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3.
Introduction
LN1
L1 L2 L3
N
1
2
X11
3
4
1
X13
2
LN2
L1 L2 L3
N
1
2
X12
3
4
1
X14
2
Figure 3.1:
Diagram showing ATS021 connection to lines LN1-LN2
3.2
Application scenarios
The ATS021 device may be used in the following applications:
• Main line – Emergency line switching
• Main line – Emergency generator switching
With the Lim rotary switch in the SETUP position, the RESET key can be used to set the following
switching logics:
• main line: Line LN1
• no line priority
• automatic mode without inverse procedure
Different combinations of LEDs indicate the setting of the various switching logics. For the details, see
Chap. 5.
1SDH000759R0002
LN1
L1 N
L1
L2
LN1
L3
N
L
N
LN2
L1 N
L1
L2
LN2
L3
N
L
N
Installation and operating instructions, ATS021
L1 L2
1
L1
2
X11
LN1
3
4
N
1
L
X13
2
N
L1 L2
1
L1
2
X12
LN2
3
4
N
1
L
X14
2
N
7
LN1
L3
1
L1
2
L2
X11
LN1
3
L3
4
1
L
X13
2
N
LN2
L3
L1
1
2
L2
X12
LN2
3
L3
4
1
L
X14
2
N
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