SIGNAIR ASC7-10-200 Compressor

1. Purpose and Operating Principle

The compressor element is screw-type, with direct permanent-magnet drive (PM motor) and frequency (inverter) control. This design means the motor shaft is directly coupled to the screw rotor pair (no belt or gearbox transmission), and the inverter smoothly regulates rotation speed based on current air demand — reducing energy consumption during idling and frequent start/stop cycles compared to a star-delta scheme on non-regulated compressors.

The sound-absorbing enclosure isolates noise from the screw element and motor within a single housing — a design typical for compact units intended for spaces with noise restrictions (service centers, small production facilities, workshops, medical and food-industry sites).

2. Technical Specifications

⚠️ The exact meaning of “7” in the ASC7-10-200 model designation is not directly confirmed by the manufacturer (at 5.5 kW motor power, “7” likely reflects horsepower — 5.5 kW ≈ 7.5 HP, rounded); “10” corresponds to the confirmed maximum pressure of 10 bar, and “200” to the confirmed 200-liter tank volume.

3. Design Features

Designation Breakdown

Design Solutions

• Screw compressor element with direct permanent-magnet drive — eliminates energy loss from belt transmission found in simpler designs
• The frequency inverter smoothly regulates motor speed based on current air demand, reducing electricity consumption during idling and frequent start/stop cycles
• Compact layout on a 200 l tank — the compressor element and electrical equipment are mounted on a common frame with the air receiver
• The sound-absorbing enclosure reduces noise levels during indoor operation
• The outlet port has a 1/2″ female thread — a standard connection size for compressors of this output class
• Dimensions of 1200×600×1200 mm and a weight of 160 kg correspond to the compact stationary unit class

4. Installation Recommendations

• Power connection — three-phase 380 V network; select cable cross-section and circuit protection for the 5.5 kW motor power per your electrical panel’s requirements.
• Install the compressor on a flat, level surface, accounting for the 160 kg weight and 1200×600×1200 mm dimensions.
• Leave clear space around the enclosure for ventilation and maintenance (access to filters, the electrical panel with the inverter, and screw element service points).
• The outlet thread is 1/2″ female (BSP F). Select the seal type based on the thread type (see the general BSPP/BSPT sealing rules in the fitting installation section) — confirm the exact thread type (parallel G or tapered R) with the manager, as the original data only specifies “1/2 female” without a thread type.
• The direct permanent-magnet drive does not tolerate prolonged torque overloads — avoid running the compressor at consumption consistently exceeding the rated 800 l/min output.
• The 200 l tank must comply with local regulations for pressure vessels — confirm registration/inspection requirements with the manager based on the applicable rules.

5. Cross-References and Comparison

⚠️ Exact cross-reference part numbers and equivalents from other brands for the ASC7-10-200 model have not been found or verified — SIGNAIR is not among the brands widely represented in public sources. We avoid the vague claim “equivalents are available.” If you need an equivalent matched by parameters (800 l/min, 10 bar, 200 l tank), send a separate request — we’ll find a match among the brands available at Acvatron (Remeza AirCast, Comprag, etc.).

6. Common Mistakes

• Connecting to a single-phase supply — the compressor is designed for 380 V three-phase power; attempting to connect it to 220 V will result in non-operation or damage to the inverter’s electronics.
• Ignoring the maintenance schedule for the screw element — screw compressors require regular oil and oil/air filter changes based on operating hours; the schedule differs from that of piston machines.
• Insufficient space for enclosure ventilation — installing the compressor without accounting for the necessary cooling clearance can lead to overheating of the element and triggering the inverter’s protection.
• Ignoring the outlet thread type when selecting fittings — confirm with the manager whether the 1/2″ thread on a specific delivery is parallel (G) or tapered (R/NPT) before purchasing fittings.
• Skipping the check for pressure vessel regulations — the 200 l tank may fall under registration/inspection requirements depending on local legislation.

7. Application

• Small production facilities and workshops where reduced noise is important
• Service centers and businesses with noise restrictions in the work area
• Sites requiring a compact stationary unit on a 200-liter tank with an output of 800 l/min at 10 bar

8. Expert Opinion

“The combination of ‘screw element + direct permanent-magnet drive + inverter’ is today one of the most energy-efficient options on the compact compressor market: there are no belt losses, and the inverter eliminates excess energy consumption during idling and variable load. For a space with noise restrictions and an output of around 800 l/min at 10 bar, such a unit on a 200-liter tank is a sensible choice. The one thing to keep in mind is that PM motors with direct drive tolerate prolonged torque overloads less well than classic asynchronous schemes, so it’s not advisable to constantly push the compressor’s output above its rated capacity. And be sure to confirm the outlet thread type (parallel or tapered) before purchasing fittings — ‘1/2 female’ without specifying the thread type isn’t enough to select the right fitting.”

Vitali Boluchevski, Lead Engineer, Acvatron SRL, 18 years of experience

9. FAQ

❓ What type of compressor element does the ASC7-10-200 have? Screw-type, with direct permanent-magnet drive (no belt transmission) and frequency-inverter regulation.

❓ What voltage does the compressor run on? 380 V, three-phase power. The compressor is not designed to connect to a single-phase 220 V supply.

❓ What are the inverter and direct magnet drive for? The inverter smoothly regulates motor speed based on current air demand, reducing electricity consumption during idling and variable loads. The direct permanent-magnet drive eliminates energy losses from belt transmission and reduces the number of parts requiring maintenance compared to a belt-driven setup.

❓ What thread does the outlet port have? 1/2″ female thread. Confirm the exact thread type (parallel G or tapered R/NPT) with the manager before selecting fittings.

❓ At what pressure is the 800 l/min output rated? At the working pressure of 10 bar — which, for this model, also equals the compressor’s maximum pressure.