HEIDENHAIN iTNC 530 HSCI - Associated Files; Files for Machining

July 2013 8.1 Display and operation 1225
 FN17 – ID 622 IDX 6.0
The function FN 17: SYSWRITE ID 622 NR<> IDX 6.0 is used to activate
spindle load monitoring independently of the cut in order to detect cutter
breakage. The monitoring limit is specified in percent with respect to the
rated power of the spindle. If the value exceeds or falls below the
monitoring limit, an NC stop is triggered.
A filter constant must be specified in parameter NR<> in order to avoid an NC
stop when the tool leaves the material. Only abrupt changes in spindle
power that are typical of tool breakage may be evaluated. The filter constant
can be between 1 and 60 ms. If a constant of 0 is entered, the default value
10 ms will be used.
The values for the filter constant and the tolerance limit must be determined
for each individual application. Example:
Filter constant of 15 ms, tolerance limit for cutter breakage at 10% of the
rated power output of the spindle:
FN 17:SYSWRITE ID 622 NR15 IDX 6.0 = 10
The PLC can read in word W350 why the NC stop was triggered:
• (W350 = 1 or 2:
NC stop due to falling below the permissible minimum power
• W350 = 3:
NC stop due to detected cutter breakage (FN17 function ID 622 IDX 6.0)
• W350 = 4:
NC stop because the spindle load was exceeded (FN17 function ID 622
IDX 5.0)
Associated files Files for machining
The following requirements are mandatory for controlling to be activated:
 An NC program must have been selected (<name>.H).
 The column AFC must be enabled in the tool table via MP7266.40.
 If you are working with a <name>.CDT cutting table, then you must create an
AFC column and enter any desired control strategy there. If an entry in the
cutting data table intersects with an entry in the tool table, the entry in the
cutting data table has priority.
 M-function macro files M3.H, M4.H, M5.H (and possibly more).
 MFUNCT.TAB macro definition.
Note
Due to the difficult conditions surrounding setting the values for FN 17:
SYSWRITE ID 622 NR<> IDX 6.0, you should only use this function after
consultation with HEIDENHAIN.