NI 9752 Automotive AD Combo Module User Manual
Contents
1. By using an oscilloscope to measure the VR amplitude at a low speed you can use this relationship to determine the maximum amplitude at the maximum speed If the maximum amplitude of 60 VDC will be exceeded at maximum speed you must increase the sensor gap or obtain a custom VR circuit configuration from NI Hall Effect Sensor Inputs The NI 9752 includes two identical Hall effect sensor input circuits The Hall effect inputs take a digital input from a Hall effect or proximity sensor Typical sensors include an open collector output that requires a pull up resistor at the collector The Hall effect inputs read active TTL compatible signals The standard configuration includes a 4 7 k pull up to 5 V for use with open collector type inputs The input is protected against typical automotive battery voltages and can be connected to actively driven battery voltage signals Channels with this configuration are protected from voltage swings of 30 V NI 9752 User Manual National Instruments 9 The circuit output to the RIO FPGA reverses the polarity of the input by going low when the input voltage is greater than 2 0 V The output goes high when the input is less than 1 0 V Figure 11 shows the standard configuration of the Hall effect sensor input circuits Figure 11 Hall Effect Circuit Input Configuration VCC PU Hall Input Hall a Standard Circuit Configuration The NI 9752 comes with a standard config2. automotive temperature sensors are thermistors with a maximum cold resistance of approximately 100 kQ and a resistance of approximately 100 Q at 150 C The pull up resistor of 1 kQ provides a usable output voltage range for thermistors of this type When used as a switch input the switch must short to ground when it is closed 6 nicom NI 9752 User Manual Figure 5 Analog Input Configuration for Thermistors and Switches VCC PU Thermistor Switch Input Thermistor VR Sensor Inputs The NI 9752 provides two identical VR sensor inputs A VR sensor input is a standard low cost electromagnetic sensing device that contains a winding of wire around a permanent magnetic core The VR sensor relies on the movement of ferrous material or steel teeth past the tip of the sensor to change the magnetic flux of the sensor This movement creates a voltage pulse across the leads of the wire coil Figures 8 and 9 show a typical VR signal with respect to toothed wheels as shown in Figures 6 and 7 The VR signal is positive when a tooth approaches the sensor tip and then rapidly swings back through zero precisely at the center of the tooth As the tooth moves away from the sensor tip the voltage continues in the negative direction and then returns to zero The polarity of the physical tooth or gap on the trigger wheel contributes to the polarity of the voltage pulse from the sensor Figure 6 demonstrates a positive physical tooth
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4. polarity and Figure 7 demonstrates a negative physical tooth polarity Assuming the lead polarity of a sensor remains the same one of the configurations generates the waveform shown in Figure 8 and the other configuration generates the waveform shown in Figure 9 Figure 6 Positive Tooth Trigger Wheel NI 9752 User Manual National Instruments 7 Figure 7 Negative Tooth Trigger Wheel Figure 8 Correct Signal Polarity for VR Input Circuit vee Figure 9 Incorrect Signal Polarity for VR Input Circuit lh Each VR sensor input requires a positive sensor connection and a negative sensor connection Connect a positive sensor input to one of the NI 9752 pins labeled VR1 and VR2 Connect the negative sensor inputs to GND pins on the NI 9752 The polarity of the sensor connection to the NI 9752 is critical Connect the leads of the sensor so that the positive input of the VR circuit receives the waveform shown in Figure 8 The waveform shown Figure 9 is incorrect and the VR circuit does not properly respond to this waveform The rapid zero crossing of the VR signal must be in the negative direction The physical center of each tooth or gap corresponds to a known angular position of the trigger wheel This physical center of the tooth or gap always corresponds to the rapid zero crossing of the generated voltage pulse 8 nicom NI 9752 User Manual The rapid negative zero crossing of the raw sensor signal corres
