Allen-Bradley PowerFlex 6000 Firmware, Parameters, And Troubleshooting Manual

28 Rockwell Automation Publication 6000-TD004D-EN-P - November 2017
Chapter 1 Functional Descriptions
Low Voltage Ride Through (LVRT)
This function is used to make sure the PowerFlex 6000 drive does not trip when
the input voltage drops (below 0.7 pu) or is cut off momentarily. Output current
will be limited to keep the power cell’s DC voltage at a high level and the running
parameters of the motor will be monitored during this period. When the input
voltage is back to normal, the drive will quickly recover to the previous frequency
before the low voltage condition occurred.
The parameter Low Voltage Ride Through Enable (P283) must be set to “1” to use
this function. Low Voltage Ride Through Max Time Limit (P285) is the upper
limit of the LVRT function. The default value is 5 cycles, and can be extended in
special cases. However extending the time limit may lead to LVRT failure. The
UPS must be open when using this function.
Power Loss Auto Restart
This function is used to restart the drive automatically after a power loss occurs
for a long period of time. This function can be used together with the Low
Voltage Ride Through function. The drive will enter the PLR stage when the
duration of the power loss exceeds the value of Low Voltage Ride Through Max
Time Limit (P285).
The parameter Power Loss Restart Enable (P263) must be set to “1” to use this
function. Power Loss Allowable Time (P264) is the upper limit of the Power Loss
Restart function, and the value should not be set larger than Power Loss Time
Max Limit (P265).
If the value of Power Loss Max Time Limit is set to less than the value of Power
Loss Allowable Time, then the value of Power Loss Allowable Time will be
automatically reduced so that both values are identical. The maximum duration
of the PLR stage is limited by both Power Loss Allowable Time and the working
time of the UPS. The UPS must be open when using this function.
Figure 11 - Low Voltage Ride Through Diagram
IMPORTANT
The running direction must not be changed during the “power loss, waiting
recovery...” stage. Otherwise a “fault trip” fault will occur.
Input
voltage
t=0 t=T
t<P264
Output
voltage
Fly start

Allen-Bradley PowerFlex 6000 Specifications

General

Brand	Allen-Bradley
Model	PowerFlex 6000
Category	DC Drives
Language	English