Calculating The Required Capacity Of Regenerative Resistors - YASKAWA SGM H Series User Manual

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.
Voltage SERVOPACK Model
A3BD, A3BDA
100 V
A5BD to 02BD
A5BDA to 02BDA
A3AD to A5AD
A3ADA to A5ADA
200 V
01AD to 04AD
01ADA to 04ADA
Calculate the rotational energy E
2
= J × (N
E )
S M
• J = J + J
M L
• J : Servomotor rotor moment of inertia (kg·m
M
• J : Load converted to shaft moment of inertia (kg·m
L
• N : Rotation speed used by servomotor (min
M
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Regenerative
Applicable
Energy that Can
be Processed
SGDM-
(joules)
7.8
15.7
18.5
37.1
in the servomotor from the following equation:
s
/182 (joules)
12.1 Servomotor Capacity Selection Examples
Remarks
Value when main circuit input voltage is 100 VAC
Value when main circuit input voltage is 200 VAC
2
)
2
)
-1
)
12
12-7