Power Connection - DPS Telecom NetGuardian-16S User Manual

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5.3

Power Connection

The NetGuardian-16S has two screw terminal barrier plug power connectors, located on the left side of the back
panel. (See Figure 5.3.1.)
Before you connect a power supply to the NetGuardian-16S, 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-16S to a power supply, follow these steps:
1. Remove the fuse from the back panel of the NetGuardian-16S. 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. 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.
4. 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 by the power connector will light RED.
5. Repeat Steps 2–4 for Power Connector B.
6. Reinsert the fuse to power the NetGuardian-16S. The front panel LEDs will flash RED and GREEN.
Fig. 5.3.1. Power connectors and fuse.