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Chapter 6 Control Modes of Operation|ASDA-AB Series
Revision January 2009 6-43
6.6.5 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).
Timing chart for using servo motor with electromagnetic brake:
OFF
ON
SON
(DI Input)
BRKR
(DO Output)
Motor Speed
MBT1(P1-42)
MBT2(P1-43)
ZSPD(P1-38)
ON
OFF
OFF
OFF
BRKR output timing explanation:
1. When SERVO OFF (when DI SON is not activated), the BRKR output goes Off (electromagnetic
brake is locked) after the delay time set by P1-43 is reached and the motor speed is still higher
than the setting value of P1-38.
2. When SERVO OFF (when DI SON is not activated), the BRKR output goes Off (electromagnetic
brake is locked) if the delay time set by P1-43 is not reached and the motor speed is still lower
than the setting value of P1-38.