Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
©
National Instruments Corporation
3-13
National Instruments UMI-7774/7772 User Manual
Figure 3-11.
UMI-7774/7772 Optically Isolated Digital Output Circuit and Connection
to an External Device
Fault Input and Disabled Status Indicators
Each axis of the UMI-7774/7772 has the following two status LEDs:
DISABLED
and
FAULT
. If the Enable output signal is deactivated for any
reason, the
DISABLED
LED illuminates. If the Fault input signal is also
active, both the
FAULT
and the
DISABLED
LEDs for the axis illuminate.
Refer to Figure 3-5 for the locations of these LEDs.
Sinusoidal Commutation Configuration
The control connectors for axes 1 and 2 of the UMI-7774/7772 have
additional analog output signal connections to accommodate brushless
servo drives that do
not
provide onboard sinusoidal commutation. These
signal connections are shown in Table 3-3 and Table 3-4. For these types
of drives, you must use a National Instruments motion controller that
provides sinusoidal commutation. The National Instruments motion
controllers with this feature provide two analog output commands, with
a phase difference of 120 degrees, for a single axis of motion. You can
connect each UMI-7774/7772 to two brushless drives. For example,
Output
Viso
Ciso
Vcc
Load
Current Limiter
Current
Sense
UMI-7774/7772
