HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 212)

01.98
TNC 407/TNC 415/TNC 425 3 Servo positioning of the NC-axes 4-87
3.5.5 Standstill monitoring
The Standstill monitoring operates with feedforward control and with lag. The monitoring begins
when the axes have reached the positioning window. The range in which the axes may move is
defined in MP1110.
As soon as position deviation is greater than the value which is stored in MP1110, the flashing error
message "
GROSS POSITIONING ERROR D " is displayed. The message also appears if, on running-
in to a position, an overshoot occurs which is larger than the value in MP1110, or if the axis moves
in the opposite direction on beginning a positioning movement.
MP1110 Standstill monitoring
Entry: 0.0010 to 30.0000 (mm)
MP1110.0 X axis
MP1110.1 Y axis
MP1110.2 Z axis
MP1110.3 4th axis
MP1110.4 5th axis
3.5.6 Positioning window
The positioning window defines the limits within which the control considers that a position has
been reached. After reaching the position the control starts the execution of the next block. The size
of the positioning window is defined in machine parameter MP1030.
During feedforward control the positioning window is not evaluated until the velocity falls below the
value in MP1525
* . This MP does not exist on old software versions, in which the maximum velocity
for positioning window evaluation is fixed at 0.5 mm/min.
If the value which is entered is too small, the run-in time and therefore the time between one
program block and the next will be lengthened.
If the axes have reached the positioning window after a movement, the markers M2008 to M2011
and M2017 are set (see section "Axis in position").
MP1030
MP1030.0
Positioning window
Entry: 0.0001 to 2.0000 (mm)
X axis
MP1030.1 Y axis
MP1030.2 Z axis
MP1030.3 4th axis
MP1030.4 5th axis
MP1525 Maximum velocity for checking the positioning window
Entry: 0.100 to 10.000 [mm/min]
Recommended value: 0.5 [mm/min]
*
As of software versions 280 54x 02, 280 56x 02 and 280 58x 02