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Chapter 6 Control Modes of Operation|ASDA-AB Series
Revision January 2009 6-39
For example:
When external load torque is a +70% rated torque and rotation speed reaches 3000r/min, if using 400W
servo drive (rated torque: 1.27Nt-m), then the users need to connect a external regenerative resistor
which power is 2 x (0.7 x 1.27) x (3000 x 2 x π/ 60) = 560W, 40Ω.
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 frequency when the servo motor run without load (times/min)
100W 200W 300W
400W
(60mm)
400W
(80mm)
500W 600W 750W
ECMA Series
01 02 03 04 04 05 06 07
Allowable Frequency
(times/min)
- - - 1275 519 43 41 319
900W
1.0kW
(100mm)
1.0kW
(130mm)
1.5kW
2.0kW
(100mm)
2.0kW
(130mm)
2.0kW
(180mm)
ECMA Series
09 10 10 15 20 20 20
Allowable Frequency
(times/min)
31 137 42 31 82 24 10
( ) : motor frame size, unit is in millimeters.
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 frequency when the servo motor run without load (times/min)
100W 200W 300W
400W
(60mm)
400W
(80mm)
ECMA Series
Regenerative
Resistors
01 02 03 04 04
BR400W040 - - - 8608 3279
BR1K0W020 - - - 21517 8765
( ) : motor frame size, unit is in millimeters.