Rockwell Automation 20D PowerFlex 700S AC Drives with Phase II Control Reference Manual - Manual (Page 76)

76 Rockwell Automation Publication PFLEX-RM003E-EN-E - January 2011
Chapter 1 Detailed Drive Operation
Output Display Output Current (Parameter 308)
This parameter displays the measured RMS drive output current. Parameter 297
[Output Curr Disp] is the integer equivalent of parameter 308 with a resolution
of 1/10 amperes.
Output Freq (Parameter 310)
This parameter displays the actual output frequency of the drive. The output
frequency is created by a summation of commanded frequency and any active
speed regulation, such as slip compensation, Proportional Integral (PI) loop, or
bus regulation. The actual output may be different than the commanded
frequency.
Output Power (Parameter 311)
This parameter displays the output kW of the drive. Motor Power is the
calculated product of the torque reference and motor speed feedback. A 125 ms
filter is applied to this result. Positive values indicate motoring power; negative
values indicate regenerative power. The output power is a calculated value and
tends to be inaccurate at lower speeds. It is not recommended for use as a process
variable to control a process.
Output Voltage (Parameter 307)
Displays RMS line-to-line fundamental output voltage at the drive output
terminals. This data is averaged and updated every 50 ms. The actual output
voltage may be different than that determined by the sensorless vector or V/Hz
algorithms because it may be modified by features such as the Auto-Economizer.
Overspeed Limit The absolute overspeed limit parameter, 335 [Abs OverSpd Lim], is used to set a
limit tolerance level below parameter 75 [Rev Speed Limit] and above parameter
76 [Fwd Speed Limit] that provides a safe working speed limit.
Example 1:
The speed reference is set to equal parameter 76 [Fwd Speed Lim]. Based on
tuning of the drive, the speed could overshoot the commanded speed. If
parameter 335 [Abs OverSpd Lim] is set to zero and an overshoot in speed
occurs, an absolute overspeed fault will occur.