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Computerised cooling capacity test facility of RMPU of AC coaches Computerised cooling capacity test facility of RMPU of AC coaches consists of Test cubicle Computerised Test Control Panel Cold Chamber & Hot Chamber Test cubicle– provided with the Desktop system for controlling the Roof Mounted Package Unit of AC coach under test. Computerised Test Control Panel – Consists all control devices such as contactors, relays, MPCB, PLC and necessary Switchgear for controlling the RMPU under test. Cold Chamber – Provided with temperature sensors for measuring supply air and return air temperatures, hygrostat for measuring humidity and room warmers for maintaining the cold chamber temperature at 25 degrees centigrade. Hot Chamber – Consists of necessary temperature sensors, pressure gauges and condenser circulating air duct path which is used for maintaining the hot chamber at 50 degrees centigrade with the help of adjustable dampers. POHed RMP unit will be placed on test stand with help of EOT crane and test stands is further moved to hot chamber for keeping RMPU in its position. After placing RMPU in hot chamber, connect canvas duct to cold chamber and connect temperature sensors before and after condenser unit and connect control & power connections to RMPU and close the hot chamber door. Switch on the power supply to Computerised Test control panel and keep selector switch in auto mode for Switching on the unit from test run screen. Enter the all input data of blower, Condenser and Compressor details such as serial No.s, ratings, IR Values, no load currents etc.., using Test Run Screen. Then go to next and click on the auto start button. Computerised Test controller will start the switching of Blower, CD motors and Compressors as per the required time lags. all the load currents, temperatures and suction pressures are displayed on Test Screen. Measure air velocity at return air paths and read parameters using Psychometric chart Finally cooling capacity of RMPU will be calculated. It can be checked safety devices LP cut out, HP cut out, OHP functionality and save the test data. By using Test facility, Carriage workshop/ Lallaguda could conduct cooling test of POHed RMPU along with safety devices functionality on shop floor itself thereby at workshop POHed AC coaches efficacy and reliability are ascertained.