DPS Telecom D-PC-293-10A, Руководство пользователя

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7
Installation • Power Connection
2.3.4 Power and Ground Connection
The NetGuardian Expansion offers screw lug barrier plugs for easy and convenient power connection.
Additionally, dual power feeds are available, providing an alternate power source in case backup power becomes
necessary (optional). The expansion units will automatically draw from the alternate power source in the event
the primary power source becomes unavailable. Follow the directions below for connection information.
1. Remove the fuse from the back panel and turn off the power supply when connecting the power from the power
lead.
2. Remove the screw lug barrier plug(s) from the back panel of the NetGuardian Expansion.
3. Connect a -48VDC line to the -48V terminal and a battery ground to the GND terminal of the screw lug (All bar-
rier screws should be seated firmly but not over-tightened so as to nick the bare wire). Repeat for power source
“B” if you have dual power inputs.
4. Push the plug(s) firmly back into their appropriate location.
5. For earth/frame grounding, connect a copper wire with a ring terminal to the grounding post located on the back
panel of the NetGuardian Expansion (DPS recommends at least a 14 gauge wire). Place the ring terminal between
the two nuts and secure the nuts on the grounding post. Connect the other end of the wire to an earth/frame ground.
6. Turn on main power with the NetGuardian Expansion fuse still removed.
7. Connect the black common lead of a volt meter to battery ground and the red lead to -BATT. The meter should
read the battery level (-43 to -53VDC). If not, check your power supply.
8. Do not re-insert the NetGuardian Expanion’s fuse (powering up the unit) until all other connections have been
made.
Note:
Observe polarity when connecting battery leads. If using the -48VDC red/black cables supplied with the unit, connect
black to battery GND and red to -BATT. Standard gauge is 20AWG, but may vary between 18-24AWG.
Fig. 2.3.4 - Power screw lug barrier plugs.
Grounding
post
Insert screw lug barriers