Absolute Position System - Mitsubishi Electric Q172CPU Programming Manual

8 AUXILIARY AND APPLIED FUNCTIONS

8.4 Absolute Position System

After removing or replacing the battery unit, correctly install the new unit and set the absolute
position.
After a servo battery error occurs, eliminate the cause of the error and ensure operation is safe
before setting the absolute position.
After the mechanical system is disturbed by a shock, make the necessary checks and repairs,
and ensure operation is safe before setting the absolute position.
The positioning control for absolute position system can be performed using the
absolute-position-compatible servomotors and servo amplifiers.
If the machine position is set at the system starting, home position return is not
necessary because the absolute position is detected at the power on.
The machine position is set with the home position return using the Motion program or
a peripheral device.
The vector inverter does not support an absolute position.
(1) Conditions of the absolute position system start
Perform a home position return after machine adjustment at the absolute position
system start.
(2) In the absolute positioning system, the absolute position may be lost as the
following cases:
Set the absolute position with a home position return.
(a) The battery unit is removed or replaced.
(b) The battery error of the servo amplifier occurs. (It is detected at the servo
amplifier power on).
(c) The machine system is disturbed by a shock.
(d) The cable between servo amplifier and encoder is removed, or the servo
amplifier or encoder is replaced.
CAUTION
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