Mounting and installation
7966_en_04
PHOENIX CONTACT
2-3
2.2
Installing the FL NAT SMN 8TX(-M)
2.2.1
Connecting the 24 V DC supply voltage
The FL NAT SMN 8TX(-M) is operated using a 24 V DC voltage, which is applied via
COMBICON. If required, the voltage can also be supplied redundantly (see Figure 2-4).
Figure 2-3
Supplying the FL NAT SMN 8TX(-M) using one voltage source
Redundant 24 V DC supply
Figure 2-4
Supplying the FL NAT SMN 8TX(-M) using two voltage sources
If redundant power supply monitoring is active (default setting), an error is indicated if only
one voltage is applied. A bridge between US1 and US2 prevents this error message. It is
also possible to deactivate monitoring in web-based management or via SNMP.
OUT
24 V DC
US1 GND US2 GND R1 R2
In order to reset the FL NAT SMN 8TX(-M) on power up, the power supply must be
interrupted for at least 3 seconds.
OUT
24 V DC
24V
24V
0V
0V
US1 GND US2 GND R1 R2