Siemens SINAMICS DCM Manual page 515

Descriptions of functions
10.9 Switch on, switch off, enable
● 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-
10.9.4 Operation enable (enable) - control word bit 3
The enable signal is HIGH active (log. "1" state = enable).
Control word bit 3 and terminal X177.13 (enable) are logically ANDed. See also function
diagram 2580.
Procedure for applying operation enable (if a switch-on command is present):
1. With positive brake-release time (p50087):
The "Release holding or operational brake" signal (r53210.0 = 0) is output and p50087 is
awaited in operating state o1.0.
With negative brake-opening time (p50087 negative):
Go immediately to step 2; brake is still closed (r53210.0 = 1)
2. The ramp-function generator, n controller, and I controller are enabled.
3. Operating state o0 is reached.
4. Once a negative brake-release time (p50087) has elapsed, the "Release holding or
operational brake" (r53210.0 = 0) signal is output.
Procedure for withdrawing operation enable:
1. The ramp-function generator, n controller, and I controller are disabled.
2. Reduction in armature current
3. The armature firing pulses are disabled.
4. The "Close operational brake" signal is output (r53210.0 = 1, where p50080 = 2).
5. Operating state o1.0 or higher is reached.
6. The drive coasts down (or is decelerated by the operational brake).
7. Once n < nmin (p50370, p50371), the "Close holding brake" signal is output (r53210.0 =
1, where p50080 = 1).
516
dependent current limit, and current limit resulting from I2t monitoring of the power unit
are enabled.
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SINAMICS DCM DC Converter
Operating Instructions, 02.2015, A5E34763375/RS-AA/001