HEIDENHAIN TNC 415 (259 9x0) Service Manual - Manual (Page 125)

SERVICE MANUAL TNC 415B/425
Page 120
Issue: 20.08.95
18. Analogue Outputs
18.1 Specifications
6 outputs 1, 2, 3, 4, 5 and S Machine parameters for the analogue outputs
Analogue outputs
MP Entry values
Load capacity: R
Lmin
> 5 k
Ω
C
Lmax
< 2 nF
Voltage range: U
amax
=
±
10V
±
100 mV
U
amin
= 0V
±
3 mV
X
Y
Z
IV
V
120.0
120.1
120.2
120.3
120.4 0 = output 1
1 = output 2
2 = output 3
3 = output 4
4 = output 5
5 = output S
Resolution: 16 Bit = 65 536 steps
Smallest step 10 V
65 536
= 0.153 mV
18.2 Checking the Analogue Outputs
18.2.1 Axes with Analogue Speed Controller
Proportionally to the traversing speed, the control generates an analogue voltage of 0V to 9V (rapid traverse).
The easiest way to determine this voltage is to connect the test adapter directly to the logic unit or to the
connecting terminals of the servo-amplifiers 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 at the machine tool.
- Connect the test adapter to the connector X8 (nominal value output) of the LE and connect a multimeter to
the test adapter sockets for the defective axis. If no test adapter 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 lag) (see section 18.3).
- Check and adjust the following machine parameters:
(If you alter a machine parameter, note down the original value and enter it again after finishing the test.)
MP Entry Value Function Original Value
1410.X 30
[
mm
] Servo-lag monitoring (erasable), feed forward
1420.X 30
[
mm
] Servo-lag monitoring (EMERG. STOP),
feed forward
1140.X 9.99
[
V
] Movement monitoring
1710.X 300
[
mm
] Servo lag monitoring (erasable), trailing mode
1720.X 300
[
mm
]
Servo lag monitoring (EMERG. STOP),
trailing mode
- 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 mark
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 ON, the F of the feed rate display must be normally lit (if the display
is inverse, the feed rate enable is missing), and the symbol for "Axis not in the position loop" (e.g.
→|←
X)
should not follow the position display.
- Turn the override potentiometer slowly to the right and turn it back left again before the servo lag display
reaches the limit of the position monitoring.