Loss And Restoration Of Absolute Position Data - Mitsubishi Electric C80 Series Connection And Set Up Manual

C80 Series Connection and Setup Manual
11 CNC CPU Initial Setup

11.1.1 Loss and Restoration of Absolute Position Data

(1) Loss 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.
- NC: SRAM clear
- Failure in NC absolute position data
- Servo drive: low battery or uninstallation of the battery
- Servo drive: disconnection of detector cable
The absolute position data can be restored by Backup/Restore or SRAM data.
(2) Restoration by Backup/Restore
- Execute "Restore" with Backup/Restore.
- Turn the NC power OFF and ON.
Restoration with the GOT's Backup/Restore 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/Restore 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
151
Absolute position not established,
SRAM clear
- Absolute position will be established
- Absolute position internal data will be
updated
IB-1501452-C