In 2016 IESco had another project with Tbilisi Metropolitan, creating, composing, installing special compressors for the carriage brake system, which ended with success.
Made in Georgia Screw Compressor IES-7.5 working principle:
Screw compressor air End NK31 (German Rotorcomp) is directly driven by a 7.5kw Electric motor. Produced air is supplying metropolitan carriage brake systems, Pneumatic and electrified devices with compressed air.
As the metropolitan electric grid does not equip with 400 volt 50hz system, the IES-7.5 Compressor is implemented with Danfoss FC-302 inverter which converts DC power to AC power, which then feeds compressor with threefold 400 AC 50hz.
The challenge
A metro carriage braking system is pneumatic: the brakes and auxiliary mechanisms run on compressed air. Losing the air supply means pulling the train out of service, so the compressor here is not an auxiliary unit but a safety component.
The task was difficult twice over. The unit had to fit into the carriage’s existing space and run off the carriage’s DC on-board network, a supply that a standard industrial compressor cannot be connected to directly.
The solution — IES-7.5
IESCO designed, built and installed a dedicated screw compressor for the carriage: the IES-7.5. A screw block was chosen over a piston design because it is built for continuous duty, produces less vibration and lasts considerably longer on rolling stock.
The carriage’s on-board network is direct current, while the compressor motor needs three-phase alternating current. A Danfoss FC-302 variable frequency drive was therefore built into the system. It converts DC into 400 V / 50 Hz three-phase power and, at the same time, softens the starting current, which is critical for the carriage’s electrical system.
What the system includes
- IES-7.5 screw compressor — designed and assembled by IESCO
- Danfoss FC-302 variable frequency drive — DC to 3×400 V / 50 Hz
- Control and protection panel
The result
Since 2016 these compressors have supplied compressed air to the carriages’ braking systems and to pneumatic and electro-pneumatic equipment. The project showed that a special-purpose industrial compressor can be designed and built in Georgia, without depending on a ready-made imported solution.
Have a similar challenge?
IESCO also delivers non-standard projects, from selection and design through installation, commissioning and service. See our screw compressors and variable frequency drives.
📞 032 206 01 00 · Avchala 52, Tbilisi
