Siemens SIMATIC NET RUGGEDCOM RST916C Installation Manual page 25

Installing the Device
2.5.1 Connecting AC or DC Power
Each variant of the RUGGEDCOM RST916C features dual power supply inputs to
allow for redundant connections to separate, independent external power supplies.
Depending on the device variant, the following are supported:
•
•
Each power supply terminal block provides reverse polarity protection.
To connect an external AC or DC power source to the device, do the following:
Note
For examples of the supported wiring configurations, refer to "Wiring
Examples" (Page 18).
Electrocution hazard – risk of personal injury
When only one AC/DC power source is connected to the device, the redundant
power terminals (between the positive/live and chassis/ground terminals, and
between the negative/neutral and chassis/ground terminals) are energized. To
prevent contact with the terminals and avoid an electrical shock, do the following
when one AC/DC power source is connected to the device:
•
•
1.
2.
16
One AC power source and one DC power source
Two DC power sources
WARNING
Make sure a terminal block is installed in the unused port and that any wires
from the secondary terminal block are properly terminated
Make sure the first power source is off before connecting (or disconnecting) a
second power source
If connecting a secondary power source, make sure the power source currently
connected to the device is disabled (e.g. power cable is unplugged from the wall
receptacle).
Insert the appropriate terminal block(s) into the device and tighten both screws.
RUGGEDCOM RST916C
Installation Manual, 04/2023, C79000-G8976-1490-07