Frequency converters for speed control of induction, permanent magnet, synchronous reluctance, and BLDC motors, 0.75 to 250 kW, 380 to 480 V, 3-phase, protection class IP00, IP20/IP21, or IP55.
The BLEMO ER330 is a high-performance variable-frequency drive designed for the energy-efficient and reliable control of pumps, fans, and compressors. The series was developed specifically for heating, ventilation, air conditioning, and refrigeration systems and combines precise motor control with comprehensive HVAC functions, modern building automation, and a high level of safety.
With a power range of 0.75 to 250 kW, various protection ratings up to IP55, and support for a variety of motor technologies, the ER330 is suitable for both traditional building automation and critical applications in data centers, hospitals, airports, and industrial utility systems.
| Feature | ER330 Frequency Converter |
|---|---|
| Applications | Pumps, fans, compressors, and other HVAC and refrigeration applications |
| Motor Power | 0.75 to 250 kW |
| Mains voltage | 380 to 480 V, 3-phase |
| Protection Rating | IP00, IP20/IP21, or IP55 / UL Type 12, depending on the model |
| Motor Types | Induction, Permanent Magnet, Synchronous Reluctance, and BLDC |
| Communication | Modbus RTU and BACnet MS/TP integrated; optional: BACnet/IP, PROFINET V2, EtherNet/IP, and Modbus TCP (dual port) |
| Control | Motor control, dual PID, and application-specific HVAC functions |
| Safety | STO up to SIL3 / Performance Level e |
| Cybersecurity | Security Level 1 in accordance with IEC 62443-4-2 |
| Power Quality | Harmonic Reduction and IEC 61000-3-12, depending on the model |
| Emergency Operation | Fire Mode and Forced Fire Mode for Smoke Exhaust and Emergency Applications |
If you’re unsure whether the ER330 is the right choice, we’d be happy to help.
Call us at 06106 / 82 95 – 0 or use the inquiry form—we’ll work with you to configure the right solution.
The ER330 is designed to meet the requirements of modern HVAC and refrigeration systems. It regulates motor speed according to demand, thereby enabling economical operation under varying airflow rates, pressures, and temperature requirements. Instead of running pumps or fans continuously at full speed and mechanically throttling the process, the output is adjusted directly to actual demand.
The ER330 can be integrated into modern building automation systems without the need for complex add-on solutions. Modbus RTU and BACnet MS/TP are supported for serial communication; BACnet/IP is available via an optional communication module. This allows setpoints, operating statuses, energy data, and diagnostic data to be monitored centrally via the building management system.
Speed control adjusts motor power to actual demand. This can significantly reduce energy consumption, particularly for pumps and fans, because it eliminates mechanical throttling losses. The integrated performance monitoring also helps evaluate and optimize system operation.
Depending on the model, the ER330 offers built-in harmonic suppression with a current distortion factor of less than 40 percent and complies with the requirements of IEC 61000-3-12. Built-in EMC filters simplify compliance-based design and reduce the need for additional components.
Main switch, potentiometer, and selector switch located directly on the unit.
For safe switching, stepless speed control, and a choice of Start/Stop or Left/0/Right.
Analog and digital inputs and outputs for easy system integration. Three relay outputs, Modbus RTU via terminals or RJ45, and an integrated STO function.
