Operation Manual

HEIDENHAIN CNC PILOT 640 75

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” auf Seite 62).

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.