Rockwell Automation Publication 20D-RN047A-EN-P - October 2019
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Instantaneous Overcurrent Fault (F27) May Occur when Saving to EEPROM on
High Horsepower Drives
An instantaneous over current fault (“Inst Overcurrent” - F27) may occur when
saving to EEPROM from the HIM or DriveExecutive while the drive is running
on high horsepower drives (frames 9 and up). Note: The drive automatically saves
all parameter values to EEPROM.
Parameter 554 [LED Status] Not Functioning Properly
Parameter 554 [LED Status], bit 15 “DL ComActive”, does not work.
Trend Functions May Cause Drive to Stop Running
When using
the trend functions, a PowerFlex 700S drive may stop running. The
power to the drive must be cycled in order to correct this condition. If the
DriveLogix™ option is present the 5730 controller may lose its program.
Overload Faults for Frames 9 and Up Drives Due to Power Limits
The Power Limits directly set the Torque Limit value for frame 9 and up drives
running in the Encoder or Sensorless modes. The Power Limit also directly
controls the value of Torque Limit for frames 1…6 drives in the Sensorless mode.
Thus, the divide by speed term is not used to determine the Torque Limit. The
drive is configured in this manner to prevent the frame 9 and up drives from
tripping on F71 (HiHp Drv OvrLoad) faults. In the sensorless mode, during
regeneration, the drive can also trip because the Bus Voltage Regulator interacts
with the negative Power Limit. This interaction is made worse on frame 9 and up
drives because of the smaller capacitor bank.
Current Limit in V/Hz Mode
The current limit in the V/Hz mode is controlled by parameter 356 [Mtr
Current Lim] and 362 [Current Limit Gain], 363 [Ki Current Limit], and 364
[Kd Current Limit].
