Atlas Copco GA 75 VSD (FF VSD⁺) Oil-injected Air Compressor

The Atlas Copco GA 75 VSD is the variable speed oil-injected screw compressor of the GA 37-90 VSD series, rated at 75 kW (100 hp) of installed motor power. One family, two branches: the GA 75 VSD itself and the GA 75 VSD+ build, each offered as a Pack or a Full Feature unit. The integrated drive matches motor speed to air demand, so the machine draws only the power the flow actually requires. Because the drive generates its own motor frequency, the published performance holds for 50 Hz and 60 Hz plants alike.

Factory pressure variants cover 4, 7, 10, and 13 bar, and maximum working pressure for VSD machines is 13 bar(e) (188 psig). That span lets one machine serve low-pressure blowing and high-pressure tooling from the same network.

Технические характеристики

Характеристики измеряются в соответствии с ISO 1217, Приложение E, издание 4:2009, и применимы как к установкам с частотой 50 Гц, так и к установкам с частотой 60 Гц.

Installed motor power equals 100 hp on every variant. The Pack weighs 1534 kg (3382 lb) and the Full Feature build 1654 kg (3646 lb). The GA 75 VSD shares the 2248 × 1080 × 1955 mm frame of the GA 90 VSD above it in the range, so the two technologies park on identical floor marks.

Why One Table Covers 50 Hz and 60 Hz

A conventional compressor is designed around one supply frequency, and its element turns at whatever speed the grid and gearing dictate. The GA 75 VSD breaks that link: the converter synthesizes the motor frequency, so the element speed range, and with it the capacity envelope, is the same in a 50 Hz plant and a 60 Hz plant.

For buyers this removes a whole layer of engineering. One performance table, one selection procedure, and one service kit apply regardless of where the machine is installed, which simplifies quoting for groups that operate factories on different continents.

The GA 75 VSD+ Branch

The family extends into the GA 75 VSD+ branch, also rated at 75 kW (100 hp) with a maximum working pressure of 13 bar(e) (188 psig). Four pressure variants cover 4, 7, 9.5, and 12.5 bar, and the mean noise level reads 70 dB(A) measured at one meter at maximum working pressure.

Capacity follows ISO 1217, Annex E, with noise determined per ISO 2151 and ISO 9614-2. The Pack of the GA 75 VSD+ measures 1100 mm deep, 1153 mm wide, and 1968 mm high; the Full Feature build keeps depth and height and grows the width to 1656 mm, where the dryer module rides beside the compressor on the same frame. At 920 kg (1120 kg with Full Feature) this branch suits mezzanines and compressor rooms where the older generation simply does not fit.

The iPM Motor Branch

A third branch, the GA 75 VSD iPM, drives the compressor with an interior permanent magnet motor. Its technical table carries the same 50/60 Hz heading as the base machine, covers 4, 7, 9.5, and 12.5 bar variants with a maximum working pressure of 13 bar(e), and reads 73 dB(A) at one meter. The standard model weighs 865 kg on a 1610 × 990 × 1870 mm footprint.

Capacity is measured per ISO 1217, Edition 4:2009, with FAD referenced to the 4, 7, 9.5, and 12.5 bar(e) effective working pressures and noise per ISO 2151 and ISO 9614-2 at a 3 dB(A) tolerance.

Turn-Down and Pressure Stability

On the 7 bar variant the GA 75 VSD modulates from 37.4 l/s up to 250 l/s (79 to 530 cfm) as the plant breathes. That turn-down matters because a fixed speed machine below its load point must blow off the surplus, spending power on air nobody uses. The variable speed machine simply slows the element and follows the demand curve.

Net pressure stays inside a narrow band across the whole operating range, so downstream equipment sees a steady supply instead of the fluctuations that force plants to hold a wide safety margin. Fewer load and unload cycles also reduce stress on the element, the motor, and the supply network.

Integrated Drive and Elektronikon Control

The variable speed drive sits inside the canopy with its own cooling loop. It brings the motor up without current peaks, spares the electrical infrastructure, and allows a restart into a pressurized network. Every GA VSD machine is EMC tested and certified to keep electromagnetic emissions inside industrial limits.

The Elektronikon controller manages both the compressor and the converter. It holds every operating point inside safe parameters, schedules service by actual running hours, and logs alarms in plain language for the crew.

Air Path and the Full Feature Build

Air passes through a heavy duty intake filter that captures 99.9% of particles down to 3 microns before reaching the screw element. A 3-step separation process holds residual oil content below 3 ppm, and an integrated water separator with electronic drain removes the condensate from the circuit.

The Full Feature build adds an integrated refrigerant dryer with all wiring and piping assembled in the factory, tested as one unit before dispatch. Commissioning therefore needs no field plumbing between the compressor and the air treatment equipment, and the Full Feature package carries the 1654 kg total weight noted in the table above.

Where the GA 75 VSD Fits

Plants whose demand swings between shifts, batches, or seasons gain the most, because every minute of avoided unloaded running lowers the power bill. Mixed-pressure sites also consolidate: one machine covers low-pressure blowing in the morning and high-pressure tooling after lunch instead of two fixed speed units. For level, full-load duties the fixed speed Воздушный компрессор Atlas Copco GA 250 с масляным смазыванием range and the GA 75 complete the picture.

GA 75 VSD FAQ

Why does this machine have a single table for 50 Hz and 60 Hz?

The integrated drive generates its own motor frequency, so element speed does not follow the grid. The same capacity envelope therefore applies to both supplies, measured per ISO 1217, Annex E.

How far can flow turn down?

On the 7 bar build output modulates from 37.4 to 250 l/s (79 to 530 cfm); the 4 bar build spans 37.8 to 250 l/s (80 to 529 cfm).

What separates the base branch from the GA 75 VSD+?

Both run the same 75 kW (100 hp) motor and 13 bar(e) maximum. The base machine covers 4 to 13 bar at 69/70 dB(A) on the 2248 × 1080 × 1955 mm frame, while the GA 75 VSD+ covers 4 to 12.5 bar at 70 dB(A) in a package that starts at 1100 mm deep and weighs 920 kg as a Pack.

What is the iPM branch?

The iPM build drives the same screw element with an interior permanent magnet motor. It covers 4 to 12.5 bar at 73 dB(A), weighs 865 kg as a standard model, and shares the 13 bar(e) maximum of the family.

How heavy is the GA 75 VSD?

The Pack weighs 1534 kg and the Full Feature build 1654 kg; the GA 75 VSD+ branch weighs 920 kg as a Pack and 1120 kg with Full Feature.

What does the Full Feature build include?

An integrated refrigerant dryer with factory wiring and piping, filters, and electronic condensate drains, delivered tested as one unit. On the GA 75 VSD+ the dryer widens the package from 1153 to 1656 mm instead of lengthening it.

Which plants benefit most from the GA 75 VSD?

Sites with swinging demand, two-shift patterns, or mixed pressure levels gain the most, since the drive removes unloaded running and one machine can cover duties that would otherwise need separate compressors.