National Instruments NI 9760 Manuale utente

USER MANUAL

NI 9760

NI Powertrain Controls VR/Hall Sensor Module (Rev C)

Contents

Introduction .............................................................................................................................. 1

Pinout........................................................................................................................................ 2

Hardware .................................................................................................................................. 2

Powering the Module................................................................................................................ 2

Platform Compatibility ............................................................................................................. 3

Input Channels Used for VR Sensor Inputs.............................................................................. 3

Input Channels Used for Hall-Effect Sensor Inputs ................................................................. 5

Custom Configuration .............................................................................................................. 6

Physical Specifications and Characteristics ............................................................................. 6

Electrical Specifications and Characteristics............................................................................ 6

Compliance and Certifications ................................................................................................. 7

2|ni.com |NI 9760 User Manual

Introduction

The National Instruments 9760 CompactRIO VR/Hall Sensor Module offers a set of automotive

style inputs to interface with standard automotive position sensors. It provides six channels

which may be software selected as a VR sensor or a Hall-Effect sensor input.

Features

• 6 channels software configured as VR sensor or Hall-Effect sensor inputs

– 600 kHz lowpass filter

– VR sensor inputs

• ±60 V input range

• Adaptive/manually programmable arming thresholds

– Hall-effect sensor or general purpose digital inputs

• Over/under voltage protection

• Optional software selectable pull-up resistor

• External output for each channel according to software configuration

• Sensor Power output: 5 V @ 200 mA

• LabVIEW FPGA and LabVIEW Real Time VIs for quick integration with application

NI 9760 User Manual |© National Instruments |3

Pinout

Figure 1. Pin Assignments NI 9760

Hardware

NI recommends using the NI 9923 Connector Kit for connections to the NI 9760. The NI 9923

provides proper strain relief for NI 9760 connections. Visit ni.com/info and enter Info Code

VRHALL for more information on parts and accessories for the NI 9760

Powering the Module

The CompactRIO backplane male high density DSUB 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 functions. The CompactRIO 5 V source is active whenever the

CompactRIO or R Series Expansion Chassis is properly powered. You can power the NI 9760

only at the HD15 connector by plugging it into a CompactRIO or R Series Expansion Chassis.

Do not connect the HD15 connector to any other device.

If the 5V OUT lines or internal pull-up resistors are to be used for Hall-effect sensors, then the

external DB-37 connector pins labeled 5-30V IN (19) and GND (36) must be connected to an

external supply of 5V to 30V. The module is reverse battery protected to -30V. The NI 9760

external power ground and CompactRIO backplane power ground are isolated and have no

internal connection.

5 V OUT

IN + 1

IN + 2

IN + 3

IN + 4

IN + 5

IN + 6

GND

OUT 2

OUT 4

5 – 30 V IN

OUT 6

5 V OUT

IN – 1

IN – 2

IN – 3

IN – 4

IN – 5

IN – 6

GND

OUT 1

OUT 3

OUT 5

GND

4|ni.com |NI 9760 User Manual

Caution The external battery supply input terminals are reverse voltage protected

to -30 V. Connecting the NI 9760 in reverse polarity at voltages greater than -30 V or

forward polarity at greater than +30 V will result in damage. This event is not covered

by warranty.

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:

• CompactRIO, which consists of a CompactRIO controller, chassis, or integrated

controller/chassis.

• 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.

• MXI-Express, Ethernet and EtherCAT expansion chassis.

Note NI Powertrain Control modules are not compatible with the National

Instruments CompactDAQ chassis.

Note NI Powertrain Control modules do not support Scan Interface mode.

Input Channels Used for VR Sensor Inputs

The VR Hall module provides up to six identical VR sensor inputs. A Variable Reluctance (VR)

sensor is a standard production automotive speed sensor. It is an electromagnetic sensing device

containing a winding of wire around a permanent magnetic core. It relies on the movement of

ferrous material (steel teeth) past the tip of the sensor to change the magnetic flux of the sensor.

