Siemens SIMATIC FM 453, Руководство пользователя

Страница: 205 / 380

9-5
FM 453 Servo Drive / Step Drive Positioning Module
C79000-G7076-C453-01
Table 9-1 Control Signals, continued
Symbol
Function Name
English
Function Name
German
OVERRIDE OVERR Override
Note:
Time override has effect only in the MDI and Automatic modes.
Taking the override into account as a time override presupposes the
following additional condition:
If a traversing movement consists of multiple positioning blocks
with block change on-the-fly (the axis does not stop between blocks),
changing the override value affects only the speed. Acceleration
and deceleration are additionally affected only after the axis comes
to a stop (e.g. reversal of direction).
v
act
=
v
prog
Override
100
a
act
=
a Override
2
100
2
t
act
=
t 100
Override
– speed v is cut in half
– acceleration and deceleration are quartered
Positioning time is doubled.
Example: Cut override in half, from 100% to 50%
100 %
t
v
act
v
prog
50 %
v
S
Time override
If you parameterize the “time override” function in MD37, there are
two ranges:
– range 100-255%: speed override operates as described above
– range 0-100%: time override operative
Speed, acceleration and deceleration are changed in such a way that the
time necessary for the traversing movement is directly correlated with
the override value.
Note
For further functions, settings and commands concerning open-loop con-
trol, see Section 9.3.2 and Section 9.3.3.
Description of Functions