Service Manual TNC 407 / TNC 415 - heidenhain - DR. JOHANNES ...

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HEIDENHAIN
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11. Encoders
11.1 Error Messages
Y= A: Signal amplitude too low
B: Frequency exceeded
C: Wrong reference mark spacing
x= CPU number 1 = Main processor
2 = Geometry processor
3 = CLP processor
11.2 Error Causes
Glass scale contaminated or defective
Scanning head contaminated or defective
Cable damaged
- Encoder input of the logic unit ILE) defective
11.3 Checking the Encoders
SERVICE MANUAL TNC 407/415
Issue: 01.09.1995
Page 49
In order to determine whether the encoder or the encoder input of the logic unit is defective, the encoders can
be switched at the logic unit For this purpose, the corresponding machine parameters must be altered as well.
Allocation of the axes
to the encoder inputs
X 110.0 o= Xl
Y 110.1 I= x2
Z 110.2 2= x3
IV 110.3 3= x4
V 110.4 4= x5
5= X6*
* X6 may only be used for a machine tool axis, if no spindle orientation is required.
Proceeding if an error message is displayed
- Switch off main switch.
Switch encoder X-axis with e.g. encoder Y-axis at the logic unit.
Switch on main switch.
If the error message POWER INTERRUPTED is generated, call the machine parameters with the code
number 95148 and switch the entry values of the machine parameters 110.0 and 110.1.
Exit the machine parameters and switch on the machine as usual.
If the same error message POWER INTERRUPTED is generated again, the error is located in the encoder or
in the extension cable. If the error message now says “Y” instead of “x”, the encoder input of the logic unit is
defective.
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