Speed-Dependent Current Limitation - Siemens SINAMICS DCM Operating Instructions Manual
Control module for variable-speed dc drives
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10.19
Speed-dependent current limitation
Speed-dependent current limitation protects the DC motor's commutator and brushes at high
speeds.
The settings required for this (p50104 to p50107) must be taken from the motor rating plate.
Additionally, the maximum operating speed of the motor (p50108) must be entered; this must
match the actual maximum operating speed.
The actual maximum operating speed is determined as follows:
● Using p2000 in cases where the actual speed value comes from an incremental encoder
● Using p50741 in cases where the actual speed value comes from an analog tachometer
● Using p50115 in the case of operation without a tachometer
Aside from this, speed-dependent current limitation must be activated by setting p50109 to 1.
CAUTION
Making an incorrect setting for speed-dependent current limitation can lead to excessive
stress on the commutator and brushes, which in turn results in a significantly reduced
service life for the brushes.
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619
Descriptions of functions
10.19 Speed-dependent current limitation
409
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