ASDA-A2 Chapter 6 Control Mode of Operation
Revision February, 2017 6-57
monitor output, DOF1 (4-20) and DOF2 (P4-21). The voltage level of analog monitor output is ±8V,
if the output voltage exceeds the range, it will be limited within ±8V. The provided resolution is
about 10bits, which equals to 13mV/LSB.
8V
DOF
-8V
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 dealy via
regiser MBT1 (P1-42) and MBT2 (P1-43). It is usually applied in Z axis in order to reduce the heat
generated when servo motor puts up resistance and shorten its lifetime. In order to avoid the error
of brake, it must be worked when the servo drive is off. To operate the brake, the brake has to be
activated before the motor stops running (Servo OFF). The brake has to be released after Servo
ON. Otherwise, it would become the loading of the motor and might damage the brake.
If it works during the process of acceleration or constant speed, the servo drive needs to generate
more current to resist the brakeforce of brake and it might cause the alarm of overload warning.
Timing diagram of brake control:
OFF
ON
SON
(DI Input)
BRKR
(DO Output)
Motor Speed
MBT1(P1-42)
MBT2(P1-43)
ZSPD(P1-38)
ON
OFF
OFF
OFF
The output timing of BRKR:
1. When Servo OFF, go through the time set by P1-43 and the motor speed is faster than the
setting in P1-38, DO.BRKR is OFF (the brake is locked).
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