Advertisement
Sigma II User's Manual
Note: Adequate cooling must be provided for regenerative resistors because they reach very high tempera-
tures. Also use heat-resistant, non-flammable wire and make sure that the wiring does not come into
contact with the resistors.
5.6.2
Calculating the Required Capacity of Regenerative Resistors
n
By Means of a Simple Calculation
When driving a servomotor normally along the horizontal axis, check the external
regenerative resistor requirements using the calculation method shown below.
Servo Amplifiers with 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
SGDH–A3BE
100V
SGDH–A5BE to –02BE
SGDH–A3AE,–A5AE
200V
SGDH–01AE to –04AE
Calculate the rotational energy in the servo system using the following equation:
Servo amplifier
Regenerative resistor
B1
B2
B3
Be sure to take out the lead wire
between the B2 and B3 terminals.
* The user must provide the regenerative resistor.
Regenerative Energy that
Applicable Servo
Amplifiers
E
S
Where: J = J
+ J
M
L
: Servomotor rotor inertia (kg·m
J
M
J
: Motor axis conversion load inertia (kg·m
L
N
: Rotation speed of thee servomotor (rpm)
M
Chapter 5: Parameter Settings and Functions
Can be Processed
(joules)
7.8
15.7
18.5
37.1
2
J x (N
)
M
=
182 (joules)
5-84
Remarks
Value when input voltage is
100V
AC
Value when input voltage is
200V
AC
2
2
) (oz·in·s
)
2
2
) (oz·in·s
)
Advertisement
