ABB TruONE ATS Installation And Operating Instruction page 27

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
2.5.1.3 No source Priority (Generator
and load shed usage disabled)
Switching to available source:
• An anomaly occurs on the source 1
• Override momentary S1 outage delay
• Transfer from S1 to S2 delay
• Pre-transfer signal on
• Pre-transfer S1 to S2 delay
• Transfer switch to the position O (only
with delayed transition I-O-II type and
at least one phase exists in source 1)
• Center-Off delay (only with delayed
transition I-O-II type, delay is zero when
all phases are missing in source 1)
• Transfer switch to the position II
(source 2)
• Post-transfer S1 to S2 delay
• Pre-transfer signal off
Retransfer steps following anomaly in the
source functioning:
• The source 1 is restored
• An anomaly occurs on the source 2
• Transfer from S2 to S1 delay
• Pre-transfer signal on
• Pre-transfer S2 to S1 delay
• Transfer switch to the position O (only
with delayed transition I-O-II type and
at least one phase exists in source 2)
• Center-Off delay (only with delayed
transition I-O-II type, delay is zero when
all phases are missing in source 2)
• Transfer switch to the position I
(source 1)
• Post-transfer S2 to S1 delay
• Pre-transfer signal off
27