The Use Of Brake - Delta ASD-A2-0121 Series User Manual

Chapter 6 Control Mode of Operation

6.6.4 The Use of Brake

When operating brake via servo drive, if the DO signal, BRKR, is set to OFF, it means the brake is
not working and the motor will be locked. If BRKR is set to ON, it means the brake is working and
the motor can operate. The operation of brake has two kinds. Users can set the relevant delay time
with registers MBT1 (P1-42) and MBT2 (P1-43).
To avoid the mechanism from falling down, the magnetic brake is usually used to output an upward
force in the Z-axis direction so as to prevent the servo motor's continuous resistance which leads
to the overheat and shorter lifetime of the motor. In order to avoid the error of brake, it must be
worked when the servo drive is off.
Timing diagram of brake control:
SON
(DI Input)
BRKR
(DO Output)
Motor Speed
The output timing of BRKR:
1. When Servo Off, when the time set by P1-43 is exceeded and the motor speed is faster than
the setting in P1-38, DO.BRKR is OFF (the brake is locked).
2. When Servo Off, when the time set by P1-43 is not yet reached but the motor speed is
slower than the setting in P1-38, DO.BRKR is OFF (the brake is locked.).
6-62
8V
-8V
ON
OFF
ON
OFF
MBT1(P1-42)
DOF
OFF
OFF
MBT2(P1-43)
ZSPD(P1-38)
ASDA-A2