SECTION FIVE – COMPONENT DESCRIPTION
DS2000 USER’S MANUAL (rev.C)
5.3
5.2.1.1 HIGH VOLTAGE RECTIFICATION AND FILTERING
The AC mains input is rectified by a three-phase diode bridge and filtered by a bank of
electrolytic capacitors to generate the internal DC BUS. This high power DC supply is
unregulated and will vary in direct proportion with the AC mains input voltage magnitude.
Inductance only for size E
Fig. 5.1 – Power input section
5.2.1.2 SOFT START
Soft start is used to limit the inrush current to the DC BUS capacitor bank on application of
AC mains power. This is intended to prevent blowing of line fuses on power-up.
The switch is a relay on DS2000 Series up to size B. It is an SCR on the other sizes.
The soft start switch will close when the monitoring circuit and associated control software
determines that the high-voltage DC BUS has charged up and the DC BUS is at steady
state.
If the DC BUS voltage suddenly changes at drive enable, it is possible that troubles are
present on the three-phase power line (interrupted fuse, missing connection, or
inadequate power supply) and the drive gives an error signal.
5.2.1.3 LOW VOLTAGE CONTROL POWER SUPPLY
Control power for the logic circuits is generated by a DC/DC converter, which provides
control-circuitry power that is isolated from the mains input. This control voltage also
powers the cooling fans.
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