Auto-Transformer Phase Converters (Type ASC-**-24)
Auto-Transformer phase converters deliver full rated HP, and can be adjusted to provide current balance at a fixed load. These high efficiency Phase Converters automatically limit inrush currents to three times the normal single phase amperage. They are ideally suited for 460v three phase applications, and are supplied standard as 240v or 480v 1 phase input / 480v 3 phase output. - External step up transformers are not required. Auto-Transformer Phase Converters - models suffix "24" are supplied as 240v 1 phase input / 480v 3 phase output. Models suffix "24" are supplied in NEMA 3 enclosures and are primarily intended for oil well pumping motors. These converters are a complete power system which includes main breaker, auto-transformer, load magnetic starter and overload protection, H/O/A selector, provision for pressure switch, and surge suppresser. The ASC converters have one additional feature for use with pumps. Most larger submersible or centrifugal pumps are operated from "soft-start" magnetic starters, used in part to reduce stress on mechanical components during the motor's start cycle. Motors connected to an ASC converter require "full-voltage" magnetic starters (not expensive soft-start devices), because the ASC has adjustment for lowering the starting torque developed by the motor. This same feature applies to any motor connected to the ASC (not just pump motors). Reduction of shock loading is an important feature for larger electric motors and should not be overlooked. Purchase an ASC - and save the price difference between the soft-start starter you might normally buy and that of an across-the-line starter. The above table is presented as a "Class 1" general
guide only. "Converter "Class" refers to the size of converter versus load.
For additional information on converter Class, preview "General Information".
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