Mounting; Power Connection - DPS Telecom DAC-P User Manual

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5.2

Mounting

The DAC-P can be mounted in a 19" rack or a 23" rack by using different 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 3.
5.3

Power Connection

To connect the DAC-P to a power source, follow these steps:
1. Remove the fuse from the front panel of the DAC-P and make sure that the power supply to the unit is off.
2. Remove the screw lug barrier plug from the front panel of the DAC-P.
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.
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 DAC-P. 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 DAC-P 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 DAC-P.
Fig. 3. The DAC-P can be flush or rear-mounted.