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6. EC 61010 1 EN 61010 1 e UL 61010 1 CSA 61010 1 Electromagnetic Compatibility This product meets the requirements of the following EMC standards for electrical equipment for measurement control and laboratory use e EN 61326 1 IEC 61326 1 Class A emissions Industrial immunity e EN 55011 CISPR 11 Group 1 Class A emissions e AS NZS CISPR 11 Group 1 Class A emissions 12 nicom NI9752 User Manual FCC 47 CFR Part 15B Class A emissions e ICES 001 Class A emissions A Caution When operating this product use shielded cables and accessories CE Compliance CE This product meets the essential requirements of applicable European Directives as follows e 2006 95 EC Low Voltage Directive safety e 2004 108 EC Electromagnetic Compatibility Directive EMC Environmental Management NI is committed to designing and manufacturing products in an environmentally responsible manner NI recognizes that eliminating certain hazardous substances from our products is beneficial to the environment and to NI customers For additional environmental information refer to the Minimize Our Environmental Impact web page at ni com environment This page contains the environmental regulations and directives with which NI complies as well as other environmental information not included in this document Waste Electrical and Electronic Equipment WEEE K EU Customers At the end of the product life cycle all products must be sent to a WEE
7. USER MANUAL NI 9752 NI Powertrain Controls Automotive AD Combo Module Contents Eann KOLOLO TENTON a APEE ses sen dassedssaseacins ods oducdacduceta dated secdaieisadiaadaas his dhs RET Joda O o A EANA A ENO E E A I EE O R Hardware ssesssseseeeeeeeee Powering the Module Platform Compatibility Analog Puts eeens ii e EE EEE AES S OE R EEE sab seusesscssssieusvecedecsinesten VR Sensor Inputs s slesessscsdssssasstecessceccvesessesdesaeidedsoscesseastastesvaavasyeevsands ide EEEE EEE OSa ENNEK ES 7 Hall Effect Sensor Inputs Standard Circuit Configuration Custom Configuration cceceeeeeeeeeeees Physical Specifications and Characteristics ccccceccesessesseesecseeseeseeseeeeeeeeeeeecescesesaeeaeeaseneease 12 Compliance and Certifications cccccccecseccescssessesseseecsecseceecsecseeseeseeseesesseseeceeceseeaeeaeeaeenseaes 12 Qy NATIONAL p INSTRUMENTS Introduction The National Instruments 9752 CompactRIO AD Combo Module includes automotive style analog and digital inputs to interface with standard automotive sensors Features e 21 Ch Analog inputs 12 bit A D Converter 4 ksps per channel Manually configurable optional pull up pull down and divide resistors Anti aliasing filter per channel Dedicated 2 5 V precision reference e 2 Ch VR sensor inputs 60 VDC input range Adaptive arming threshold e 2 Ch Hall effect sensor or general purp
8. ation Pull up Pull down Divide Break Channel Resistor Resistor Resistor Frequency Intended Use 1 4 7 KQ open 0Q 150 kHz Hall Proximity Switch or TTL 2 4 7 KQ open 0Q 150 kHz Hall Proximity Switch or TTL NI 9752 User Manual National Instruments 11 Custom Configuration Visit ni com info and enter Info Code ADCOMBO for more information about custom configuration Physical Specifications and Characteristics Weight ei annei r pa 145 g Maximum Altitude ceeeeeseeseeseceeeneeneeeee 2000 m Operating Temperature ceeceeeceeeteenseeee 40 C to 70 C Maximum Ambient Temperature 70 C Operating Humidity 0 0 cece ceeeceeceeceeenseneeeee 10 to 90 RH noncondensing Pollution Degree cccceecceccesceseeseesseneeeeneenee 2 Ingress Prot ctionis nicin is IP40 For indoor use only If you need to clean the module wipe it with a dry towel Safety Guidelines A Caution Do not operate this module in a manner not specified in these operating instructions Do not exceed the 60VDC rating Product misuse can result in a hazard You can compromise the safety protection built into the product if the product is damaged in any way If the product is damaged return it to National Instruments for repair Compliance and Certifications Safety This product meets the requirements of the following standards of safety for electrical equipment for measurement control and laboratory use e T
