Siemens SINUMERIK 840Di Function Manual page 346

Detailed Description
2.1 General functionality
Determine torque limit status
The system variables $VA_TORQUE_AT_LIMIT can be used at any time to read in systems
with digital drives (FDD, MSD, HLA) whether the currently active torque corresponds to the
given torque limit.
0:
1:
Restrictions
The function FOC is subject to the following restrictions:
• The change of the torque/force limitation representing itself as an acceleration limitation
• Only FOC:
• If the acceleration limitation is not adapted accordingly, an increase of the drag distance
• If the acceleration limitation is not adapted accordingly, the end-of-block position is
Possible application link and container axes
All axes that can be traversed in a channel, i.e. also link axes and container axes, can be
traversed to fixed stop.
References:
/FB2/ Expansion functions; several control panels on multiple NCUs, decentralized systems
(B3)
The status of the machine axis is kept in the case of a container switch, i.e. a clamped
machine axis remains at the stop.
If a modal torque limitation has been activated with FOCON, this is kept for the machine axis
even after a container switch.
2-22
Effective torque less than torque limit value
Effective torque has reached the torque limit value
is only taken into account in the traversing movement at block limits (see command ACC).
No monitoring is possible from the VDI interface to check that the active torque limit has
been reached.
during the traversing motion occurs.
possibly reached later than specified in:
MD36040 STANDSTILL_DELAY_TIME.
The machine parameter:
MD36042 FOC_STANDSTILL_DELAY_TIME
is introduced for this and monitored in this status.
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0
Travel to Fixed Stop (F1)