HEIDENHAIN MANUALPLUS 620 - Page 845

January 2012 6.16 The Control Loop 845
Rapid traverse and
feed rate limitation
If more than one axis is moved simultaneously, the rapid traverse on the path
v
path
is formed from the appropriate axis components (see "Axis-specific limit
values" on page 831).
 In MP_maxFeed, define the maximum rapid traverse for this axis.
Feed rate and rapid traverse are significantly lower for Manual Operation:
 Define the feed rate for manual mode in MP_manualFeed.
 Define the feed rate for rapid traverse in MP_rapidFeed.
If the value in PP_ChnContourFeedMax is greater than the value in
MP_maxFeed, the parameter value applies. After the MANUALplus 620 is
switched on, or after an interruption of the PLC program,
PP_ChnContourFeedMax is assigned the value 300 000 so that the value in
MP_maxFeed automatically becomes effective.
The maximum possible feed rate depends on the encoder being used.
v
max
[mm/min] = P [mm] · f
i
[kHz] · 60
v
max
= Maximum traversing speed
P = Signal period of the encoder
f
i
= Input frequency of the encoder input, see "Encoder Connections" on page
242.
Digital axes:
For digital axes, the maximum feed rate also depends on the number of pole
pairs in the drive motor and the pitch of the ball screw.
Analog axes:
The rapid traverse rate at an analog voltage of 9 V is defined in
MP_maxFeedAt9V.
v
axis 2
v
axis 1
v
path
Note
The absolute maximum velocity of this axis is defined in MP_maxFeed.
This value is not exceeded.
v
max
[mm/min]
24 000
number of pole pairs
----------------------------------------------------------------- 1 / m i n[]ball screw pitch [mm]×=