www.pulsar.pl POE044812B
GREEN POWER CCTV PoE
3
1. Technical description.
1.1. General description.
The PSU is designed for supply of up to 4 webcams requiring stabilized voltage of
48V DC(+/-15%)
. The PSU
supplies voltage of
54V DC
and total current capacity of:
I=4x0,25A+0,3A Battery charging*.
In case of mains power loss, the unit will instantly switch to battery operation.
The approximate backup time is given assuming that all output ports are used (using typical devices and 7Ah
batteries). The electricity consumption for own needs and the energy efficiency of the power intake track were taken into
account. The exact description of how to perform the calculations can be found at:
There are 4 power supply outputs, independently protected by melting fuses or PTC polymer fuses. Failure
(short circuit) in the output circuit will activate the melting fuse or PTC fuse and disconnect the circuit from DC power (+
U). Fuse failure is indicated by switching off the corresponding LEDs: L1 for AUX1, etc. In addition, the FPS output (hi-Z
state) and L
FPS
LED are activated and the relay contacts change their position. The PSU is housed in a metal enclosure
with signaling panel equipped with a microswitch indicating door opening (front cover). The power is carried over the
spare pairs (4/5
& 7/8), which, according to the Ethernet network standard, are not used for data transmission (data
transmission uses 1/2 and 3/6 data pairs).
The PSU can not be used in Gigabit Ethernet networks, where all twisted pairs are involved in the
transmission of data!
During normal operation, the total current drawn by the device should not exceed I = 4x0,25A.
Maximum battery charging current is 0,3A. Total current of the receivers + battery is max 1,2A
*
(72W).
1.2. Block diagram.
Fig. 1. Block diagram of the PSU.
1.3. The description of components and connectors of the PSU.
Table 1.
Component No.
[Fig. 2]
Description
[1], [10]
LED optical indication:
green L
IN
– indication of voltage at the
IN
input
red L
AC
–
AC
voltage indication
red L
FPS
–
FPS
failure indication
[2]
Connector:
IN
–
power supply of the module (factory setting)
AC
– 230V mains supply indication input
[3]
F1 ÷ F4
fuses in the AUX1
÷ AUX4 (+), F500mA circuits
[4]
Jumper to select melting fuse or PTC polymer fuse
*
See diagram 1
