Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
National Instruments UMI-7774/7772 User Manual
3-6
ni.com
Connector Descriptions
The following sections include voltage considerations for the connectors
on the UMI-7774/7772 as well as descriptions of the connectors and
signals.
Power Input Terminal Block
The UMI-7774/7772 requires a 24 VDC power supply to operate. The
UMI-7774/7772 has a 4-position terminal block for wiring 24 VDC power
and 5 to 30 VDC isolated power to the UMI-7774/7772. The isolated power
is used in the optical isolation output circuitry for the drive enable outputs
and digital output signals. Isolation can help break ground loops in the
system and reduce the effects of noise and voltage transients.
V
iso
and C
iso
are redistributed to other connectors on the UMI-7774/7772 as
an output power source for external devices. Refer to Figure 3-1 to locate
the power input terminal block on the UMI-7774/7772. Figure 3-4 shows
the 4-position power connector. Table 3-1 shows the power connector
terminal block pinout.
Note
When the drive enable output and digital output signals are in an ON state, they
provide the isolated power connected on V
iso
and C
iso
. Use an isolated power supply with
a voltage that is compatible with the inputs that the drive enable and digital outputs are
connected to. V
iso
and C
iso
do
not
provide safety isolation.
Power Status Indicators
When you finish making the required power connections to the V, C,
V
iso
, and C
iso
terminals, power on the 24 VDC power supply. The
V
LED
illuminates. If the 24 VDC power supply has also been connected to the
V
iso
and C
iso
terminals, the
V
iso
LED illuminates. If you are using a separate
power supply to provide isolation, power on the separate 5 to 30 V power
supply and the
V
iso
LED indicator illuminates. Refer to Figure 3-1 for an
illustration of the V and V
iso
LEDs.
Control Connector for Each Axis
Each axis connected to the UMI-7774/7772 has a 15-pin D-SUB control
connector to which you wire drive command and drive enable signals.
Figure 3-5 shows the pin locations of the control connector for each axis.
Table 3-2 shows the corresponding signals for each pin.
