July 2013 7.7 Special functions 1099
With the CC 61xx and the UEC 1xx, the LIFTOFF function can also be
performed if regenerative or non-regenerative UV power supply modules are
being used. In this case, the controller unit itself must measure the Uz dc-link
voltage. This results in the following voltage thresholds for LIFTOFF: If the DC-
link voltage falls below the threshold of 450 V, the spindle is decelerated to
feed energy into the DC-link. Until now the spindle was accelerated again once
the DC-link voltage exceeded the threshold of 450 V. Now the spindle is
decelerated until the DC-link voltage has risen above 500 V. Then the spindle
speed is maintained. This process can be repeated as often as necessary if the
DC-link voltage falls below the threshold of 450 V. At a voltage of 400 V the
initialization of LIFTOFF is reported to the MC and the spindle is retracted from
the workpiece, at a voltage of 350 V the spindle is decelerated systematically
in order to maintain the DC-link voltage, at a voltage of 300 V the powerfail
signal is set by the controller unit.
MP1160 LIFTOFF in case of power failure
Input: 0 to 30.0000 [mm]
Default: 0.1 [mm]
LIFTOFF only functions with HEIDENHAIN inverters.
Perform the LIFTOFF function on the machine to check whether the tool
lifts off the complete distance defined in MP1160 without problems.
Due to the dynamics of a machine, it may occur that the LIFTOFF (if values
> 10 mm are defined in MP1160) cannot be executed completely and is
aborted with an error message.
Limit-switch monitoring is not active during LIFTOFF.
LIFTOFF must be deactivated while exchanging tools.
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