Offset Adjustment; Offset Adjustment By Code Number; Automatic Cyclical Offset Adjustment - HEIDENHAIN TNC 415 Technical Manual

3.3 Offset adjustment

The TNC 407/TNC 415 controls include several possibilities for compensating for an offset voltage
which would cause the axes to drift.
The maximum permissible offset-voltage in the control is 100 mV. If this voltage is reached or
exceeded, then the error message
"GROSS POSITIONING ERROR E <AXIS> #"
will appear.
The automatic cyclical offset-adjustment and the adjustment via integral factor must not be active
simultaneously!

3.3.1 Offset adjustment by code number

An automatic offset adjustment can be activated with the code number 75 368. After entering the
code number the control shows the offset values for the axes X, Y, Z, 4, 5 in the dialogue line. The
values indicate the voltage in 0.15 mV units. Thus a display of 10 means 10 x 0.15 mV = 1.5 mV. The
display 0 means no offset.
On pressing the ENT key or the CONTINUE soft key the offset values are automatically
compensated. The control puts out an appropriate compensating voltage. In the TNC 407
compensation only takes place if the offset voltage is > 0.6 mV. To switch off the automatic offset
adjustment, enter the code number and press the NO ENT key or the QUIT soft key. If the code
number has been entered but no changes are desired, press the END soft key.
The offset values are stored in the control and are non-volatile. If the control is exchanged, the code
number must be entered to reactivate the offset adjustment.

3.3.2 Automatic cyclical offset adjustment

The machine parameter MP1220 can be used to program a time interval, after which an offset
adjustment will be performed cyclically.
An automatic adjustment will be carried out, when the predetermined time has elapsed and the
following conditions are fulfilled:
- all axes are stopped,
- the spindle is not switched on,
- the axes are not clamped.
For each adjustment cycle there will be a 1 mV correction if the offset voltage is larger than 1 mV. If
the offset voltage is smaller than 1 mV then, in the TNC 415, compensation steps of 0.15 mV will be
used (in the TNC 407 in steps of 0.6 mV).
MP1220 Automatic cyclical offset adjustment
Entry: 0 to 65 536 [s]
0 = no automatic adjustment
01.98 TNC 407/TNC 415/TNC 425 3 Servo positioning of the NC-axes 4-77