EP-CM11PVF Variable Frequency Water-Lubricated Oil-Free Screw Air Compressor

EP-CM11PVF Variable Frequency Water-Lubricated Oil-Free Screw Air Compressor

The EP-CM11PVF is an 11 kW permanent magnet VSD water-lubricated oil-free screw compressor delivering 0.48–1.55 m³/min at 0.8–1.25 MPa — combining 35% greater output than the entry VSD model with the same 58 dB(A) noise floor, purpose-built for cleanroom pressurisation, electronics test floors, and precision manufacturing environments where demand varies and pressure stability is critical.

SKU: EP-CM11PVF Category: Tags: , , , ,

EP-CM11PVF | 11 kW VSD Water-Lubricated Oil-Free Compressor — Stable Pressure, Variable Energy

Cleanrooms, electronics test floors, and precision manufacturing cells share a compressed air demand characteristic that makes fixed-frequency compressors a structural mismatch: their air consumption varies continuously and unpredictably, driven by the production cycle, the test programme, and the occupancy of the controlled environment. A cleanroom pressurisation system draws more air when doors cycle frequently and less during low-activity periods. An electronics test floor draws more air when multiple test programs run simultaneously and less when stations are in setup or idle states. For these applications, the right compressor technology is one that tracks this variable demand precisely — neither over-supplying and wasting energy, nor under-supplying and losing pressure.

The EP-CM11PVF is built for this operating profile. At 11 kW (15 HP) with a variable free air delivery of 0.48–1.55 m³/min at 0.8 MPa, its permanent magnet VSD continuously adjusts output to match demand, maintaining system pressure within ±0.1 MPa at every operating point. The water-lubricated single-screw compression mechanism — producing structural ISO 8573-1 Class 0 oil-free air at the same 58 dB(A) noise level as the entry model — is unchanged. What the 11 kW VSD adds is 35% more maximum output than the entry model and the energy intelligence to deliver exactly what the cleanroom or test floor needs, at exactly the moment it needs it. Compare all CMPV series configurations on our products page.

EP-CM11PVF 11kW VSD water-lubricated oil-free screw compressor cleanroom electronics test floor

Technical Specifications

Parameter 0.8 MPa 1.0 MPa 1.25 MPa
Motor Power 11 kW / 15 HP (PM VSD) 11 kW / 15 HP (PM VSD) 11 kW / 15 HP (PM VSD)
FAD range (m³/min) 0.48–1.55 0.53–1.32 0.48–1.02
FAD range (cfm) 17–55 19–47 17–36
Noise Level 58 dB(A) 58 dB(A) 58 dB(A)
Weight W-cooled 650 kg 650 kg 650 kg
Weight A-cooled 520 kg 520 kg 520 kg
Drive Type Permanent magnet VSD Permanent magnet VSD Permanent magnet VSD
Motor Efficiency ≥94% (IE4 class) ≥94% (IE4 class) ≥94% (IE4 class)
Pressure Band Control ±0.1 MPa ±0.1 MPa ±0.1 MPa
Air Quality ISO 8573-1 Class 0 ISO 8573-1 Class 0 ISO 8573-1 Class 0
Lubrication Pure water — zero oil Pure water — zero oil Pure water — zero oil

VSD vs Fixed-Frequency: The Energy Economics

Cost Category Fixed-Frequency Model Variable Frequency (VSD) Model
Energy (10-year share) ~80% of total ownership cost ~45% — 35% electricity saving
Purchase cost Lower Slightly higher (VSD premium)
Startup current High inrush — grid stress Soft-start — zero inrush
Partial-load efficiency Full power even at 40% demand Speed reduces proportionally
Pressure band control ±2–3 bar (on/off cycling) ±0.1 MPa continuous
Payback on VSD premium — Typically 12–24 months

EP-CM11PVF VSD water-lubricated compressor cleanroom pressurisation electronics manufacturing energy saving

Key Features

35% More Output Than Entry VSD

At 1.55 m³/min peak FAD at 0.8 MPa, the EP-CM11PVF supplies cleanroom pressurisation systems, electronics test floors with multiple simultaneous test stations, or precision manufacturing cells with more than one production workstation — while maintaining the same 58 dB(A) noise level and identical structural Class 0 oil-free air quality as the 7.5 kW entry model.

VSD Trim Control Compatibility

The EP-CM11PVF can operate as the trim control compressor in a hybrid system alongside a fixed-frequency base load unit. The VSD absorbs demand variation that the fixed-frequency unit cannot handle, maintaining tight pressure control while the base unit runs at constant high efficiency. The 485 interface enables external master controller coordination.

IE4 Permanent Magnet Motor

The permanent magnet synchronous motor maintains ≥94% efficiency across the VSD speed range — from minimum to maximum output. This flat efficiency curve is the fundamental advantage of permanent magnet technology over standard asynchronous motors, which lose efficiency rapidly at partial speed. The EP-CM11PVF operates at near-peak motor efficiency even when demand is at 50% of maximum.

±0.1 MPa Pressure Stability

Continuous speed adjustment from the VSD controller maintains system pressure within ±0.1 MPa of the setpoint — ten times tighter than the typical ±1–2 bar band of fixed-frequency load/unload control. For electronics test fixtures where pneumatic actuation pressure affects test repeatability, this pressure stability is a directly measurable quality improvement.

