i550 Protec Frequency Inverter
The award-winning i550 protec inverter delivers proven cabinet inverter technology in a decentralized design with higher protection rating. Ideal for space-constrained installations or mounting near motors of various machine modules, this versatile device features an extension box for maintenance switches and control elements. Complies with eco-design directive EN IEC 61800-9-2.
Application Areas
Conveyor drives, travel drives, winding drives, lifting drives, extruders, packaging machinery, pumps, fans, and more.
Product Highlights
- Distributed drive technology with IO-Link interface (Version 1.1)
- Integrated diagnostic interface (Micro USB) for maintenance
- Versions with/without maintenance switch, and with operation panel or WLAN module for easy commissioning
- Optional "Safe Torque Off (STO)" function compliant with SIL 3 (EN IEC 62061/EN IEC 61508) and Performance Level e (EN ISO 13849-1)
Technical Specifications
| Specification Category |
Detailed Specifications |
| Basic Power |
Rated power range: 0.37 kW - 75 kW (3-phase models only)
Rated output current: 1.7 A - 150 A (varies by power rating) |
| Electrical Parameters |
Input voltage: 3-phase 380 V - 480 V (±10%)
Input frequency: 45 - 65 Hz
Output voltage: 0 - Input voltage (continuously adjustable)
Output frequency: 0 - 599 Hz
Overload capacity: 150% for 60s, 200% for 3s |
| Control Functions |
Control modes: V/F control (linear/square law), sensorless vector control
Core functions: Slip compensation, DC braking, flying restart, energy-saving mode, automatic torque boost, PID regulation
Start/stop methods: Ramp start/stop (0.1-3600s adjustable), free stop, inching |
| Standard I/O Configuration |
Digital inputs: 4 channels (configurable NPN/PNP, 24V DC)
Digital outputs: 2 channels (relay output, max 2A/250V AC)
Analog inputs: 2 channels (0-10V / 4-20mA, 12-bit resolution)
Analog outputs: 1 channel (0-10V / 4-20mA, 12-bit resolution)
Communication I/O: IO-Link v1.1 (master/slave mode) |
| Communication & Interfaces |
Standard communication: Modbus RTU (RS485), IO-Link v1.1
Optional communication modules: EtherCAT, Profinet, Ethernet/IP, CANopen
Diagnostic interface: Micro USB (for parameter debugging & firmware update)
Wireless support: Optional WLAN module (for remote commissioning) |
| Safety Functions |
Standard protection: Overcurrent, overload, overvoltage, undervoltage, overheating, phase loss, motor stall, ground fault protection
Optional safety function: STO (Safe Torque Off) - SIL 3 (EN IEC 62061/61508), PL e (EN ISO 13849-1) |
| Protection & Installation |
Protection rating: IP66 / NEMA 4X (dust-tight, water jet-proof)
Mounting method: Wall-mounted, decentralized installation (near motor)
Ambient temperature: -10℃ - 50℃ (no derating), 50℃-60℃ (linear derating 2.5%/℃)
Relative humidity: 5% - 95% (non-condensing)
Ingress protection: Resistant to dust, water jets, and mild chemical corrosion |
| Mechanical Specifications |
Dimensions (W×H×D):
• 0.37-2.2kW: 145mm×280mm×120mm
• 3-7.5kW: 180mm×350mm×140mm
• 11-30kW: 240mm×450mm×160mm
• 37-75kW: 320mm×580mm×180mm
Weight: 3.2kg - 35kg (varies by power rating)
Protection coating: Anti-corrosion coating (for harsh industrial environments) |
| Certifications & Standards |
Safety certifications: CE, UL, CSA, ATEX (optional explosion-proof)
Eco-design: Complies with EN IEC 61800-9-2
EMC: Complies with EN 61800-3, EN 55011 (Category C2)
Ingress protection: EN 60529 (IP66), NEMA 4X |
| Other Features |
Cooling method: Natural cooling (≤11kW), forced air cooling (≥15kW)
Extension capability: Optional extension box (supports maintenance switch, emergency stop button, and local control elements)
MTBF: ≥ 60,000 hours (at 25℃ ambient temperature) |
Model Selection Guide
| Model No. |
