Delta Electronics AC Servo Drive ASDA-B User Manual
Page 150
Chapter 6 Control Modes of Operation|ASDA-B Series
Revision February 2008, Doc. Name: 2006PDD23000009
6-35
Motor Rotation Speed
External Load Torque
Motor Output Torque
Reverse
Rotation
Reverse
Rotation
Forward
Rotation
Forward
Rotation
External load torque in reverse direction: TL* 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 3000 rpm, if
using 400W servo drive (rated torque: 1.27Nt-m), then the users need to connect a external
regenerative resistor which power is 2
Ч (0.7 Ч 1.27) Ч (3000 Ч 2 Ч 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 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 frequency when the servo motor run without load (times/min)
100W
200W
300W
400W
(60mm)
400W
(80mm)
500W
600W
750W
ECMA Series Power
Range
(Frame Size)
01
02
03
04
04
05
06
07
Allowable Frequency
(times/min)
- - -
1275
519
43
41
319
900W
1.0kW
(100mm)
1.0KW
(130mm)
1.5KW
2.0kW
(100mm)
2.0KW
(130mm)
2.0KW
(180mm)
ECMA Series Power
Range
(Frame Size)
09
10
10
15
20
20
20
Allowable Frequency
(times/min)
31 137 42 31 82 24 10
Table 6.K