User manual

FL SWITCH MM HS
2-10
PHOENIX CONTACT 6874_en_09
2.5.2 Connecting the Supply Voltage to the FL SWITCH MM HS/M
for GL-Certified Operation
24 V DC The system is operated using a 24 V DC voltage, which is applied at the head station. If
required, the voltage can also be supplied redundantly (see Figure 2-16).
Figure 2-15 Supplying the system using one voltage source
For GL-certified operation, an NEF 1- 3 filter (for Environmental Category EMC2) or
NEF 1- 6 (for EMC1) must be used and the components must be installed in a metal
control cabinet.
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 (dotted line connection)
prevents this error message. It is also possible to deactivate monitoring in web-based
management or via SNMP.
U S 1
U S 2
F a i l
R e s e t
M O D E
A C T 1 0 0 F D
F L S W I T C H M M H S
O r d . N o . 2 8 3 2 3 2 6
U S 2U S 1 G N D G N D R 1 R 2
0 0 A 0 4 5 1 B D D
M A C
A d d r e s s
V . 2 4
N E F
1 - 3
2 4 V D C
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