K85, Field Reversal - Siemens SINAMICS DCM Betriebsanleitung

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11.5 Supplementary circuits
11.5.2

K85, field reversal

Category
Supplementary circuits
Function
Changes over the field circuit for the DC motor for braking and direction of rotation reversal
for two-quadrant units with rated DC currents of ≥ 400 A. The following additional data is
required in plain text:
1. Rated motor field current
2. Rated motor field voltage
3. Energy content or inductance of the field winding
4. Maximum switching frequency per hour
Connection
The connection is made at the standard terminals for the field output. For details, see the
operating instructions for the SINAMICS DCM Cabinet, Chapter Connecting the motor and
power cables (Page 81).
Commissioning
It should be checked as to whether the changeover can be made without the reversing
contactors arcing excessively. Otherwise, the wait time for field decay p50092[0] should be
extended.
Parameter assignment
Contrary to the operating instructions of the SINAMICS DCM DC Converter, the field
contactors should be controlled via digital outputs 1 and 2 (output 0 is used for the fan
control).
Set the value (63) r53195.0 at p50772.
Set the value (63) r53195.1 at p50773.
At p50580, p50581, p50092[0]...[3], set suitable values according to the function diagram -
6920- in the List Manual.
226
Operating Instructions, 04/2015, A5E36161239/RS-AA/001
SINAMICS DCM Cabinet