238 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 4 Commissioning
Tuning Procedure
The PowerFlex 7000 “C” Frame medium voltage drive must be tuned to the
motor and load to which it is connected. There are three drive functions that
require tuning. These are listed below in the order in which they are usually
performed:
1. Rectifier
2. Mtr Impedance
3. FluxSpeedReg
The first two functions can be tuned with the motor stationary, but third
function requires the motor to rotate. In case the drive cannot complete the
tuning, it should be carried out manually.
1. Rectifier
The Rectifier tuning function calculates parameter Input Impedance (140) and
TDCLink (115) in Current Control group.
Input Impedance
Input Impedance is used in the software reconstruction of the line voltage to
compensate for the drop in the line impedance. It is also used in the calculation of
the line converter retard limit (for SCR rectifiers) to ensure proper operation
under all conditions of line voltage and load current. If the Input Impedance
parameter is not correctly adjusted, the resulting error in the reconstructed line
voltage may cause line synchronization faults and incorrect reading of the
incoming line voltage.
The Input Impedance parameter is tuned with the drive operating in the dc
current test mode. Although the Input Impedance was tuned during factory test,
it must be retuned during commissioning because its value is determined by the
impedance of the input transformer and harmonic filter (if present).
You will need to have a minimum of SERVICE level access to complete manual
tuning. If you do not have SERVICE level access, please contact the factory.
Make sure the following tuning parameters are set to default values:
• Input Impedance (P#140)
• T DC Link (P#115)
• R Stator (P#129)
• L Total Leakage (P#130)
• Lm Rated (P#131)
• T rotor (P#132)
• Total Inertia (P#82)
• Lmd (P#418)
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