Delta Electronics ASDA-A2 Series User Manual page 36

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Chapter 2 Installation and Storage
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, 40.
 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.
Allowable frequency when the servo motor runs without load (times/min)
Motor Capacity
Servo Motor
ECMA  C
ECMA  E
Revision January 2011
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Reverse
Forward
Rotation
Rotation
and uses a built-in regenerative resistor
600W 750W 900W 1.0kW 1.5kW 2.0kW 2.0kW 3.0kW 4.5kW 5.5kW 7.5kW
06 07 09 10
- 312 - 137
- - - 42
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Motor Rotation Speed
External Load Torque
Motor Output Torque
Reverse
Rotation
TL : External load torque
15 20 20
83
- -
(F100)
24 10
32
(F130) (F180)
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Forward
Rotation
30 45 55 75
- - - -
11 - - -
2-17
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