Auxiliary air compressor

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The so-called auxiliary air compressor is also called auxiliary compressor (Hiko for short). It is one of the auxiliary operations of an electric locomotive . An auxiliary air compressor is operated with the vehicle battery in order to lift the pantograph and switch on the main switch. It usually generates 8 bar air pressure. The auxiliary air compressors are usually designed as piston compressors. Depending on the locomotive, the upgrade is done manually or automatically. When upgrading manually, the Hiko must be switched on separately, including the associated compressed air taps, whereas with automatic upgrading, it is sufficient to press the "Raise pantograph" button to switch on the Hiko. A check valve ensures that the auxiliary air compressor cannot direct air into the main reservoir of the locomotive.

After the successful upgrade process, the locomotive's air compressor, which is powered by traction current, is switched on.