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11 kW Direct-Drive Variable-Speed Screw Compressor

Tanair TAN-S 11 VSD: 46 CFM at 10 Bar

A direct-drive permanent-magnet VSD screw compressor for correctly sized workshop and industrial applications where compressed-air demand changes during the working day.

11 kW
46 CFM
10 Bar
415V Three Phase
Direct-Drive PM VSD

What the TAN-S 11 VSD Is Designed to Do

The Tanair TAN-S 11 VSD is an 11 kW, air-cooled rotary screw compressor with permanent-magnet variable-speed control. Its current published output is 46 CFM (1.3 m³/min) at up to 10 bar on a 415V, 50 Hz, three-phase supply.

It is most relevant where air demand changes across different tools, machines, bays, shifts or production processes. In those conditions, variable-speed control can reduce unnecessary unloaded running compared with a fixed-speed compressor that would otherwise operate at full speed and cycle between load states.

Important: 11 kW is not a sizing rule. The compressor should be selected from the actual airflow required at the genuine working pressure, along with duty, operating hours, electrical supply and downstream air-treatment requirements.

Current Technical Specification

SpecificationTAN-S 11 VSD
Motor power11 kW (15 HP)
Published airflow46 CFM / 1.3 m³/min
Maximum pressure10 bar
Electrical supply415V / 50 Hz / 3 phase
DriveDirect-drive permanent-magnet VSD
CoolingAir cooled
Motor protectionIP55
Published dimensions112 cm × 74 cm × 105 cm
Published weight300 kg
Tanair TAN-S 11 VSD 11 kW direct-drive variable speed screw air compressor

Why Variable Speed Can Be Useful

Changing Demand

The inverter adjusts motor speed as compressed-air demand rises and falls. This can reduce time spent running at full output when the site does not need full compressor capacity.

Pressure Control

Variable-speed control can help maintain system pressure across a changing load profile, provided the compressor and distribution system are correctly sized and configured.

Energy-saving claims need context: the product page references potential savings up to 35% versus fixed speed, but that is not a guaranteed result. Actual savings depend on load profile, annual running hours, pressure, leakage, controls and how well the compressor is matched to demand.

Direct Drive: What It Changes

No Drive Belts The direct-drive arrangement removes belt inspection, retensioning and replacement from the transmission maintenance schedule.
Fewer Transmission Components The motor connects directly to the compression element rather than through a belt-drive stage.
Still Requires Servicing Direct drive reduces belt-related maintenance, but oil, filters, separator elements, coolers and other compressor service items remain.

Where the 46 CFM Output May Fit

The TAN-S 11 VSD may suit sites where the realistic simultaneous demand fits within its 46 CFM output at the required working pressure and the demand pattern varies enough to benefit from variable-speed control.

Engineering WorkshopsWhere pneumatic tools or machines start and stop at different times and total demand changes across the day.
CNC & FabricationWhere individual machines have defined compressed-air requirements and the combined demand varies by job or shift.
Automotive WorkshopsPotentially suitable for multi-bay environments where actual simultaneous tool demand has been checked.
Light ManufacturingFor production areas requiring up to the compressor's usable airflow with a changing load profile.
Machine SupportWhere several pneumatic functions create a variable rather than permanently full-load demand.
Replacement ProjectsA candidate where an existing 11 kW-class machine is being reviewed, provided the real airflow and pressure requirement is confirmed rather than assumed.

When an 11 kW VSD May Not Be the Right Choice

  • Your measured peak demand regularly exceeds 46 CFM at the required pressure.
  • Your air demand is very steady and consistently high, where a correctly sized fixed-speed compressor may be commercially appropriate.
  • The compressor would be substantially oversized for normal demand.
  • The site only has 230V single-phase power.
  • The real system problem is excessive leakage, undersized pipework or unnecessary pressure rather than compressor control.

Electrical Supply: Confirm the Exact Installation

The live article previously gave a fixed 63A Type D breaker and minimum 16 mm² cable recommendation. Those values should not be published as universal installation instructions because protective-device selection and conductor sizing depend on the exact machine data, cable route, installation method, length, ambient conditions and applicable electrical design.

