Allen-Bradley PowerFlex 755 User Manual

Rockwell Automation Publication MOTION-UM003K-EN-P - January 2019 113
Configure Integrated Motion Using a PowerFlex 755 Drive Chapter 5
Follow these steps to set the Base Update Period.
1. Click the Attribute tab in the Motion Group Properties dialog box.
2. Set the Base Update Period to 3.0…32.0 ms.
For the PowerFlex 755 drive, the minimum Base Update Rate 3 ms.
Coarse Update Rate
The position loop for the PowerFlex 755 drive is updated at a rate of 1.024 ms
(1024 µs). During each position loop update, the drive can either read or write
data to the embedded Ethernet port, but cannot do both operations during the
same update. Therefore the drive can receive only new updates every other
position loop update event. To read new information from the Motion
Planner, the minimum coarse update rate must be 2.5 ms or greater to be sure
that no data packets are lost. In this context, the Motion Planner is the
controller. If the PowerFlex 755 drive is operated at a coarse update rate of less
than 2.5 ms, data packets can be lost. The drive can also fault if enough data
packets are missed consecutively. These conditions result in the drive
interpolating between missed updates. We recommend a minimum coarse
update rate of 3 ms for the PowerFlex 755 drive.
TIP Check to see if the Last Scan time values on the Attribute tab are less.
Typically, the value is less than 50% of the Base Update Period.

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