YASKAWA SGMAH, User Manual

Page: 172 / 488

Sigma II User’s Manual Chapter 5: Parameter Settings and Functions
5-88
Use the equation in the following section to calculate the allowable frequency from
the servo system’s operating conditions and load inertia.
Operating Conditions for Allowable Regenerative Frequency
Calculation
Use the following equation to calculate the allowable frequency for regeneration
mode operation.
Where: n = J
L
/J
M
J
L
: Motor axis conversion load inertia (kg-m
2
)
J
M
: Servomotor rotary inertia (kg-m
2
)
Allowable frequency =
1 Cycles
T Minute
Speed reference
Servomotor rotation speed
Servomotor-generated torque
Load inertia = 0 (motor only)
Regeneration mode
T
(Operating cycle)
Maximum rotation speed
Maximum cycle
0
Maximum cycle
0
0
t
t
t
Allowable frequency =
Allowable frequency for servomotor only
(1 + n)
×
( )
Max. rotation speed
Rotation speed used
2
Cycles
Minute