Chapter 2 Installation
(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 frequency when the servo motor runs without load (times/min)
Motor Capacity
Servo Motor
ECMAC
ECMAE
ECMAF
ECMAG
ECMAJ
ECMAK
ECMAL
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 =
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 frequency of regenerative resistor when the servo drive runs without load (times/min)
Corresponding Motor
BR400W040 (400 W 40Ω)
BR1K0W020 (1 kW 20Ω)
and uses a built-in regenerative resistor
1.0
600
750
900
W
W
W
kW
06
07
09
10
-
312
-
137
-
-
-
42
-
-
-
-
42
-
31
-
-
537
-
-
-
-
-
162 122
-
-
-
-
Allowable frequency when serv o motor run without load
Motor Capacity
100 W
01
-
-
1.5
2.0
2.0
3.0
kW
kW
kW
kW
15
20
20
30
83
-
-
-
(F100)
24
10
32
11
(F130)
(F180)
-
-
-
11
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
m + 1
ECMA
400 W
400 W
200 W
(F60)
(F80)
02
04
04
-
8608
3506
-
-
8765
4.5
5.5
7.5
11.0
kW
kW
kW
kW
45
55
75
1B
-
-
-
-
-
-
8
-
-
-
-
-
-
-
-
-
-
-
-
-
-
Rated s peed
x
Operating speed
C
750 W
1.0 kW
07
10
2110
925
5274
2312
ASDA-A2
15.0
kW
1F
-
-
-
-
-
-
-
-
-
-
-
-
-
-
2
times
mi n.
2.0 kW
20
562
1406
2-17