This creates a voltage pulse across the leads of the sensor's wire coil. Figures 4 and 5 below show

a typical VR signal with respect to toothed wheels, as shown in figures 2 and 3. The VR signal

will go positive as a tooth approaches the sensor tip. The signal will then rapidly swing back

through zero precisely at the center of the tooth. As the tooth moves away from the sensor tipthe

voltage will continue in the negative direction and then return to zero.

Figure 2. Positive Tooth Trigger Wheel

NI 9760 User Manual |© National Instruments |5

Figure 3. Negative Tooth Trigger Wheel

Figure 4. Correct Signal Polarity for VR Input Circuit

Figure 5. Incorrect Signal Polarity for VR Input Circuit

Each VR sensor input requires two connections. The VR Hall module pins labeled IN 1+ through

IN 6+ are the positive sensor inputs. The negative sensor inputs must be connected module pins

labeled IN 1- through IN 6-. The polarity of the sensor connection to the module is critical. The

leads of the sensor should be connected such that the positive input of the VR circuit sees the

waveform shown in Figure 4. The waveform shown Figure 5 is incorrect, and the VR circuit will

not properly respond to this waveform. The rapid zero crossing of the VR signal must be in the

negative direction.

The polarity of the physical tooth or gap on the trigger wheel will contribute to the polarity of

the voltage pulse from the sensor. Figure 2 demonstrates a positive physical tooth polarity and

Figure 3 demonstrates a negative physical tooth polarity. Assuming the lead polarity of a sensor

remained the same, one of the configurations would generate the waveform shown in Figure 4,

while the other configuration would generate the waveform shown in Figure 5. Triggers wheels

are designed so that the physical center of each tooth or gap corresponds to a known angular

position of the wheel. This physical center of the tooth or gap always corresponds to the rapid

zero-crossing of the generated voltage pulse.

The VR circuit is designed so that the rapid negative zero-crossing of the raw sensor signal

corresponds to the rising edge of a digital pulse sent to the RIO FPGA. The VR output signal to

the FPGA will go TRUE at the rapid negative zero crossing of the external VR pulse and remain

TRUE until the external VR pulse rises above the arming threshold voltage. An example of this

is shown in Figure 6. Within LabVIEW FPGA the system designer can route this digital signal

to the EPT CrankSig or CamSig input. The signal can also be routed to any other speed

measurement sub-VI.

6|ni.com |NI 9760 User Manual

Figure 6. VR Input Pulse and Resulting Digital Output from VR circuit

The absolute maximum VR pulse amplitude allowed by the circuit is ±60 V. If the input signal

exceeds this voltage, damage may occur to the circuit. The amplitude should not exceed ±60 V

at maximum engine speed. The minimum VR pulse amplitude that will generate a digital output

by the VR circuit is ±30 mV.

The VR circuit implements adaptive noise rejection features during continuous incoming VR

pulses while in adaptive threshold mode. In general, an adaptive arming threshold voltage is

generated with each VR pulse at 33% of the previous pulse amplitude. The next pulse must have

an amplitude that exceeds the arming threshold in order for a digital output to be generated at

the rapid zero-crossing. If no arming event occurs for 85ms, the arming threshold is reset to

30 mV.

Alternately, a manually set arming threshold can be defined.

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, then the amplitude at 2000 RPM will be ±20 V. By using an oscilloscope

to measure the VR amplitude at a low speed, this relationship can be used to determine what the

maximum amplitude will be at the maximum speed. If the maximum amplitude of ±60 V will be

exceeded at maximum speed, then the sensor gap must be increased.

Input Channels Used for Hall-Effect Sensor

Inputs

The VR Hall module provides up to six identical hall-effect sensor input circuits. When using

hall sensors, the ground of the sensor should be connected to the IN - side of an input channel

and one of the GND pins. If the hall sensor has an opencollector output, requiring a pull-up

resistor at the collector, a pull-up resistor can be engaged through software. You must use an

external power supply to use the pull-up resistor.

The circuit's output to the RIO FPGA goes high when the input voltage is greater than the

manually set threshold voltage. The output goes low when the input is less than the manually set

threshold voltage.

