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The backup sequence when power failure/voltage drop (instanta-
neous voltage drop) occures
Explains the backup sequence when a power failure occurs.
When the input power supply recovers while the battery level is sufficiently high
Input power supply
Battery restorage
Output from UPS
UPS
Normal operation
operating
Backup operation
mode
*1
BU signal (OUT)
BL signal (OUT)
*1
BS signal (IN)
*1
*1. For details, refer to 7-1 I/O signal functions on page 7-2.
When the input power supply recovers while the battery level is low
Input power supply
Battery restorage
Output from UPS
Normal operation
UPS
operating
Backup operation
mode
BU signal (OUT)
*1
*1
BL signal (OUT)
BS signal (IN)
*1
*1. For details, refer to 7-1 I/O signal functions on page 7-2.
When the input power supply does not recover until the battery becomes empty
Input power supply
Battery restorage
Output from UPS
UPS
Normal operation
operating
Backup operation
mode
BU signal (OUT)
*1
BL signal (OUT)
*1
BS signal (IN)
*1
*1. For details, refer to 7-1 I/O signal functions on page 7-2.
S8BA-series Uninterruptible Power Supply (UPS) User's Manual (U726)
ON
Durling power failure
OFF
High
Low
Empty
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Durling power failure
OFF
High
Low
Empty
ON
OFF
ON
OFF
ON
OFF
ON
OFF
ON
OFF
High
Low
Empty
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Durling power failure
4 Operations
4
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