NI 9758 Manual
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© National Instruments
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3
Hardware
The NI 9758 provides four port fuel injector drivers and four general purpose low-side solenoid
drivers in a NI CompactRIO module.
Powering the Module
The NI 9758 requires power from two different sources, a 15-pin D-SUB (HD15) connector and
the external screw-terminal connector.
The CompactRIO backplane male high density D-SUB 15-pin (HD15) connector mates with the
module’s female HD15 connector. This power source provides a regulated 5 V and ground to
various digital logic functions within the module. The CompactRIO 5 V source is active
whenever the CompactRIO or R Series Expansion Chassis is properly powered. The NI 9758
should only be powered at the HD15 connector by plugging it into a CompactRIO or R Series
Expansion Chassis. The NI9758 HD15 connector should not be connected to any other device.
The external screw-terminal connector with the terminals labeled BATT (0) and GND (9)
provide a second power source. Typical power sources will be from automotive 12 V or 24 V
battery systems. The NI 9758 can accept power from 7 V to 32 V. The NI 9758 requires a
maximum of 100 mA from an external power supply. When actuators and injectors are
connected to and powered from the same power supply as the NI 9758, a battery or power supply
capable of 10 A continuous output will be required under a full load.
The NI 9758 requires both external power and power from the CompactRIO backplane. The high
current path is directed through the BATT and GND terminals on the front of the NI 9758, not
through the HD15 backplane connector.
Note
The NI 9758 will not be recognized by software without both power supplies
active.
Caution
The external battery supply input terminals are not reverse voltage
polarity protected. Connecting power to the NI 9758 in reverse polarity will damage
the NI 9758. This event is not covered by the warranty
