HEIDENHAIN TNC 335 Technical Manual - Manual (Page 212)

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TNC 360 6 Display and Operation 4-115
6.3.3 Feed rate setting, feed rate display
In the operating modes "Program run, single block" and "Program run, full sequence" the pro-
grammed contour feed rate is displayed when the feed potentiometer is in the 100 % position. The
feed potentiometer can be used to vary this programmed feed rate from 0 to 150 %.
With the feed rate potentiometer the feed rate can be changed to 0% to 150% of the programmed
feed rate.
The override values are shown in the PLC in word W766 and W494. If the PLC program overwrites a
value in W766, it will become active regardless of the potentiometer setting. W766 must be
overwritten in every PLC scan, since otherwise the normal feed rate would become effective again.
The value range is 0 to 150 in 1% increments, for nonlinear curves it is 0 to 15 000, corresponding to
0 to 150%.
To adjust the override values for auxiliary axes (PLC axes) see PLC module 9124.
With the Doubleword D596 the PLC can limit the maximum possible feed rate by entering a feed
rate value. The new feed rate becomes effective immediately.
In order to ensure compatibility with previous PLC programs, the Doubleword D596 is give the
default value 300 000 mm/min when the control is switched on or after an interruption of the PLC
scan, so that the maximum feed rate from the machine parameter becomes effective. With
"Tapping" (Cycle 2) and "Rigid tapping" (Cycle 17), the Doubleword D596 has no effect.
In the manual operating modes the axis feed rate is displayed, not the contour feed rate. There is a
choice of two display modes:
– The axis-specific feed rate from machine parameter MP1020.X is only displayed after pressing
an axis-direction key. If two axis-direction keys are pressed simultaneously no feed rate will be
shown.
– Even when none of the axis-direction keys is operated one feed rate will be displayed, which
can also be adjusted by the feed potentiometer. The smallest feed rate from MP 1020.X is valid
for all axes. The axis feed rate will also be shown if several axis-direction keys are pressed
simultaneously.
MP7270 Display of the feed-rates in manual operating modes (Manual operation,
Electronic handwheel)
Input value: 0 or 1
0 = Display of the axis feed rate only when an axis-direction key is pressed
axis-specific feed from MP1020.x)
1 = Display of the axis feed rate before operating an axis-direction key
(smallest value from MP1020.x for all axes)