DPS Telecom NetGuardian 480 User Manual page 13

3. Connect a –48 VDC line to the –48V terminal and a battery ground to the GND terminal of the screw lug.
Seat the barrier screws firmly, but be careful not to nick the bare wire. Repeat for power source B if you have
dual power inputs.
Note: Observe polarity when connecting battery leads. If using the –48 VDC red/black cables supplied with the
unit, connect the black lead to battery GND and the red lead to –BATT. Standard gauge is 20 AWG, but may
vary between 18 to 24 AWG.
4. Push the plug firmly back into its socket. Note that this connection is keyed and the plug must be properly
aligned within the socket.
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 480. DPS Telecom recommends wire of at least 14 gauge. 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. With the NetGuardian 480 fuse still removed, turn on the power supply.
7. Connect the black common lead of a voltmeter to the GND terminal and the red lead to the –48V terminal.
The voltmeter should read between –43 and –53 VDC. If the reading is outside this range, check your power
supply.
8. Do not power the unit until all connections have been made.
9. Insert the fuse to power the NetGuardian 480. The power LED by the power feed will light GREEN.
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