Manual Optimization - Siemens SINAMICS Series Operating Instructions Manual

Commissioning

8.9 Manual optimization

8.9 Manual optimization
Manual optimization is best performed using the STARTER commissioning tool.
STARTER provides the following functions for this purpose:
● Function generator
● Trace
8.9.1 Optimization of closed-loop armature current control
Determining the armature circuit parameters (3 options)
1.
2.
3.
344
Determining the armature-circuit parameters according to the motor list
Take the armature circuit resistance (p50110) and armature circuit inductance (p50111)
from the motor manufacturers data.
Disadvantage: The data is very imprecise and/or the actual values deviate significantly.
Feeder cable resistances are not taken in the armature-circuit resistance. Additional
smoothing reactors and feeder cable inductances are not taken into account in the
armature-circuit inductance.
Roughly estimating the armature-circuit parameters from the rated data for the motor
and line supply
p50110 = Armature-circuit resistance [Ω]
p50101 = Rated armature voltage for motor [V]
p50100 = Rated armature current for motor [A]
The basis of this formula is that for the rated armature current, there is a drop of 10% of
the rated armature voltage across the armature circuit resistance Ra.
p50111 = Armature-circuit inductance [mH]
r50071 = Rated armature supply voltage for units [V]
p50100 = Rated armature current for motor [A]
This formula is based on the empirical value: The transition point from discontinuous to
continuous current is approximately 30% of the rated motor armature current.
Determining the armature circuit parameters by measuring the current/voltage
• Establish closed-loop current controlled operation
- p50084 = 2: Select closed-loop current controlled operation
- p50153 = 0: Precontrol disabled
- p50082 = 0: Switch-off the field to prevent motor from moving and, where
necessary, lock the rotor of the DC motor if retentiveness is too high.
- p50354 = 5%: Threshold for overspeed protection
- Enter 0 for the main setpoint.
- If "OPERATION ENABLE" has been applied and the "SHUTDOWN" command is
entered, an armature current of approximately 0% will now flow.
SINAMICS DCM DC Converter
Operating Instructions, 12/2018, A5E34763375A