Diesel Locomotives of Sri Lanka

Construction of Class M7

1981 “BRUSH” diesel engine of Sri Lanka.

ELECTRICAL POWER SYSTEM

This page shows the proposed electrical / electronic power and traction system for the M7 project.

What am I looking for?

2 – 12 volt semi-traction (minimum) 85Ahr batteries, 110 Amp would be the better option. (connected in series to provide 24 volts). There is a wide choice of types available that will provide the current to operate the motors, however factors such as cost, type, size, output and voltage are variables which need to be considered. A deep cycle type battery will give the best performance to ensure that the life and capacity duration is able to meet the demands placed upon the engine when operating. There are high tech. batteries available but these are at a premium price.

2 – 24 volt “Bosch GPA 750 watt bi-directional motors part no. 0 130 302 014. (provides a total of 2 hp of direct traction) Proven means of B.E. traction on past engines.

A 4QD Pro 120 Controller unit has been installed and is eminently suitable for this kind of operation.

Plug in connections on both buffer beams for a hand controller to plug into. This will allow the engine to be operated from either end without having to turn the engine on a turntable when in service.

A audible sound system of horns (air operated) is expected to be installed shortly

A working compressed air system for operating the engine brakes and the driving trolley is to be installed shortly.

A (possible) electronic engine sound system that emulates the engine noise and sounds under operational use.

Suitable batteries to provide the power to operate the auxiliary electrical / electronic services have also been purchsed.

Power braking control: Miniature air compressors have been purchased, duplex servo-brake low pressure cylinders are being designed and made. A manual operated brake is also needed to back up in case of air failure. Both the engine and the driving truck will have air braking systems fitted. Carriages can differ at various railways with type of braking systems in use. Vacuum and or air are in use but may also differ in design, so advance information is required before visiting a different railway to ensure compatibility.

Bogies- initial electric motor test

Battery space / location data

4QD Pro 120 Controller unit

Miniature air compressors for

the proposed air brakes system.

SLM7 – Elect. system – stage. i

HOME PAGE MAIN IMAGE MENU M7 INTRO PAGE

Chassis Body Cab Bogie Power(Mech) Power(Elec) Finish Testing

This page shows the proposed electrical / electronic power and traction system for the M7 project. What am I looking for? 2 – 12 volt semi-traction (minimum) 85Ahr batteries, 110 Amp would be the better option. (connected in series to provide 24 volts). There is a wide choice of types available that will provide the current to operate the motors, however factors such as cost, type, size, output and voltage are variables which need to be considered. A deep cycle type battery will give the best performance to ensure that the life and capacity duration is able to meet the demands placed upon the engine when operating. There are high tech. batteries available but these are at a premium price. 2 – 24 volt “Bosch GPA 750 watt bi-directional motors part no. 0 130 302 014. (provides a total of 2 hp of direct traction) Proven means of B.E. traction on past engines. A 4QD Pro 120 Controller unit has been installed and is eminently suitable for this kind of operation. Plug in connections on both buffer beams for a hand controller to plug into. This will allow the engine to be operated from either end without having to turn the engine on a turntable when in service. A audible sound system of horns (air operated) is expected to be installed shortly A working compressed air system for operating the engine brakes and the driving trolley is to be installed shortly. A (possible) electronic engine sound system that emulates the engine noise and sounds under operational use. Suitable batteries to provide the power to operate the auxiliary electrical / electronic services have also been purchsed. Power braking control: Miniature air compressors have been purchased, duplex servo-brake low pressure cylinders are being designed and made. A manual operated brake is also needed to back up in case of air failure. Both the engine and the driving truck will have air braking systems fitted. Carriages can differ at various railways with type of braking systems in use. Vacuum and or air are in use but may also differ in design, so advance information is required before visiting a different railway to ensure compatibility.	Bogies- initial electric motor test
	Battery space / location data
	4QD Pro 120 Controller unit
	Miniature air compressors for the proposed air brakes system.