The PowerFlex 750 series of drives offers users a highly versatile drive solution with ethernet, safety, and motion capabilities.  The wide range of options and the three variations of the 750 Series has prompted the offer of a handy selection guide.

Drive Break Down

Attribute / Ability PowerFlex 753 PowerFlex 755 PowerFlex 755T
On Board Options Built In IO Built in Ethernet Built in Ethernet
Rating @ 480VAC 1-400 HP 1-2000 HP 10-6000 HP
Ambient Temp Limit 50°C (122°F) 50°C (122°F) 40°C (104°F)
EMC Filter Internally Mounted Option Internally Mounted Option Internally Mounted Option
Output Frequency 0-590 Hz 0-590 Hz 0-590 Hz
Communication Options Option Cards for Ethernet/Device net/Others Built in Ethernet + Option Cards Built in DLR Ethernet + Option Cards
Analog Inputs / Outputs Up to 7 total, One on Main Board Up to 10 Total Up to 10 Total
Digital Inputs Up to 21, three on main board Up to 31 Up to 31
Relay Outputs Up to 7 total, One on Main Board Up to 10 total Up to 10 total
Safety Options 20-750-S & 20-750-S1 20-750-S/S1/S3/S4 20-750-S/S1/S3/S4
Permanent Magnet Motor Control Internal PM Motor Control Surface and Internal Mount PM Control Surface and Internal Mount PM Control
DeviceLogix Yes Yes Yes
Surface Mount PM Motor Control No Yes Yes
CIP Safety No Yes Yes
CIP Motion No Yes Yes
Torque Proving No Yes Yes
Anti-Sway Function No No Yes
Active Front End Tech No No Yes
Built in Harmonic Filter No No Yes
Built in Regen Capacity No No Yes
Load Observer with Torque Notching No No Yes


Diagnostic Items 6 6 10

Drive Application Strategy

The list above is not exhaustive but represents the aspects of the three drive platforms that interest many users.  To speak to selection strategy, we might consider the following scenarios:

Scenario Choice
Control a 50HP motor and connect remotely to a SCADA system A 753 with a 20-750-ENETR card would best meet the needs for HP and connectivity in this case.
Crane Application A 755’s torque proving will expertly control the crane and allow for maximized functionality and safety.  If anti-sway is also desired, then the 755T would best suit the application.
Safe Torque-Off over ethernet is required. A 755 will allow for STO over ethernet, while a 753 has hardwired STO only
A 50HP application that will need to take advantage of CIP motion commands A 755 will be able to meet these requirements of this application
1000HP Motor needs VFD Control at 480VAC The 755 operates up to 2000HP, while the 753 is limited to 400HP at 480VAC
High HP dynamic load with the need for precise torque control The 755T’s load observer technology will shine in this application
A 3000HP application with the need for harmonic mitigation The 755T‘s industry-leading footprint and built-in harmonic technology will well suit this application well

The above scenarios illustrate the best use of each drive platform in the PowerFlex 750 family.  To round out our exploration of the 750 series family, here are a few more points to ponder as we consider proper drive selection:

  • The 753 + the 20-750-ENETR option card is more cost-effective than a 755 of equivalent HP on its own.
  • The 755 and 755T are capable of very sophisticated control methods that will be of interest to many, but if advanced control methodologies are not needed, a 753 will suit most applications provided the HP is within 400HP at 480VAC.
  • The 753 is capable of only hardwired safe torque off, while the 755 and 755T can use the 20-750-S3 & S4 cards for STO over ethernet.
  • The 20-750-ENETR can offer 8 datalinks within Studio5000, while the 20-COMM-E only offers 4.
    • The 20-750-ENETR is more cost-effective than the 20-COMM-E.
    • A 20-COMM-E can be installed in a 750 Series drive but will need to be accompanied by a 20-750-20COMM-F1 for frame 1 drives, and a 20-750-20COMM for frame 2 and larger drives

For more detailed information about the 753 and 755, please reference the installation manual.  The technical data for the 755T may be found here.

For more information about drives and drive systems, check out the Variable Frequency Drive Main Help Page