National Instruments Direct Injector Driver System Manual
© 2013 National Instruments. All rights reserved.
3.3.2 Powering the System
Warning:
The external battery supply input terminals on the NI 9751 (DI Driver) and NI 9758 (PFI Driver) modules
are not reverse-voltage polarity protected. Connecting power to the module in reverse polarity will
damage the modules. This event is not covered by the warranty.
for a recommended solution for protecting a system from reverse battery polarity.
The DI Driver System requires external DC power to the following system components:
Component
Power
Terminal Label
Ground
Terminal Label
Voltage Range
Maximum
Required Power
(3-Channel System)
V
C
9-30 V
15 W
(6, 9, 12-Channel Systems)
V1
C
9-35 V
35 W
BATT (0)
GND (9)
9-32 V
75 W Each
BATT (0)
GND (9)
9-32 V
75 W
Vsup
COM
5-30 V
1 W
3.3.2.a, Power Supply Specifications for I/O Hardware
*The NI 9411 module only needs external power supplied to the screw-terminal block if 5V regulated output power is
required from the 15-pin D-Sub connector to an optical encoder. Do not connect external power to the 15-pin D-Sub.
NI recommends the following power supply options for powering the system
components:
NI Part Number Model Number Input Voltage
Output Voltage Output Current
783168-01
100-240 VAC
12-15 V
15A
781095-01
85-276 VAC
24-28 V
20A
3.3.2.b, Power Supply Recommendations for the DI Driver System
The power supplies listed above are not included with the DI Driver System, but are available through National
Instruments. There are a few considerations for selecting the proper power supply system – specifically whether to
use a 12V power supply (QS10.121) or a 24V power supply (PS-17). NI recommends using a 24V power supply in
order to increase the efficiency of the DI Driver modules’ internal boost supply. However, if an optional PFI Driver
module is used, and the associated actuators are not rated for 24V, then the lower 12V power supply should be
used.
DI Driver Systems with one or two DI Driver modules (DIDS-2003 and DIDS-2006) can typically be powered by a
single recommended supply listed above. DI Driver Systems with three or four DI Driver modules (DIDS-2009 and
DIDS-2012) should be powered by two identical supplies wired in parallel. Power supplies wired in parallel will create
a supply having the same voltage as the individual supplies, but double the current capacity.
power supply documentation for wiring instructions