Electromagnetic Brake - Delta ASD-B2-0121-B User Manual

Chapter 6 Control Modes of Operation
8V
DOF
-8V

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).
If the users desire to control electromagnetic brake via external controller, not by the
servo drive, the users must execute the function of electromagnetic brake during the
period of time when servo motor is braking. The braking strength of motor and
electromagnetic brake must be in the same direction when servo motor is braking. Then,
the servo drive will operate normally. However, the servo drive may generate larger
current during acceleration or at constant speed and it may the cause of overload (servo
fault).
6-41
Revision June 2010