Editing Dynamic braking (section)

==Rheostatic braking==
The electrical energy produced by the motors is dissipated as heat by a bank of onboard [[resistor]]s, referred to as the ''braking grid''. Large cooling fans are necessary to protect the resistors from damage. Modern systems have thermal monitoring, so that if the temperature of the bank becomes excessive it will be switched off, and the braking will revert to being by [[Brake#Frictional|friction]] only.
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A method of electric braking in which an electric motor operates as a generator. The kinetic energy of the motor rotor and connected load is dissipated in a starting rheostat or a special braking rheostat, and a braking torque is produced on the shaft of the machine. Rheostatic braking is usually used for the light braking or complete stoppage of a transport vehicle or moving mechanical system of comparatively small mass, where the amount of energy released in the braking is comparatively small.-->