Omron R88D-KN ML2 Sries User Manual

4-48
4-4 Regenerative Energy Absorption
OMNUC G5-Series AC Servo Drives Users Manual (Built-in MECHATROLINK-II communications type)
4
System Design
 For Servo Drive models with internal capacitors used for absorbing regenerative energy (i.e.,
Servo Drive models of 400 W or less), the values for both Eg
1
or Eg
2
(unit: J) must be lower than
the drive's regeneration absorption capacity. (The capacity depends on the model.For details,
refer to the next section.)
 For
Servo Drive models with an Internal Regeneration Resistor used for absorbing regenerative
energy (i.e., Servo Drive models of 500 W or more), the average amount of regeneration Pr (unit:
W) must be calculated, and this value must be lower than the drive's regeneration absorption
capacity. (The capacity depends on the model.For details, refer to the next section.)
The average regeneration power (Pr) is the regeneration power produced in 1 cycle of
operation [W].
The method for calculating regenerative energy on the vertical axis is indicated below.
 In the output torque graph, acceleration in the forward direction (rising) is shown as positive, and
acceleration in the reverse direction (falling) is shown as negative.
 The regenerative energy values in each region can be derived from the following equations.
Note. Due to the loss of winding resistance, the actual regenerative energy will be approx. 90% of the
values derived from these equations.
2Eg1Eg
=
Pr ( + ) / T[W]
T: Operation cycle [s]
Motor operation
Motor output torque
+N1
−N2
t 1 t 2 t 3
T
E
g1
EE
Upward movement
Downward movement
T
D2
TL2
TD1
Eg21
g22
g22
E
g21
E
g22
E
g2
E
g21
+
E
g22
N
1
,
N
2
: Rotation speed at start of deceleration [r/min]
: Deceleration torque [N
·
m]
: Torque during downward movement [N
·
m]
: Deceleration time [s]
:
Constant-speed driving time during downward movement [s]
T
D1
,
T
D2
t
1
,
t
3
T
L2
t
2

Omron R88D-KN ML2 Sries Specifications

General

Brand	Omron
Model	R88D-KN ML2 Sries
Category	Servo Drives
Language	English