Unicont SPb PS-303, PS-303-A2-2, PS-303-A2-1, PS-303-A1-1, PS-303-22-1 Technical Documentation Manual
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Unicont SPb Ltd
Power supply unit
PS-303
Technical Documentation
(303-4-04022011)
St. Petersburg
2011
Unicont SPb Ltd Technical Documentation PS-303
Page 2
Table of Contents
1. GENERAL INFORMATION..........................................................................................3
2. DELIVERY SET...............................................................................................................3
3. TECHNICAL DATA........................................................................................................3
4. DESCRIPTION AND FUNCTIONALITY OF THE PS-303 PSU ..............................4
5. INSTALLATION AND CONNECTION........................................................................5
6. TRANSPORTATION AND STORAGE ......................................................................11
7. WARRANTY ..................................................................................................................12
8. DATE OF PACKING.....................................................................................................13
9. ACCEPTANCE DETAILS ............................................................................................13
10. DATE OF COMMISSIONING .....................................................................................13
Unicont SPb Ltd Technical Documentation PS-303
Page 3
1. General Information
The PS-303 power supply unit (PSU) is designed to supply stabilized 12 V or 24 V to
various shipboard and commercial consumers. A load transfer function is integrated into the
PSU, which ensures that in case of a failure in the main power supply it will switch over to an
external battery or to an emergency DC network.
2. Delivery Set
1. Power supply unit PS-303 1 piece
2. Operation manual 1 piece
3. Technical Data
There are different versions of the PS-303 power supply units, and input and output
voltage and current values for different PSU versions are shown in the electrical data table
(Table 1).
Input voltage
Load transfer
110/220 50 Hz, 24 V, 12 V, depending on the model (see
the electrical data table)
Automatic load transfer from input #1 to input #2 in case
of a voltage failure at input #1 (relay contacts)
Output voltage
24 V, 12 V DC (see the electrical data table)
Load rated current
Number of terminals for loads
Protection
4 to 27.5 A (see the electrical data table)
2 terminals
From a short circuit or another overload, (with fuses for the
main and backup networks)
Rated power: 50 to 350 W (see Table 1)
Efficiency
Indication
Dimensions
Gland type
Operating temperature
Storage temperature
Weight
Protection class
85 %
Green LED supplied from the main network (input #1) and
red LED supplied from the backup network (input #2)
499 х 710 х 169 mm
MG 16 (similar to PG 13.5)
-20 to +55 °C
-60 to +70 °C
4 kg
IP 22
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 (2х1.0) 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.
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