Rockwell Automation 7000 PowerFlex Medium Voltage (B Frame) Commissioning - ForGe (PanelView 550) - Manual (Page 108)

104 Rockwell Automation Publication 7000-IN006B-EN-P - May 2013
Chapter 5 Commissioning the Drive
3. Set Autotune Lmd to a value of 10.00. Confirm the field supply’s reference
input is at maximum. Adjust the analog output scaling parameter if
necessary.
4. Start the field supply and confirm that the field current goes to its
maximum value. If necessary, adjust the field supply to achieve a field
current slightly above rated.
5. Stop the field supply. Assign variable I Field Command in “Flux Control”
to the analog output used to control the field supply (e.g. ACB Port 1).
The setup of the field current reference is complete and you can proceed
with the tuning of the FluxSpeed regulator.
Flux Speed Reg Auto-tuning (Synchronous Motor)
The following parameters determine the Flux Speed regulator tuning for a
synchronous machine:
• FlxReg Bandwidth in Flux Control
• Lm Rated in Motor Model
• T Rotor in Motor Model
• Lmd in Motor Model
• SpdReg Bandwidth in Speed Control
• Total Inertia in Speed Control
The Flux Speed 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.
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
Set Flux Regulator Bandwidth 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.
ATTENTION: Applying maximum field current to a stationary machine for an
extended period may damage the exciter. Adjust the current as quickly as
possible.