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Installation and operating instructions, ATS021
3. Description
3.1 Application scenarios
ATS021 is connected to two incoming power lines; two scenarios are available:
Both lines are the secondary section of a medium-low voltage transformer (network a - network b).
Line 2 is used in an emergency case.
One normal line and an emergency generator line.
ATS021 monitors both power lines continuously and analyzes:
frequency (0.9fn > f > 1.1fn)
voltage
phase balance (set by Lim parameter)
If the difference between the rated voltage and the measured voltage is greater than the threshold value
set by parameter Lim, the line is considered to have an anomaly. The same threshold value applies to the
difference between the highest and the lowest phase voltage. An invalid frequency (0.9fn > f > 1.1fn) also
causes an anomaly.
3.1.1 Automatic functions
If an anomaly occurs on line 1, ATS021 will perform the switching sequence:
1.
Delay TS (set by rotary switch Ts: 0, 5, 10, 15, 20, 25, 30 seconds)
2.
Start the generator
3.
When line 2 voltage is ON and no anomalies occur, send an opening command to CB1. If CB1 is still
closed after 5 seconds, the alarm "Open 1 Failure" is activated. The alarm is indicated by a blinking
Alarm LED, and the CB1 LED will stay ON. The alarm is cleared and logic restarted by pressing the
RESET button.
4.
Fixed delay TF (3.5 seconds)
5.
Send a closing command to CB2. If CB2 is still open after 5 seconds, alarm "Close 2 Failure" is
activated. A blinking Alarm and CB2 LEDs indicates alarm. The alarm is cleared and logic is
restartedby pressing the RESET button.
If CB1 is initially open, the switching sequence is started directly from step 4.
If line 1 voltage comes back without any anomalies, a back-switching sequence will be performed:
1.
Delay TS
2.
Send an opening command to CB2. If CB2 is still closed after 5 seconds, the alarm "Open 2 Failure"
is activated. A blinking Alarm LED indicates an alarm and the CB2 LED will stay on. The alarm is
cleared and logic restarted by pressing the RESET button.
3.
Fixed delay TF
4.
Send a closing command to CB1. If CB1 is still open after 5 seconds, "Close 1 Failure" is activated.
A blinking alarm and CB1 LEDs indicate an alarm. The alarm is cleared and logic restarted by
pressing the RESET button.
5.
Delay TGOFF (5, 10, 15, 20, 25, 30 seconds or 5 minutes)
6.
Stop the generator
If CB2 is initially open, a back-switching sequence is started directly from step 4.
10
1SDH000759R0002, L4106
3 Description
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