Premium FBS-460 Serie Manual De Instrucciones página 4

SERIE FBS-460
DESCRIPTION
The FBS-460 series consists of 3 switched-mode power supply unit models available in box format
which delivers an output of 460W.
The circuit comprises a line noise filter which reduces any conducted noise generated by the switching
of the power supply unit itself, to acceptable levels, followed by a full-wave rectifier (connected to
220V), which acts as a voltage doubler when connected to 110V. The DC voltage thus obtained
(approximately 300V) is applied to a forward converter stage which delivers a stabilised and mains-
isolated output.
The regulation circuit operates in voltage-mode. The primary side of this regulation circuit has a pulse
width modulation (P. W. M.) IC which controls the switching elements (MOSFET). On the secondary
side an error amplifier is provided from which data is transferred to the modulator through an
optocoupler, controlling the duty cycle and, thus, the output voltage.
The device incorporates output overload and short-circuit protection by means of a current limiting
circuit. It also incorporates output overvoltage protection. When the output voltage exceeds the limit
setting, a circuit of the control stage disables the stage. To reset the control stage, switch it off and then
on again to connect to the mains.
An optocoupler input is provided which allows the PSU output to be disabled and a remote detection
input enables the load voltage to be stabilised, thus offsetting the wire voltage drop.
INSTALLATION
The PSU can be secured with the plates supplied or the M4 threaded inserts on the base plate. It can
also be installed as a EUROCARD submodule of 6U F2 with 12Te pitch (check figure).
STARTUP
Connect the power supply unit directly to the mains, 220/230V.
If the mains has 110/115V, open the cover and set the overhead voltage switchover terminal to the
110V pin, (check figure). The use of remote sensing is not mandatory, but if it becomes necessary, use
of either a coax cable or a twisted pair is recommended.
If power levels close to the maximum are required, the mounting position should encourage proper
cooling conditions. The optimum position is vertical with the heatsink located at the top.
If several power supply units are to be used in parallel:
• Set the output voltage for all power supply units to ensure that the voltage difference between them
as small as possible.
• Join the outputs at the load by using wires with a cross-section no greater than the right wire and of
the same length.
• Do not use remote sensing.
For safety reasons, the following requirements must be met:
• An easily accessible mains disconnection device must be provided.
• When replacing the fuse, use another of the same rating and type, making sure the power supply
unit is isolated from the mains.
• Since hazardous voltages are present in the PSU when the unit is in operation, it should be installed
in such a way that access is limited to specialized personnel.
• Use a mains connection cable with a cross-section of at least 0.75 mm
• Connect the GND terminal to an earthing means.
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