| Model designation | Rated Power ND / HD (kW) |
Continuous Output Current LV / HV (A at 380 V) |
Short-Time Current ND / HD, 60 s (A) |
Dimensions H × W × D (mm) |
Weight (kg) |
|---|---|---|---|---|---|
| ER330G IP55, EMC C2/C3 – 3-phase 380 to 480 V, 50/60 Hz | |||||
| ER330-0.75/4G-V1 | 0,75 / 0,37 | 2,2 / 1,5 | 2,4 / 2,3 | 375 × 189 × 247 | 4,5 |
| ER330-1.5/4G-V1 | 1,5 / 0,75 | 3,7 / 2,2 | 4,1 / 3,3 | 375 × 189 × 247 | 4,5 |
| ER330-2.2/4G-V1 | 2,2 / 1,5 | 5,1 / 3,7 | 5,6 / 5,6 | 375 × 189 × 247 | 4,5 |
| ER330-3.0/4G-V1 | 3,0 / 2,2 | 7,2 / 5,1 | 7,9 / 7,7 | 375 × 189 × 254 | 5,1 |
| ER330-4.0/4G-V1 | 4,0 / 3,0 | 9,1 / 7,2 | 10,0 / 10,8 | 375 × 189 × 254 | 5,1 |
| ER330-5.5/4G-V1 | 5,5 / 4,0 | 12 / 9,1 | 13,2 / 13,7 | 375 × 189 × 254 | 5,1 |
| ER330-7.5/4G-V1 | 7,5 / 5,5 | 16 / 12 | 17,6 / 18 | 427 × 234 × 266 | 7,3 |
| ER330-11.0/4G-V1 | 11 / 7,5 | 22,5 / 16 | 24,8 / 24 | 427 × 234 × 266 | 7,3 |
| ER330-15.0/4G-V1 | 15 / 11 | 30,5 / 22,5 | 33,6 / 33,8 | 427 × 234 × 266 | 7,9 |
| ER330-18.5/4G-V1 | 18,5 / 15 | 37 / 30,5 | 40,7 / 45,8 | 427 × 234 × 266 | 7,9 |
| ER330-22.0/4G-V1 | 22 / 18,5 | 46,3 / 39,2 | 50,9 / 58,8 | 728,4 × 263,4 × 301 | 20,6 |
| ER330-30.0/4G-V1 | 30 / 22 | 61,5 / 46,3 | 67,7 / 69,5 | 948,5 × 307 × 340 | 50,0 |
| ER330-37.0/4G-V1 | 37 / 30 | 74,5 / 61,5 | 82 / 92,3 | 948,5 × 307 × 340 | 50,0 |
| ER330-45.0/4G-V1 | 45 / 37 | 88 / 74,5 | 96,8 / 111,8 | 948,5 × 307 × 340 | 50,0 |
| ER330-55.0/4G-V1 | 55 / 45 | 106 / 88 | 116,6 / 132 | 1.261,5 × 361,8 × 375 | 87,0 |
| ER330-75.0/4G-V1 | 75 / 55 | 145 / 106 | 159,5 / 159 | 1.261,5 × 361,8 × 375 | 87,0 |
| ER330-90.0/4G-V1 | 90 / 75 | 173 / 145 | 190,3 / 217,5 | 1.261,5 × 361,8 × 375 | 87,7 |
Order of the dual ratings: Normal Duty / Heavy Duty. Continuous current ratings at 380 V.
|
PROTECTION CLASS AND ENVIRONMENT
IP55 / UL Type 12, integrated C2/C3 EMC filter
-15 to +40 degrees Celsius without power reduction Up to +50 degrees Celsius with power reduction 5 to 95 percent relative humidity without condensation Up to 1,000 m without power reduction |
CONTROL CONNECTIONS
3 analog inputs, 2 of which are for PTC, PT100, PT1000, or KTY84
2 programmable analog outputs: 0 to 10 V or 0/4 to 20 mA 6 programmable digital inputs 3 relay outputs and 2 STO safety inputs External 24-V power supply for control and communication |
STANDARDS AND APPROVALS
