HEIDENHAIN TNC 335 Technical Manual - Manual (Page 263)

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TNC 360 10 Electronic Handwheel 8/95
10 Electronic Handwheel
Either a
– an panel-mounted handwheel (HR 130)
– an portable handwheel (HR 330 or HR 331)
– or up to three single-axis integral handwheels (HR 150) via handwheel adapter (HRA 110)
can be connected to HEIDENHAIN contouring controls (see also Chapter "Mounting and electrical
installation "). The operation of the electronic handwheel is described in the TNC 360 User's Manual.
MP7640 determines which handwheel is connected. If a value greater than zero is entered but no
handwheel is connected, the error message "HANDWHEEL?" will appear.
The counting direction for the measuring system signals of the handwheel are entered in machine
parameter MP7650.
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. Setting the Marker M2826 inhibits traverse with the
handwheel, i.e. handwheel pulses are suppressed.
For HR 130, HR 330, and HR 332 one interpolation factor can be selected in the "Handwheel"
operating mode. For HR 150 with HRA 110 up to three can be selected. This interpolation factor
determines the traverse distance per handwheel revolution. 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. For the HR 130, HR 330, and HR 332 handwheels,
the NC goes by the smallest value which was entered, i.e. according to the slowest axis.
Machine parameter MP7641 bit 0 defines whether the interpolation factor can be entered through
the TNC keyboard (see User's Manual) or through the PLC module 9036 (see Chapter 7, section
"PLC Modules"). With machine parameter MP7641 bit 2 the interpolation factor for the handwheel
can be defined both from the keyboard and from the PLC module 9036. If bit 2 = 0, the machine
parameters function as before (entry from the keyboard or from PLC module 9036).
If in machine parameter MP7641 bit 3 is set, the PLC can poll the keys (except for the axis keys) in
any mode of operation. This function takes effect before the REF run. The axis keys and the
handwheel pulses do not become effective until handwheel mode is active. After an error the
handwheel is not driven until the handwheel key is pressed.
In the "Programming and editing" mode of operation the axis can be moved by the handwheel if in
machine parameter MP7641 bit 1 = 1. The interpolation factor or the handwheel axis can be
changed only in the "Electronic handwheel" mode, regardless of the handwheel model. Once a
handwheel axis has be selected, it remains active even after a switch of operating modes.
Simultaneous use of the handwheel interface and the RS-232-C interface causes a conflict in baud
rates (38 400 and 19 200 baud) resulting in the error message BAUD RATE NOT POSSIBLE.
For the HR 150 with the HRA 110 handwheel adapter the control sets the interpolation factor
individually for up to three axes.
Interpolation factor Traverse distance per handwheel
revolution [mm] Effective from rapid traverse rate:
MP1010.x [mm/min.]
0 20 12 000
1 10 6 000
2 5 3 000