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12. ABSOLUTE POSITION DETECTION SYSTEM
12. ABSOLUTE POSITION DETECTION SYSTEM
CAUTION
If an absolute position erase alarm (25) or absolute position counter warning (E3)
has occurred, always perform home position setting again. Not doing so can cause
runaway. Not doing so may cause unexpected operation.
POINT
If the encoder cable is disconnected, absolute position data will be lost in the
following servo motor series. HF-MP, HF-KP, HC-SP, HC-RP, HC-UP, HC-LP,
and HA-LP. After disconnecting the encoder cable, always execute home
position setting and then positioning operation.
12.1 Features
For normal operation, as shown below, the encoder consists of a detector designed to detect a position within
one revolution and a cumulative revolution counter designed to detect the number of revolutions.
The absolute position detection system always detects the absolute position of the machine and keeps it
battery-backed, independently of whether the servo system controller power is on or off.
Therefore, once home position return is made at the time of machine installation, home position return is not
needed when power is switched on thereafter.
If a power failure or a fault occurs, restoration is easy.
Servo system controller
Current
position
Home position data
LS0
CYC0
Servo amplifier
Position data
Detecting
the number
of revolutions
Detecting the
position within
one revolution
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High speed serial
communication
Servo motor
1 pulse/rev accumulative revolution counter
Within one-revolution counter
MR-J3BAT
Battery