Parameter Settings For Clearance Control - Siemens SINUMERIK 840D sl Function Manual

15.5.5

Parameter settings for clearance control

The part program name
The following machine data must be parameterized for the declaration of the function-specific
part program name CLC_GAIN and CLC_VOFF:
● MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[0] = "OMA1" (list of re-configured
NC codes)
● MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[1] = "CLC_GAIN"
● MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[2] = "OMA2"
● MD10712 $MN_NC_USER_CODE_CONF_NAME_TAB[3] = "CLC_VOFF"
1D/ 3D clearance control
The following machine data is used to select 1D or 3D clearance control:
● MD62500 $MC_CLC_AXNO = <n> (axis assignment for clearance control)
– <n> > 0: 1D clearance control where <n> = axis number of the clearance-controlled
– <n> = -1: 1. 5-axis transformation configured in channel
– <n> = -2: 2. 5-axis transformation configured in channel
Input signals
The clearance sensor input signals parameterized above are made known to the clearance
control function with the following machine data (see also Section "Parameter settings for input
signals (840D sl) (Page 574)"):
● MD62502 $MN_CLC_ANALOG_IN = <n> (analog input for the clearance control)
<n= input number, analog to the addressing of the system variables $A_INA[<n>]
● MD62504 $MN_CLC_SENSOR_TOUCHED_INPUT = <n> (assignment of an input bit for
the "sensor collision" signal)
<n= input number, analog to the addressing of the system variables $A_IN[<n>]
Exact stop
In order to be able to meet a programmed "Exact stop coarse/fine reached" block change
condition (G601/G602), the traversing velocity induced by the clearance control function in the
clearance-controlled axes must be lower than the standstill velocity tolerance at least for the
duration of the standstill delay time.
The following machine data must be modified to optimize the block change time:
● MD36000 $MA_STOP_LIMIT_COARSE[<x>] (exact stop coarse)
● MD36010 $MA_STOP_LIMIT_FINE[<x>] (exact stop fine)
● MD36020 $MA_POSITIONING_TIME[<x>] (delay time exact stop fine)
Special functions
Function Manual, 01/2015, 6FC5397-2BP40-5BA2
channel axis
TE1: Clearance control - 840D sl only
15.5 Startup
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