13
1SDH000759R0002, L4106
Installation and operating instructions, ATS021
4. Operating
Before using of the Automatic transfer switch ATS021, read carefully chapter 1 “Safety notes” in order to
avoid malfunctions or dangerous operating conditions.
4.1 Automatic transfer switch ATS021 in Manual Mode
The automatic transfer switch ATS021 is selected to the Manual 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 Manual Mode are: ± 5, ± 10, ± 20, ± 30 %.
For example, when the Lim rotary switch is set to “20 MAN.”, the device is in the Manual Mode and the
voltage threshold is ±20 %. More information of the selection of voltage threshold, see pages 15 and 26.
Figure 4.1
Selecting the automatic transfer switch ATS021 to Manual Mode
4. Operating
Never open any covers on the product. There may be dangerous external control
voltages inside the ATS_ automatic transfer switch even if the voltage is turned off.
Never handle control cables when the voltage of the ATS_ automatic transfer switch or
external control circuits are connected.
Exercise suf
fi
cient caution when handling the unit.
KA00495
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
To select the operating line by the automatic transfer switch ATS021 in Manual Mode:
a.
Push the appropriate CB1 or CB2 key
b.
When pushing the CB1 key (see the Figure 4.2/
j
), the circuit breaker CB1 will be in the ON position
(the status and the line indication, see the Figure 4.2/
k
) and the circuit breaker CB2 will be in the
OFF position. When the circuit breaker CB1 is already in the ON position, the CB1 led is ON (see the
Figure 4.2). During switching the CB1 led blinks 50% ON and 50% OFF. If the circuit breaker CB1 is
already in the ON position, pushing the CB1 key opens the circuit breaker.