HEIDENHAIN TNC 415 (259 9x0) Service Manual - Manual (Page 136)

SERVICE MANUAL TNC 415B/425
Page 131
Issue: 20.08.95
18.6.2 Trigger
The following possibilities are available:
•
FREE RUN Recording is terminated by hand.
•
SINGLE SHOT Recording of a memory contents; started by trigger condition
•
CHANNEL ... Recording starts when the trigger threshold of the selected channel is exceeded.
Trigger Threshold
The trigger threshold for the selected channel is indicated as a numerical value; the units are as follows:
•
feed rate (mm/min)
•
position (mm)
•
shaft speed (mm/min)
•
servo lag (µm)
•
analogue voltage (mV)
Edges
Triggering with rising (positive) and falling (negative) edge.
Pre-Trigger
Definition of recording start in % of the total recording time; possible entry values are 0%, 25%, 50%,
75%, 100%; selectable by pressing ENT.
18.6.3 Recording
The recording parameters to be edited are selected via arrow keys. The values for the feed rate threshold and
the trigger threshold are entered via the numerical keys. The entry values for all other recording parameters
are selected by pressing ENT.
Output
To output a nominal value in the MANUAL mode, it is possible to chose between a pre-set ramp and a jump
function. The jump function (only possible with digital controlled axes) is required for the adjustment of the
speed encoder. Moreover, if the preliminary entry value is unknown, the maximum acceleration can be
determined from jump function and recording with the oscilloscope. In MDI and AUTOMATIC the axes are
always accelerated following the selected ramp.
Feed Rate
If a jump function is selected as output signal, the feed rate is entered in mm/min. The programmed feed rate
is valid for the acceleration subsequent to the ramp.
Time Resolution
The recording time is between 2.4576 seconds and 24.576 seconds (selected time x 4096). The selected time
(0.6 ms to 6 ms) is the clock time for recording the characteristic lines. The recording time is displayed below
the grating. Beginning and end of display (relative to the trigger point; cursor line T1) are displayed as well.