User manual

ASDA-A User Manual Chapter 6 Control Modes of Operation
© DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 4th Edition 2005/11/30, HE03
6-43
For example:
When external load torque is a +70% rated torque and rotation speed reachs 3000 rpm, if using 400W
servo drive (rated torque: 1.27Nt-m), then users need to connect a external regenerative resistor which
power is 2 ͪ (0.7 ͪ 1.27) ͪ (3000 ͪ 2 ͪӸ/ 60) = 560W, 40:.
 Simple Calculation Method
User can select the adequate regenerative resistors according to the allowable frequency required by
actual operation and the allowable frequency when the servo motor run without load. The allowable
frequency when the servo motor run without load is the maximum frequency that can be operated during
continuous operation when servo motor accelerate from 0rpm to rated speed and decelerate from rated
speed down to 0rpm. The allowable frequencies when the servo motor run without load are summarized
in the following table.
Allowable frequencies when the servo motor run without load (times/min)
100W 200W 400W 750W 1.0kW 1.5kW 2.0kW 3.0kW
Servo Motor Models
01 02 04 07 10 15 20 30
ASMTϭϭL Series
12133 2022 1071 337 140 100 155 63
ASMTϭϭM Series
- - - - 136 93 104 38
When the servo motor run with load, the allowable frequencies will change according to the changes of
the load inertia and rotation speed. Use the following equation to calculate the allowable frequency.
Allowable frequency =
$OORZDEOHIUHTXHQFLHVZKHQVHUYRPRWRUUXQZLWKRXWORDG
m + 1
x
5DWHGVSHHG
Operating speed
5DWHGVSHHG
Operating speed
WLPHV
min.
2
m = load/motor inertia ratio
User can select the adequate regenerative resistors according to the allowable frequencies by referring
to the table below:
ASMTϭϭL Series ASMTϭϭM Series
100W 200W 400W 750W 1.0kW 2.0kW 3.0kW 1.0kW 1.5kW 2.0kW 3.0kW
Allowable
Frequencies
(times/min)
01 02 04 07 10 20 30 10 15 20 30
BR400W040 - - 7137 2247 933 - - 913 621 - -
BR1K0W020 - - - - 2333 1291 523 2282 1552 863 315