HEIDENHAIN TNC 306 Technical Manual - Manual (Page 497)

1-2 TNC 406/TNC 306 3/98
• New possibilities for infeed in free run
If the voltage of the analog input (W392) lies above the value from W520 (if W520 > 0), the
electrode moves into the workpiece at the free-run feed rate from MP2141.
• Change in MP2081
With MP2081 = 2 you can transfer the comparison of the actual gap with the nominal gap (from
W524) out of the generator and into the control. This is the same procedure as when MP 2081 =
1 except that, instead of using the subsequent two-point controller, it uses the characteristic
curve. The feed rate for the control is calculated from the characteristic curve.
To transfer the comparison function to the control, make the following change in the PLC
program:
The gap nominal value for ”good” in the PLC must be read from the corresponding parameter
(GV) of the current generator setting, calculated to 0...500, and loaded to W524. The threshold
for the free-run feed rate must be loaded to W520.
e.g.
L B671
;GV nominal Gap Voltage (from erosion parameter)
X K+5
= W524
;5..495 (=nominal Gap)
L K+450 ;for example 4.5
= W520 ;= threshold for free-run feed rate (0...500)
• The complete input curve for MP2081=0 or 2 can now also be changed from the PLC. Before the
PLC run, the PLC words 599 ... 597 are always loaded from the machine parameters MP2010 ...
MP2030. If you change the curve, you must also change the values in W588 ... B597 in the PLC.
After the PLC scan, the control uses these values for the characteristic curve.
The exact assignment is:
Rising characteristic curve before the kink point in thousandths
0.1 ... 10.0 ==> 100 ... 10000 in thousandths
W588 for positive feed rate
(MP2010.0)
W590 for negative feed rate (MP2010.1)
Characteristic curve after kink point: Multiplication factor
0.1 ... 10.0 ==> 100 ... 10000 in thousandths
W592 positive
(MP2020.0)
W594 negative (MP2020.1)
Kink as a percentage of the characteristic curve
0 ... 100%
B596 positive
(MP2030.0)
B597 negative (MP2030.1)
• New bytes and words
B396 MOD from Cycle 17 disk (0..7)
B397 Axis from Cycle 17 disk 0/1/2 = X/Y/Z
W398 Actual feed rate
• It is now possible to input MOD via Q parameters in Cycle 17 Disk.
• The status window also displays the values of feed rate and angular position when running the
disk cycle. If the control is set to inch values, the feed rate is shown in tenths of an inch.