
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
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 change according to
the changes of the load inertia and rotation speed. Use the following equation to
calculate the allowable frequency.
Allowable fr equency =
Allowable frequency when serv o motor run without load
m + 1
x
Rated s peed
Operating speed
times
mi n.
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 80
Ω
32793 6855 4380 1784 1074 458 273
400W 40
Ω
- - - - -
916
545
1kW 30
Ω
- - - - - -
1363
VARITEL INGENIERIA ELECTRONICA S.A.
[email protected] - www.varitel.com - Tel. (54) 11-4243-1171 / Fax: (54) 11-4292-7545
Manuel Baliña 456, Lomas de Zamora (B1832CCJ) Buenos Aires, Argentina.