Siemens SINUMERIK 880 SW 6 Planning Manual page 243

01.93
Example of how velocity changes when the link is switched:
Set speed
following axis
V
max
V
K
Üb
V
K
Üa
Switchover point
from K to K
üa üb
SYNCHRONISM
FINE
Note:
The following notes apply to GA2, software version 1.
• During the acceleration phase the following axis follows the leading axis with maximum
acceleration until the two axes are running with synchronous speed for the first time. The
increments that cannot be output are lost.
• If acceleration limitation is deselected, the leading axes and following axis run only with
synchronous speed and no longer with positional synchronism after acceleration pro-
cesses. The positional differences added up during the acceleration are incorporated in the
synchronism error.
• If the alarm "FA x velocity limitation" is output, the resulting position difference is stored
and travelled when the speed of the leading axis allows it. This position difference is
deleted on an emergency off but not on a key reset. This means that on a key reset the
leading axis is stopped but the following axis continues to move until the position
difference has been eliminated.
_______
c) up to and including software version 6
©
Siemens AG 1991 All Rights Reserved
SINUMERIK 880 (PJ)
Path with ACCELERATION
LIMITATION SYNCHRONOUS
ACTIVE = 1 signal
Path with ACCELERATION
LIMITATION SYNCHRONOUS
ACTIVE = 0 signal
Max. permitted
acceleration
of the FA
FA reaches new FA reaches new
synchronous speed synchronized position
6ZB5 410-0HE02
7 ELG-Specific Signals (DB 29)
7.3 Signals to ELG (DB 29)
c)
t
7
–
15