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EMC Symmetrix DMX-3 Product Guide
Planning and Installation
Choosing a UPS
The Symmetrix system is capable of supporting two consecutive
five-minute power outages before its BBU modules are depleted.
If you need to extend this time period, you will need to purchase a
UPS from a qualified vendor.
EMC neither offers nor recommends any specific UPS suppliers or
product type for its customers. This said, EMC uses preferred
suppliers for UPS systems in their facilities. Therefore, if you, the
customer, are implementing a UPS, EMC recommends the following:
◆ When you are planning the UPS solution for the Symmetrix
system and the host system is presently (or is going to be)
protected with a UPS, the battery backup time you propose for
the Symmetrix UPS solution should match that of the host
system.
◆ The Symmetrix system requires independent Zone B and Zone A
power feeds.
◆ The UPS should be equipped with an internal output isolation
transformer.
◆ The UPS should be installed as a separately derived AC source
using neutral and ground wiring to preserve the 2N fault
tolerance specification of the Symmetrix power system.
◆ EMC provides kVA power consumption specifications for each
system model as described in “Power and cooling data” on
page 269. Refer to these specifications when choosing a UPS.
Depending on the power requirements for your Symmetrix system
operation, an isolation transformer/stabilizer installed in front of the
UPS could further buffer the AC utility environmental factors from
reaching the Symmetrix system. To determine if an isolation
transformer/stabilizer is needed, consult a licensed electrician and
your EMC Customer Engineer.
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