58 dB(A) Across Full Speed Range

The acoustic characteristics of the single-screw water-lubricated design — smooth orbital compression, direct motor drive, no belt or gear transmission noise — maintain 58 dB(A) consistently across the VSD speed range. There is no characteristic low-frequency hum at reduced speed that would be audible in cleanroom or test floor adjacent areas.

Water Lubrication — Cleanroom Compatible

No oil-contaminated condensate is generated. No downstream oil filtration equipment is required adjacent to the cleanroom. All internal air path surfaces are stainless steel. The structural Class 0 certification requires no ongoing filter maintenance programme — simplifying the compressed air quality documentation for ISO-certified cleanroom operations.

EP-CM11PVF VSD water-lubricated compressor installed cleanroom pharmaceutical precision manufacturing

Customer Case Studies

Germany — ISO Class 6 Medical Device Cleanroom

Industry: Medical Device Manufacturing  |  Application: Pressurisation and process air for an ISO Class 6 cleanroom producing surgical instruments

"Our cleanroom pressurisation demand varies significantly between production shifts and maintenance periods. The EP-CM11PVF's VSD precisely tracks these variations — during maintenance windows when the cleanroom is depopulated, the compressor reduces to minimum speed and our electricity consumption from the compressed air system drops by more than half. The structural Class 0 certification satisfies our ISO 13485 quality management requirement for cleanroom process air without an ongoing filter maintenance programme."

★★★★★

Japan — Semiconductor Component Test Floor

Industry: Electronics Testing  |  Application: Compressed air for pneumatic test fixtures on a multi-station semiconductor component functional test floor

"Our test floor runs 18 different test programs across 24 stations, each drawing different air volumes at different cycle times. The demand profile is highly variable and largely unpredictable from the compressor's perspective. The EP-CM11PVF handles this through continuous VSD speed adjustment — our pressure has never dropped below the ±0.1 MPa band in six months of operation, and our test fixture repeatability has improved measurably since we eliminated the pressure variation from the fixed-frequency cycling."

★★★★★

South Korea — Precision Optics Manufacturing Cell

Industry: Precision Optics  |  Application: Oil-free compressed air for lens polishing spindles, anti-reflection coating air curtains, and pneumatic assembly tools

"Optical coating processes are sensitive to both oil contamination and pressure variation — oil causes adhesion failure, pressure variation causes coating thickness non-uniformity. The EP-CM11PVF eliminates both risks: structural Class 0 oil-free air from water lubrication, and ±0.1 MPa pressure stability from VSD control. Our coating adhesion rejection rate has dropped to zero since installation, and our annual compressed air electricity cost is 26% lower than with our previous fixed-frequency oil-free unit."

★★★★★

Frequently Asked Questions

How does the EP-CM11PVF improve pressure stability on an electronics test floor versus a fixed-frequency compressor?
On an electronics test floor where multiple test stations cycle independently, compressed air demand fluctuates unpredictably as test programs start and stop. A fixed-frequency compressor responds to these fluctuations with load/unload cycling, producing pressure variations of ±2–3 bar that can affect pneumatic test fixture repeatability. The EP-CM11PVF's VSD maintains pressure within ±0.1 MPa by continuously adjusting speed — eliminating the pressure variation that causes test result scatter in sensitive pneumatic test applications.
What is the energy saving profile of the EP-CM11PVF in a cleanroom pressurisation application?
Cleanroom pressurisation demand varies with the number of people in the cleanroom, the frequency of air lock cycling, and the production activity level. During off-shift hours, pressurisation demand drops significantly. The EP-CM11PVF reduces speed proportionally during these low-demand periods, consuming 40–60% less electricity than at full production speed. In cleanroom environments with significant off-shift periods, annual energy savings of 25–30% versus a fixed-frequency compressor are typical.
Does the VSD system on the EP-CM11PVF require any special electrical installation?
The VSD inverter drive is integrated within the EP-CM11PVF's enclosure — no external drive cabinet is required. Standard three-phase industrial electrical connection is all that is needed. The soft-start function of the VSD eliminates the need for a star-delta or auto-transformer starter that some fixed-frequency compressors of this size require, simplifying the electrical installation.
Can the EP-CM11PVF be used in a multi-compressor system with a fixed-frequency base load unit?
Yes. A common configuration combines a fixed-frequency compressor for base load and a VSD compressor for trim control — the fixed unit handles constant demand and the VSD unit adjusts its output to match the remaining variable demand. The EP-CM11PVF can serve the trim control role in such a system, maintaining tight pressure control while the fixed unit runs at constant efficiency. The 485 interface enables coordination with a master compressor controller.
How does water lubrication benefit cleanroom applications specifically?
In cleanrooms, both air quality and low particle generation are controlled parameters. The EP-CM11PVF's water-lubricated design produces no oil-contaminated condensate — eliminating the oil waste stream from the cleanroom utility area entirely. The all-stainless-steel internal air path produces no rust or scale particles. The structural Class 0 oil-free certification requires no downstream oil filtration equipment adjacent to the cleanroom, reducing the potential for particulate generation from filter element handling in the clean environment.

Variable Demand. Stable Pressure. Minimum Energy.

Cleanroom operators, electronics test facilities, and precision manufacturers in Germany, Japan, South Korea, and 50+ markets choose the EP-CM11PVF to deliver structural Class 0 oil-free air with VSD energy intelligence. Contact our team to model your facility's demand profile and calculate the expected energy saving.

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