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Chapter 3 Hardware Overview
GS-4012F/4024 User’s Guide
50
3.3.2 DC Power Connection
" This is only for the DC model of the Switch.
The DC-powered unit uses a single terminal block with four terminals which allows you to
connect two power supplies. If one power supply fails the system can operate on the remaining
power supply. Use two wires to connect a single terminal pair, one wire for the positive
terminal and one wire for the negative terminal.
" The current rating of the power wires must be greater than 20 Amps. The
power supply to which the Switch connects must have a built-in circuit breaker
or switch to toggle the power.
Figure 18 Terminal Block Pairs
" When installing the Switch power wire, push the wire firmly into the terminal as
deep as possible and make sure that no exposed (bare) wire can be seen or
touched.
Exposed power wire is dangerous. Use extreme care when
connecting a DC power source to the device.
To connect a power supply:
1 Use a screwdriver to loosen the screws on a terminal pair.
2 Connect one end of a power wire to the Switch’s RTN (return) terminal and tighten the
terminal screw.
3 Connect the other end of the power wire to the positive terminal on the power supply.
4 Connect one end of a power wire to the Switch’s -48V (input) terminal and tighten the
terminal screw.
5 Connect the other end of the power wire to the negative terminal on the power supply.
6 Insert the terminal block plug in the Switch’s terminal block header.
Terminal
Pair 1
Terminal
Pair 2