Delta ASDA-B2 Series - Page 37

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 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 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 80Ω 32793 6855 4380 1784 1074 458 273
400W 40Ω - - - - - 916 545
1kW 30Ω - - - - - - 1363