3-45
Note
There is some loss due to winding resistance, so the actual regenerative energy will be approxi-
mately 90% of the values derived from these equations.
•
For Servo Driver models with internal capacitors for absorbing regenerative energy (i.e., models of
400 W or less.), the values for both Eg1 or Eg2 (unit: J) must be lower than the Servo Driver’s regen-
erative energy absorption capacity. (The capacity varies depending on the model. For details, refer to
3-3-2 Servo Driver Regenerative Energy Absorption Capacity
.)
•
For Servo Driver models with internal regeneration resistance for absorbing regenerative energy (i.e.,
models of 500 W or more), the average amount of regeneration P
r
(unit: W) must be calculated, and
this value must be lower than the Servo Driver’s regenerative energy absorption capacity. (The capac-
ity varies depending on the model. For details, refer to
3-3-2 Servo Driver Regenerative Energy Ab-
sorption Capacity
.)
The average amount of regeneration (P
r
) is the power consumed by regeneration resistance in one
cycle of operation.
P
r
= (E
g1
+ E
g2
+ E
g3
)/T
[W]
T: Operation cycle [s]
3-3-2 Servo Driver Regenerative Energy Absorption Capacity
H
Amount of Internal Regeneration Resistance in Servo Drivers
W-series Servo Drivers absorb regenerative energy by means of internal capacitors or resistors. If the
regenerative energy is more than can be processed internally, an overvoltage error is generated and
operation cannot continue. The following table shows the regenerative energy (and amount of regen-
eration) that the individual Servo Drivers themselves can absorb. If these values are exceeded, take the
following measures.
•
Connect external regeneration resistance (to improve the regeneration processing capacity).
•
Reduce the operating rotation speed. (The amount of regeneration is proportional to the square of the
rotation speed.)
•
Lengthen the deceleration time (to decrease the regenerative energy produced per time unit).
•
Lengthen the operation cycle, i.e., the cycle time (to decrease the average regenerative power).
System Design and Installation
Chapter 3
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