# Manual Setting Of Armature Resistance R A (p110) And Armature Inductance L A (p111) - Siemens 6RA7086-6KS22 Operating Instructions Manual

6ra70 series, microprocessor-based converters from 6kw to 2500kw for variable-speed dc drives, simoreg dc master.

Start-Up
Documentation of setting values
13
• Read out parameters with DriveMonitor (see Section 15 "DriveMonitor")
or
• Document parameters
If P052=0, only parameters that are not set to the default setting are displayed on the operator
control panel.
7.6
Manual optimization (if required)
7.6.1
Manual setting of armature resistance R A (P110) and armature inductance
L A (P111)
• Setting of armature circuit parameters according to motor list
Disadvantage: The data is very inaccurate and/or the actual values deviate significantly.
The feeder resistances are not taken into account in the armature circuit resistance.
Additional smoothing reactors and feeder resistances are not taken into account in the armature
circuit inductance.
• Rough estimation of armature circuit parameters from motor and supply data
Armature circuit resistance P110
=
R
[Ω
]
A
10
The basis for this formula is that 10% of the rated armature voltage drops across armature
circuit resistor R
Armature circuit inductance P111
=
L
[mH]
A
The basis for this formula is the empirical value: The transition from discontinuous to continuous
current is at approx. 30% of the rated motor armature current.
• Calculation of armature circuit parameters based on current/voltage measurement
− Select current-controlled operation: P084=2
− Set parameter P153=0 (precontrol deactivated)
− The field must be switched off by setting P082=0 and, in the case of excessively high
residual flux, the rotor of the DC motor locked so that it cannot rotate.
− Set the overspeed protection threshold P354=5%
− Enter a main setpoint of 0
− If "ENABLE OPERATION" is applied and the "SWITCH ON" command entered, an armature
current of approximately 0% now flows.
7-18
Rated
motor
armature
Rated
motor
armature
at rated armature current.
A
1.4
Rated
converter
supply
Rated
voltage
[V]
(P101)
current
[A]
(P100)
voltage
of
armature
motor
armature
current
power
section
[V]
(P071)
[A]
(P100)
SIEMENS AG
SIMOREG DC Master
Operating Instructions
05.05