Omron XTRADRIVE User Manual

XtraDrive User Manual Chapter 5: Parameter Settings and Functions
5-74
5.6.2. Calculating the Regenerative Power Capacity
 Simple Calculation Method
When driving a servomotor normally along the horizontal axis, check
the external regenerative resistor requirements using the calculation
method shown below.
Servo Amplifiers with a Capacity of 400W or Less
Servo amplifiers with a capacity of 400W or less do not have built-in
regenerative resistors. The energy that can be absorbed by capacitors is
shown in the following table. If the rotational energy in the servo
system exceeds these values, then connect a regenerative resistor
externally.
Voltage
Applicable Servo
Amplifiers
Regenerative Energy
that Can Be Processed
(Joules)
Comments
XD-P3-**, -P5-** 18.5
200V
XD-01-** to -04-** 37.1
Value when the input voltage
is 200V AC
Calculate the rotational energy in the servo system using the following
equation:
E
S
=
(
)
12566
Nx J
2
M
Joules
Where: J = J
M
+ J
L
J
M
: Servomotor rotor inertia (kg·m
2
) (oz·in·s
2
)
J
L
: Motor axis conversion load inertia (kg·m
2
) (oz·in·s
2
)
N
M
: Rotation speed of the servomotor (rpm)
Servo Amplifier Capacity of 0.8 to 3.0kW
Servomotors with a capacity of 500W to 5kW have built-in regenerative
resistors. The allowable frequencies for just the servomotor during
acceleration/deceleration operation, in the run cycle from 0 
maximum rotation speed  0, are summarized in the following table.
Convert the data into the values obtained with actual rotation speed
used and load inertia to determine whether an external regenerative
resistor is needed.

Omron XTRADRIVE Specifications

General

Brand	Omron
Model	XTRADRIVE
Category	Computer Hardware
Language	English