Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 227)

Commissioning 4-73
7000 “A” Frame 7000A-RM001A-EN-P – January 2011
FluxSpeed Reg Auto-tuning [Synchronous Motor]
The tuning of the FluxSpeed regulator for a synchronous machine is
determined by following parameters:
1. FlxReg Bandwidth in Flux Control
2. Lm Rated in Motor Model
3. T Rotor in Motor Model
4. Lmd in Motor Model
5. SpdReg Bandwidth in Speed Control
6. Total Inertia in Speed Control
The FluxSpeed Regulator tuning function calculates parameters, Lm
Rated (131), T Rotor (132) in Motor Model Group and Total Inertia
(82) in Speed Control group. This is combined Auto-tuning for Flux
and Speed regulator.
NOTE: During this autotune step the motor will run at speed set in
auto tune speed Cmd. The default setting is 30HZ. Make sure the
motor rotates during this autotune. Motor rotation must be verified
either physically or monitoring “FlxFbk VoltModel” (P#342). It is
possible that stall condition may calculate wrong tuning parameters.
If It happens, make sure the tuning parameters [Lm rated, T rotor,
Total Inertia) are set to default before starting this tuning again.
• Flux Regulator
Flux Regulator Bandwidth should be set to the default value for almost
all applications. Lm Rated, Lmd, T Rotor and Total Inertia are usually
unknown and must be measured. Although these motor parameters
change with different operating conditions, the variations do not
significantly affect the operation of the flux regulator.
The other aspect of flux control is the variation of motor flux with
speed. This is determined by two parameters:
1. Base Speed in Flux Control
2. FlxCmd RatedLoad in Flux Control
In most applications, the motor runs at constant flux below rated speed
and constant voltage above rated speed. The motor flux is normally set
to a level that provides rated voltage at rated speed and full load. The
flux level required to achieve this is a function of the motor parameters.
The flux regulator auto-tuning determines a value of rotor flux that
should provide rated motor voltage at full load and rated speed and sets
the flux command parameter to this value.