12 Appendix
12.2.1 Simple Calculation
12-4
12.2 Calculating the Required Capacity of Regenerative Resistors
12.2.1 Simple Calculation
When driving a linear servomotor with the horizontal axis, check the external regenerative resistor requirements
using the calculation method shown below.
(1) SERVOPACKs with Capacities of 400 W or Less
SERVOPACKs with capacities of 400 W or less do not have built-in regenerative resistors. The energy that
can be charged with capacitors is shown in the following table. If the kinetic energy in the linear servomotor
exceeds these values, then connect an external regenerative resistor.
(2) SERVOPACKs with Capacities of 500 W to 5.0 kW
SERVOPACKs with capacities of 500 W to 5.0 kW have built-in regenerative resistors. The allowable fre-
quencies for just the servomotor in acceleration and deceleration operation, during the motor speed cycle
from 0 (m/s) to the maximum speed to 0, are summarized in the following table.
Convert the data into the values obtained with actual rotation speed and load mass to determine whether an
external regenerative resistor is needed.
Voltage
Applicable
SERVOPACKs
Regenerative
Energy that Can
be Processed
(joules)
Remarks
200 V
SGDH -A5AE
18.5
Value when main circuit input voltage is 200 VAC
SGDH-01AE to -04AE
37.1
Calculate the kinetic energy
E
S
) in the linear servomotor from the following equation.
E
S
=
MV
M
2
/ 2
M
Load mass kg
V
M
Speed used by linear servomotor
m/s
Linear Servomotor Model
Allowable Frequencies in
Regenerative Mode (times/min.)
Load Condition
(Including Coil
Assembly)
SGLGW-
40A365C (-M)
4
15 times of coil
assembly mass
60A253C (-M)
4
60A365C
3
60A365C (-M)
3
90A200C
1
90A370C
1
90A535C
6
SGLFW-
35A230A
8
Twice of coil
assembly mass
50A200B
6
50A380B
2
1ZA200B
2
1ZA380B
2
Summary of Contents for SGLFW
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