9. ct the HD15 connector to any other device Do not connect A 5 VDC power to the 5 V outputs of the DB 37 connector Platform Compatibility NI Powertrain Control modules require a hardware support system to function You cannot use the modules independently or interfaced with third party devices at the backplane HD15 connector NI Powertrain Control modules are compatible with the following National Instruments platforms e CompactRIO which consists of a CompactRIO controller chassis or integrated controller chassis e NI PXI which consists of any NI PXI chassis NI PXI RT controller and NI PXI 78xxR R Series FPGA card The NI Powertrain Control modules insert into an NI R Series expansion chassis Connect an NI R Series expansion chassis to the NI PXI FPGA card using a SHC68 68 RDIO cable Note NI Powertrain Control modules are not compatible with the National Instruments CompactDAQ chassis You can use NI Powertrain Control modules with NI cRIO 91 1x NI cRIO 907x and NIR Series Expansion systems under the following conditions e Leave one empty chassis slot between NI Powertrain Control modules and other NI modules e Maintain an ambient system operating temperature of 0 C to 45 C Note Typical specifications of National Instruments modules might not apply when used in a system with NI Powertrain Control modules A Note National Instruments guarantees warranted specifications for all National Instruments modules exce
10. ose digital inputs Digital input with inverting Schmitt trigger hysteresis Short circuit protection Optional pull up pull down and divide resistors Analog filter for noise rejection e Sensor power output at DB 37 connector pins 18 19 and 37 5Vat100mA 2 nicom NI 9752 User Manual Pinout Figure 1 Pin Assignments NI 9752 i Hardware In addition to the listed analog and digital inputs the NI 9752 provides sensor power and ground The cRIO chassis backplane directly provides sensor power Ensure that sensors do not draw more than a total of 100 mA NI recommends using the NI 9923 Connector Kit for connections to the NI 9752 The NI 9923 provides proper strain relief for NI 9752 connections Visit ni com info and enter Info Code ADCOMBO for more information on parts and accessories for the NI 9752 Powering the Module The NI 9752 requires power from the CompactRIO backplane male high density D SUB 15 pin HD15 connector which mates with the female HD15 connector on the module This power source provides a regulated 5 V and ground to various digital logic and analog functions within the NI 9752 The CompactRIO 5 V source is active whenever the CompactRIO or R Series Expansion Chassis is properly powered You can power the NI 9752 only at the HD15 connector by plugging it into a CompactRIO or R Series Expansion Chassis NI 9752 User Manual National Instruments 3 Caution Do not conne
11. ponds to the rising edge of a digital pulse sent to the RIO FPGA The VR output signal to the FPGA becomes TRUE at the rapid negative zero crossing of the external VR pulse and remains TRUE until the external VR pulse returns to 0 V shown in Figure 10 Within LabVIEW FPGA the system designer can route this digital signal to the EPT CrankSig input EPT CamSig input or any other speed measurement subVI Figure 10 VR Input Pulse and Resulting Digital Output from VR circuit sss MS es The absolute maximum VR pulse amplitude the circuit allows is 60 VDC If the input signal exceeds this voltage damage might occur to the circuit The amplitude must not exceed 60 VDC at maximum engine speed The minimum VR pulse amplitude that generates a digital output by the VR circuit is 200 mV The VR circuit implements adaptive noise rejection features during continuous incoming VR pulses In general an adaptive arming threshold voltage is generated with each VR pulse and bleeds down thereafter The next pulse must have an amplitude that exceeds the arming threshold for a digital output to be generated at the rapid zero crossing The initial arming threshold is set to approximately 70 of the amplitude of each pulse Given a constant gap between the sensor and the trigger teeth the amplitude of a VR pulse is directly proportional to the speed of the trigger wheel For example if the VR amplitude at 1000 RPM is 10 V the amplitude at 2000 RPM is 20 V
