YASKAWA Sigma II Series User Manual

12.1 Servomotor Capacity Selection Examples
12-7
12
Appendix
12.1.3 Calculating the Required Capacity of Regenerative Resistors
(1) Simple Calculation
When driving a servomotor with the horizontal axis, check the external regenerative resistor requirements using
the calculation method shown below.
(a) 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 rotational energy in the servomotor
exceeds these values, then connect an external regenerative resistor.
Calculate the rotational energy E
s
in the servomotor from the following equation:
E
S
= J × (N
M
)
2
/182 (joules)
• J = J
M
+ J
L
• J
M
: Servomotor rotor moment of inertia (kg·m
2
)
• J
L
: Load converted to shaft moment of inertia (kg·m
2
)
• N
M
: Rotation speed used by servomotor (min
-1
)
Voltage
Applicable SERVO-
PACK Model SGDM-
Regenerative
Energy that Can
be Processed
(joules)
Remarks
100 V
A3BD, A3BDA
7.8
Value when main circuit input voltage is 100 VAC
A5BD to 02BD
A5BDA to 02BDA
15.7
200 V
A3AD to A5AD
A3ADA to A5ADA
18.5
Value when main circuit input voltage is 200 VAC
01AD to 04AD
01ADA to 04ADA
37.1

YASKAWA Sigma II Series Specifications

General

Brand	YASKAWA
Model	Sigma II Series
Category	Controller
Language	English