Altivar 61 And Altivar 61 Plus Variable Speed Drives Page 87 Altivar Plus 900-2500 HP

87 Altivar 61 variable speed drives To protect the power semiconductors (IGBTs) against thermal overloads, the carrier frequency is automatically reduced at operation below 3 Hz. If the overload time exceeds 60 seconds, the drive will trip. During operation at output frequencies < 1 Hz, the overload capability is restricted and the overload time is lower than 60 s. at 0.0 Hz, the overload time is only 5 s at 0.5 Hz, overload time is approximately 32 s from 1.0 Hz, overload time is 60 s 900-2500 hp Specifications Altivar Plus

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