Starting Up Clearance Control - Siemens SINUMERIK 840D sl Function Manual

TE1: Clearance control
11.5 Startup
11.5.7

Starting up clearance control

Clearance sensor
The clearance sensor outputs should be connected to the I/O modules that were activated
using the following machine data:
• MD10362 $MN_HW_ASSIGN_ANA_FASTIN (I/O address of the I/O module) (hardware
assignment for the fast analog NCK inputs)
• MD10366 $MN_HW_ASSIGN_DIG_FASTIN (I/O address of the I/O module) (hardware
assignment for the external digital NCK inputs)
Also see Chapter "I/O modules [Page 498]".
Test control direction
Proceed as follows to test the control direction of the clearance control function:
• Activate the clearance control via a part program using CLC(1) (see Chapter "Activating
and deactivating clearance control (CLC) [Page 479]")
• Generate an input voltage, e.g. via the following synchronized action:
N100
N110
N120
N130
Figure 11-10 Output voltage for synchronized action
The voltage specification for the analog output $A_OUTA[6] used in the synchronized action
is subtracted from the clearance sensor input voltage by the clearance control function and
therefore has the opposite polarity to the input signal.
Set the following machine data to induce the clearance control function to use analog output 6
($A_OUTA[6]) as an additional input overlaid on the sensor input:
476
$AC_TIMER[1]=2.5
ID = 1 EVERY $AC_TIMER[1] >= 2.5 DO $AC__TIMER[1]=0
ID = 2 WHENEVER $AC_TIMER[1] < 2.0 DO $A_OUTA[6] = 100000.0 *
($AC_TIMER[1] - 1.0)
ID = 3 WHENEVER $AC_TIMER[1] >= 2.0 DO $A_OUTA[6] = 0.0
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
Special Functions