RMPU Filters

Shown here are Fresh and Return Air Filters of non-LHB RMPUs.

Some questions are:

What is frequency of change?

How best to clean these Filters?

Load Chart of Coaches

In GS Coaches:

• Fluorescent Light 18 Watt 18 nos = 324 W = 2.94 Amps
• Doorway Light 18 W 6 nos = 108 W = 0.98 Amps
• Lavatory Light CFL  2 x 11 W   4 nos = 88W  = 0.8 Amps
• Gangway Light CFL 11 W 2 nos = 22 W = 0.2 Amps
• Wash Light 14 W 2 nos = 28 W = 0.24 Amps
• Pass Alarm Indication Lamp LED 8 W 2 nos
• BLDC Fan 400 mm sweep 32 W 27 nos = 864 W = 7.86 Amps
• Mobile Charger Socket 3 pin 2 W  4 nos = 8 W = 0.07 Amps
• Total = 1440 W = 13.09 Amps  

In CN Coaches:

• Fluorescent Light 18 Watt 18 nos = 324 W = 2.94 Amps
• Doorway Light 18 W 4 nos = 72 W = 0.98 Amps
• Lavatory Light CFL  11 W  4 nos = 88W  = 0.8 Amps
• Gangway Light CFL 11 W 2 nos = 22 W = 0.2 Amps
• Wash Light 14 W 2 nos = 28 W = 0.24 Amps
• Night Light LED 1 W 8 nos = 8 W = 0.07 Amps 
• Pass Alarm Indication Lamp LED 8 W 2 nos
• Mobile charging socket 3 pin 2W 18 nos = 36 W = 0.33 Amps
• Fan 400 mm sweep 38 W 27 nos = 864 W = 7.86 Amps
• Laptop cum Mobile Charger Socket 5 pin with 100 VA inv  65W  4 nos =260 W = 2.36 Amps
• Total = 1818 W = 16.53 Amps  

How to replace compressor?

How Air conditioning works

Some Improvements-2

Some Improvemnts-1

Some Imrovements

Axle Pully Pad

On the left we can see cleft in the pad which was just few weeks old. Quality of Axle pully rubber pads should be such that it should last 9 months (IOH) or even more.(POH).
Can you guess the purpose of rubber pad?

Important Equipments in Electrical Coaching

Battery box packing ( wooden ) is not very reliable, nowadays FRP/Acid proof sheets and trays are coming.

Sensors in the RMPUs are vital. They should be regularly cleaned and calibrated.

The Vane Relay Mechanism

Above we see the vane relay of RMPU

EXPENSION VALVE WITH ACTUATOR OPEN

MCB Panel of the non-AC pantry can be seen above

Safety Items in Coaches

Fuses in Pantry Cars

ERRU/RRU

Above is the latest version of 4.5 KW ERRU in which some important interfaces like rest switch and fuses have been given oustde the box for easy accessibilty.

How to identify make in emergency lights?

This is the riddle
 maintenance staff has to solve.

Solenoid valves in LHB RMPU; Are they redundant?

 Actuator removed, circuit removed

Fuses in Coaches

I have put up stock position link on the right side of the blog.