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Checking the grounding of the 2104 Model DS4
Perform the following steps to check the grounding of the 2104 Model DS4:
Figure 7. Power cables and SCSI connectors on the 2104 Model DS4
1. Ensure that all power is removed from the rack. See the installation document
for the rack or host system.
2. Ensure that the power cables 2 are plugged into each fan-and-power-supply
assembly. See Figure 7. Also ensure that the other ends of the power cables
are unplugged from the power distribution unit or battery-backup unit in the
rack. See the installation document for the rack or host system.
3. Attention: Some electrical circuits could be damaged if the external SCSI
cables are connected to the 2104 Model DS4 while the grounding check is
being done.
Ensure that no external SCSI cables are plugged at the connectors 1 .
4. Check the grounding of the 2104 Model DS4:
a. At the connector ends of the power plugs that you unplugged from the
power distribution unit or battery-backup unit in step 2, do a visual
inspection and ensure that the third wire ground pin is in good condition.
b. Use an ohm meter to connect one lead to the 2104 Model DS4 chassis
and the other lead to the third wire ground pin at the face of the power
connectors that you unplugged in step 2. You should read 0.1 ohm or less
between the ground pin on the power connector and the 2104 Model DS4
chassis.
SC000210
Safety and environmental notices
xv
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