D2 Drive User Guide v1.8 8. Protection Function
HIWIN Mikrosystem Corp. 245
8.6. Over voltage protection
When the motor is decelerating, the kinetic energy is converted into the thermal energy for the
consumption. The remaining energy charges the drive’s capacitor. When the energy exceeds
the capacity of drive’s capacitor, the energy must be consumed on the regenerative resistor in
the regenerative circuit to protect the drive. The regenerative resistor of D2 drive has the
turn-on voltage of 370 Vdc and the turn-off voltage of 360 Vdc. Users can refer to the following
characteristic of each motor specification (under the deceleration of 10 m/s
2
and the screw
pitch of 10 mm) to determine whether the regenerative resistor is needed or not. Take the
motor of 750 W as an example. If the motor is operated at the highest speed of 3,000 rpm and
the load inertia is more than 0.00082 Kg-m
2
, a regenerative resistor is needed. Refer to Table
8-6 to select an appropriate regenerative resistor model.
Fig. 8-13 Motor regenerative curve of FRLS402XX
Fig. 8-14 Motor regenerative curve of FRMS4B2BX
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