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12 CONTROL AUXILIARY FUNCTIONS
12.6 Absolute position restoration function
CAUTION
When absolute position restoration is performed, the servo ON signal may turn OFF
(the servo may switch off) for about 20ms, starting the motor. If any inconvenience
may be caused by the start of the motor when the servo ON signal turns OFF, provide
an electromagnetic brake separately to lock the motor with the electromagnetic brake
during absolute position restoration.
The "absolute position restoration function" is designed to restore the absolute position
of the specified axis. This function eliminates the need for a zero point return after
power-off, such as an instantaneous power failure or emergency stop, ensuring ease
of on-site restoration work.
The following details of the "absolute position restoration function" will be explained.
(1) Configuration and preparation of absolute position detection system
(2) Outline of absolute position detection data communication
(3) Connection example
(4) Precautions during control
[1] Configuration and preparation of absolute position detection system
(1) Configuration
The configuration of the absolute position detection system is shown below.
Refer to the servo amplifier manual for details of connection with the servo
amplifier.
Servo
amplifier
Power supply
Detector cable
Absolute position holding battery
Control signal connector
1)
2)
3)
Servomotor with absolute position detector
D75P2
PLC
CPU
4)
Connection cable
Master
module
Fig. 12.31 Configuration of absolute position detection system