05.05 Start-Up
SIEMENS AG 6RX1700-0AD76 7-19
SIMOREG DC Master Operating Instructions
Calculation of armature circuit resistance P110 from measured armature current and
armature voltage values
− Increase the main setpoint (displayed at r001) slowly until the actual armature current
value (r019 in % of rated converter armature current) reaches approximately 70% of the
rated motor armature current.
− Read out r019 (actual armature current value) and convert to amps (using P100)
− Read out r038 (actual armature voltage in volts)
− Calculate the armature circuit resistance:
amps)to(converted r019
r038
[W]R
A =
− Set the armature circuit resistance in parameter P110
Calculation of armature circuit inductance P111 from measured armature current at
transition from discontinuous to continuous current
− Make an oscilloscope trace of the armature current (e.g. at terminal 12)
Increase the main setpoint (displayed at r001) slowly starting from 0 until the armature
current reaches the transition from discontinuous to continuous current.
− Measure armature current at transition (at standstill EMF=0) I
LG, EMF=0
or read out the
value of r019 and convert to amps using P100.
− Measure the phase-to-phase voltage of the armature power section U
supply
or read out
the value of r015.
− Calculate the armature circuit inductance using the following formula:
[A]I
[V]U0.4
[mH]L
EMFLG,
supply
A
=
∗
=
− Set the armature circuit inductance in parameter P111.
7.6.2 Manual setting of field circuit resistance R
F
(P112)
• Rough estimation of field circuit resistance R
F
(P112) from motor rated field data
(P102) current field motor Rated
voltage field motor Rated
R
F =
• Adapt the field circuit resistance R
F
(P112) using a field current setpoint/actual value
comparison
− Set parameter P112=0 to produce a 180° field precontrol output, and thus an actual field
current value = 0
− Set parameter P082=3 to ensure that the field remains permanently energized, even when
the line contactor has dropped out
− Set parameters P254=0 and P264=0, i.e. only field precontrol active and field current
controller disabled
− Set parameter P102 to the rated field current
− Increase parameter P112 until the actual field current (r035 converted to amps be means of
r073.002) is equal to the required setpoint (P102).
− Reset parameter P082 to the plant operating value.
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