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MSC1512
5
As the PSU module is designed for a continuous operation and is not equipped with a power-switch,
therefore an appropriate overload protection shall be guaranteed in the power supply circuit. Moreover, the user
shall be informed about the method of unplugging (most frequently through separating and assigning an
appropriate fuse in the fuse-box). The electrical system shall follow valid standards and regulations.
The PSU module requires AC or DC power supply with galvanic insolation (II insolation class), short-circuit
and overload protections. The power of the source can be calculated with the following formula:
S=1,3 x ( P
AUX
+ P
HEATER
) for AC power supply
P=1,3 x ( P
AUX
+ P
HEATER
) for DC power supply
where:
S
= minimum power of supplying transformer [VA]
P
= minimum power of DC power supply unit [W]
P
AUX
= power of the receiver (receivers) connected to the AUX output (max.)
In order to meet the LVD and EMC requirements, the rules concerning: supply, development and shielding
ought to be followed- accordingly to the application.
Typical application MSC1512 (fig.2, fig.3).
Fig.3. Connection of the PSU module and a 12VDC camera in an external enclosure.
EXAMPLE:
- 27V/AC power supply (e.g. PSAC 04244 PSU, the output switched to U2)
- total current consumption 1,9A of AC power (by the MSC1512 module, load current: 1,5A@12V)
- L= 120m wire 2x 0,5mm2 (R= ~3
Ω
x2@100m)
- the voltage at the module’s terminals equals 16V/AC
- maximum power to use S= 16V*1,9A=30,4VA
- full power use MSC1512: 18W@12V/DC
2.2. Installation in a CCTV camera enclosure
1. Mount the PSU module (on the wall or inside the intended device) and lay the wires through the cable ducts.
2. Lay on the output voltage from AC transformer or DC power supply unit to the ~AC~ terminals.
3. Configure the J-Uout jumper according to the requirements of the device and the supply voltage.
4. Connect the receivers’ cables to the +AUX, -AUX terminals of the terminal strip, on the module’s pcb.
5. Switch on the AC power (the AC red diode and the AUX diode should be permanently illuminated).
6. Check the output voltage (the module’s voltage without load should amount to12V or24V).
7. Once the tests and operation control have been completed, the enclosure can be locked.
