Chapter 2 Installation
ASDA-B2
2-16
Revision May, 2018
(2) Simple
Selection
Choose the appropriate regenerative resistor according to the allowable frequency and
empty load frequency in actual operation. The so-called empty allowable frequency is the
frequency of continuous operation when the servo motor runs from 0 r/min to the rated
speed and then decelerates from the rated speed to 0 r/min within the shortest time. The
following table lists the allowable frequency when the servo drive runs without load
(times/min).
Allowable Frequencies for Servo Motor Running Without Load (times/min)
When Using Built-in Regenerative Resistor
Motor Capacity
ECMA Series
600W
750W
900W 1.0kW 1.5kW 2.0kW 2.0kW 3.0kW
06
07
09
10
15
20
20
30
ECMA
C
- 312 - 137 -
83
(F100)
-
ECMA
E - - - 42
32
24
(F130)
10
(F180)
11
ECMA
G 42 - 31 - - - - -
When the servo motor runs with load, the allowable frequency will be different
according to different load inertia or speed. The following is the calculation method.
m represents load / motor inertia ratio.
Allowable fr equency =
Allowable frequency when serv o motor run without load
m + 1
x
Rated s peed
Operating speed
times
mi n.
2
The comparison table of external regenerative resistor is provided below. Please
choose the appropriate regenerative resistor according to the allowable frequency.
The table below describes the suggested allowable frequency (times/min) of
regenerative resistor when the servo drive runs without load.
Allowable Frequencies for Servo Motor Running Without Load (times/min)
When Using External Regenerative Resistor
Motor Capacity
Regenerative Resistor
ECMA
C
100W
200W
400W
(F60)
400W
(F80)
750W
1.0kW
2.0kW
01
02
04
04
07
10
20
200W 80
Ω
32793 6855 4380 1784 1074 458 273
400W 40
Ω
- - - - -
916
545
1kW 30
Ω
- - - - - -
1363