If you're already familiar with the PowerFlex 755T platform and its TotalFORCE technology, you're probably asking the more practical question: which model do I actually need? If you're coming to this fresh, we'd recommend starting with our overview article first: What Is TotalFORCE Technology? Key Features of the PowerFlex 755T Series.
The four 755T variants—TS, TL, TR, and TM—all share the same TotalFORCE foundation. The differences come down to power topology, harmonic performance, and system architecture. Here's how we categorize each one.
PowerFlex 755TS: The Six-Pulse All-Rounder
The 755TS is the first standard industrial six-pulse drive with full TotalFORCE technology, and the most broadly applicable model in the family. It covers everything from conventional VFD applications to demanding motion control requiring precise speed, torque, and positioning, with wall-mount solutions available up to 500 Hp for space-constrained installations.
- Power range: 0.5–500 Hp / 0.75–355 kW across 200/240V, 400V, 480V, 600V, and 690V
- Networking: Built-in dual-port Gigabit Ethernet/IP delivering 10x the throughput of standard 10/100 connections
- Motor support: Induction, permanent magnet, and synchronous reluctance
- Operating temperature: -20–50°C without derating; up to -20–60°C with derate
- XT protection: Available as an option
Best for: general VFD applications, facilities modernizing legacy drives, and advanced motion control, particularly where harmonic mitigation or regeneration isn't required.
PowerFlex 755TL: Low Harmonic, High Power Factor
The 755TL uses active front-end (AFE) technology to deliver built-in harmonic mitigation and power factor correction, keeping total harmonic distortion at or below the 5% threshold required by IEEE 519, without external filters or auto-transformers adding cost and complexity.
- Power range: 10–1800 Hp (480V) / 7.5–1250 kW (400V); also available at 600V and 690V
- Harmonic performance: ≤5% THD per IEEE 519
- XT protection: Standard on every 755TL
Best for: facilities with sensitive electrical infrastructure, strict utility power quality requirements, or environments where harmonic distortion is already causing problems for other equipment.
PowerFlex 755TR: Regenerative Energy Recovery
The 755TR builds on the 755TL's active front-end technology and adds full regenerative capability: returning 100% of braking energy to the incoming power supply rather than dissipating it as heat. This eliminates braking resistors and all associated cooling equipment, wiring, and maintenance costs. In high-cycle braking applications, the total cost of ownership difference compared to resistive braking can be substantial.
- Power range: 10–6000 Hp (480V) / 7.5–3640 kW (400V); also available at 600V and 690V
- Special option: Liquid-cooled wall-mount configuration at 300 Hp (223 kW) for installations with chilled water access
- XT protection: Standard on every 755TR
Best for: cranes, hoists, centrifuges, winders, test stands, and any application with significant braking energy or high-cycle deceleration demands.
PowerFlex 755TM: Common Bus Multi-Motor Systems
The 755TM takes a fundamentally different approach to multi-motor applications. Rather than supplying AC power independently to each drive, multiple inverters share a common DC bus, meaning decelerating motors feed energy directly to accelerating motors without routing it back through the incoming supply.
The result is reduced system energy consumption and a dramatically simplified installation with less cabling, fewer protective devices, and no need to wire AC power to each drive individually.
- Common Bus Inverter: 250–6000 Hp (480V) / 160–3640 kW (400V); also available at 600V and 690V
- Regenerative Bus Supplies: 90–4818 kW (480V) / 87–4358 kW (400V)
- Bus options: Regenerative and non-regenerative configurations available
- XT protection: Standard on every 755TM
Best for: multi-axis machines, coordinated conveyor systems, and process lines with mixed motoring and regenerating loads, particularly where minimizing installation footprint and cabling complexity are priorities.
Shared Specifications
All four 755T models share the following:
- Communications: EtherNet/IP, ControlNet, DeviceNet, PROFIBUS DP, PROFINET, CANopen, Modbus RTU, BACnet MSTP, fiber optic drive-to-drive
- Safety: Hardwired and networked STO, Safe Speed Monitor, and Integrated Safety Functions at SIL3/PLe CAT 3 and CAT 4
- Motor control modes: Sensorless vector, flux vector, V/Hz, field-oriented control, economizer, permanent magnet, synchronous reluctance
- Velocity bandwidth: 300 Hz (1885 rad/sec); Position bandwidth: 207 Hz (1301 rad/sec)
- Torque accuracy: 2% of rated torque to 5% of base speed; 5% below 5% of base speed
- Storage temperature: -40–70°C; Humidity: 0–95% non-condensing
- Certifications: c-UL-us, CE, EAC, KCC, RCM, RoHS, Seismic
Which Drive Is Right for You?
- 755TS: versatile six-pulse drive for general and advanced applications without specific harmonic or regeneration requirements
- 755TL: active front-end drive when power quality and IEEE 519 compliance are priorities
- 755TR: regenerative drive when significant braking energy is in play, and you want to recover it rather than waste it
- 755TM: common bus system for multi-motor applications, prioritizing energy sharing and installation efficiency
Making the Right Call
The right 755T model isn't always obvious from spec sheets alone; the difference between the TS and TL, or the TR and TM, often comes down to application details that aren't captured in a power range or voltage rating. Getting the decision right up front saves significant time, cost, and frustration down the road.
At HESCO, we've helped customers across a wide range of industries navigate exactly this decision, and we support customers through the full lifecycle: from initial specifications through startup commissioning and beyond.
Contact the HESCO team today. Tell us about your application, and we'll make sure you land on the right drive, configured correctly, and set up to perform from day one.
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