Chapter 6 Control Modes of Operation|ASDA-A&A+ Series
6-42 Revision April 2009
Motor Rotation Speed
External Load Torque
Motor Output Torque
Reverse
Rotation
Reverse
Rotation
Forward
Rotation
Forward
Rotation
External load torque in reverse direction: TL x Wr TL : External load torque
For the safety, we strongly recommend the users should select the proper resistance value according to
the load.
For example:
When external load torque is a +70% rated torque and rotation speed reaches 3000r/min, if using 400W
servo drive (rated torque: 1.27Nt-m), then the users need to connect a external regenerative resistor
which power is 2 x (0.7 x 1.27) x (3000 x 2 x π/ 60) = 560W, 40Ω.
Simple Calculation Method
The users can select the adequate regenerative resistors according to the allowable frequency required
by actual operation and the allowable frequency when the servo motor runs 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 0r/min to rated speed and decelerate from
rated speed down to 0r/min. The allowable frequencies when the servo motor run without load are
summarized in the following table.
ASDA-A Series
Allowable frequency when the servo motor runs without load (times/min)
and uses built-in regenerative resistor
100W 200W 400W 750W 1.0kW 1.5kW 2.0kW 3.0kW
Motor Capacity
Servo Motor
01 02 04 07 10 15 20 30
ASMTL 12133 2022 1071 337 140 100 155 63
ASMTM - - - - 136 93 104 38
Call 1(800)985-6929 for Sales
Call 1(800)985-6929 for Sales
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