Power Connection - DPS Telecom NetGuardian 832A G5 User Manual

6.3

Power Connection

The NetGuardian has two screw terminal barrier plug power connectors, located on the left side of the back
panel. (See Figure 6.3.1.)
The Grounding Lug on the back of the unit provides a permanent connection to earth
ground when connected. The Grounding Lug must be used in order to comply with
standards.
WARNING!
Before you connect a power supply to the NetGuardian, test the voltage of your power supply:
· Connect the black common lead of a voltmeter to the ground terminal of the battery, and connect the red
lead of the voltmeter to the battery's –48 VDC terminal. The voltmeter should read between –43 and –
53 VDC. If the reading is outside this range, test the power supply.
To connect the NetGuardian to a power supply, follow these steps:
1. Remove the fuse from the back panel of the NetGuardian. Do not reinsert the fuse until all
connections to the unit have been made.
2. Remove the power connector plug from Power Connector A. Note that the plug can be inserted into the
power connector only one way — this ensures that the barrier plug can only be reinserted with the
correct polarity. Note that the –48V terminal is on the left and the GND terminal is on the right.
3. Use the grounding lug to connect the unit to earth ground. The grounding lug is next to the
Insert the eyelet of the earth ground cable between the two bolts on the grounding lug (Ground cable not
included).
4. Insert a battery ground into the power connector plug's right terminal and tighten the screw; then
insert a –48 VDC line to the plug's left terminal and tighten its screw.
5. Push the power connector plug firmly back into the power connector. If the power feed is connected
Fig. 6.3.1. Power connectors and fuse.
Grounding Lug and Symbol
9
symbol.