Siemens SINUMERIK 840C User Manual
Page 320
09.95
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
6.6.2 Spindle-specific MD bits (spindle bits)
7
6
5
4
3
2
1
0
Bit No.
NC MD
530*
EMERG.
retraction
when
generator
speed
threshold
no met
1)
EMERG.
retraction
when DC
link voltage
warning
threshold
not met
1)
EMERG.
retraction
threshold
FA/FS
1)
Spindle-specific sources for retraction.
Bit 2 Bit 2=1 A retraction movement is triggered if the generator speed of an axis/spindle
falls below the minimum.
Bit 2=0 A retraction movement is not triggered if the generator speed of an
axis/spindle falls below the minimum.
Bit 1 Bit 1=1 A retraction movement is triggered if the DC link undervoltage of an
axis/spindle falls below the minimum.
Bit 1=0 A retraction movement is not triggered if the DC link undervoltage of an
axis/spindle falls below the minimum.
Bit 0 Bit 0=1 A retraction movement is triggered if the retraction threshold of an FA is
exceeded.
Bit 0=0 A retraction movement is not triggered if the retraction threshold of an FA is
exceeded.
Active:
At once
7
6
5
4
3
2
1
0
Bit No.
NC MD
531*
Time-
optimized
synchroniz-
ation (as
from SW 6)
Time-optimized tooth pitch synchronization can be set via bit 4. This means that the
synchronized position is approached by deceleration when the following spindle speed is
above half the maximum speed. Below this speed the synchronous position is approached
along the shortest path.
Note:
•
This bit is only active when MD 526*, bit 7,”Synchronization of tooth pitch” is also
active.
•
Gear wheels must not be in motion when this function is active.
Bit 4 Bit 4=1 The synchronization path of following axes is limited to 1 revolution/denomina-
tor of the GI link ratio to the leading spindle. Above half the maximum speed,
the synchronous position is reached by deceleration, below half the maximum
speed along the shortest path.
Bit 4=0 The synchronization path of following axes is limited to 1 revolution/denomina-
tor of the GI link ratio of the leading spindle. The synchronization position is
then always approached along the shortest path.
_______
1)
As from SW 4
©
Siemens AG 1992 All Rights Reserved 6FC5197- AA50
6–135
SINUMERIK 840C (IA)