Siemens SINUMERIK 840C - Manual (Page 962)

09.95 12 Functional Descriptions
12.19.4 Temperature compensation TC
12.19.4 Temperature compensation TC
The TEMPERATURE COMPENSATION (TC) function
is available as an option.
With this compensation function, the compensation values applying to the current temperature
are transferred from the PLC to the NC via the command channel. The requisite compensation
values must have been calculated in the PLC beforehand by the machine manufacturer.
12.19.4.1 Types of influence
There are two different types of temperature influence:
Position-dependent influence on actual value
The temperature-related actual-value deviation for an axis can be represented by an error
curve. It can be assumed that the position-dependent expansion develops evenly from one
reference point. It can be approximated by means of a straight line of which the gradient is
determined by the temperature.
Reference
point
-x +x
Error
(comp. value)
Error curve
ß
Position-independent influence on actual value
The measured axis actual value deviates by an absolute temperature-dependent value which is
not dependent upon the actual axis position. The characteristic of this error curve can likewise
be approximated by a straight line.
-x
+x
Reference
point
Error
(comp. value)
Error curve
Absolute compensation value
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SINUMERIK 840C (IA)