4-55
4-4 Regenerative Energy Absorption
OMNUC G5-SERIES AC SERVOMOTOR AND SERVO DRIVE USER'S MANUAL
4
System Design
Determining the Capacity of Regenerative Energy Absorption by Built-in Capacitors
If both the values Eg1 and Eg2 [J] mentioned above are equal to or less than the value of the
Servo Drive’s regenerative energy that can be absorbed by built-in capacitors Ec [J], the Servo
Drive can process regenerative energy only by its built-in capacitors.
If either the value E
g1 or Eg2 [J] exceeds the value of the Servo Drive’s regenerative energy that
can be absorbed by built-in capacitors Ec [J], however, use the following equations to
determine the average regeneration power Pr [W].
Note. If the expression (Eg1 - Ec) result is zero or less, regard it as 0. The expression (Eg2 - Ec) must also
be handled in the same way.
The above expressions calculate the average regeneration power Pr [W], which cannot be
absorbed by the built-in capacitors. If this average regeneration power Pr [W] is equal to or less
than the average amount of regeneration that can be absorbed by the Servo Drive’s Internal
Regeneration Resistor, the Servo Drive can independently process the regenerative energy.
If this average regeneration power Pr [W] cannot be processed only by the Servo Drive, take
the following processes.
Connect an External Regeneration Resistor. (Regeneration process capacity improves.)
Reduce the 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.)
Ec1Eg
=
E
g
(
−
) [J]
P
r
Eg
Ec
T
+
ET
g
=
P
r
[W]
/
: Operation cycle [s]
: Average regeneration power that must be absorbed in 1 cycle of operation [W]
: Regenerative energy that must be absorbed in 1 cycle of operation [J]
: Regenerative energy that can be absorbed by built-in capacitors [J]
2Eg Ec
(
−
)
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