Accedian EtherNID GE, Руководство администратора

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2: Hardware installation Powering the EtherNID
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48V DC via discrete power cord
It is possible to power units with a custom built 48V DC power cable. When powered in this
manner, the unit must be installed horizontally to meet all applicable safety
regulations.
Therefore , supported mounting options are desktop mounting or 1 or 2 unit rack
mounting. Wall mounting is not allowed.
On older models of the EtherNID™, the +/- 48V Return is common to both Feed A and Feed
B, whereas other models will have an isolated Return A and Return B.
To locate your serial number, please refer to the sticker on the Rear Panel of the unit. If the
serial number starts with:
• I006-… or less then the unit has a /- 48V Return
• P004-… or less then the unit has a /- 48V Return
• I007-… or more then the unit has an is/- 48V Return A and Return B
• P005-… or more then the unit has an is/- 48V Return A and Return B
The following diagram depicts the pin-out of the white +/- 48V connector on the
rear panel of the EtherNID™:
/- 48V Return Is/- 48V Return A and B
If an EtherNID™ with a /- 48V Return is being used with the Terminal Block Adapter, then the
two +/- 48V Return screws corresponding to the “RTN FEED A” and “RTN FEED B” on the Terminal
Block Adapter
must be tied together:
Terminal Block Adapter with Return Feeds tied
The power source (+/-40 to +/-57 V DC) must be limited by a 0.5A/48V fast acting fuse or
equivalent (Littelfuse 0217.500 0.50A). There should be one fuse per power feed.
Warning: Disconnect all power sources (feed A and feed B) when servicing. Removing fuses
can be used as a disconnect method.
Warning: Fuses must be installed on the live wire(s) and not on the grounded wire(s).