Loss And Restoration Of Absolute Position Data - Mitsubishi Electric C80 series Maintenance Manual

C80 Series Maintenance Manual
7 Appx.1: Types of Backup Data

7.2 Loss and Restoration of Absolute Position Data

Any of the followings may result in the loss of absolute position data.
Changing a parameter related to absolute position
Writing a parameter which was acquired when the zero point was in a different position
SRAM clear of NC
Failure in NC absolute position data
Low battery or uninstallation of the battery of servo drive
Disconnection of detector cable of servo drive
The absolute position data can be restored by backup/restoration function or SRAM data.
Restoration by backup/restoration function
(1) Execute "Restore" by backup/restoration function.
For details, refer to "8 Appx.2: Data Backup and Restoration".
(2) Turn the NC OFF and ON.
Note
(1) Restoration with the GOT's backup/restoration function restores the linear axis, but not the rotary axis. An initialization
of the absolute position of the rotary axis must be performed.
The same restoration as the backup/restoration function can be performed by writing the parameter (ALL.PRM).
Status at restore
Linear axis
Rotary axis
CAUTION
It is dangerous to restore the backup data of other machine when the absolute position is established because the
zero point will be established with the absolute position of the linear axis rewritten, thus the zero point position is
off the right position. Initialize the zero point again.
Absolute position established
Status will not change.
Absolute position internal data will be
updated.
Status will not change.
Absolute position internal data will not be updated.
101
Absolute position not established,
SRAM clear
Absolute position will be established.
Absolute position internal data will be
updated.
IB-1501454-C