Chapter 6 Control Modes of Operation
Because there is an offset value of analog monitor output voltage, the zero voltage level
of analog 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.
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).
Revision January 2011 6-57
Call 1(800)985-6929 for Sales
Call 1(800)985-6929 for Sales
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