User manual

Chapter 6 Control Modes of Operation ASDA-A User Manual

6-46

6-6-5 Electromagnetic Brake

When the servo drive is operating, if the BRKR is set to Off, it indicates the electromagnetic brake is disabled

and motor is stop running and locked. If the BRKR is set to ON, it indicates electromagnetic brake is enabled

and motor can run freely.

There are two setting methods of electromagnetic brake. One is using MBT1 (parameter P1-42) and the

other is using MBT2 (parameter P1-43) to set the relevant time delay. The electromagnetic brake is usually

used in perpendicular axis (Z-axis) and activated after the power is off. 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 users desire to control electromagnetic brake by themselves, not by the servo drive, users must execute

the function of electromagnetic brake during the servo motor is braking. The braking strength of motor and

electromagnetic brake must be in the same direction during braking. Then, the servo drive will operate

normally. However, the servo drive may generate greater current during acceleration or at constant speed

and it may the cause of overload (servo fault).

Timing chart when user servo motor with electromagnetic brake:

OFF

SON

(DI Input)

BRKR

(DO Output)

Motor Speed

MBT1(P1-42)

MBT2(P1-43)

ZSPD(P1-38)

OFF

BRKR output timing explanation:

1. After SERVO OFF, if reach the time set by P1-43 and the motor speed is still higher than the setting

value of P1-38, BRKR output is OFF (electromagnetic brake interlock).

2. After SERVO OFF, if not reach the time set by P1-43 and the motor speed is lower than the setting

value of P1-38, BRKR output is OFF (electromagnetic brake interlock).