Unicont SPb Ltd
Technical Documentation PS-303
Page
4
Table 1 Electrical data of different versions of the PS-303
Galvanic isolation /
stabilization of
input #1 and #2)
Connection
diagrams
(Fig. 3)
Version
Main
supply,
input #1
Backup
supply,
input #2
(V)
Output
voltage,
(V), DC
Output
current,
(A)
Input #1 Input #2
1
PS-303-A2-2
24
4.2
+
+
Figure 4
2
PS-303-A2-2
24 6.5
+
-
Figure
4
3
PS-303-A2-2
24
12.5
+
-
Figure 4
4
PS-303-A2-1
24
12 8.5
+
+
Figure
8
5
PS-303-A1-1
12
12.5
+
-
Figure 5
6
PS-303-A1-1
220 V
50/60 Hz
12
12 25
+
-
Figure
5
7
PS-303-22-1
12
8.5
+
+
Figure 10
8
PS-303-22-2
24 4.2
+
+
Figure
6
9
PS-303-22-2
24
24
14.6
+
-
Figure 6
10
PS-303-21-1
12 27.5
+
-
Figure
7
11
PS-303-21-1
24 V
12
12.5
+
-
Figure 7
12
PS-303-11-1
12 V
12
12 4.1
-
-
Figure
9
It is advisable to use the KMPVe (2
х
1.0) cable or an equivalent to connect to the
PS-303 input and output.
4.
Description and Functionality of the PS-303 PSU
The PS-303 has two inputs, i.e. input #1 for the main network and input #2 for the
backup one, two terminals for the loads, and light emitting diodes indicating power supply from
the main network or from the backup one (see Figure 1).
Voltage from input #1 comes to the voltage conversion and stabilization module, and
then the stabilized voltage goes to the load output via the contacts of the relay having responded
to that voltage.
Voltage from input #2 comes to the voltage conversion and stabilization module; in
some versions such a module is not available (Table 1). The stabilized voltage (or input #2
voltage) is supplied to the contact of the relay switching the supply networks and stays there in
such condition until the relay responds to it. If voltage in the main network fails, the relay
responds (trips), and the converted backup circuit (input #2) starts feeding the load.
The network connected to input #1 is considered the main power supply of the PS-303,
and the network connected to input #2 is considered the backup one.
The LEDs indicate which power supply input network is currently used by the load.