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Safety Guidelines
High Voltage The NI 9751 normally operates at voltages up to 190 V. Take
extreme care to protect against shock. Even when the NI 9751 is completely powered
off, allow approximately three minutes for the internal high voltage to dissipate. Do
not touch any of the module screw terminals or injector terminals while the NI 9751
is powered on.
Caution Do not operate this module in a manner not specified in these operating
instructions. 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.
Caution The fuse illustrated in Figures 32 and 33 is user-supplied and required in
all instances.
Introduction
The NI 9751 Direct Injector (DI) Driver Module includes the following components:
• CompactRIO (cRIO) module with the following components for driving a variety of diesel
and gasoline DIs, including many piezo actuated injectors:
– 3-channel solenoid injector drivers
– 2-channel piezo injector drivers (in piezo mode)
– Up to 120 V internal boost power supply in solenoid mode
– Up to 190 V internal boost power supply in piezo mode
– Up to 40 A peak current drive
– 7 V to 32 V battery
– Optional external input for high voltage supply (up to 190 V)
• Internal boost supply automatically shuts down when external high voltage
applied is greater than 24 V
– Circuit protection and diagnostics features, including:
• Protected against INJ± short to battery/high voltage
• Protected against INJ± short to GND
• Internal power supply overload protection
• Internal power supply over-charge protection
• Module temperature protection
• Open circuit detection
• Fault flags reported for all above conditions
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