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4.
Applications of device ATS021
4.3 Automatic switching without inverse procedure
Description
Following an anomaly of the main line, ATS021 switches to 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, ATS021 must open the emergency switch (3) and wait for the
emergency line to return 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 ATS021 is not powered 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).
Time diagrams
Line 1 ok
CB1 CLOSED
Line 2 ok
CB2 CLOSED
Figure 4.5:
Line-line application time diagram without inverse switching procedure
4.4
Line Priority Selection
Description
ATS021 makes it possible to handle the priority of the lines; the following selections are possible:
• main line: Line LN1
• no line priority: ATS021 ensure power to the load from one of the lines considering anyone of them as
priority line. So, for example, after the switch to LN2 because of LN1 falls, ATS021 stay on LN2 even
if LN1 came back. It is possible to select this mode by means of the RESET key with the Lim rotary
switch in the SETUP position. For more the details, see Chap. 5.
1SDH000759R0002
(1)
(2)
TS
TF
Installation and operating instructions, ATS021
(3)
(4)
TBS
TF
11
(5)
(6)
TBS
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