Technical Notes - powersoft DIGAM series User Manual

Technical Notes

DIGAM amplifiers cannot work in bridge connection
The DIGAM amplifier has an automatic power factor correction system for a perfect main network interface. The
amplifier is a resistive load for the main network, minimizing the reactive power and the harmonic distortion on the
current. The system allows performance to be maintained even in circumstances of varying the mains voltage.
The output stage of the amplifier is a bridge configuration with both outputs ( positive and negative ) not refered to
ground. A DC voltage is present between these outputs and the ground ( Chassis ). This voltage is variable and
depends on the model from 40VDC to 80VDC .
The connection of the processors equipped with a "feed-back" system must be done decoupling this voltage by
capacitor.
The formula that rules the capacitor value and the schematic application are the following.
C 1 / (30*Zin) where Zin is the input impedance of the processor used.
IMPORTANT : If decoupling is not performed the amplifier may go in protect mode.
In
POWERSOFT
+Vcc
c
C
Processor
ENGLISH - 11
One channel of DIGAM
Out