SECTION FIVE – COMPONENT DESCRIPTION
DS2000 USER’S MANUAL (rev.C)
5.4
5.2.1.4 RECOVERY CIRCUIT
Rapid motor deceleration or an overhauling load creates a situation in which energy is
returned back into the DC BUS. This recovery energy will charge up the power supply DC
BUS capacitors. To prevent capacitor overvoltage, a shunt regulator circuit senses when
the DC BUS voltage exceeds the recovery cut-in voltage and via a recovery IGBT,
switches a recovery resistor across the DC BUS to dissipate the recovery energy.
Hysteresis in the circuit keeps the recovery circuit active until the DC BUS voltage is
reduced below the recovery cutout voltage.
The drive controls the braking circuit thresholds according to the different power supply
voltages with no need for hardware calibration or setting.
WARNING: High Voltage. The recovery resistor is connected to the Bus Bar’s and can
have voltage ≥810V
dc
.
WARNING: do not touch recovery resistor during operation to avoid scalds.
CAUTION: In applications where the working cycle implies decelerations with high inertial
loads, from high velocity in very short deceleration time, it is necessary to properly size
the recovery resistor. In these cases, please contact Moog Service Centers.
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