4 System Design
4-58
G5-series AC Servomotors and Servo Drives User’s Manual (with Built-in EtherCAT Communications)
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 absorbable by
built-in capacitor (J)
Internal regeneration resistor
Allowable
minimum
regeneration
resistance (Ω)
Average amount of
regenerative energy
absorbable (W)
R88D-KNA5L-ECT 11 − 17
R88D-KN01L-ECT 11 − 17
R88D-KN02L-ECT 15 − 17
R88D-KN04L-ECT 22 17 13
R88D-KN01H-ECT 18 − 34
R88D-KN02H-ECT 18 − 34
R88D-KN04H-ECT 26 − 34
R88D-KN08H-ECT 46 12 25
R88D-KN10H-ECT 74 18 25
R88D-KN15H-ECT 74 18 25
R88D-KN20H-ECT 74 72 10
R88D-KN30H-ECT 113 60 7
R88D-KN50H-ECT 113 60 5
R88D-KN75H-ECT 282 − 4
R88D-KN150H-ECT 254 − 4
R88D-KN06F-ECT 64 21 100
R88D-KN10F-ECT 64 21 100
R88D-KN15F-ECT 64 21 100
R88D-KN20F-ECT 64 29 40
R88D-KN30F-ECT 106 60 40
R88D-KN50F-ECT 106 60 29
R88D-KN75F-ECT 273 − 14
R88D-KN150F-ECT 492 − 14
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