30 Rockwell Automation Publication 6000-TD004D-EN-P - November 2017
Chapter 1 Functional Descriptions
Only one cell bypass is allowed per phase, and it can be triggered by one of the
following conditions:
• IGBT over current
• Input over voltage in power cell
• One phase loss
• Cell overheat
To keep the line voltage balanced, each phase needs to bypass one cell at the same
time.
The following parameters are used for this function:
• Power Cell Bypass Enable (P041)
• Power Cell Bypass Delay After Power Cell Bypassed (P042)
• Power Cell Bypass Upper Limit For Bypassed Feedback Time (P043)
• Power Cell Bypass Fault Simulation Power Cell Count (P044)
• Power Cell Bypass Upper Limit For Over Temperature (P057)
• Power Cell Bypass Phase A Cell Number For Simulation (P058)
• Power Cell Bypass Phase B Cell Number For Simulation (P059)
• Power Cell Bypass Phase C Cell Number For Simulation (P060)
• Power Cell Bypass Fault Simulation (P061)
• Power Cell Bypass Enable Frequency Range Lower Limit (P065)
• Power Cell Bypass Restart Enable After Power Cell Bypassed (P066)
• One Phase Lost Filter Time (P068)
• Power Cell Reactivation Time Upper Limit (P078)
Parameter Power Cell Bypass Enable must be set to “1” to use this function. The
power cell count must not be less than three per phase, and the output frequency
must be higher than the value set in Power Cell Bypass Enable Frequency Range
Lower Limit. Under the above conditions, when any related fault occurs, the cell
bypass will be triggered.
Power Cell Bypass Restart Enable After Power Cell Bypassed is used to set the
restart behavior after a cell bypass is triggered. Set the value to “1” to allow the
drive to restart after a reset fault. Set the value to “0” to allow the drive to restart
only after the power cell is repaired and control power is on again.
When the drive is running and a power cell faults (IGBT over current, input over
voltage in power cell, one phase loss, cell overheat), a previously bypassed cell in
the same phase that only has the “Bypass In Power Cell” fault can be restarted and
bypass the faulty cell.
The cell bypass process is show in the following diagram.
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