User Manual

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User Reference and Installation Manual 3-23

MDS 5800 II

3.6.4.2 Grounding the SDIDU

1. Remove the nut and ring lug terminal from the SDIDU

optional Chassis GND stud (located

on the front panel).

2. The provided ring lug crimp terminal is intended to be used with 18 AWG wire (provided by

the customer). The SDIDU

should be able to be connected to a system or building

electrical ground point (rack ground or power third-wire ground) with a cable of 36” or less.

3. Crimp the ring lug terminal to one end of the wire to be used as the SDIDU

ground wire.

Connect the opposite end of the SDIDU

ground wire to the local source of ground in an

appropriate manner.

4. Place the ring lug of the SDIDU

ground cable on the SDIDU

Chassis GND stud.

5. Place the nut on the SDIDU

Chassis GND stud and tighten appropriately.

3.6.5 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 3-5. 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 3-5.

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