Error Diagnosis On Tt Touch Probes - HEIDENHAIN iTNC 530 Service Manual

25.4 Error Diagnosis on TT Touch Probes

If you suspect that a damaged touch probe or a touch probe into which liquid has penetrated
Control impaired?
impairs the function of the control:
Visual inspection
Are the touch probe or the cable damaged?
Two red LEDs (offset by 180°) on the TT 140 indicate that the stylus is deflected:
Checking the LEDs
In the TT the Ready signal is bridged.
Checking the
This means that the Ready signal must always be present if a TT probe is connected.
"Ready" bridge
Proceed as follows to check the Ready bridge:
Assignment at the interface X13 (D-SUB, 9-pin, 2-row):
MC 42x(B)
Female
1
2
3
4
5
6
7
8
9
–
Hsg.
25 – 422
Disconnect the touch probe and observe the reaction. --> See "Deselecting and
Disconnecting the Touch Probe" on page 25 – 426.
Visually inspect the touch probe and cable!
Shut down the control and switch off the machine.
Disconnect the keypad cable on connector X13 from the MC.
Use a multimeter which you set to "beep" mode or to ohm measurement.
Apply the needle tips to the pins 1 and 4 of the touch probe cable. --> A beep must be heard
or a low ohmic value displayed.
Assignment X13 (TT)
Readiness
0 V (U
Do not assign
+15 V ±5% (U
Do not assign
Do not assign
+5 V ±5% (U
Trigger signal
Trigger signal
–
External shield
)
N
)
P
)
P
HEIDENHAIN Service Manual iTNC 530