RMPU

The Microprocessor Controller for Roof Mounted AC Package Unit for LHB Coaches and Double Decker Coaches is a Microcontroller based unit to control the sub-devices of the RMPU automatically according to the Heating, Ventilation and Air-Conditioning (HVAC) algorithm, which provides comfort journey experience to the AC coach passengers of the Indian Railways.

The Microprocessor Controller consists of one Control Unit and one Display Unit. Control Unit controls the sub devices of two RMPUs and also senses the different temperatures like Return-Air temperature, Fresh-Air temperature, Supply-Air temperature and Humidity of the Return-Air etc. by means of various sensors fitted in the RMPU Units.

It also continuously monitors the status of the RMPU’s sub-units, all temperature sensors, hygrostats, safety devices, pressure sensors, power supply and stores the log of events and list of failures using “Event Recording System” and “Fault Storage System” respectively. The Events & Faults stored in the memory can be downloaded through USB port by the inserting the USB drive. The health (OK/Not OK) status of the devices additionally indicated by the glowing LEDs provided on the top of the Control Unit.

Display Unit as a part of the Microprocessor Controller consists the graphical LCD and the Keys. It is used to display Date, Time, Coach No., RMPU No. and Make, Status of the RMPU’s sub-devices, various temperature sets (pre-defined) etc., It is possible to change the defaults settings of the above mentioned parameters through the keys provided on the Display Unit. The messages displayed on the Display Unit are under the control of Control Unit.

The communication between the Control Unit and Display Unit should happen through RS-232 port. RS-485 Communication Port provided for GSM/GPRS Module connectivity, this provision felicitates to centralize the system as a future requirement.

Switch Board Cabinet Panel

The Microprocessor Controller consists of the following units.

• Control Unit
• Display Unit

Control Unit

Control Unit consists Controller Section, Digital Input Section, Digital Output Section, Communication Section, Memory Section, Real Time Clock & Watchdog Section, LED Indication Section, Power Supply Section and operates different relays associated with Blowers, condensers, compressors and heaters. It is mounted inside the switch board cabinet.

FEATURES

• Event Recording : Sampling of event recording will be done once in every 2 minutes and the past 200 hrs. of event log data will be available and it can be downloaded through USB drive via USB port.
• Fault Storage : The Control Unit stores the various tripping and faults of the RMPU and maintains past 2000 memory backup it can be downloaded through USB drive via USB port.

Display Unit

The Display Unit used to display the date, time, seven temperature settings and various parameters of the RMPUs. There is provision to set/configure the date, time, RMPU number & make and selection of seven set temperature point etc., through keypad provided on Display Unit.