Descriptions of functions
10.10 Switch on, switch off, enable
SINAMICS DCM DC Converter
556 Operating Instructions, 12/2018, A5E34763375A
Procedure for withdrawing "Quick stop":
1. Remove "Quick stop" command.
2. Apply the "Shutdown" command (e.g. using the "Switch on/Shutdown" terminal).
3. The system exits operating state o8.
Brake-release time (positive in this case)
Wait time for automatic field-current reduction
Figure 10-59 OFF3 (quick stop)
● The "Quick stop" command only needs to be present as a short pulse (> 10 ms). It is then
saved internally. It is only possible to reset the memory by applying the "Shutdown"
command.
● The SINAMICS DC MASTER links all "Quick stop" commands in such a way that the
"Quick stop" function is only disabled once all commands are in the "No quick stop" state.
● An internal interlock becomes active once n < nmin (r50370, r50371) for the first time.
This stops the drive from attempting to decelerate again if the motor is rotated by external
influences; the n < nmin message then disappears.
● To ensure that "fast stopping" functions even when rewiring is carried out, current or
torque lower limits are specified, or additional setpoints are supplied, certain functions are
disabled automatically when "fast stopping" is applied.
– All torque limits are disabled while braking to n < nmin.
– Of the current limits, only the system current limit (p50171 and p50172), speed-
dependent current limit, and current limit resulting from I
2
t monitoring of the power unit
are enabled.
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