Dell S25N Посібник із швидкого старту - Сторінка 13

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Step

Task

Connect the -48 V and -48 V RTN (Return) cables to the switch

terminals and then to the remote power sources.

Replace the safety covers on the DC terminal block.

S25P

The S25P has two AC power supplies acting in load-sharing mode or can be

used independently. Use the power cords shipped with the S25P to connect it to

AC power outlets, ideally on separate circuits. Several versions of the power

cord are available, based on country requirements.

S25P-DC

The PSU side of the S25P-DC contains two terminal blocks for two DC power

supply inputs acting in load-sharing mode. The left terminal block, as you face

the PSU side, corresponds to the DC2 status LED on the I/O side of the switch;

DC1 is on the right. Cables must be sized for 11.5 A service at -48VDC input

(per NEC in the United States. Internationally, follow local safety codes.)

Step

Task

Make sure that the remote power source (the circuit breaker panel) is in

the OFF position.

Remove the safety cover from the DC terminal block.

Connect the grounding cable to the FG terminal first, then connect the

opposite end to the appropriate grounding point at your site to ensure an

adequate chassis ground.

Connect the -48 V and -48 V RTN (Return) cables to the switch

terminals and then to the remote power sources, ideally on separate

circuit breakers.

Replace the safety covers on the DC terminal blocks.

If you are connecting both terminal blocks, do not supply power until

both terminal blocks are connected. You can supply power to either one

or both. The S25P-DC uses the power supplies in load-sharing mode

and does not set a precedence for either power source. Failover is

hitless.

Installing the Hardware