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OPERATION
Eaton 9170
+
UPS (3–18 kVA) User's Guide S 164201393 Rev E www.eaton.com/powerquality
78
Off mode turns off the output and most internal circuitry. Within this
mode, Sleep mode 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 79). 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 mode. Auto Restart is enabled as a factory-default.
After a discharge and subsequent low-battery shutdown, the UPS
automatically recovers from Sleep mode if the Auto Restart parameter is
enabled.
Figure 53 shows the basic functional elements of the UPS.
Isolation
Transformer
(an option only
provided
on units
manufactured
before 2009)
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
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Figure 53. Eaton 9170+ UPS Functional Block Diagram