NC Commissioning with HMI Advanced
11.5 Axes and spindles
Manual
436 Commissioning Manual, 05/2008, 6FC5397–4CP10–4BA0
Properties of phase 2:
● The feedrate override (feedrate switch) is active.
● The feed stop (channelspecific and axisspecific) is active.
● The machine axis can be stopped and restarted with NC-stop/NC-start.
Determining the absolute offset
To determine the absolute offset between the measuring system zero point and the machine
zero, the following procedure is recommended:
1. Determining the actual position of the measuring system
After two reference marks following one after the other (synchronized) have been
overtraveled, the actual position of the length measuring system can be read on the user
interface at "Actual position".
The absolute offset must be zero at this time:
– MD34090 $MA_REFP_MOVE_DIST_CORR = 0
2. Determine the absolute machine actual position
Determining the absolute machine actual position, e.g. can be performed by traversing
the machine axis to a known position (fixed stop) or measured at a convenient position
(laser interferometer).
3. Calculating the absolute offset
– Linear measurement system non-inverse to machine system:
Absolute offset = machine actual position + actual position of the measuring system
– Linear measuring system inverse to machine system:
Absolute offset = machine actual position - actual position of the measuring system
– MD34090 $MA_REFP_MOVE_DIST_CORR (reference point/absolute offset)
WARNING
The position measuring system must be referenced again after determining the
absolute offset and making the entry in the following machine data:
MD34090 $MA_REFP_MOVE_DIST_CORR (absolute offset)
References:
/FB1/ Function Manual - Basic Functions, R1 Reference point approach, Chapter
"Referencing on length measuring systems with distance-coded reference marks"
Absolute encoders
Initial referencing of the measuring system of a machine axis with absolute encoder is
performed by calibrating the encoder.
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