CE, UKCA, ATEX, IECEx, cULus, CSA, EAC, and KCC
IEC/EN 61800-5-1 and IEC/EN 61800-3 IEC 61000-3-12, IEC 61508, and ISO 13849-1 UL 61800-5-1 and UL 61800-5-2 Cybersecurity in accordance with IEC 62443-4-2, Security Level 1 |
| Model designation | Rated Power ND / HD (kW) |
Continuous Output Current LV / HV (A at 380 V) |
Short-Time Current ND / HD, 60 s (A) |
Dimensions H × W × D (mm) |
Weight (kg) |
|---|---|---|---|---|---|
| ER330K IP20 / IP00 – 3-phase 380 to 480 V, 50/60 Hz | |||||
| ER330-0.75/4K | 0,75 / 0,37 | 2,2 / 1,2 | 2,4 / 1,8 | 264 × 134 × 197 | 2,3 |
| ER330-1.5/4K | 1,5 / 0,75 | 3,7 / 2,2 | 4,1 / 3,3 | 264 × 134 × 197 | 2,3 |
| ER330-2.2/4K | 2,2 / 1,5 | 5,1 / 3,7 | 5,6 / 5,6 | 264 × 134 × 197 | 2,3 |
| ER330-3.0/4K | 3,0 / 2,2 | 7,2 / 5,1 | 7,9 / 7,7 | 334 × 178 × 230 | 3,4 |
| ER330-4.0/4K | 4,0 / 3,0 | 9,1 / 7,2 | 10,0 / 10,8 | 334 × 178 × 230 | 3,4 |
| ER330-5.5/4K | 5,5 / 4,0 | 12 / 9,1 | 13,2 / 13,7 | 334 × 178 × 230 | 3,4 |
| ER330-7.5/4K | 7,5 / 5,5 | 16 / 12 | 17,6 / 18 | 334 × 178 × 230 | 4,7 |
| ER330-11.0/4K | 11 / 7,5 | 22,5 / 16 | 24,8 / 24 | 334 × 178 × 230 | 4,7 |
| ER330-15.0/4K | 15 / 11 | 30,5 / 22,5 | 33,6 / 33,8 | 342 × 208 × 231 | 5,7 |
| ER330-18.5/4K | 18,5 / 15 | 37 / 30,5 | 40,7 / 45,8 | 342 × 208 × 231 | 5,7 |
| ER330-22.0/4K | 22 / 18,5 | 46,3 / 39,2 | 50,9 / 58,8 | 480 × 195 × 229 | 14,3 |
| ER330-30.0/4K | 30 / 22 | 61,5 / 46,3 | 67,7 / 69,5 | 597 × 210 × 265 | 28,0 |
| ER330-37.0/4K | 37 / 30 | 74,5 / 61,5 | 82 / 92,3 | 597 × 210 × 265 | 28,2 |
| ER330-45.0/4K | 45 / 37 | 88 / 74,5 | 96,8 / 111,8 | 597 × 210 × 265 | 28,7 |
| ER330-55.0/4K | 55 / 45 | 106 / 88 | 116,6 / 132 | 748 × 265 × 310 | 56,5 |
| ER330-75.0/4K | 75 / 55 | 145 / 106 | 159,5 / 159 | 748 × 265 × 310 | 58,0 |
| ER330-90.0/4K | 90 / 75 | 173 / 145 | 190,3 / 217,5 | 748 × 265 × 310 | 58,5 |
| ER330-110/4K | 110 / 90 | 211 / 173 | 232,1 / 259,5 | 852 × 316,6 × 390 | 82,0 |
| ER330-132/4K | 132 / 110 | 250 / 211 | 275 / 316,5 | 852 × 316,6 × 390 | 82,0 |
| ER330-160/4K | 160 / 132 | 302 / 250 | 332,2 / 375 | 852 × 316,6 × 390 | 82,0 |
| ER330-220/4K | 220 / 160 | 427 / 302 | 469,7 / 453 | 1.195,38 × 440 × 379,9 | 172,0 |
| ER330-250/4K | 250 / 200 | 481 / 387 | 529,1 / 580,5 | 1.195,38 × 598 × 379,9 | 203,0 |
Order of the dual ratings: Normal Duty / Heavy Duty. Continuous current ratings at 380 V.
