Chapter 2 Installation ASDA-A2
Revision February, 2017 2-15
(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 0r/min to the rated speed
and then decelerates from the rated speed to 0r/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)
and uses a built-in regenerative resistor
Motor Capacity
Servo Motor
600W 750W 900W
1.0
kW
1.5
kW
2.0
kW
2.0
kW
3.0
kW
4.5
kW
5.5
kW
7.5
kW
11.0
kW
15.0
kW
06 07 09 10 15 20 20 30 45 55 75 1B 1F
ECMAC - 312 - 137 -
83
(F100)
- - - - - - -
ECMAE - - - 42 32
24
(F130)
10
(F180)
11 - - - - -
ECMAF - - - - - - - 11 8 - - - -
ECMAG 42 - 31 - - - - - - - - - -
ECMAJ - 537 - - - - - - - - - - -
ECMAK - - - 162 122 - - - - - - - -
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 frequency =
Allowable frequency when servo motor run without load
m + 1
x
Rated speed
Operating speed
times
min.
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 frequency of regenerative resistor when the servo drive runs without load (times/min)
Motor Capacity
Corresponding Motor
ECMAC
100W 200W
400W
(F60)
400W
(F80)
750W 1.0kW 2.0kW
01 02 04 04 07 10 20
BR400W040 (400W 40Ω) - - 8608 3506 2110 925 562
BR1K0W020 (1kW 20Ω) - - - 8765 5274 2312 1406
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