Pulsar RN25024 User manual

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RN-2,5A/24V
RN25024
v.1.0
DC Voltage reducing unit
EN
Issue: 1 dated 04.05.2011.
Supersedes issue: ----------
1. Tec nical description.
1.1. Overview.
The RN-2,5A/24V (RN25024) voltage reducer is dedicated for lowering and stabilization of the C voltage within
the range 24V÷28V to the value of 24V (22,0V÷Uin). The reducer reduces the voltage higher than set (24V), and below
the threshold, it conducts without loss (voltage drop ∆U<1%). This allows the entire use of the energy accumulated in the
battery of the power supply unit if the unit is battery operated.
The RN25024 reducer, in combination with the typical buffer PSU, is dedicated for supplying the equipment
requiring stabilized voltages within the range 20,0V÷24,0 V C. In particular, it is designed for CCTV systems (movie
cameras, IR illumination units), access control systems and other low-voltage systems where the equipment supplied with
voltage 24V C (-10%/+5%) is found and this cannot be directly supplied from the 27,6 V C output of the buffer PSU.
The maximum current load of the reducer is equal to 2,5A (consumer capacity P= 60W max.). The output of the
RN25024 reducer is equipped with the overload protection (OLP). The reducer is equipped with the optical indication of
operation providing the information about the C supply and C output statuses. The module is not equipped with the
galvanic insulation between the input/output (IN-AUX), and operates on the common ground potential (0V) (the IN- and
AUX- terminals are connected together in a galvanic way = shared terminal).
1.2. Block diagram (fig.1).
Fig 1. Block diagram of the voltage reducer.

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1.3. RN25024 typical application (fig.2).
Fig.2. RN25024 voltage reducer typical application.
1.4. T e description of elements and reducer connection link (fig.3, tab.1, tab.2).
Table 1.
No.
[fig.3] Description of t e element
[1] IN LED diode – red (reducer supply status)
[2] +IN-, +AUX-, connection links of t e voltage reducer (see tab.2)
[3] AUX LED diode – green (reducer output status)
[4] P1 potentiometer, voltage adjustment (22,0÷Uin V)
Table 2.
[2] Description of module connection links
+IN
- IN
C supply input (+IN= +U, -IN=GN , 0V), 18V÷28V C, stabilized, see the selection
of supply source power
+AUX
- AUX C supply output C (+AUX= +U, -AUX=GN ), voltage U<24,0V C
Fig.3. View of the RN25024 voltage reducer.

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1.5. Tec nical parameters:
- electrical parameters (tab.3)
- mec anical parameters (tab.4)
Table 3.
Supply voltage 18V÷28V/ C (-/+5%)
Output voltage < 24,0V C nom. (+/- 0,6V)
Output voltage setting range 22,0V÷Uin V
Consumer capacity 60W max.
Output current 2,5A max.
Power consumption by module systems 9mA max.
Protection from s ort-circuit (SCP) and
overload (OLP)
110% ÷ 150% of the module power - limitation of
current through the PTC automatic fuse, manual
restart: disconnection of the C output circuit for 1
min.
Optical indication
- IN diode indicating t e DC supply status
- AUX diode indicating t e DC supply status at
t e output of t e power module
- red, normal status, permanently illuminated
- green, normal status, permanently illuminated
Operating conditions
II-nd environmental class, -10°C ÷40°C, the flow of air
around the module should be ensured to allow the
convection cooling
Table 4.
Dimensions 62 x 42 x 67 (WxHx )
Mounting Mounting bolts x 4 (PCB fi=4,2 mm)
Connection links Ф0,41÷1,63 (AWG 26-14)
Net/gross weig t 0,1kg/0,14kg
2. Installation.
2.1. Requirements.
The voltage reducer module is dedicated for installation by the qualified electrician, holding relevant permits and
licenses (applicable and required for the specific country) for connecting (interference with) the LV systems. The unit
should be mounted in the non-open premises, in accordance with the II-nd environmental class, with the normal relative
humidity (RH=30%-90% maximum, without condensing) and temperature within the range -10°C to +40°C. The module
should be operated in the position ensuring that the air may freely flow around the module in a convectional way.
Prior to entering for t e installation, t e balance of module load s ould be drawn up. Pending t e normal
operation, t e sum of currents consumed by t e consumers may not exceed I=2,5A (Pmax=60W). In order for t e
module to operate properly, t e adequate current capacity of t e supply source s ould be ensured. T e supply
source (power pack) must be equipped wit its own SCP s ort-circuit protection and OLP overload protection.
The unit should be installed in the metallic enclosure (cabinet, equipment) and, in order to meet the requirements
of LV and EC, the following rules should be observed: supply, development, shielding - accordingly to the application.
2.2. Installation procedure.
1. Install the enclosure, power pack (cabinet, etc.) and insert the cabling through the cable passes.
2. Install the RN25024 voltage reducer on the assembly bolts (the bolts should be installed prior to the operation of
enclosure or cabinet assembling).
3. eliver the C supply voltage to +IN, -IN, terminals observing the proper polarity.
4. Connect the conductors of consumers to the +AUX, -AUX terminals, observing the proper polarity.
5. Activate the C supply (the IN red diode should be permanently illuminated, AUX diode should be permanently
illuminated).
6. Check the output voltage (the nominal voltage of the module should be equal to 24,0 V). If the value of the maximum
voltage requires adjustments, the setting should be made by means of the potentiometer P1, monitoring the voltage at the
AUX output of the reducer.
7. Once the tests and control operation have been completed, lock the enclosure, power pack, cabinet, etc.

