YASKAWA E-V Series Selection Manual

12.8 Regenerative Resistor
12.8.6 Selecting External Regenerative Resistor
12
SERVOPACK Peripheral Devices
12-37
12.8.6 Selecting External Regenerative Resistor
You can use one of two methods to manually calculate whether an External Regenerative
Resistor is required. Refer to the following sections.
Simple Calculation on page 12-37
Calculating the Regenerative Energy on page 12-42
Simple Calculation
When driving a Servomotor with a horizontal shaft, check if an External Regenerative Resistor
is required using the following calculation method. The calculation method depends on the
model of the SERVOPACK.
 SERVOPACK Models SGD7S-R70A, -R90A, -1R6A, -2R8A, -R70F,
-R90F,-2R1F,and -2R8F
Regenerative resistors are not built into the above SERVOPACKs. The total amount of energy
that can be charged in the capacitors is given in the following table.
If the rotational energy (E
S
) of the Servomotor and load exceeds the processable regenerative
energy, then connect an External Regenerative Resistor.
Calculate the rotational energy (E
S
) of the servo system with the following equation:
E
S
= J × (n
M
)
2
/182 (Joules)
• J = J
M
+ J
L
• J
M
: Servomotor moment of inertia (kg⋅m
2
)
• J
L
: Load moment of inertia at motor shaft (kg⋅m
2
)
• n
M
: Servomotor operating motor speed (min
-1
)
Applicable SERVOPACK
Processable Regenera-
tive Energy (Joules)
Remarks
SGD7S-
R70A, R90A,
1R6A
24.2
Value when main circuit input voltage is 200 VAC
2R8A 31.7
R70F, R90F, 2R1F 28.6
Value when main circuit input voltage is 100 VAC
2R8F 48.4

YASKAWA E-V Series Specifications

General

Brand	YASKAWA
Model	E-V Series
Category	Servo Drives
Language	English