User Manual

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User Reference and Installation Manual 3-26

MDS 5800 II

3.7.3 Connecting the SDIDU

to the PC and Power Source

Perform the following steps to ensure the SDIDU

is powered up and connected to you PC:

1. To connect to the SDIDU

DC power connector (located on the left front SDIDU

panel), an

SDIDU

power cable is required. A mating power cable connector (Phoenix Contact P/N 17

86 83 1) is provided with the MDS 5800 II SDIDU

for construction of this cable. This

connector has screw clamp terminals that accommodate 24 AWG to 12 AWG wire. The

recommended wire size for construction of power cables under 10 feet in length, supplying

-48 V dc, is 18 AWG. The opposite end of the SDIDU

power cable should have a

termination appropriate for the power supply being used. The SDIDU

power cable should

be of sufficient length to avoid tension in the cable and provide a service loop for connection,

but not be of excessive length. Stranded wire should be used over a solid conductor to

reduce tension on the SDIDU

DC Power connector. Using the supplied power cable

connector, pin 2 (labeled -V) should be connected to the power supply terminal supplying -48

V dc, while pin 1 (labeled RET) should be connected to the power supply return. Refer to

Figure 3-14. Note that pin 1 (RET) of the SDIDU

DC Power connector is connected to the

SDIDU

chassis ground internal to the SDIDU

. Use of a power supply with an

inappropriate ground reference may cause damage to the SDIDU

and/or the supply.

2. Connect the SDIDU

power cable to the -48 V dc power supply, and place the voltmeter

probes on the unconnected SDIDU

end of the power cable, with the positive voltmeter

probe on pin 2 (-V) of the cable connector and the negative probe on pin 1(RET). The

connector screw terminal screw heads may be used as convenient monitor points. Refer to

Figure 3-14.

3. Turn on the –48 V dc supply. Verify that the digital voltmeter reads between -44 V dc and -52

V dc when monitoring the cable points specified above. Adjust the power supply output

voltage and/or change the connections at the power supply to achieve this reading.

4. With the negative voltmeter probe still on pin 1 (RET) of the power cable connector (and the

power supply still on), press the positive voltmeter probe to the SDIDU

chassis and verify a

potential of zero volts between the SDIDU

chassis and cable pin 1 (RET). If the measured

potential is not zero, the power supply may be grounded incorrectly and should not be used in

this condition with an SDIDU

. Note that this measurement assumes that the SDIDU

installed and properly grounded. If this is not the case, the same measurement can be made

between cable pin 1 (RET) and a convenient ground (such as an ac outlet third-wire ground).

5. Turn the -48 V dc supply off.

6. Plug the SDIDU

power cable into the SDIDU

front panel DC Power connector (DC

Input). Place the voltmeter probes on the cable connector screw terminal screw heads as

per step 2 above. Refer to Figure 3-5. Note that the MDS 5800 II SDIDU

does not have a

power on/off switch. When DC power is connected, the digital radio powers up and is

operational. There can be up to 320 mW of RF power present at the antenna port. The

antenna should be directed safely when power is applied.

7. Turn on the -48 V dc power supply, and verify that the reading on the digital voltmeter is as

specified in step 3 above.

8. Turn the -48 V dc supply off.