Allen-Bradley PowerFlex 755 Manual

18 of 19
In the chart below, we see two sweep procedures, paying close attention to the current trace in blue. Notice
that in the procedure on the left, the Kp value is set to 25, which results in a deeper dip in current when the
motor has been detected. In the sweep procedure on the right, the Kp value is set to 500, resulting in a
shallower dip of current.
Reverse Sweep
In the case of a motor turning in reverse of commanded direction, a flying start in sweep mode will still work.
The frequency will sweep in the forward direction first, and if it does not detect the motor, will begin sweeping
in the reverse direction. Once the motor has been detected, the drive will safely bring it to a stopped state,
then proceed to bring it to its commanded speed.

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