Mitsubishi Electric MELSERVO-J5 User Manual page 313

Using a servo motor with an electromagnetic brake
The following shows the timing chart at power on/off and SON on/off.
Preset [Pr. PD23] to [Pr. PD26], [Pr. PD28], and [Pr. PD47] of the servo amplifier to enable MBR.
When MBR is set for the CN3-23 pin, turning ABSM on will change the CN3-23 pin to ABSB1 (ABS transmission data bit 1).
Therefore, configure an external sequence to generate the electromagnetic brake torque at ABSM or MBR off.
ON
Power supply
OFF
SON (Servo-on)
ABSM (ABS transfer mode)
ABSR (ABS request)
ABST (ABS transmission data ready)
ABSB0 (ABS transmission data bit 0)
ABSB1 (ABS transmission data bit 1)
Base circuit
RD (Ready)
MBR (Electromagnetic brake interlock)
Electromagnetic brake torque
How to process the absolute position data at stroke end detection
The servo amplifier stops receiving the command pulse when LSP or LSN off is detected, and at the same time clears the
droop pulses, and stops the servo motor. At this time, the programmable controllers continue outputting the command pulse.
Since this causes a discrepancy between the absolute position data of the servo amplifier and the programmable controller,
position mismatch will occur if the operation is continued.
When the servo amplifier has detected the stroke end, release stroke end detection by JOG operation and the like, urn on
SON again or cycle the power. By cycling the power, the absolute position data of the servo amplifier is transferred to the
programmable controllers, and the normal absolute position data is restored.
ON
OFF
ON
During ABS transfer
OFF
ON
OFF
ON
OFF
Absolute position
data
ON
OFF
ON
OFF
ON
OFF
ON
OFF
During ABS transfer
Absolute position
data
100 ms
5 ms
Tb
7 ABSOLUTE POSITION DETECTION SYSTEM
7.3 Absolute position detection system by DIO [A]
100 ms
5 ms
Tb
311
7