Chapter 3
Connecting the UMI-7774/7772 to Drives and Other Devices
©
National Instruments Corporation
3-5
National Instruments UMI-7774/7772 User Manual
Figure 3-4.
UMI-7774/7772 Power Input
Table 3-1 includes descriptions of each of the terminals on the
UMI-7774/7772 power connector.
Complete the following steps to wire power to the UMI-7774/7772.
1.
Connect the positive lead of the 24 VDC power supply to the
V terminal and the negative lead to the C terminal on the
UMI-7774/7772.
2.
If you use a separate power supply, connect the positive lead of the
5–30 VDC supply to the V
iso
terminal and the negative lead to the
C
iso
terminal on the UMI-7774/7772.
3.
If you do not use the isolation feature on the UMI-7774/7772,
you must connect the V terminal to the V
iso
terminal and the C terminal
to the C
iso
terminal.
The V
iso
and C
iso
connections provide a source for the optically isolated
output signals on the UMI-7774/7772, including the drive enable outputs
and digital outputs.
Table 3-1.
Power Connector Terminals
Terminal
Description
V
Main power (24 V ±10%)
C
Common
V
iso
Isolated power (5 to 30 VDC)
C
iso
Isolated common
C
V
Viso
Ciso
