©
National Instruments Corp.
15
NI 9472/9474
more information abo
u
t the maxim
u
m contin
u
o
u
s o
u
tp
u
t c
u
rrent,
short-circ
u
it behavior, and short-circ
u
it trip time. Yo
u
also can
refer to the IEC 1131-2 standard for more information abo
u
t
short-circ
u
it-proof devices.
Tip
Beca
u
se the NI 9472/9474 mod
u
le incl
u
des internal
flyback diodes, yo
u
do not need to add external diodes
when connecting to switching energy storing devices.
Power Supplies and Overcurrent Conditions
If a short-circ
u
it occ
u
rs, the c
u
rrent thro
u
gh DO can exceed the
c
u
rrent rating for the power s
u
pply and the maxim
u
m contin
u
o
u
s
o
u
tp
u
t c
u
rrent for the NI 9472/9474.
If the power s
u
pply yo
u
are
u
sing with the NI 9472/9474 cannot
s
u
pply more than 13 A, the mod
u
le may be damaged if a
short-circ
u
it condition occ
u
rs.
Detecting an Overcurrent Condition
If a device connected to the mod
u
le is not working while the
channel is on, the mod
u
le channel may be in an overc
u
rrent state.
Neither the software nor the mod
u
le LEDs indicate if an
overc
u
rrent condition occ
u
rs. A channel LED may be on even if the
channel is off beca
u
se of an overc
u
rrent condition. To determine if
