EP-CMW13.5-1.0 Oil-Free Scroll Air Compressor

EP-CMW13.5-1.0: Why the Three-Head Architecture Changes Your Compressed Air Running Cost

Most compressed air system discussions start with maximum demand. This one starts with the gap between maximum demand and average demand -- because that gap is where energy is wasted. A facility that needs 1230 L/min during peak three-shift production rarely needs the same volume overnight, on weekends, or between production runs. A single large compressor running to cover peak demand burns the same electricity at 30% utilisation that it does at 100%. The EP-CMW13.5-1.0 is designed to close that gap.

Three 4.5 kW scroll air-ends in a single managed cabinet give this unit three distinct operating levels: 410 L/min on one head, 820 L/min on two, or the full 1230 L/min on all three -- each at up to 1.0 MPa. The touch-screen PLC selects the appropriate level automatically in response to real-time system pressure, transitioning between stages without operator input. For facilities with variable shift patterns, seasonal demand cycles, or mixed production schedules, this three-stage response is not a convenience feature -- it is the mechanism by which compressed air electricity consumption tracks actual production activity rather than running ahead of it. Compare all output levels across the full EP-CMW 1.0 MPa range.

The Three-Stage Demand Response: What It Means for Your Energy Bill

Consider a pharmaceutical facility with this demand profile: overnight (10 pm to 6 am) building services and HVAC pneumatics draw roughly 380 L/min. Single-shift granulation and tablet press operations (6 am to 2 pm) consume around 790 L/min. Peak double-shift production including packaging and coating (2 pm to 10 pm) reaches 1180 L/min. A conventional single large compressor sized for peak demand runs at approximately 31% capacity overnight, 64% during single-shift, and near full load in the evening. Across a 24-hour cycle, it consumes power roughly proportional to its rated output regardless of actual demand.

The practical energy saving varies with the actual demand profile of your facility. Plants with significant off-peak periods -- common in food manufacturing, pharmaceutical production, and multi-shift industrial coating -- consistently report that three-stage demand management reduces compressed air electricity consumption by 25 to 40 percent compared to running a single fixed-speed machine sized for peak demand. That saving compounds over the equipment lifetime. At industrial electricity tariffs common in the EU and Australia, a 30% reduction on 13.5 kW of compressor power across an 8,000-hour annual operating period represents a substantial contribution to the total cost of ownership calculation.

This is also where the 1.0 MPa working pressure adds further value. At 0.8 MPa, facilities often oversize their compressor to ensure adequate pressure headroom at peak demand. At 1.0 MPa working pressure, the EP-CMW13.5-1.0 provides 0.2 MPa of headroom above standard 0.8 MPa-rated equipment -- meaning downstream regulators can be set accurately without approaching the supply pressure ceiling, and pressure consistency is maintained even as the PLC transitions between one, two, and three heads.

Two Levels of Built-In Redundancy: Rethinking Maintenance Downtime

Most compressed air maintenance discussions frame the question as: when does the compressor stop? With the EP-CMW13.5-1.0, the question becomes: which head is being serviced today, and what is the remaining capacity? With three heads, the unit maintains two active heads -- 820 L/min at 1.0 MPa -- while the third undergoes maintenance. For most industrial facilities, 820 L/min covers off-peak and single-shift production without any process adjustment. This is a structural change in how compressed air maintenance is planned and resourced.

The PLC touch-screen tracks cumulative running hours for each of the three heads independently and displays individual maintenance reminders on separate indicators. Because the automatic lead rotation algorithm cycles each head through primary, secondary, and standby roles over time, all three heads approach their maintenance intervals simultaneously -- simplifying the service planning into predictable, evenly spaced events rather than staggered, unpredictable individual head failures.

1.0 MPa at 1230 L/min: The Technical Case for Higher Pressure at Scale

Scaling compressed air volume while maintaining 1.0 MPa working pressure requires more than simply connecting larger motors. The compression ratio at 1.0 MPa is meaningfully higher than at 0.8 MPa, and scroll head efficiency at this ratio depends on the precision of the scroll geometry, the quality of the tip seal material, and the stiffness of the housing that maintains scroll profile tolerances under thermal and mechanical cycling. Each of the three 4.5 kW scroll heads in the EP-CMW13.5-1.0 uses scroll profiles and tip seal specifications developed for 1.0 MPa continuous service -- not adapted from 0.8 MPa geometry with increased motor power added to compensate.

This matters most at the extremes of the operating envelope: when ambient temperature is high, when the compressor has been running for extended hours, and when all three heads are operating simultaneously at full load. The high-stiffness square air-end housing -- the same design that enabled Ever Power to achieve the world's first 1.2 MPa oil-free scroll compressor -- maintains scroll geometry integrity under these conditions, preserving volumetric efficiency and the 1230 L/min rated output at 1.0 MPa across the full operating range. All three air-ends carry a 2-year warranty.

The compression cycle in each head follows the same orbital scroll mechanics across the CMW range. Air enters at the scroll periphery and is sealed into crescent-shaped pockets between the fixed and orbiting scrolls. As the orbiting scroll traces its circular path, these pockets travel inward through a longer compression path than in 0.8 MPa models -- the additional path length achieves the higher compression ratio needed for 1.0 MPa output without increasing scroll head size. Three heads discharge simultaneously into a common stainless steel manifold, producing a combined 1230 L/min of oil-free, pulse-free air at the 1-inch stainless outlet.

Where the EP-CMW13.5-1.0 Is the Right Answer -- and Where It Is Not

High-capacity oil-free scroll compressors are not the right answer for every application. This section maps the EP-CMW13.5-1.0 against the three application profiles where it consistently delivers the best outcome, and identifies the configurations where a different EP-CMW model would be more appropriate.

Technical Specifications

Customer Case Studies

Frequently Asked Questions -- EP-CMW13.5-1.0

The Total Cost of Ownership Conversation

Compressed air equipment decisions are rarely made on purchase price alone -- but the running cost component of that decision is often underweighted because it requires assumptions about future demand patterns and energy tariffs. The EP-CMW13.5-1.0 makes that calculation more favourable in two ways: three-stage demand management directly reduces electricity consumption in proportion to the gap between your peak and average demand, and two-level maintenance redundancy reduces the cost of unplanned downtime to near zero. For facilities where compressed air is a significant operational cost, both components deserve quantification before selecting a system.

Ever Power's engineering team can assist with application sizing, energy consumption estimates based on your demand profile, and configuration guidance for both standard and custom installations. Learn more about Ever Power's engineering and manufacturing background, or review the full EP-CMW product range to compare capacity and pressure options.