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4-4 Regenerative Energy Absorption
OMNUC G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
4
System Design
Servo Drive Regeneration Absorption Capacity
Amount of Internal Regeneration Absorption in Servo Drives
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 Unit. (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.)
Servo Drive model
Regenerative
energy absorbable by
built-in capacitor (J)
Internal regeneration re-
sistor
Allowable mini-
mum regeneration
resistance (Ω)
Average amount of
regenerative energy ab-
sorbable (W)
R88D-KNA5L-ECT-R 16 − 17
R88D-KN01L-ECT-R 16 − 17
R88D-KN02L-ECT-R 22 − 17
R88D-KN04L-ECT-R 32 17 13
R88D-KN01H-ECT-R 25 − 34
R88D-KN02H-ECT-R 25 − 34
R88D-KN04H-ECT-R 36 − 34
R88D-KN08H-ECT-R 62 12 25
R88D-KN10H-ECT-R 99 18 25
R88D-KN15H-ECT-R 99 18 25
R88D-KN20H-ECT-R 99 72 10
R88D-KN30H-ECT-R 150 60 7
R88D-KN50H-ECT-R 150 60 5
R88D-KN06F-ECT-R 85 21 100
R88D-KN10F-ECT-R 85 21 100
R88D-KN15F-ECT-R 85 21 100
R88D-KN20F-ECT-R 85 29 40
R88D-KN30F-ECT-R 142 60 40
R88D-KN50F-ECT-R 142 60 29
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