HEIDENHAIN TNC 407 (243 020) Technical Manual - Manual (Page 321)

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TNC 407/TNC 415/TNC 425 10 Electronic handwheel 01.98
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10 Electronic handwheel
The following handwheels can be connected to the HEIDENHAIN control systems:
- one integral handwheel HR 130, or
- one portable handwheel HR 330, or
- one portable handwheel HR 332, or
- up to three integral handwheels HR 150 using handwheel adapter HRA 110 (see also chapter
"Mounting and Electrical Installation"). The operation of the electronic handwheel is described in the
User's Manual.
Machine parameter MP7640 defines which handwheel is connected to the control. If a value greater
than zero is entered but no handwheel is connected, the error message "Handwheel?" appears.
Shock and vibration can cause a slight movement of the handwheel and thus lead to an unwanted
traverse movement. In order to avoid this a threshold sensitivity for the electronic handwheel is
entered in machine parameter MP7660.
Traversing with the handwheel is disabled by setting marker M2826, i.e. handwheel pulses are
suppressed.
A interpolation factor can be selected in the "Handwheel" operating mode. This interpolation factor
determines the traverse distance per turn. In order to ensure that the rapid traverse rate fixed by the
machine parameter MP1010.x is not exceeded the NC determines the minimum entry value for the
interpolation factor. The NC control goes by the smallest value which was entered, i.e. according to
the slowest axis.
MP7641 defines whether the interpolation factor can be entered direct at the TNC control panel or
via PLC module 9036 (see also Chapter 7, section "PLC Modules").
Interpolation factor Traverse distance per turn
[mm] Effective from rapid traverse rate:
MP1010.x [mm/min.]
0 20 12 000
1 10 6 000
2 5 3 000
3 2.5 1 500
4 1.25 750
5 0.625 80
6 0.312 80
7 0.156 80
8 0.078 80
9 0.039 80
10 0.019 80
Machine parameter MP7670 can be used to select a higher limit than that calculated by the NC.
Initializing parameters for the handwheel are defined in machine parameters MP7645.x. These
initializing parameters are currently only evaluated by HR 332 and HRA 110. The functions are
described in the corresponding sections.