Документация состоит из нескольких стандартов, в частности IEC 61800-5-1 (Electrical power drive systems with adjustable speed: Safety requirements), IEC 61800-5-2 (Electrical power drive systems with adjustable speed: functional safety requirements), IEC 61508-(1....7) (Functional safety of electrical/electronic/programmable electronic safety-related systems - Part 1 up to 7) и других. В интернете они есть.