Simple Calculation Method - Delta Electronics ASDA-A Series User Manual

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Chapter 6 Control Modes of Operation|ASDA-A&A+ Series
External load torque in reverse direction: TL x Wr
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
Servo Motor
ASMT
ASMT
6-42
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Reverse
Forward
Rotation
Rotation
Allowable frequency when the servo motor runs without load (times/min)
and uses built-in regenerative resistor
100W
Motor Capacity
01
L 12133
M -
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Motor Rotation Speed
External Load Torque
Motor Output Torque
Reverse
Rotation
TL : External load torque
200W 400W 750W
02 04 07
2022 1071 337
- - -
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Forward
Rotation
1.0kW 1.5kW 2.0kW
10 15 20
140 100 155
136 93 104
Revision April 2009
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3.0kW
30
63
38