Siemens SINAMICS Series User Manual

Commissioning
8.9 Manual optimization
SINAMICS DCM DC Converter
344 Operating Instructions, 12/2018, A5E34763375A
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.
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.
2.
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.
3.
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.

Siemens SINAMICS Series Specifications

General

Product Line	SINAMICS
Cooling Method	Air-cooled, Liquid-cooled
Voltage Range	200 V to 690 V
Power Range	0.12kW - 250kW
Communication Interfaces	PROFINET, PROFIBUS, Ethernet
Control Modes	Vector control, V/f control
Protection Class	IP20
Type	Variable Frequency Drives (VFD)