Siemens SINAMICS Series Operating Instructions Manual page 591

Aside from this, speed-dependent current limitation must be activated by setting p50109 to 1.
NOTICE
Excessive stress on the commutator and brushes due to incorrect setting
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.
Setting speed-dependent current limitation for motors with a bend in the commutation
characteristic
The current limitation curve is determined using n1, I10, n2, and I20.
Parameter:
p50104
p50105
p50106
p50107
p50108
p50109
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A
= n1
= I1 (unit calculates I10 from this)
= n2
= I2 (unit calculates I20 from this)
= n3 (defines the speed scaling)
= 0 ... Speed-dependent current limitation switched off
= 1 ... Speed-dependent current limitation switched on
10.22 Speed-dependent current limitation
☐ = Motor rating plate
● = Permissible limit values
nE = Start of the speed-dependent current limiting
= Maximum operating speed
I10 = 1.4 × I1
I20 = 1.2 × I2
Descriptions of functions
589