National Instruments NI 9751 User Manual

NI 9751 User Manual | © National Instruments | 27
Maximum module internal power dissipation .. 10 W
Maximum current drive to injectors
1
................ 40 A
Maximum recommended injection
command duration
2
........................................... 5 ms
Maximum injection events per engine cycle
3
... 16
Minimum time between injection events
4
........ 0 ms
Maximum single IPhase element duration ....... 1.6 ms
Maximum BackBoostTime............................... 1.6 ms
Maximum OneShot Time ................................. 5 ms
Maximum HVTarget Setpoint
Solenoid mode .......................................... 120 V
Piezo mode ............................................... 190 V
Maximum internal module temperature
before critical fault
5
.......................................... 85 °C
Short circuit fault threshold
(during injection events)
5
.................................. 44 A
Short circuit fault threshold
(outside injection events)
5
................................ 20 A
Open circuit fault threshold
6
............................. 1.5 A
High voltage fault threshold
5
............................ 195 A
Physical Characteristics
If you need to clean the module, wipe it with a dry towel.
Screw-terminal wiring ...................................... 1.20 mm in diameter (16 AWG)
Weight............................................................... 170 g (6.0 oz)
1
The recommended maximum time at 40 A is 100 μs.
2
Longer injection durations are possible, but you must consider the duty cycle of the driver. For example,
a single one-shot pulse on an injector test stand can safely be 200 ms. Consider injection duty cycle,
current levels, and module temperature.
3
This is a software limit. Consider overall injection duty cycle, current levels, and module temperature. The
module might overload when 16 injection events occur per engine cycle, depending on engine speed and
current levels.
4
You can configure multiple injection commands that merge. The injector requires a certain amount of time
to close the valve at the end of an injection command, which is a property of the injector.
5
These conditions cause a critical fault and shutdown operation of the module. Manually clear the faults
with software to resume operation.
6
If the current during an injection command does not exceed this level, the module reports an Open Circuit
Fault. This does not affect the operation of the driver and is for information only.

National Instruments NI 9751 Specifications

General

Brand	National Instruments
Model	NI 9751
Category	Control Unit
Language	English