  • Provide a 415V / 50 Hz / three-phase supply.
  • Use the exact compressor electrical data when selecting cable and protection.
  • Provide suitable local isolation.
  • Check voltage drop, installation method and starting/current characteristics.
  • Have the final electrical design and connection completed by a suitably competent electrician.
Dryer supply: if a separate refrigerated dryer is installed, confirm its own electrical requirements rather than assuming it is supplied from the compressor circuit.

Ventilation and Plant-Room Layout

The TAN-S 11 VSD is air cooled, so the installation must allow the compressor to take in suitable cooling air and reject heat without recirculating excessively hot air back into the cabinet.

Allow Service Access

Leave enough clearance to open panels, remove filters and separator components, clean coolers and carry out routine servicing safely.

Manage Compressor Heat

Plant-room ventilation should be designed around the heat rejected by the compressor and any dryer or ancillary equipment in the room.

Air Receiver, Dryer and Filtration

The floor-mounted compressor is only one part of the compressed-air system. Depending on the process, a complete installation may also need an air receiver, refrigerated dryer, filtration, drains and condensate treatment.

Maintenance Requirements

Direct drive removes belt-related service items, but the TAN-S 11 VSD is still an oil-injected rotary screw compressor and needs planned maintenance.

Compressor Service Items

  • Compressor oil
  • Oil filter
  • Air intake filter
  • Oil separator element
  • Cooler cleaning and inspection

System Service Items

  • Automatic drains
  • Dryer servicing
  • Downstream filter elements
  • Air receiver inspection requirements
  • Condensate-treatment equipment

How to Assess ROI Properly

Do not compare VSD and fixed-speed machines using motor kW alone. A useful ROI assessment needs operating hours, actual demand variation, current loaded/unloaded behaviour, pressure setting and electricity cost.

  • Record annual compressor operating hours.
  • Establish peak, average and minimum airflow where possible.
  • Check how much time the existing compressor spends unloaded.
  • Review whether pressure can be reduced after addressing system pressure losses.
  • Include maintenance and installation differences as well as electricity use.

Compare the Tanair VSD Range

Related Guides

TAN-S 11 VSD FAQs

How much air does the TAN-S 11 VSD deliver?

The current published output is 46 CFM (1.3 m³/min) at up to 10 bar.

What electrical supply does it need?

It requires a 415V, 50 Hz, three-phase supply. Cable size, protective device and local isolation should be selected from the exact machine data and the site's electrical installation by a suitably competent electrician.

Does the 11 kW VSD save 20–35% energy?

It can reduce energy use significantly in suitable variable-demand systems, but a fixed 20–35% saving should not be presented as typical or guaranteed. Actual savings depend on the site's load profile, operating hours, pressure, leakage and current compressor behaviour.

Is the TAN-S 11 VSD maintenance-free?

No. Direct drive removes belts and belt tensioning, but routine servicing of oil, filters, separator elements, coolers and other compressor components is still required.

Is it suitable for continuous duty?

Rotary screw compressors are commonly used in high-duty industrial applications, but the correct operating duty for the TAN-S 11 VSD should be confirmed against the manufacturer's instructions, site conditions and actual load profile rather than relying on a blanket “continuous duty” claim.

Can it replace an existing 11 kW fixed-speed compressor?

Possibly, but motor size alone is not enough to confirm suitability. Compare the existing machine's delivered airflow, pressure, operating hours and load profile with the TAN-S 11 VSD's 46 CFM output.

Can I add a dryer and filters?

Yes, where the application requires dry or filtered compressed air. The dryer and filters should be sized for actual airflow, operating conditions and the required air quality.

How much does the TAN-S 11 VSD cost?

Use the live product page for the current price and availability rather than relying on a price embedded in an advice article, as pricing and stock can change.

Is 46 CFM the Right Size for Your Site?

Tell us your current compressor, required pressure, operating hours and which tools or machines run together. We can help assess whether the TAN-S 11 VSD is correctly sized and what receiver, dryer and filtration may be needed around it.

Compressed Air Systems UK · Unit 15, Fortnum Close, Birmingham, B33 0LG

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