Black Box LPH240A-H, Руководство по эксплуатации

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Chapter 3: Installation
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3.7 LPH240A Series, DC-powered, -48VDC Installation
This section describes the proper connection of the -48VDC
leads to the DC power terminal block on the LPH240A PoE Edge Switch .
The DC terminal block on the LPH240A is located on the left side of the
unit and is equipped with three (3) screw-down lead posts. The power
terminals are identified as positive (+) and negative (-), and they are
floating inside the unit so that either of the terminals may be grounded by
the user if desired. The chassis is “earth” or ground (GND). The
connection procedure is straightforward. Simply insert the DC leads to the
LPH240A power terminals, positive (+) and negative (-) screws. The use
of Ground (GND) optional; it connects to the LPH240A chassis. Ensure
that each lead is securely tightened from the top, as shown on above
picture with arrow.
NOTE: Always use a voltmeter to measure the voltage of the
incoming power supply and figure out the +ve potential lead or -ve
potential lead. The more +ve potential lead will connect to the post
labeled “+ve” and the rest to the “-ve”.
The GND can be hooked up at the last.
When power is applied, the green PWR LED will illuminate.