Rated Power |
Core Configuration |
Key Features & Application Scenarios |
| i55PE137F10V11000s |
0.37kW (0.5hp) |
IP66 protection, standard I/O, Modbus RTU, natural cooling |
Compact size; Suitable for small conveyors, micro-pumps in dusty/wet workshops |
| i55PE155F10V11000s |
0.75kW (1hp) |
IP66 protection, standard I/O, Modbus RTU, slip compensation |
Ideal for small fans, packaging machine auxiliary drives; Resists water jets and dust |
| i55PE175F1AV11000s |
1.1kW (1.5hp) |
IP66 protection, IO-Link v1.1, STO (SIL 3), standard I/O |
Supports smart sensor integration; Suitable for safety-sensitive small equipment |
| i55PE215F10V11000s |
1.5kW (2hp) |
IP66 protection, Modbus TCP/IP, PID regulation, energy-saving mode |
Remote monitoring via network; Suitable for water pumps, ventilation fans |
| i55PE222F1AV11000s |
2.2kW (3hp) |
IP66 protection, Profinet, STO (SIL 3), DC braking |
Integrates with factory automation systems; Ideal for small extruders, assembly line conveyors |
| i55PE237F10V11000s |
3.7kW (5hp) |
IP66 protection, standard I/O, flying restart, forced air cooling |
Withstands high-temperature environments; Suitable for medium pumps, mixer drives |
| i55PE255F1AV11000s |
5.5kW (7.5hp) |
IP66 protection, EtherCAT, STO (SIL 3), IO-Link v1.1 |
Real-time communication for production lines; Suitable for winding drives, precision conveyors |
| i55PE311F10V11000s |
11kW (15hp) |
IP66 protection, Modbus RTU, overload protection (150%/60s), anti-corrosion coating |
Resists moisture and chemical corrosion; Suitable for wastewater treatment pumps, marine equipment |
| i55PE315F1AV11000s |
15kW (20hp) |
IP66 protection, Ethernet/IP, STO (SIL 3), free stop function |
Compatible with US industrial grids; Ideal for large conveyor systems, travel drives |
| i55PE330F10V11000s |
30kW (40hp) |
IP66 protection, standard I/O, large output current (61A), forced air cooling |
Suitable for extruders, large fans in steel plants or chemical factories |
| i55PE337F1AV11000s |
37kW (50hp) |
IP66 protection, CANopen, STO (SIL 3), energy-saving mode |
Adaptable to modular production lines; Suitable for heavy lifting drives, large-scale mixers |
| i55PE375F10V11000s |
75kW (100hp) |
IP66 protection, Modbus TCP/IP, high overload capacity (200%/3s), anti-vibration design |
Withstands harsh operating conditions; Suitable for large pumps, ventilation systems in power plants |
| i55PE175F10V11006s |
1.1kW (1.5hp) |
IP66 protection, WLAN module, standard I/O, wireless commissioning |
Supports wireless parameter adjustment; Ideal for equipment in hard-to-reach areas |
| i55PE255F10V11006s |
5.5kW (7.5hp) |
IP66 protection, WLAN module, EtherCAT, IO-Link v1.1 |
Enables remote diagnostics; Suitable for Industry 4.0 production lines, collaborative robots |
Industry Applications
Logistics, Warehousing & Material Handling
Core Scenarios: German e-commerce sorting centers, US port container yards, Southeast Asian e-commerce warehouses
Adaptation Advantages: IP66 protection eliminates control cabinets; vibration-resistant design suits high-frequency start/stop; multi-protocol compatibility with global warehouse management systems
Food & Beverage Processing
Core Scenarios: Italian dairy plants, US craft breweries, Thai fruit canning factories
Adaptation Advantages: IP66/NEMA 4X protection meets food industry cleaning standards; fanless design reduces dust buildup; wide voltage tolerance adapts to unstable power grids
Rubber, Plastic & Chemical Industry
Core Scenarios: German PVC pipe factories, US chemical plants, Middle Eastern plastic film factories
Adaptation Advantages: High overload capacity handles startup loads; anti-corrosion coating suits harsh chemical environments; precise speed control meets material processing accuracy
