Eaton Powerware 9170+ UPS 3–18 kVA User Manual page 84

Powerware series 3–18 kva
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OPERATION
Input
(utility)
Line/Battery
Power
Relay
EMI/RFI
Filter
Battery
Modules
(parallel)
78
+
Eaton 9170
UPS (3–18 kVA) User's Guide
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.
Bypass Relay
Input Power (boost)
Converter
Battery Charger
Figure 53. Eaton 9170+ UPS Functional Block Diagram
S
164201393 Rev E www.eaton.com/powerquality
DC/AC Power Inverter
Internal DC
Power Bus
Capacitor Bank
Isolation
Transformer
(an option only
provided
on units
manufactured
before 2009)
Output Relay

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