Custom Configuration

Visit ni.com/info and enter Info Code ADCOMBO for more information about custom

configuration.

NI 9760 User Manual |© National Instruments |7

Physical Specifications and Characteristics

Weight............................................................... 170 g

Maximum Altitude ........................................... 2000 m

Operating Temperature ..................................... -40 °C to 60 °C

Maximum Ambient Temperature ..................... 60 °C

Operating Humidity.......................................... 10% to 90% RH, non-condensing

Pollution Degree ............................................... 2

Ingress Protection ............................................. IP40

For indoor use only.

If you need to clean the module, wipe it with a dry towel.

Electrical Specifications and Characteristics

External Power

Input Range............................................... 5 to 30 VDC Max

Reverse Polarity Protection ...................... -30 V

5 V Regulated Output

Voltage Tolerance ............................. 5 V 3%, Vsup 6 V

Current .............................................. 200 mA

Short-circuit Protection..................... 400 mA

Inputs

Arming Threshold Digital to Analog

Conversion Range..................................... 0 to 4.096

Arming threshold Digital to Analog

Resolution ................................................. 10 bit

Arming Threshold Range

(Differential Voltage at ExternalPins) ...... 0 to 2.97V

Lowpass Filter .......................................... 600 kHz

Lag time From VR Neg. Zero Crossing

Event to Digital Output Rising Edge........ 3 us

Peak Voltage ............................................. ±60V

Outputs

Voltage Standard....................................... 5 V TTL

Reverse Polarity Protection ...................... ±8 mA

8|ni.com |NI 9760 User Manual

Safety Guidelines

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:

• IEC 61010-1, EN 61010-1

• 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:

• EN 61326-1 (IEC 61326-1): Class A emissions; Industrial immunity

• EN 55011 (CISPR 11): Group 1, Class A emissions

• AS/NZS CISPR 11: Group 1, Class A emissions

• FCC 47 CFR Part 15B: Class A emissions

• ICES-001: Class A emissions

Caution When operating this product, use shielded cables and accessories.

CE Compliance

This product meets the essential requirements of applicable European Directives as follows:

• 2006/95/EC; Low-Voltage Directive (safety)

• 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.

376292A-01 Mar16

Refer to the NI Trademarks and Logo Guidelines at ni.com/trademarks for more information on NI trademarks. Other product and company

names mentioned herein are trademarks or trade names of their respective companies. For patents covering NI products/technology, refer to the

appropriate location: Help»Patents in your software, the patents.txt file on your media, or the National Instruments Patents Notice at

ni.com/patents. You can find information about end-user license agreements (EULAs) and third-party legal notices in the readme file for your

NI product. Refer to the Export Compliance Information at ni.com/legal/export-compliance for the NI global trade compliance policy

and how to obtain relevant HTS codes, ECCNs, and other import/export data. NI MAKES NO EXPRESS OR IMPLIED WARRANTIES AS TO THE

ACCURACY OF THE INFORMATION CONTAINED HEREIN AND SHALL NOT BE LIABLE FOR ANY ERRORS. U.S. Government Customers: The data

contained in this manual was developed at private expense and is subject to the applicable limited rights and restricted data rights as set forth in

FAR 52.227-14, DFAR 252.227-7014, and DFAR 252.227-7015.

Waste Electrical and Electronic Equipment (WEEE)

EU Customers At the end of the product life cycle, all products must be sent to

a WEEE recycling center. For more information about WEEE recycling centers,

National Instruments WEEE initiatives, and compliance with WEEE Directive

2002/96/EC on Waste and Electronic Equipment, visit ni.com/environment/

weee.

Battery Replacement and Disposal

Battery Directive This device contains a long-life coin cell battery. If you need

to replace it, use the Return Material Authorization (RMA) process or contact an

authorized National Instruments service representative. For more information

about compliance with the EU Battery Directive 2006/66/EC about Batteries

and Accumulators and Waste Batteries and Accumulators, visit ni.com/

environment/batterydirective.

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go to ni.com/environment/rohs_china.)

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