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User Manual
Rev. 1.0 - 05/04/13
PJ3500M-C & PJ5000U-K
Connection for the selection of 115V or 230V three fase with neutral wire
Following is a brief description of the different module functions; all diagrams and
board layout diagrams are included in the “Technical Schedule” Vol.2.
7.2 PS Section
7.2.1 Surge Protection
This card’s main function is to avoid any damage to the internal cards by blocking
the contact before current reaches the equipment in case overvoltages occur.
7.2.2 Power Supply
The three power supply modules are located in the middle part of the amplifier.
The power supply units are mounted on a cooling fin to cool the amplifier by forced
ventilation.
The amplifier houses a transformer the input voltage of which may be selected
between 115 and 230 Volts.
The transformer is fitted with three secondary wires: A) 18-0-18 V, B) 0-17 V, C)
0-11.5 V that supply power to the cards inside the equipment.
7.2.3 PFC Unit or Rectifier
The PFC unit is a rectifier that modulates the current absorbed so that the wave
shape is the most possible sinusoidal, obtaining a factor of power of 99%.
The PFC can work with input supply voltages from 90 V to 250 V. A rectified voltage
of 350 V is present on the output.
In place of PFC units, can be installed “traditional” rectifiers units (without power
factor corrector). Its task is to rectify and stabilize the shape of the voltage produced
by the power supply modules by fixing the voltage value to the value required by
the internal circuitry.
This card also applies a resistive load when the amplifier is turned on and excludes
said load after a short time to reduce current peaks in the transformer on turning
it on (SOFT-START).
