Power Connection - DPS Telecom NetGuardian 420 DNP3 Hardware User Manual

The NetGuardian mounts in a 19" rack or a 23" rack using the provided rack ears for each size. Two rack ear
locations are provided. Attach the appropriate rack ears in the flush-mount or rear-mount locations shown in
Figure 6.2.1.
Note: Rack ears can be rotated 90° for wall mounting or 180º for other mounting options (not shown).

Power Connection

5.3
The NetGuardian has two screw terminal barrier plug power connectors, located on the left side of the back panel.
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.
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
correctly, the LED by the connector will light GREEN. If the polarity of the power feed is reversed, the
LED will not illuminate.
6. Repeat Steps 2–4 for Power Connector B.
The NetGuardian can be flush or rear-mounted
Power connectors and fuses.
7
symbol.