Regeneration; Overview Of Regenerative Energy - Servotronix CDHD2S User Manual

Drive Setup
Logic power supply (L1C-L2C): After turning off the logic power supply, wait for 1 minute before
turning it on again.
Procedure: Connect power
1. Connect the AC input voltage ground wire to the PE terminal located on the front panel of
the CDHD2S. Use M4 ring terminal or sector terminal.
2. Connect L1, L2 and L3 (for bus power).
If the main voltage comes from a single-phase supply, connect the line and neutral line
◼
to L1 and L3.
If the main voltage comes from a three-phase supply, connect the phases to L1, L2 and
◼
L3.
3. Connect L1C and L2C (for logic power).
If the main voltage comes from a single-phase supply, connect the line and neutral line
◼
to L1C and L2C.
If the main voltage comes from a three-phase supply, connect any two phases to L1C
◼
and L2C.

4.11 Regeneration

4.11.1 Overview of regenerative energy

When the motor and load decelerate rapidly, the kinetic energy of the load drives the motor
shaft energy back into the drive; this is called regenerative energy, or regeneration. This energy
must be dissipated or absorbed.
The undissipated regenerated energy is added to the electrical energy already stored in the
bus module capacitors. If the capacitor can store this energy, the system does not require a
regenerative resistor.
In some cases, usually due to a high inertia mismatch between the load and motor, too much
energy is added to the capacitor, causing the voltage on the capacitor to reach the overvoltage
threshold, which then causes the drive to be disabled. To prevent overvoltage and potential damage
to the system, excess regeneration energy must be dissipated through a regenerative resistor.
—93—
Figure 4-40 Ground terminal