Recommended Practice

Propulsion Controls Periodic Inspection and Maintenance


This Recommended Practice gives the minimum requirements for the periodic inspection and maintenance of propulsion controls used on rail transit vehicles.

Document History
Document Number Version Publication Date Publication Related Information
APTA RT-VIM-RP-018-03 Rev. 1 01/06/2017 Published Current


propulsion controls, inverter, chopper, switch resistance,


Rail transit vehicle propulsion controls in use today vary considerably in design. The components used, however, can be maintained using similar techniques, irrespective of the design variations. Propulsion controls fall into three general groups: switched resistance (e.g., DC cam), DC-DC chopper and DC-AC inverter.

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