User`s guide

42 007-4522-003
2: Connecting to a Host and Powering On and Off
Checking Grounding for the Rack
If necessary, follow these steps to ensure that a safe grounding system is provided:
1. Note the information in “Grounding Issues” on page 37.
2. For the grounding check, ensure that the rack PDU power cords are not plugged in
to a power source.
Caution: Some electrical circuits could be damaged if external signal cables or
power control cables are present during the grounding checks.
3. Ensure that each power supply/cooling module of each enclosure in the rack is
cabled to a PDU on the appropriate side of the rack.
4. Check for continuity between the earth pin of the enclosure power cords and any
exposed metal surface of the enclosures in the rack.
5. Check the earth connection of the power source.
Warning: The rack PDUs must be connected only to power sources that have a safe
electrical earth connection. For safety reasons, this earth connection must be in place
at all times.
Powering On the Rack
When the rack is set up, it is usually powered on and ready to be operated. If it has been
turned off, follow these steps to power it back on:
1. Ensure that the ambient temperature is within the specified operating range of 10
°C
to 40
°C (50 °F to 104 °F). If drives have been recently installed, make sure that they
have had time to acclimatize before operating them.
2. Ensure that each power supply/cooling module of each enclosure in the rack is
cabled to a PDU on the appropriate side of the rack.
3. If they have not already been connected, connect each PDU power cord to a power
source. The PDU power cords can be routed through an opening at the top or the
bottom of the rack. See Figure 2-3 on page 41.
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