|
PROTECTION CLASS AND ENVIRONMENT
IP20 from 0.75 to 22 kW, IP00 from 30 to 250 kW
Up to 160 kW: -15 to +50 degrees Celsius without derating 220 to 250 kW: -15 to +40 degrees Celsius without derating Up to +60 degrees Celsius with derating Up to 1,000 m without derating |
CONTROL CONNECTIONS
3 analog inputs, 2 of which are for PTC, PT100, PT1000, or KTY84
2 programmable analog outputs: 0 to 10 V or 0/4 to 20 mA 6 programmable digital inputs 3 relay outputs and 2 STO safety inputs External 24-V power supply for control and communication |
STANDARDS AND APPROVALS
CE, UKCA, ATEX, IECEx, cULus, CSA, EAC, and KCC
IEC/EN 61800-5-1 and IEC/EN 61800-3 IEC 61000-3-12, IEC 61508, and ISO 13849-1 UL 61800-5-1 and UL 61800-5-2 Cybersecurity in accordance with IEC 62443-4-2, Security Level 1 |
| Function | Benefits |
|---|---|
| Dual-PID Control | Control of multiple process variables, such as pressure, flow rate, or temperature |
| Fire and Emergency Operation | Defined operating strategies for smoke extraction, pressure maintenance, and safety-related ventilation functions. |
| Flap Control | Coordinated activation of flaps and actuators to reduce the number of external control components. |
| Underload Detection | Detects, for example, a broken V-belt, dry running, or a missing load. |
| Compressor Management | Supports typical requirements of refrigeration systems and scroll compressors. |
| Braking Circuit | Takes over a motor that is already rotating and reduces mechanical and electrical loads. |
| Cutoff Frequencies | Avoids critical resonance ranges of fans, pumps, and piping systems. |
| Performance Monitoring | Provides transparency into energy consumption and operating conditions. |
| Emergency Operation | Fire Mode and Forced Fire Mode for Smoke Exhaust and Emergency Applications |
The ER330 is BLEMO’s new series of variable-frequency drives for energy-efficient pump, fan, and compressor applications.
We’ll help you select the appropriate power rating, protection class, and communication features, and tailor the variable-frequency drive to your motor, system, and building management system.
Upon request, we can handle parameterization, control cabinet integration, commissioning, and optimization on-site.
The ER330 was developed specifically for heating, ventilation, air conditioning, and refrigeration applications. Typical applications include pumps, supply and exhaust fans, cooling towers, pressure-boosting systems, compressors, heat pumps, refrigeration units, and HVAC units.
The series covers motor power ratings from 0.75 to 250 kW with a three-phase supply of 380 to 480 V. The available power ratings and protection classes depend on the specific unit model.
The ER330 supports asynchronous motors, permanent magnet motors, synchronous reluctance motors, and BLDC motors. This allows the motor technology to be selected based on efficiency, noise levels, and system requirements.
Yes. Modbus RTU and BACnet MS/TP enable direct serial integration. For Ethernet-based building automation, BACnet/IP can be added via a communication module.
The ER330 already includes numerous functions for HVAC and refrigeration, such as dual PID, damper control, underload detection, compressor management, fire mode, and performance monitoring. As a result, fewer external control functions and components are required.
The ER330 is specifically designed for building, HVAC, and refrigeration applications and offers native BACnet communication as well as specialized functions for pumps, fans, and compressors. The ER41 is designed for a broader range of industrial process and machinery applications and also supports higher power ratings and additional industrial applications.
Yes. The ER330 supports special operating modes for safety-critical ventilation and smoke exhaust functions. The specific parameter settings must always be tailored to the system’s fire protection and safety plan.
The ER330 features STO (Safely Torque Off). This function supports safety concepts up to SIL 3 and Performance Level e. The final safety assessment is always performed for the entire machine or system.
Depending on power rating and model, devices are available for control cabinet installation in IP20 or IP21, built-in devices in IP00, and protected versions in IP55 / UL Type 12.
Yes. BLEMO provides support with product selection, motor sizing, communication connectivity, parameterization, control panel construction, and commissioning. Upon request, the ER330 can be delivered preconfigured to suit your application.
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