DPS Telecom NetGuardian 832/864A User Manual page 14

10
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
WARNING!
Before you connect a power supply to the SiteDialer, 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 SiteDialer to a power supply, follow these steps:
1. Remove the fuse from the back panel of the SiteDialer. 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
symbol. 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.
7. Reinsert the fuse to power the SiteDialer. The front panel LEDs will flash RED and GREEN.
standards.
Fig. 5.2.1.2. Grounding Lug and Symbol