Rockwell Automation Publication 6000-TD004D-EN-P - November 2017 35
Functional Descriptions Chapter 1
• Current Stability Loop Frequency Range2 Output Scaling Factor (P070)
• Current Stability Loop Frequency Range3 Output Scaling Factor (P071)
• Current Stability Loop Enable Delay (P072)
In most cases, the default parameter values need not be changed.
Flying Start
This function is used to enable a fast motor restart without having to stop the
motor. There are three flying start modes available in PowerFlex 6000 – search
frequency from setting-frequency, search frequency from last stop frequency plus
five Hz, and search frequency from maximum frequency.
The flying start function can identify the motor speed based on the output
current.
The following parameters may need to be adjusted based on your application:
• Flying Start-Initial Output Voltage Percentage (P113)
• Flying Start-Current Comparison Delay For Motor Speed Search (P114)
• Flying Start-Current Threshold For Successful Motor Speed Search (P115)
• Flying Start Compensation Enable (P393)
• Flying Start Compensation Current Threshold (P394)
• Flying Start Compensation Frequency Reduce Speed (P395)
• Flying Start Compensation Defer Restore Voltage Speed Current Threshold
(P408)
• Flying Start Compensation Current Threshold for Fast Compensation
(P410)
• Flying Start Mode (P416)
• Flying Start Motor Speed Search Timeout (P417)
• Flying Start Voltage Recovery Time (Low Speed Region) (P457)
• Flying Start Voltage Recovery Time (High Speed Region) (P459)
• Flying Start Low/High Speed Regions Boundary (P463)
In most cases, the default parameter values need not be changed.
Here are some tips to use the function more effectively. If the drive is unable to
detect the correct speed setting, increase Flying Start Motor Speed Search Timeout
to decrease the search steps and improve the accuracy, or increase Flying Start-
Initial Output Voltage Percentage and decrease Flying Start-Current Threshold For
Successful Motor Speed Search to improve the accuracy. If there was some noise
during the restore stage, increase Flying Start Voltage Recovery Time (Low Speed
Region) or Flying Start Voltage Recovery Time (High Speed Region). It is not
necessary to change Flying Start Low/High Speed Regions Boundary.
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