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3. Indication of t e voltage reducer module operation.
3.1. Optical indication.
The voltage reducer is equipped with two LE diodes indicating the operation status: IN, AUX.
• IN- red diode: in the normal status ( C supply) the diode is permanently illuminated. The absence of C supply
is indicated by the IN diode going off.
• AUX- green diode: indicates the C supply status at the output of the module. Under normal status, the diode is
permanently illuminated and in the case of short-circuit or overload, the diode goes off.
4. Handling and operation.
4.1. Reducer output overloads.
In the case of short-circuit or overload of the AUX output, the output voltage is disconnected automatically and
this is indicated by the AUX diode going off. In such a case, the load from the voltage reducer output should be
disconnected for the period of about one minute.
4.2. Maintenance.
The voltage reducer does not require performing any specific maintenance measures, however, in the case of
significant dust rate, its interior should be cleaned with compressed air.
WEEE MARK
T e waste electric and electronic products do not mix wit general ouse old
waste. T ere are separate collection system for used electric and electronic
products in accordance wit legislation under t e WEEE Directive and is
effective only wit EU.
GENERAL WARRANTY CONDITIONS
1. Pulsar K. Bogusz Sp.j. (manufacturer) grants a two-year quality warranty for the equipment starting from the date of
purchase placed on the purchase order.
2. Should such purchase order be missing when the claim is submitted the three-year guarantee period is counted from the
date of the manufacturing of the device.
3. The warranty includes free-of-charge repairing or replacing with a functional equivalent (the selection is made by the
manufacturer) of the malfunctioning device due to reasons attributable to the manufacturer including manufacturing and
material defects unless such defects have been reported beyond the warranty period (item 1 and 2).
4. The equipment subject to warranty is to be brought to the place where it was purchased or directly to the main office of
the manufacturer.
5. The warranty applies to complete equipment including the type of defect specified in writing using a properly filled
warranty claim.
6. Should the claim be accepted the manufacturer is obliged to render warranty repairs as soon as possible however not
later that within 14 days from the delivering of the equipment to the service centre of the manufacturer.
7. The repair period mentioned in item 5 may be prolonged if there is no technical capability to carry out the repairs and in
the case that the equipment has been accepted conditionally due to the failing of the warranty terms by the claimant.
8. All the services rendered by force of the warranty are carried out at the service centre of the manufacturer exclusively.
9. The warranty does not cover the defects of the equipment resulting from:
- reasons beyond the manufacturer's control
- mechanical damage
- improper storage and transport
- use that violates the operation manual or equipment application
- random events including lightning discharges failures of power networks fire flooding high temperatures and chemical
agents
- improper installation and configuration (at variance with the rules set forth in the manual)
10. Each confirmation of structural modifications or repairs carried out beyond the service centre of the manufacturer or any
modification of serial numbers or warranty labels results in the loss of the rights resulting from the warranty.
11. The liability of the manufacturer towards the buyer is limited to the value of the equipment determined according to the
wholesale prices suggested by the manufacturer on the day of purchase.
12. The manufacturer shall not be responsible for the defects that resulted from the damaging malfunctioning or inability to
operate the equipment particularly if such defects are the result of failing to abide by the recommendations and
requirements contained in the manual or the use of the equipment.
Pulsar K.Bogusz Sp.j.
Siedlec 150,
32-744 Łapczyca, Poland
Tel. [phone], Fax. [phone]
e-mail: [email protected], sale[email protected]
http:// www.pulsar.pl