Redundant Switch - Applications Guide March 22, 1999
16
Redundant Switch Function Settings
Change the factory preset settings as shown in bold.
Function Setting Description
Source Preference Source A The Redundant Switch delivers power to the loads through input
power connected to Source A. The Switch will switch to selecting
Source B if it detects that Source A can not supply power to the load.
The Switch will use Source B until it detects that Source A has
regained its ability to supply power to the load . At this point, the
Switch will switch back to selecting Source A.
Source A
Sensitivity and
Source B
Sensitivity
Normal
The Redundant Switch delivers power to the Smart-UPS through the
input power connected to a source (A or B). When the Redundant
Switch switches sources, the Smart-UPS unit the momentary
interruption of input power and will switch to On Battery. When the
new power source delivers power to the Smart-UPS, the Smart-UPS
will switch revert back to On Line. The load is not effected by the
Smart-UPS switching momentarily to On Battery.
Source A transfer
voltage and Source
B transfer voltage
Normal This setting keeps the Redundant Switch from switching sources
through normal voltage variations. Consult the Redundant Switch
User’s Manual for other Transfer Voltage settings. The Smart-UPS
units use Boost / Trim / and On Battery control techniques to regulate
output voltage to the load.
Smart-UPS Settings:
Follow the information given in the Smart-UPS User’s Manual to select the correct Smart-UPS
configuration for the power environment.
Installation
Smart-UPS unit: Follow the instructions and procedure given in the Smart-UPS User’s Manual or Smart-
UPS Rack Mount Supplement.
Redundant Switch: The Redundant Switch mounts in the front or the rear of a standard 19” cabinet,
occupying 1U of rack space.
Follow the Redundant Switch User’s Manual Initial Start-Up instructions.
Operation
Redundant Switch acts as a static transfer switch in this application. If Redundant Switch detects that the
source it has selected no longer has the ability to power the load it proactively engages the redundant AC
circuit and sources power to the Smart-UPS through this circuit.
The Smart-UPS unit provides power protection and safe server shutdown to the load.
Specifications
The Smart-UPS unit protects the load in this application. This means that the transfer time that the load
experiences will be the transfer time of the Smart-UPS unit, and not the transfer time of Redundant Switch.
The load experiences a transfer time of 2ms typical / 4 ms maximum. For complete specifications, refer to
the specifications for the Smart-UPS unit in your application (check our website: http://www.apcc.com)
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