Nc-Controlled Reactions To Stoppage; Generator Operation/Dc Link Backup - Siemens SINUMERIK 840D sl Programming Manual

Additional functions
13.7 Extended stop and retract
13.7.3

NC-controlled reactions to stoppage

Function
Stop
The sequence for extended stop (NC-controlled) is specified in the following machine data:
MD 21380: ESR_DELAY_TIME1 and
MD 21381: ESR_DELAY_TIME2.
This axis continues interpolating as programmed for the time duration set in MD 21380. After
the time delay specified in MD 21380 has lapsed, controlled braking is initiated by
interpolation. The maximum time available for the interpolatory controlled braking is specified
in MD 21381; after this time has lapsed, rapid deceleration with subsequent correction is
initiated.
Enable and start NC-controlled stop
The NC-controlled stop is
configured: via MD 37500: 22 and 2 times using the two MD, see above;
enabled ($AA_ESR_ENABLE) and
started: System variable $AC_ESR_TRIGGER with $AA_ESR_TRIGGER for single axes.
Example of stopping a single axis:
MD 37500: ESR_REACTION[AX1] = 22
MD 21380: ESR_DELAY_TIME1[AX1] = 0.3
MD 21381: ESR_DELAY_TIME2[AX1] = 0.06
...
$AA_ESR_ENABLE[AX1] = 1
$AA_ESR_TRIGGER[AX1] = 1
13.7.4

Generator operation/DC link backup

Function
By configuring drive MD and carrying out the required programming via static synchronized
actions ($AA_ESR_ENABLE), temporary DC link voltage drops can be compensated. The
time that can be bridged depends on how much energy the generator that is used as DC link
backup has stored, as well as how much energy is required to maintain the active
movements (DC link backup and monitoring for generator speed limit).
When the value falls below the DC link voltage lower limit, the axis/spindle concerned
switches from position or speed-controlled operation to generator operation. By braking the
drive (default speed setpoint = 0), regenerative feedback to the DC link takes place.
For more information, see
/FB3/ Function Manual Special Functions; Coupled Axes and ESR (M3).
13-38
;NC-controlled stop
;Stopping starts here.
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
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