HEIDENHAIN TNC 407 (243 020) Service Manual - Manual (Page 90)

SERVICE MANUAL TNC
Issue:
01.09.1995
Page
74
16. Analog Outputs
16.1 Specifications
6 outputs:
Load capacity:
Voltage range:
Resolution
2, 3, 4, 5, and S Machine Parameters for the Analog Outputs
Analog Output MP Entry Value
mint 5 X 120.0 0 = output 1
Y 120.1 1 = output 2
120.2 2 = output 3
IV 120.3 3 = output 4
V 120.4 5 = output 5
TNC 407 TNC 415
14 bits 16 384 steps 16 bits 65 536 steps
Smallest step
=
16.2 Checking the Analog Outputs
Proportionally to the traversing speed, the control generates an analog
OV (axis standstill) to
(rapid traverse). The easiest way to determine this voltage is to connect the test adaptor directly to the logic
unit or to the connecting terminals of the servo-amplifier and to measure with a multimeter.
If however, the axis does not move due to a defect, and you want to test whether the error is inside or outside
the control, the following steps are recommended:
Switch off the main switch of the machine tool.
Connect the test adaptor to the connector X8 (nom. value output) of the LE and connect a multimeter to the
test adaptor sockets for the defective axis If no test adaptor is available, connect a multimeter directly to the
nominal value output of the servo-amplifier.
Switch on the main switch and the control voltage.
Switch the position display to LAG (servo
sec. 16.3).
Check or adjust the following machine parameters. (If you alter the machine parameters, note down the
original values and enter them again after finishing the test.)
MP Entry Function Original Value
Value
1720
100 Servo-lag monitoring EMERGENCY STOP
1140 Movement monitoring
Traverse the reference points that need to be traversed before those of the defective axis.
Turn the override potentiometer of the keyboard unit completely to the left and start reference point traverse
for the defective axis.
Check the axis enable for the defective axis at the servo amplifier.
Check the screen display
(control ready for operation) must be switched on, the of the feed display must be lit normally the
display is inverse, the feed enable is missing), and the symbol for “Axis not in the Position Loop” (e.g.
should not follow the position display.
Turn the override potentiometer slowly to the right and turn it back left before the servo lag display reaches
the limit of the position monitoring