Chapter 2 Installation and Storage ASDA-B2
2-12 Revision September 2013
(2) 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
runs 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 0r/min to rated speed and decelerate from rated speed down to 0r/min.
The allowable frequencies when the servo motor run without load are summarized in the
following table.
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
ECMAC - 312 - 137 -
83
(F100)
-
ECMAE - - - 42 32
24
(F130)
10
(F180)
11
ECMAG 42 - 31 - - - - -
When the servo motor runs with load, the allowable frequency will change according to
the changes of the load inertia and rotation speed. Use the following equation to
calculate the allowable frequency.
Allowable frequency =
Allowable frequency when servo motor run without load
m + 1
x
Rated speed
Operating speed
times
min.
2
m = load/motor inertia ratio
The users can select the adequate regenerative resistors according to the allowable
frequency by referring to the table below:
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
VARITEL INGENIERIA ELECTRONICA S.A.
info@varitel.com - www.varitel.com - Tel. (54) 11-4243-1171 / Fax: (54) 11-4292-7545
Manuel Baliña 456, Lomas de Zamora (B1832CCJ) Buenos Aires, Argentina.
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