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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-78
xx
R
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
