Electromagnetic Brake - Delta ASDA-A2 Series User Manual

monitor output does not match to the zero point of setting value. We recommend the users can use
Analog Monitor Output Drift Adjustment, DOF1 (parameter P4-20) and DOF2 (parameter P4-21) to
improve this condition. The maximum output voltage range of analog monitor output is ±8V. If the
output voltage exceed its limit, it is still limited within the range of ±8V. The revolution provided by
ASDA-A2 series servo drives is 10bit, approximated to 13mv/LSB.

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).
Timing chart for using servo motor with electromagnetic brake:
SON
OFF
(DI Input)
BRKR
OFF
(DO Output)
Motor Speed
Revision April, 2010
Chapter 6 Control Modes of Operation|ASDA-A2 Series
ON
ON
MBT1(P1-42)
8V
DOF
-8V
MBT2(P1-43)
ZSPD(P1-38)
OFF
OFF
6-55