Delta Electronics ASDA-AB Benutzerhandbuch

Chapter 6  Control Modes of Operation|ASDA-AB Series 

Revision January 2009 

 

 

6-43 

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.