12. pt thermocouple modules when used in a system with NI Powertrain Control modules Note National Instruments recommends the NI 9214 for thermocouple measurements in CompactRIO systems using NI Powertrain Control modules a Note NI Powertrain Control modules do not support Scan Interface mode auto detection or ID mode Analog Inputs All analog inputs are single ended inputs similar to production automotive ECU analog inputs and provide filtering and over under voltage protection For best results the NI 9752 must provide the power and ground of the sensors The standard channel configuration provides an NI recommended pull up or pull down for every input to facilitate open defective sensor faults 4 nicom NI9752 User Manual Standard Channel Configuration Generic Analog Input Circuit Figure 2 shows the generic schematic representation of all analog inputs The NI 9752 standard channel configuration includes a mixture of channel configurations according to the circuits described below Figure 2 Unconfigured Generic Analog Input Circuit Schematic VCC PU Unconfigured Input Divided Inputs Figure 3 shows the analog input circuit configuration for measuring voltages from 0 V to 33 V This is standard configuration for Channels 1 through 3 in the NI 9752 Channels with this configuration are protected from voltage swings of 50 V Figure 3 Analog Input Configuration for 0 V to 33 V Inputs VCC PU Di
13. uration as illustrated in Table 1 below Table 1 Standard Analog Configuration Pull up Pull down Divide Break Channel Resistor Resistor Resistor Frequency Intended Use 1 open 1 kQ 5 6 k 200 Hz 33 V Measurement 2 open 1 kQ 5 6 k 200 Hz 33 V Measurement 3 open 1 kQ 5 6 kQ 200 Hz 33 V Measurement 4 open 51 KQ oQ 500 Hz Active Pot 5 open 51 kQ 0Q 500 Hz Active Pot 6 open 51 KQ oQ 500 Hz Active Pot 7 open 51 kQ 0Q 500 Hz Active Pot 8 open 51 KQ oQ 500 Hz Active Pot 9 open 51 kQ 0Q 500 Hz Active Pot 10 open 51 KQ oQ 500 Hz Active Pot 10 nicom NI9752 User Manual Table 1 Standard Analog Configuration Continued Pull up Pull down Divide Break Channel Resistor Resistor Resistor Frequency Intended Use 11 open 51 kQ 0Q 500 Hz Active Pot 12 open 51 kQ oQ 500 Hz Active Pot 13 open 51 kQ oQ 500 Hz Active Pot 14 open 51 kQ oQ 500 Hz Active Pot 15 open 51 kQ oQ 500 Hz Active Pot 16 open 51 kQ oQ 500 Hz Active Pot 17 1 kQ open oQ 500 Hz Thermistor Switch 18 1 kQ open oQ 500 Hz Thermistor Switch 19 1 kQ open oQ 500 Hz Thermistor Switch 20 1 kQ open oQ 500 Hz Thermistor Switch 21 1 kQ open oQ 500 Hz Thermistor Switch 22 2 5 V 0 2 Precision Reference Table 2 Standard VR Configuration Channel VR Amplitude Voltage 1 60 VDC 2 60 VDC Table 3 Standard Hall Configur
14. vided Input NI 9752 User Manual National Instruments 5 Active Inputs Potentiometer Inputs Figure 4 shows the analog input circuit configuration for both active drive analog sensors and potentiometers for measuring voltages from 0 V to 5 V This is the standard configuration for Channels 4 through 16 in the NI 9752 Channels with this configuration are protected from voltage swings of 30 V This circuit utilizes a weak pull down for open circuit detection If the channel is connected to a potentiometer the pull down slightly modifies the voltage the A D converter receives You must perform a full potentiometer calibration because the voltage from this circuit does not readily correlate to the voltage resulting from an input circuit without a pull down Examples of potentiometers are throttle position and pedal position sensors Figure 4 Analog Input Configuration for Active Sensors and Potentiometers VCC VCC PU Potentiometer Active Input POT Thermistor Inputs Switch Inputs Figure 5 shows the analog input circuit configuration for thermistors and switches to measure voltages from 0 V to 5 V This is standard configuration for Channels 17 through 21 in the NI 9752 Channels with this configuration are protected from voltage swings of 30 V Thermistor inputs have a strong pull up to create a voltage divider with the sensor Refer to the sensor datasheet for sensor resistance curves Most production
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