ZyXEL ES-3124PWR User Guide - Page 41
DC Power Connection
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3.3.2 DC Power Connection " This is only for the DC model of the Switch. Chapter 3 Hardware Overview The Switch uses a single terminal block plug with four pins which allows you to connect up to two separate power supplies. If one power supply fails the system can operate on the remaining power supply. Use two wires to connect to a single terminal pair, one wire for the positive terminal and one wire for the negative terminal. Make sure that no objects obstruct the airflow of the fans. " 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 19 Terminal Block Pairs Teminal Pair 1 Teminal Pair 2 " When installing the power wire, push it wire firmly into the terminal as deep as possible and make sure that no exposed (bare) wire can be seen or touched. 1 An exposed wire from a DC power source 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 terminal block captive screws. 2 Connect one end of a power wire to the Switch's RTN (return) pin and tighten the captive screw. 3 Connect the other end of the power wire to the positive terminal on the power supply. ES-3124 Series User's Guide 41