Allen-Bradley PowerFlex 755 Reference Manual

Chapter 2
Behavior models used in CIP Motion
80 Rockwell Automation Publication MOTION-RM003I-EN-P - February 2018
Open Loop Frequency Control model
Associated with drives that do not have a current control loop and typically drive
an induction motor, also known as Volts/Hertz or Variable Frequency Drives
(VFDs). The following diagram provides an overview of this method.
See also
Closed Loop Velocity Control on page 80
Open Loop Frequency Control on page 83
The Closed Loop Velocity Control method is targeted for applications that
require tight speed regulation. The command input to the velocity loop can be
derived directly from the Velocity Command of the Command Generator when
configured for Velocity Control Mode or from the Position Loop Output when
configured for Position Control Mode.
When serving as an outer velocity loop in Velocity Control Mode, the device
applies the Velocity Command input to the velocity command summing junction
to generate the Velocity Reference signal into a PI regulator. Contributing to the
velocity command summing junction also is the Velocity Trim input, which can
Closed Loop Velocity Control

Allen-Bradley PowerFlex 755 Specifications

General

Category	AC Drive
Amperage	2.2…1470 A
Output Voltage	0 to Input Voltage
Output Current	2.2…1470 A
Enclosure	IP20, IP30, IP54
Communications	EtherNet/IP, ControlNet, DeviceNet
I/O	Digital, Analog, Encoder, Relay
Safety	Safe Speed Monitor
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overload, Short Circuit, Ground Fault, Overtemperature
Operating Temperature	-10°C to 50°C (14°F to 122°F)
Storage Temperature	-40°C to 70°C (-40°F to 158°F)
Humidity	5…95% noncondensing
Altitude	Up to 1000m (3300ft) without derating
Voltage	200-240V AC, 380-480V AC, 500-600V AC, 690V AC
Input Voltage	200-240V AC, 380-480V AC, 500-600V AC, 690V AC
Control Method	Sensorless Vector