Omron R88M-1M Series User Manual page 432

4 Configuration and Wiring
 Regenerative Energy Absorption by Built-in Capacitor
If both of the previously mentioned values Eg1 and Eg2 [J] are smaller than or equal to the amount
of regenerative energy Ec [J] that the Servo Drive's built-in capacitor can absorb, the built-in capaci-
tor can process all regenerative energy.
If either of Eg1 and Eg2 [J] is larger than the amount of regenerative energy Ec [J] that the Servo
Drive's built-in capacitor can absorb, use the following equation to calculate the average amount of
regenerative power Pr [W].
E g = (E g1 - E ) c
[W]
P r = E / g T
P r : Average regenerative power that must be absorbed in one cycle of operation [W]
Eg : Regenerative energy that must be absorbed in one cycle of operation [J]
: Regenerative energy that the drive's built-in capacitor can absorb [J]
Ec
T : Operation cycle [s]
Note If the result of (E
(E - E
g2 c
The above equation calculates the average regenerative power Pr [W] that cannot be absorbed by
the built-in capacitor.
If this average regenerative power Pr [W] is smaller than or equal to the average regenerative power
which the Servo Drive's Internal Regeneration Resistor can absorb, the Servo Drive can process all
regenerative energy.
If the Internal Regeneration Resistor cannot process the average regenerative power Pr [W], take
the following measures.
• Connect an External Regeneration Resistor. Regenerative process capacity improves.
• Reduce the operating rotation speed. The amount of regenerative energy 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.
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AC Servomotors/Servo Drives 1S-series with Built-in EtherCAT® Communications User's Manual (I586)
(E g2 - E ) c [J]
+
- E ) is zero or less, then assign 0 to the result. The same applies to the case where
g1 c
) is zero or less.