Water Treatment & Environmental Protection
Core Scenarios: Indian sewage treatment plants, US municipal water systems, African water purification stations
Adaptation Advantages: IP66 protection adapts to humid/dusty environments; wide voltage range compatible with global power grids; direct sensor connection enables unmanned automatic control
Construction & HVAC
Core Scenarios: Dubai high-rise buildings, Nordic shopping malls, North American factory workshops
Adaptation Advantages: IP66 protection adapts to harsh equipment room environments; energy-saving mode meets global efficiency standards; wireless commissioning reduces high-altitude operation risks
Agriculture & Aquaculture
Core Scenarios: Vietnamese shrimp farms, Brazilian coffee plantations, Kenyan greenhouses
Adaptation Advantages: IP66 protection withstands harsh outdoor environments; wide voltage/vibration-resistant design adapts to unstable rural power; simple operation suits non-professional operators
Key Adaptation Highlights
- Cabinet-Free Installation: IP66/NEMA 4X protection allows direct mounting near motors, reducing wiring and control cabinet costs
- Global Grid Compatibility: 380-480V wide input voltage covers mainstream grids worldwide without additional transformers
- Harsh Environment Resistance: Dust/water/corrosion/vibration resistance adapts to high-temperature, humid, dusty industrial scenarios
- Safety Compliance: Optional STO (SIL 3/PL e) safety function meets strict European/North American safety standards
- Smart Integration Readiness: IO-Link/EtherCAT/Profinet support adapts to Industry 4.0 and smart factory upgrades
Frequently Asked Questions
Q: We run a small logistics warehouse in Southeast Asia, and the workshop is dusty with frequent water splashes during cleaning. Can the IP66 protection really prevent dust and water from damaging the inverter?
A: Absolutely—IP66 is fully dust-tight and water-jet proof, which is perfect for your scenario. We have a Malaysian customer with a furniture warehouse: their conveyors are cleaned with high-pressure water guns every day, and the i550 protec inverters have been running for 2 years without any water or dust issues.
Q: Our U.S. factory uses 480V 3-phase power. Do we need a transformer to use this inverter, or can it be connected directly?
A: No transformer needed—connect it directly. The i550 protec's input voltage range is 380-480V (±10%), which perfectly matches North America's 480V industrial grid.
Q: We're installing the inverter on an outdoor AGV in Europe. Will the -10℃ to 60℃ temperature range handle winter cold and summer heat?
A: It'll handle it easily. We have a German customer using these on AGVs in their outdoor logistics yard: winters drop to -8℃, and summers hit 55℃, but the inverters never shut down.
Q: We need to integrate the inverter with our factory's Profinet system. Does it come with Profinet as standard, or do we need to buy an extra module?
A: It depends on the model—basic models only have Modbus RTU as standard. To get Profinet, you need to choose models with "AV" in the name or add the optional Profinet module.
Q: Our African farm's power grid is very unstable—voltage often drops from 415V to 360V. Will the inverter shut down or burn out?
A: It won't shut down or burn out—its wide voltage tolerance means it can handle drops down to ~342V. The only time it might shut down is if voltage drops below 340V for more than 3 seconds, which is rare.
Q: We want to commission the inverter remotely since it's mounted high up on our warehouse's ventilation fans. Does it support wireless commissioning, and how easy is it to set up?
A: Yes, it supports wireless commissioning—just buy the optional WLAN module. Setup is super easy: connect the module, download Lenze's app, and pair via Bluetooth.
