Siemens SINUMERIK Series Function Manual

K3: Compensations
4.2 Temperature compensation
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
227
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
0
,
tanβ and P
0
) also change and can thus always be overwritten by the PLC or by means of a
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)
Smooth the compensation value
To prevent overloading of the machine or tripping of monitoring functions in response to step
changes in the temperature compensation parameters, the compensation values are
distributed over several IPO cycles by an internal control function as soon as they exceed
the maximum compensation value specified for each IPO cycle (MD32760, see
"Commissioning (Page 227)").
4.2.2 Commissioning
Temperature-dependent parameters
Error curves for different temperatures can be defined for each axis. For each error curve the
following parameters must be determined and then entered in the setting data:
● Position-independent temperature compensation value K
0
:
SD43900 $SA_TEMP_COMP_ABS_VALUE
● Reference position P
0
for position-dependent temperature compensation:
SD43920 $SA_TEMP_COMP_REF_POSITION
● Gradient tanβ for position-dependent temperature compensation:
SD43910 $SA_TEMP_COMP_SLOPE

Siemens SINUMERIK Series Specifications

General

Axes Control	Up to 31 axes
Category	Control Unit
Manufacturer	Siemens
Series	SINUMERIK
Control Type	CNC
Communication Interfaces	Ethernet, USB
Operating Temperature	0°C to 45°C
Protection Class	IP20
Power Supply	24V DC
Display	Color TFT LCD