{"id":977,"date":"2016-05-02T01:55:00","date_gmt":"2016-05-01T21:55:00","guid":{"rendered":"https:\/\/iesco.ge\/?post_type=project&#038;p=977"},"modified":"2026-09-06T23:50:57","modified_gmt":"2026-09-06T19:50:57","slug":"metro-tbilisi","status":"publish","type":"project","link":"https:\/\/iesco.ge\/en\/project\/metro-tbilisi\/","title":{"rendered":"Screw Compressors in Metro Tbilisi"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In 2016 IESco had another project with Tbilisi Metropolitan, creating, composing, installing special compressors for the carriage brake system, which ended with success.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Made in Georgia Screw Compressor IES-7.5 working principle:<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">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.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">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.<\/p>\n\n\n<!-- IESCO-MARKER-EXPANDED -->\n<h2>The challenge<\/h2>\n<p>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.<\/p>\n<p>The task was difficult twice over. The unit had to fit into the carriage&#8217;s existing space and run off the carriage&#8217;s DC on-board network, a supply that a standard industrial compressor cannot be connected to directly.<\/p>\n\n<h2>The solution \u2014 IES-7.5<\/h2>\n<p>IESCO designed, built and installed a dedicated screw compressor for the carriage: the <strong>IES-7.5<\/strong>. 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.<\/p>\n<p>The carriage&#8217;s on-board network is direct current, while the compressor motor needs three-phase alternating current. A <strong>Danfoss FC-302<\/strong> 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&#8217;s electrical system.<\/p>\n\n<h2>What the system includes<\/h2>\n<ul>\n<li><strong>IES-7.5 screw compressor<\/strong> \u2014 designed and assembled by IESCO<\/li>\n<li><strong>Danfoss FC-302 variable frequency drive<\/strong> \u2014 DC to 3\u00d7400 V \/ 50 Hz<\/li>\n<li>Control and protection panel<\/li>\n<\/ul>\n\n<h2>The result<\/h2>\n<p>Since 2016 these compressors have supplied compressed air to the carriages&#8217; 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.<\/p>\n\n<h2>Have a similar challenge?<\/h2>\n<p>IESCO also delivers non-standard projects, from selection and design through installation, commissioning and <a href=\"https:\/\/iesco.ge\/en\/service\/\">service<\/a>. See our <a href=\"https:\/\/iesco.ge\/en\/product-category\/compressors-and-air-systems\/\">screw compressors<\/a> and <a href=\"https:\/\/iesco.ge\/en\/product-category\/danfoss-drives\/\">variable frequency drives<\/a>.<br>\ud83d\udcde 032 206 01 00 \u00b7 Avchala 52, Tbilisi<\/p>\n\n","protected":false},"excerpt":{"rendered":"<p>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 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":978,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"off","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"project_category":[67],"project_tag":[],"class_list":["post-977","project","type-project","status-publish","has-post-thumbnail","hentry","project_category-projects"],"_links":{"self":[{"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/project\/977","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/project"}],"about":[{"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/types\/project"}],"author":[{"embeddable":true,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/comments?post=977"}],"version-history":[{"count":1,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/project\/977\/revisions"}],"predecessor-version":[{"id":11119,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/project\/977\/revisions\/11119"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/media\/978"}],"wp:attachment":[{"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/media?parent=977"}],"wp:term":[{"taxonomy":"project_category","embeddable":true,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/project_category?post=977"},{"taxonomy":"project_tag","embeddable":true,"href":"https:\/\/iesco.ge\/en\/wp-json\/wp\/v2\/project_tag?post=977"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}