Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 104)

104 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 1 Drive Configuration
Example
In this example the current limit was set at some value such that when the stop
was issued the output current was clamped at that setting. Note the decel time is
extended.
Voltage Class PowerFlex drives are sometimes referred to by voltage class, which identifies the
general input voltage to the drive. P305 [Voltage Class] includes a range of
voltages. For example, a 400V class drive has an input voltage range of 380…480V
AC. While the hardware remains the same for each class, other variables, such as
factory defaults, catalog number, and power unit ratings change. In most cases the
voltage of a drive can be reprogrammed to another value within the class by
resetting the defaults to something other than factory settings.
P305 [Voltage Class], is required by the drive when parameter downloads occur
and is generally not programmed individually. This parameter provides a “Low
Voltage” and “High Voltage” setting. The default value is dependent upon the
voltage that matches the catalog number (for example 400V or 480V). For
example, a drive shipped as 400V (catalog code “C”) has a default of “Low
Voltage” for P305 [Voltage Class]. A drive shipped as 480V (catalog code “D”)
has a default of “High Voltage.”
When a change is made to P305 [Voltage Class], the continuous current rating of
the drive changes by an amount equal to the published difference between catalog
numbers. With a change to the current rating, review P422 [Current Limit 1]
and P423 [Current Limit 2].
Also note that a Reset to Defaults “All” resets the voltage to the original factory
setting.
Current Limit - Lowered Limit
DC Bus Voltage Motor Current P685 Motor Speed
DC Bus V
oltag
e