Permanent Magnetic VSD Screw air compressor EPM2 series

EPM2 Industrial Screw Air Compressors with Permanent Magnet Motors

The EPM2 series combines permanent magnet motors with variable speed control, allowing compressor output to adapt to actual compressed air consumption. Instead of operating continuously at maximum speed, the system changes motor speed according to the current air delivery required by the production process.

This is particularly important in large industrial installations where the number of operating machines and the production load change between shifts. When consumption decreases, the compressor can reduce its output. When demand increases, the control system raises motor speed within the operating range of the selected model.

A correctly sized variable speed compressor can reduce unloaded operation, limit pressure fluctuations and provide a better balance between generated and actually consumed compressed air.

Models from 55 to 160 kW

The EPM2 series includes seven main power ratings:

• SCR75EPM2 – 55 kW;
• SCR90EPM2 – 63 kW;
• SCR100EPM2 – 75 kW;
• SCR125EPM2 – 90 kW;
• SCR150EPM2 – 110 kW;
• SCR180EPM2 – 132 kW;
• SCR220EPM2 – 160 kW.

The SCR75EPM2 and SCR90EPM2 are suitable for production systems with medium to high compressed air demand. The SCR100EPM2 and SCR125EPM2 can supply larger production areas and groups of machines, while the SCR150EPM2, SCR180EPM2 and SCR220EPM2 are intended for large central compressor installations and facilities with high continuous consumption.

Selection should not be based on motor power alone. Required air delivery at the actual working pressure, peak demand, operating profile and future production expansion must also be analysed.

Free Air Delivery from 2.6 to 33.5 m³/min

The overall free air delivery range of the EPM2 series is 2.6 to 33.5 m³/min. Actual output depends on motor power and the selected working pressure configuration.

The 55 kW SCR75EPM2 provides up to 12.5 m³/min at 7 bar. The 90 kW SCR125EPM2 delivers up to 20.0 m³/min, while the largest SCR220EPM2 model reaches up to 33.5 m³/min at 7 bar.

Maximum air delivery decreases as working pressure increases. For example, the SCR220EPM2 provides up to 33.5 m³/min at 7 bar, 31.0 m³/min at 8 bar and 27.0 m³/min at 10 bar.

The compressor should therefore be selected according to the required combination of air delivery and pressure rather than only the maximum value available for a given power rating.

Working Pressure of 7, 8 or 10 Bar

All EPM2 models are available in configurations for 7, 8 and 10 bar. This range covers the requirements of many standard industrial pneumatic systems.

The lowest pressure at which the production equipment operates reliably should normally be selected. Pressure losses through pipelines, filters, dryers, valves and other system components must also be considered.
Setting the system pressure higher than necessary can increase electricity consumption and reduce available air delivery.

Advantages of VSD Control in Large Compressors

With high compressor power, differences between generated and consumed air can create significant energy losses. Variable speed control allows output to follow current demand more closely.

The main advantages include:

• motor speed adjustment according to load;
• more stable pressure across the air network;
• reduced unloaded operation;
• fewer load and unload cycles;
• smoother motor starting;
• adjustment to different production shifts;
• improved management of fluctuating air demand.

Actual performance depends on correct compressor sizing, the condition of the compressed air network and the settings of the complete system.

Applications of EPM2 Screw Air Compressors

The EPM2 series is intended for large industrial consumers and central compressed air installations. Typical applications include:

• automotive production and component manufacturing;
• metal processing and metallurgical facilities;
• large CNC production departments;
• automated manufacturing lines;
• mechanical engineering;
• packaging and bottling installations;
• chemical and processing industries;
• centralised compressed air systems;
• facilities operating multiple production shifts.

For applications with specific compressed air quality requirements, suitable dryers, filters, air receivers and condensate management systems should be included.

DN50, DN65 and DN80 Connection Sizes

The SCR75EPM2 and SCR90EPM2 models use DN50 connections. The SCR100EPM2 and SCR125EPM2 use DN65, while the SCR150EPM2, SCR180EPM2 and SCR220EPM2 are equipped with DN80 outlets.

Pipeline diameter should be selected according to air delivery, installation length and the permitted pressure drop. Undersized pipework can create significant losses and limit the efficiency of the entire compressed air system.

How to Select the Correct EPM2 Compressor

Determine Average and Maximum Air Demand
Calculate the total consumption of all equipment that may operate simultaneously. In large facilities, actual air flow measurements across different production shifts are recommended.

Analyse the Load Profile
Variable speed control provides the greatest benefit when compressed air demand changes. If the system operates almost continuously at maximum load, different compressor configurations should be compared.

Match Air Delivery to Working Pressure
Technical values must be compared at the actual operating pressure. Air delivery stated at 7 bar should not be used to size a system that requires 10 bar.

Allow for Reserve Capacity and Future Expansion
A reasonable reserve supports new equipment and temporary consumption peaks. Excessive oversizing, however, can result in operation outside the optimum working range.

Check Installation Conditions
Large compressor models require adequate space, reliable ventilation, a suitable foundation and sufficient service access. Dimensions, weight and the transport route to the installation location should all be assessed.

Designing a Central Compressed Air System
In large industrial facilities, compressor selection should form part of the complete system design. In addition to the main compressor, the required air receiver, dryer, filters, pipework and condensate drainage equipment must be specified.

For critical production processes, several compressors may be combined to provide redundancy and more flexible control according to changing demand.
Consultation for Industrial Screw Air Compressor Selection

Accurate selection requires information about average and peak consumption, working pressure, the number of production shifts, the type of connected equipment and future expansion plans.

Contact our team for technical consultation and assistance in selecting an EPM2 series industrial screw air compressor according to the requirements of your compressed air system.

Frequently Asked Questions

What is the power range of the EPM2 series?

The series includes compressors from 55 to 160 kW, corresponding approximately to 75–220 HP.

What is the maximum free air delivery?

The maximum stated free air delivery is 33.5 m³/min for the SCR220EPM2 model at 7 bar.

Are models available for pressures above 10 bar?

No. The listed EPM2 compressors are available for 7, 8 and 10 bar.

What type of facilities is the EPM2 series suitable for?

The series is suitable for large manufacturing facilities, central compressed air systems and installations with high or fluctuating demand.

How does air delivery change at higher pressure?

Maximum air delivery decreases as working pressure increases. The specific values are listed in the technical table for each model.

Can several compressors be used in one system?

Yes. Large installations can combine multiple compressors to provide redundancy, flexible load control and staged operation according to demand.