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4 System Design
OMNUC G5-series (Pulse-train Input Type) AC Servomotors and Servo Drives User’s Manual
4-4 Regenerative Energy Absorption
4
4-4-2 Servo Drive Regeneration Absorption Capacity
This Servo Drive absorbs regenerative energy internally with built-in capacitors.
If the regenerative energy is too large to be processed internally, an overvoltage error occurs and
operation cannot continue.
The following table shows the regenerative energy (and amount of regeneration) that each drive can
absorb. If these values are exceeded, take the following processes.
• Connect an External Regeneration Resistor. (Regeneration process capacity improves.)
• Reduce the operating rotation speed. (The amount of regeneration is proportional to the square of
the rotation speed.)
• Lengthen the deceleration time. (Regenerative energy per unit time decreases.)
• Lengthen the operation cycle, i.e., the cycle time. (Average regenerative power decreases.)
4-4-2 Servo Drive Regeneration Absorption Capacity
Amount of Internal Regeneration Absorption in Servo Drives
Servo Drive model
Regenerative energy
to be absorbed by built-in
capacitor (J)
Internal regeneration
resistor
Allowable minimum
regeneration resistance
(Ω)
Average amount of
regenerative energy to
be absorbed (W)
R88D-KP01H 18 – 34
R88D-KP02H 18 – 34
R88D-KP04H 26 – 34
R88D-KP08H 46 12 25
R88D-KP10H 74 18 25
R88D-KP15H 74 18 25
R88D-KP20H 74 72 10
R88D-KP30H 113 60 7
R88D-KP50H 113 60 5
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