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Operation
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Avaya
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RS9 UPS (9–18 kVA, 9-Slot Models) Site Preparation, Installation and Operator’s Manual
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164201543 Rev A
Off mode turns off the output and most internal circuitry. Within this
mode, another mode (Sleep) turns off all internal circuitry when AC line
is not present and battery voltage drops to a low threshold. If AC input
voltage is not present in Off mode, the user can direct the UPS to enter
Sleep mode by selecting the Battery Protect (BP) feature (see “Removing
Input Power” on page 33). When AC input voltage returns in the Off
mode (caused by a low battery alarm condition), the UPS automatically
recovers and, if the Auto Restart parameter is enabled, switches to
Double Conversion. Auto Restart is enabled as a factory-default.
After a discharge and subsequent low-battery shutdown, the UPS will
automatically recover from Sleep mode if the Auto Restart parameter is
enabled.
Figure 19 shows the basic functional elements of the UPS.
Input
(Utility)
Power
Input Power (Boost)
Converter
Internal DC
Power Bus
DC/AC Power Inverter
Output Relay
Bypass Relay
Capacitor Bank
Battery Charger
Battery
Modules
(Parallel)
Line/Battery
Relay
EMI/RFI
Filter
Figure 19. Avaya RS9 UPS Functional Block Diagram
Turning the UPS On
The unit has no physical On/Off switch. The UPS On/Off function must
be accessed through the front panel display.
If the UPS has been turned off, press the ON button through the front
panel display to turn the UPS on again.