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Chapter 6 Control Modes of Operation|ASDA-B Series
6-36 Revision February 2008, Doc. Name: 2006PDD23000009
When the servo motor runs with load, the allowable frequencies 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 frequencies 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
500W 600W 750W 900W
1.0kW
(100 mm)
ECMA Series
Regenerative
Resistors
05 06 07 09 10
BR400W040 291 283 2128 213 925
BR1K0W020 729 708 5274 533 2312
1.0KW
(130mm)
1.5KW
2.0kW
(100mm)
2.0KW
(130mm)
2.0KW
(180mm)
ECMA Series
Regenerative
Resistors
10 15 20 20 20
BR400W040 283 213 562 163 68
BR1K0W020 708 533 1363 408 171
( ) : motor frame size, unit is in millimeters.
Table 6.L
6.6.4 Electromagnetic Brake
When the servo drive is operating, if the digital output BRKR is set to Off, it indicates the
electromagnetic brake is disabled and motor is stop running and locked. If the digital output BRKR is set
to ON, it indicates electromagnetic brake is enabled and motor can run freely.
There are two parameters that affect the electromagnetic brake. One is parameter P1-42 (MBT1) and
the other is parameter P1-43 (MBT2). The users can use these two parameters to set the On and Off
delay time of electromagnetic brake. The electromagnetic brake is usually used in perpendicular axis (Z-
axis) direction to reduce the large energy generated from servo motor. Using electromagnetic brake can
avoid the load may slip since there is no motor holding torque when power is off. Without using
electromagnetic brake may reduce the life of servo motor. To avoid malfunction, the electromagnetic
brake should be activated after servo system is off (Servo Off).