Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) Commissioning - ForGe Control - Manual (Page 107)

Rockwell Automation Publication 7000-IN012B-EN-P - June 2014 107
Commissioning the Drive Chapter 4
2. Set the analog output scale parameter (e.g. Anlg Out1 Scale in Analog
Output) to:
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.
3. 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.
4. 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
(P#131), T Rotor (P#132) in Motor Model Group and Total Inertia (P#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 30 Hz. 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.
ATTENTION: Applying maximum field current to a stationary machine for an
extended period may damage the exciter. Adjust the current as quickly as
possible.
Analog Scale
Maximum analog input of field supply
10V
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