Automatic Switching Without Inverse Procedure - ABB ATS022 Installation And Operating Instructions Manual

4. Applications of device ATS022
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED
CB3 CLOSED
Figure 4.13: Application time diagram 3CBs BUS TIE – line LN2 failure

4.5 Automatic switching without inverse procedure

Description
Following an anomaly of the main line, ATS022 switches on an emergency line (1). If the mains supply
is restored, the inverse switching procedure is not started up (2). If there is a fault in the reserve line,
ATS022 must open the emergency switch (3) and wait for restoration of the emergency line to reclose (4),
without in any case providing for switching on the main line. This operating mode is also applicable if the
generator is present: in this case, after time Ts the generator is started up and as soon as the emergency
line is available CB1 is opened.
ATTENTION If ATS022 is not powered by the auxiliary supply and by any of the two lines the device
waits for at least one of the two lines (5) to return before proceeding with the switching procedure (6).
The option is not available in case of 3CBs Bus Tie application and in case of selection of the no priority
line option.
Time diagrams
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED
Figure 4.14: 2CBs application time diagram - generator not in use – without inverse switching procedure
1SDH000760R0002
TS TC
(1) (2)
TS TCE
Installation and operating instructions, ATS022
TBS
(3) (4)
TBS TCE
15
TCN
(5) (6)
TBS