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2. Multiply the numbers together to get Volt-Amperes (VA):
VA = Volts x Amperes
3. Add the VA from all the pieces of equipment together to find the total VA
requirement.
To determine the minimum volt-amperage requirements for your UPS, add 30% to
the total.
Provide a Suitable UPS Transition Time
UPS transition time is the time required for the UPS to change from providing AC
power derived from the utility (or mains) supply to providing AC power derived from
the battery backup. UPS transition time is sometimes called
UPS transition times vary between UPS models and implementations, but shorter
transition times are preferred. For stacking products, a UPS transition time of
20 milliseconds or less ensures optimum performance and minimizes service
interruptions.
For high-availability and fault-tolerant installations in which the switches use
redundant power supply units (PSUs), ensure that each PSU in a switch is connected
to a different UPS and that each UPS is powered by an independent AC supply. This
will prevent service interruptions when a power source is lost, or when a UPS unit
fails. (Note that a single, appropriately sized UPS can power PSUs in multiple switches.
The recommendation is simply that for any given switch, the two PSUs should be
connected to different UPS units.)
Follow Applicable Industry Standards
Always follow applicable industry standards.
For more information, see the following ANSI/TIA/EIA standards:
•
ANSI/TIA/EIA-568-A—the six subsystems of a structured cabling system
•
ANSI/TIA/EIA-569-A—design considerations
•
ANSI/TIA/EIA-606—cabling system administration
•
ANSI/TIA/EIA-607—commercial building grounding and bonding requirements
You can access these standards at:
www.ansi.org
ISW Series Managed Industrial Ethernet Switch Hardware Installation Guide
Follow Applicable Industry Standards
UPS transfer time .
or www.tiaonline.org.
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