Table of Contents
Advertisement
Caution
Do not connect the UMI-7774/72 isolated power to a source greater than 30 V. Doing so
may cause damage to UMI-7774/72 components.
V
and C
are redistributed to other connectors on the UMI-7774/72 as an output power source for
iso
iso
external devices. Refer to Figure 1 to locate the power input terminal block on the UMI-7774/72. Figure 13
shows the 4-position power connector. Table 1 shows the power connector terminal block pinout.
Table 1 includes descriptions of each of the terminals on the UMI-7774/72 power connector.
Terminal
V
C
V
iso
C
iso
If you do not connect a separate power supply to the V
V
terminal together and connect the C and C
iso
Note
When the drive enable output and digital output signals are in an ON state, they provide the
power connected on V
inputs that the drive enable and digital outputs are connected to. V
isolation.
Connecting Power To the UMI-7774/72
The UMI-7774/72 includes a 4-position power connector that provides voltage and common for the
main power supply as well as voltage and common for the isolated output circuitry.
Complete the following steps to wire power to the UMI-7774/72.
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-7774/72.
2.
If you are using a separate power supply for optical isolation, connect the positive lead of the
5–30 VDC supply to the V
UMI-7774/72.
3.
If you are not using the isolation feature on the UMI-7774/72, you must connect the V and V
terminal together and connect the C and C
© National Instruments Corporation
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
Table 1. Power Connector Terminals
and C
iso
terminal together.
iso
and C
. Use a power supply with a voltage that is compatible with the
iso
iso
V
C
o
V i s
o
C i s
Figure 13. UMI-7774/72 Power Input
terminal and the negative lead to the C
iso
terminal together.
iso
15
Description
Main power (24 V ±10%)
Common
Isolated power (5 to 30 VDC)
Isolated common
terminals you must connect the V and
iso
and C
do not provide safety
iso
iso
terminal on the
iso
NI UMI-7774/72 User Guide and Specifications
iso
Advertisement
Table of Contents
