HEIDENHAIN SW 68894x-02 - Manual (Page 73)

HEIDENHAIN CNC PILOT 640 73
3.2
S
w
itc
h
-on
/
S
w
itc
h
-of
f
3.2 Switch-on / Switch-off
Switch-on
The CNC PILOT displays the startup status. When the system has
completed all tests and initializations, it switches to the Machine
mode of operation. The tool display shows the tool that was last used.
If errors are encountered during system start, the control displays the
error symbol on the screen. You can check these error messages as
soon as the system is ready (see "The error messages" on page 60).
Monitoring EnDat encoders
If EnDat encoders are used, the control saves the axis positions during
switch-off of the machine. During switch-on, the CNC PILOT
compares for each axis the position during switch-on with the position
saved during switch-off.
If there is a difference, one of the following messages appears:
 "S-RAM error: Saved position of the axis is invalid."
This message is correct if the control has been switched on for the
first time, or if the encoder or other control components involved
were exchanged.
 "Axis was moved after power-off. Position difference: xx mm or
degrees"
Check the current position and confirm it if the axis was in fact
moved.
 "HW parameter changed: Saved position of the axis is invalid."
This message is correct if configuration parameters were changed.
The cause for one of the above listed messages can also be a defect
in the encoder or control. Please contact your machine supplier if the
problem recurs.
After system start, the CNC PILOT assumes that the tool
which was last used is still inserted in the tool holder. If
this is not the case, you must inform the control of the tool
change.