Siemens SINUMERIK 840D sl Function Manual page 254

K3: Compensations
5.2 Temperature compensation
Activation
The following conditions must be fulfilled so that the temperature compensation can be
activated:
1. The compensation type is selected (MD32750, see "Commissioning (Page 255)").
2. The parameters for the compensation type are defined (see "Commissioning (Page 255)").
3. The axis is referenced:
DB31, ... DBX60.4 or 60.5 =1 (referenced/synchronized 1 or 2 respectivelly)
As soon as these conditions are fulfilled, the temperature compensation value for the position
actual value is added to the setpoint in all modes and the machine axis traverses through this
distance. If the compensation value ∆K
If the reference position is then lost, e.g. because the encoder frequency has been exceeded
(DB31, ... DBX60.4 or 60.5 = 0), compensation processing is deactivated.
Clock cycle
The compensation values are determined in the interpolator clock cycle.
Display
The total compensation value calculated from the temperature and sag compensation
functions belonging to the actual position is output in the "Diagnosis" operating area of the
"Axis/Spindle Service" window.
Parameter adaptation for temperature changes
Since the approximated error line applies only to the instantaneous temperature value, the
parameters of the error lines that are newly generated when the temperature rises or falls must
be sent to the NCK again. Only in this way can expansion due to heat always be correctly
compensated.
When temperature T changes, the parameters which are temperature-dependent, i.e. (K
tanβ and P
synchronized action.
It is thus possible for the machine-tool manufacturer to emulate the mathematical and
technological relationship between the axis positions and temperature values via the PLC user
program and thus calculate the various parameters for the temperature compensation. The
temperature parameters are transferred to the NCK using the variable services (FB2 (GET)
"Read data" and FB3 (PUT) "Write data").
For more information on handling and supplying FB2 and FB3 see:
Reference:
Function Manual Basic Functions; Basic PLC Program (P3)
254
) also change and can thus always be overwritten by the PLC or by means of a
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is positive, the axis moves in the negative direction.
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Function Manual, 10/2015, 6FC5397-1BP40-5BA3
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Extended Functions