Dell IP4700 Service Guide - Page 99

The SPS begins charging the moment you connect it to ac power., on 1 position.

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The Standby Power Supply (SPS) 4 13. Attach interface cables between the storage processor and SPS ports, as follows. Fan packs are omitted for clarity. Refer to Figure 4-9. SP B COM2 COM2 SP A EMC1483 Figure 4-9 Connecting the SPSs and Storage Processors 14. Make sure the power switch for each SPS (see Figure 4-1) is in the on (1) position. The SPS begins charging the moment you connect it to ac power. The amount of time needed to charge it depends on the time spent in storage and the previous depth of discharge, as explained in Appendix A. Write caching cannot occur with an IP4700 unless at least one SPS connected to it is fully charged. Installing an SPS in a Rackmount Tray 4-11

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4
Installing an SPS in a Rackmount Tray
4-11
The Standby Power Supply (SPS)
13.
Attach interface cables between the storage processor and SPS
ports, as follows. Fan packs are omitted for clarity. Refer to
Figure 4-9.
Figure 4-9
Connecting the SPSs and Storage Processors
14.
Make sure the power switch for each SPS (see Figure 4-1) is in the
on (1) position.
The SPS begins charging the moment you connect it to ac power.
The amount of time needed to charge it depends on the time
spent in storage and the previous depth of discharge, as
explained in Appendix A. Write caching cannot occur with an
IP4700 unless at least one SPS connected to it is fully charged.
EMC1483
COM2
COM2
SP B
SP A