Rockwell Automation 1302 575v AC Drive - Canada Only - Manual (Page 66)

8–8 Programming
Publication 1302-5.0 — January, 1998
FĆ08 RPM at Base Speed
This parameter scales the RPM
display and the setpoint to a
userĆspecified engineering unit.
Parameter Range:
Default Setting:
Step Size:
10 to 9999
1750
1.0 unit
This parameter defines the scaling value applied to the current speed before it is displayed. It is also
used to scale the local reference when FĆ18 is set to ON.
The value to enter into FĆ08 is the maximum value (in RPM, hertz, or any other engineering unit) to be
displayed when the Drive is running at base speed (FĆ07).
Display Scaling Examples
Example 1: Assume that an application requires the display show 1750 RPM when the drive is running
at a base speed of 60 Hz. The RPM display is scaled according to the following equation:
Present Operating Speed (Hz) FĆ08
FĆ07 + Displayed Value
At 30 Hz, the RPM display will show 875:
30 Hz 1750
60 + 875
30 Hz 20
60 + 10
Example 2: Assume the application requires the display show 20 feet per minute for a conveyor (or 20
gallons per minute for a pump) when the motor is running at base speed (FĆ07= 60 Hz). Enter 20 in
parameter FĆ08 to scale the display.
At 30 Hz, the display will show 10 feet (or gallons) per minute: