SCR-PM2 screw compressors: clearance of the compact range
Clearance of the last unitsThe SCR-PM2 range is being cleared. Its successor is the SCR-APM Maxi with the same power ratings, so if you are still choosing and not in a hurry, look there first. This page is for anyone the last units suit — the engineering in them is no worse, they are simply no longer built.
What made the PM2 unusual: the machine stands on its own 128 l receiver, oil is separated in one of its chambers and the whole package fits under 0.75 m² of floor. You set the pressure from 5 to 10 bar. The permanent-magnet motor above IE4 and the INOVANCE CP 700 inverter are the same technologies the successor range is built on.
What still holds up on the PM2
The receiver is part of the machine
The 128 l vessel is not bolted on beside it — the machine stands on it and labyrinth oil separation happens in one of its chambers. That is precisely why the whole package fits under 0.75 m² of floor.
Pressure set from 5 to 10 bar
Most machines have their pressure fixed. Here you bring it down to what the shop actually needs — and every bar down shows in consumption.
ALLY WIN airend
Designed in Germany, with international patents. It joins the motor directly through a tapered coupling, so there is nothing to lose in transmission.
IE4 motor with no bearings
Permanent magnets, oil cooling, IP65 protection. The PM motor design contains no bearings — one whole maintenance item disappears.
Pipes instead of hoses, cover tilts up
You will find no flexible hoses on the machine, only metal pipes — nothing to burst and nothing to replace years later. And when the service engineer arrives, the cover tilts up and he reaches everything from above: glycerine gauges, an oil sight glass on the outside, a door of its own for the oil change.
What is still available
| SCR-PM2 screw compressors — what is left | |||||||
|---|---|---|---|---|---|---|---|
| Model | Motor power | Control range | Receiver | Outlet | Noise | Weight | Status |
| SCR-7,5/10PM2 | 7.5 kW | 480 – 950 l/min | 128 l | 1/2" | 67 ± 3 dB(A) | 280 kg | clearance — 5 pcs |
| SCR-11/10PM2 | 11 kW | 750 – 1,500 l/min | 128 l | 3/4" | 69 ± 3 dB(A) | 320 kg | withdrawn from sale |
| SCR-15/10PM2 | 15 kW | 1,000 – 2,000 l/min | 128 l | 3/4" | 71 ± 3 dB(A) | 340 kg | clearance — 1 pcs |
All models: pressure adjustable from 5 to 10 bar, supply 400 V / 50 Hz. FAD measured to ISO 1217 annex C at 10 bar outlet pressure; noise quoted at 1 m from the machine. Ventilation required 1,260 m³/h on the 7.5 kW, 2,000 m³/h on the other two.
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Where the savings come from
38 % — the saving usually reached
The manufacturer counts it against a fixed-speed, V-belt driven compressor at 10 bar with a 270 l receiver.
up to 50 % — in favourable cases
The less air you draw, the larger the idle share would be on an ordinary machine — and the more the control pays off.
81 % — electricity share of the cost
Over ten years of operation you pay more than thirteen times as much for electricity as for the machine itself. The compressor price is 12 %, installation 6 %, maintenance 1 %.
| Annual electricity cost from the manufacturer catalogue | |||
|---|---|---|---|
| Motor power | 1,000 MH | 2,000 MH | 4,000 MH |
| 7.5 kW | 46,000 Kč | 92,000 Kč | 184,000 Kč |
| 11 kW | 68,000 Kč | 136,000 Kč | 272,000 Kč |
| 15 kW | 85,000 Kč | 170,000 Kč | 340,000 Kč |
The manufacturer model calculation for a fixed-speed, V-belt driven compressor at 10 bar with a 270 l receiver, a 1.5 bar switching differential and electricity at CZK 4/kWh. MH = running hours per year. It shows the size of the prize when consumption drops.
How that saving is made
The ALLY WIN airend joins the motor directly through a tapered coupling — no belts, no gearbox, so nothing to lose in transmission. The permanent-magnet motor exceeds IE4 under IEC EN 60034, oil cools it and it has no bearings.
The INOVANCE CP 700 inverter holds the speed to actual demand. That removes idle running — the state where a fixed-speed machine no longer makes air but the motor keeps turning the airend and drawing power. The less air you take, the larger the idle share would be on an ordinary machine.
Operation and maintenance
The machine is run by the SOP-20 electronic controller with a monochrome display and buttons. It watches the operating state, reports service needs and offers user settings including the outlet pressure.
Every part is reached through the tilting cover from above. The gauges are glycerine-filled, the oil sight glass is on the outside and the oil is changed through its own door. What maintenance involves is covered in How and why to service a compressor properly.
When the PM2 is not enough, or runs out
Who the clearance suits
You have a tight compressor room, you need a finished machine with the vessel included and you do not want to wait for delivery. The last units are in stock.
Who should take the successor
You are building an air supply for the next ten years, you want the dryer and filtration straight from the manufacturer, or you need a 270 or 500 l receiver. That is a job for the SCR-APM Maxi.
Who needs less air
Below 480 l/min the SCR-APM Mini range starts — from 3.6 kW, with the same engineering in a smaller form.
Ventilek advises
Clearance is not a discount on quality, it is the end of replacement machines. Service, spare parts and SCR oils for the PM2 all continue — it is still a living brand, only this particular range has ended. What you will not get is the same machine in two years when you expand. If you are planning two compressors side by side, buy two from the successor range straight away.
Frequently asked questions
- Why is the range being cleared?
- The manufacturer replaced it with the SCR-APM Maxi range at the same 7.5, 11 and 15 kW ratings. The 11 kW SCR-11/10PM2 is already withdrawn from sale; on the 7.5 and 15 kW we are clearing the last units.
- Do clearance machines carry a warranty?
- Yes, the same as new ones — two years as standard, extendable to five years as a paid option with the machine. The extension is not capped by running hours and needs no service contract.
- Will I get service and spare parts for the PM2?
- Yes. SCR is still a living brand and the service network along with parts and SCO oil supply continue. Only the production of these particular machines has ended.
- How does the PM2 differ from the successor range?
- The PM2 is a compact all-in-one: it stands on its own 128 l receiver, oil is separated inside the vessel and the machine takes under 0.75 m². The SCR-APM Maxi is a kit — a 270 or 500 l receiver, optionally a dryer and three-stage filtration, but a larger footprint too. The PM2 also has adjustable 5–10 bar pressure, while the Maxi runs at 10 bar.
- How much can really be saved?
- The manufacturer quotes 38 % as usual and up to 50 % in favourable cases against a fixed-speed compressor. The saving grows the more demand fluctuates — on a fixed-speed machine the idle share grows with it. More in Compressor energy consumption.
- What happens when the last units are gone?
- Then the SCR-APM Maxi remains, and the SCR-APM Mini for smaller consumption. We carry both ranges in stock and to order.
Product sorting
List of products
Genuine high quality mineral oil for SCR screw compressors in a 20 l canister. For oil change of SCR brand screw compressors - Shanghai Screw Compressor Co., Ltd
Innovative and economical small screw compressor for up to 50% energy savings. Maximum output 2 000 l/min at 10 bar. Continuous speed control by frequency converter, direct 1:1...
Innovative and economical small screw compressor for up to 50% energy savings. Maximum output 950 l/min at 10 bar. Continuous speed control by frequency converter, direct 1:1...
Genuine high quality mineral oil for SCR screw compressors in a 5 l canister. For oil change of SCR brand screw compressors - Shanghai Screw Compressor Co., Ltd
Genuine high quality mineral oil for SCR screw compressors in 209 l drum. For oil change of SCR brand screw compressors - Shanghai Screw Compressor Co., Ltd
Innovative and economical small screw compressor SCR-11/10PM2 for saving up to 50% of electricity. Maximum output 1 500 l/min at 10 bar. Continuous speed control by frequency...