometer for different units of torque the process is not difficult Consult Magtrol Customer Service 3 Computer Interfacing GPIB IEEE 488 Please be sure that the computer and the 4615B are both turned OFF when you install the GPIB connector cable If you have completed the equipment check out as outlined in Chapter 1 the 4615B Dynamometer interconnection is complete Ifa Model 4629B controller is used in conjunction with the 4615B Digital Readout the computer interface should be connected to the 4629B only Please refer to your 4629B User s Manual GPIB COMPUTER INSTALLATION On most computers the GPIB interface is not a standard item An interface card must be installed and the driver software made resident on disc There are several manufacturers of these products and some systems exchange data much more rapidly than others In motor testing the test rate and speed of data acquisition is very important One recommendation is National Instruments Corp PN GPIB PC2A for IBM or compatible PC s The IEEE 488 Cable is normally supplied with the interface SOFTWARE INSTALLATION There are usually a number of formatting questions to be answered the first time that the GPIB interface control software is installed The following items pertain to the 4615B All GPIB data acquisitio
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