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11 Appendix
11.1.3 Calculating the Required Capacity of Regenerative Resistors
11-8
(b) SERVOPACKs with Capacities of 500 W to 5.0 kW
Servomotors with capacities of 500 W to 5.0 kW have built-in regenerative resistors. The allowable frequen-
cies for just the servomotor in acceleration and deceleration operation, during the rotation speed cycle from 0
(min
-1
) to the maximum rotation speed to 0, are summarized in the following table.
Convert the data into the values obtained with actual rotation speed and load moment of inertia to determine
whether an external regenerative resistor is needed.
Fig. 11.1 Operating Conditions for Allowable Regenerative Frequency Calculation
Use the following equation to calculate the allowable frequency for regeneration mode operation.
• n = J
L
/J
M
• J
M
: Servomotor rotor moment of inertia (kg·m
2
)
• J
L
: Load converted to shaft moment of inertia (kg·m
2
)
Voltage Series Allowable Frequencies in Regenerative Mode (times/min)
Capacity
Symbol
22 32 40 44 50
200 V SGMGH- †† A † A
− − − 11 −
SGMGH- †† A † B
− −
20
− −
SGMSH
− −
29
−
22
SGMDH
7 11 8
− −
400 V SGMGH
− − − 11 −
SGMSH
− −
29
−
22
SGMUH
− −
19
− −
Speed reference
Servomotor rotation speed
Servomotor-generated torque
Load moment of inertia = 0(servomotor only)
Regeneration mode
T
(Operating cycle)
Allowable frequency = 1/T (times/min)
Maximum rotation speed
Maximum torque
0
Maximum torque
0
0
t
t
t
Allowable frequency =
Allowable frequency for Servomotor only
(1 + n)
×
Max. rotation speed
Rotation speed
2
(times/min)