Siemens SINAMICS DCM Operating Instructions Manual page 524

Descriptions of functions
10.10 Switch on, switch off, enable
"Switch on/Shutdown" overview
p50087 Brake-release time (positive in this case)
p50088 Brake-closing time
p50258 Wait time for automatic field-current reduction
Figure 10-58 Switch on/Shutdown
● 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.
● Whether level triggering or edge triggering is selected has an overarching effect on
"Switch on", "Switch off", and "Creep".
Note
The "Creep' function is described in the "Creep (Page 532)" chapter.
● Selecting edge triggering causes "Switch on" and "Creep" to replace one another, i.e.:
– A "Switch on" edge at terminal X177.12 cancels a "Creep" function that had previously
– A "Creep" edge at a binector selected using p50440 cancels a "Switch on" function
● With edge triggering, an automatic restart following a brief interruption in the electronic
power supply voltage is not possible.
● To ensure that "Shutdown" 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 "Shutdown" is applied.
– All torque limits are disabled during braking to n < nmin.
– Of the current limits, only the system current limit (p50171 and p50172), speed-
522
been triggered.
that had previously been triggered.
dependent current limit, and current limit resulting from I
are enabled.
t monitoring of the power unit
2
SINAMICS DCM Control Module
Operating Instructions, 12/2018, A5E34888669A