15
1SDH000759R0002, L4106
Installation and operating instructions, ATS021
Figure 4.4
Selecting the automatic transfer switch ATS021 to Automatic Mode
4. Operating
KA00496
0s
5
10
20
30
TEST
CB1
CB2
RESET
20
5
+
10
10
20
5
30
30
MAN.
%
AUTO
20
5
+
%
20
5
30
30
10
10
MAN.
AUT
O
4.2 Automatic transfer switch ATS021 in Automatic Mode
The automatic transfer switch ATS021 is selected to the Automatic Mode by the Lim rotary switch on the
front panel.
The operating mode and the voltage threshold are selected simultaneously by setting the Lim rotary
switch to the desired position. The available selections in Automatic Mode are: ± 5, ± 10, ± 20, ± 30 %.
For example, when the Lim rotary switch is set to “20 AUTO”, the device is in the Automatic Mode and
the voltage threshold is ±20 %. More information of the selection of voltage threshold, see pages 16 and
26.
4.3 Selection of delay time and voltage threshold
The delay time and the voltage threshold are set by the rotary switches in automatic transfer switch
ATS021.
Figure 4.5
Selection of delay time and voltage threshold in ATS021
Ts = Delay time for automatic switching
The delay time is the time before activating the switching sequence and the back-switching sequence.
Available selections for the delay time are: 0, 5, 10, 15, 20, 25, 30 s.