Rockwell Automation 20G PowerFlex 750-Series AC Drives - Manual (Page 18)

18 Rockwell Automation Publication 750-RM002B-EN-P - September 2013
Chapter 1 Drive Configuration
Overview
Adjustable voltage control is enabled by setting P35 [Motor Ctrl Mode] to
option 9 “Adj VltgMode.” This feature provides either three-phase and single-
phase output voltage. The default mode is three-phase output voltage and is
selected by P1131 [Adj Vltg Config]. In single-phase mode the drive is not
designed to operate single phase motors, but rather the output load is considered
to have a lagging or unity power factor consisting of resistance and inductance for
specially designed motor or non-motor application.
Input reference sources can be configured from P1133 [Adj Vltg Select]. The
input source can be scaled and upper when lower limits are applied. A trim source
can be selected reference from P1136 [Adj Vltg TrimSel] with the trim voltage
added or subtracted from the voltage reference.
The scalar frequency selection and scalar frequency ramp are the same
components as used in all other control modes. The exception being the
frequency command and ramp are decoupled from the voltage generation for the
adjustable voltage control mode to provide an independent frequency ramp.
Acceleration and deceleration rates and S Curve are the same as used in all other
modes. Upper and lower limits are applied to the value of the output command
frequency.
The adjustable voltage control voltage ramp provides an independent voltage
ramp decoupled from the scalar frequency ramp and controlled by user selectable
acceleration and deceleration ramp times. There is also an adjustable percent S
Curve feature.
The current limit function reduces the output voltage when the current limit is
exceeded. Minimum and maximum voltage limits are applied so the output
voltage is never operated outside that range.
Adjustable Voltage Control Setup
The following examples of setups for the Adjustable Voltage Control mode are a
starting point for configuration. Applications can be unique and require specific
parameter settings. These examples are base case only.
Table 1 - Basic Adjustable Voltage Control Parameters
Parameter No. Parameter Name Setting Description
35 Motor Ctrl Mode 9 “Adj VltgMode” Adjustable Voltage feature is used in non-motor
applications.
1131 Adj Vltg Config 1 1 = 3-Phase Operation, 0 = 1-Phase Operation
1133 Adj Vltg Select Preset 1
1134 Adj Vltg Ref Hi 100 Percent
1140 Adj Vltg AccTime n Secs Application dependent