ABB TruONE ATS Installation And Operating Instruction page 39

3 4 O X _ 3 0 - 1 6 0 0 r e v. B / 1 S C C 3 0 3 0 1 1 M 0 2 0 1
4 Manual retransfer:
On: Manual retransfer to priority
source enabled (automatic retransfer
disabled)
Off: Manual retransfer to priority
source disabled (automatic retransfer
enabled)
5 Dropout rU / rF:
Dropout voltage/frequency limit.
For example 5 % / 5 %:
Voltage source is considered
acceptable when measured voltage is
in range 0.95 * Un ... 1.05 * Un and
measured frequency is in range
0.95 * fn ... 1.05 * fn.
6 S1 Failure delay: The time
(0/1/2/3/4/5/10/15/20/30 s) device
waits after priority source failure
before starting automatic transfer
sequence from priority source to
non-priority source.
7 S1 Return delay: The time
(0/1/2/3/4/5/10/15/20/30 min)
device waits after priority source
return before starting automatic
retransfer sequence from non-
priority source to priority source.
8 Generator stop delay: The time
(30 s or 4 min) device waits after
transferring back to priority source
before stopping the generator.
9 Center-Off delay: The time (0 s or 4 s)
device waits in O position during
automatic transfer sequence I -> II or
II -> I (only delayed transition I-O-II
type). This delay is always 0 s in case
all phases are missing in the original
source.
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