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Description
Application Scenarios:
In a precision rolling mill for thin-gauge steel, maintaining exact and synchronized speed between multiple drive sections is critical to prevent tension fluctuations that cause tearing or rippling in the metal strip. The main drive motors are controlled by ABB ACS880 drives, each requiring ultra-precise feedback. A high-resolution, 1440-pulse-per-revolution (PPR) sin/cos encoder is mounted on each motor shaft. The raw analog sine wave signals from this encoder are susceptible to electrical noise over the long cable runs in the mill. The ABB YXU144 pulse transformer unit is installed in the drive cabinet. It receives these delicate sin/cos signals, performs conditioning and noise rejection, and multiplies/interpolates them internally. It outputs a robust, digital 1440 PPR square wave signal (channels A, B, and Z) that the drive’s control board can process with high immunity to interference. This ensures the drive receives a flawless representation of the motor’s exact position, enabling the sophisticated torque control algorithms to keep each stand in perfect sync, resulting in consistent, high-quality steel production with near-zero defects.
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Main Parameters
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Value/Description
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Product Model
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ABB YXU144 (also ABB YT296000-MC)
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Manufacturer
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ABB
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Product Category
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Drive System Accessory / Encoder Interface / Pulse Transformer Unit
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Compatible Drive Series
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Designed for ABB ACS800, ACS880, and similar drive platforms
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Input Signal Type
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Typically accepts 1 Vpp sine wave signals (Sin, Cos, and reference) from a resolver or sin/cos encoder
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Output Signal Type
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Digital square wave pulses (A, B channels with 90° phase shift, and a zero pulse Z channel)
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Output Pulse Count
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1440 pulses per revolution (PPR)
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Supply Voltage
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Typically +24 VDC (sourced from the drive or external supply)
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Interpolation Factor
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Internal signal multiplication to achieve the stated 1440 PPR output from a lower base encoder frequency
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Communication Interface
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Hardwired terminal connection for power and signals
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Primary Function
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Signal conditioning, noise isolation, and pulse multiplication for high-resolution position/speed feedback
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Mounting
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Typically DIN-rail mounted inside the drive or control cabinet
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Note on Output Pulse Count: The 1440 PPR output is a high-resolution standard. This provides 0.25 degrees of mechanical resolution per pulse (360°/1440), which is essential for precise speed control and low-speed operation.
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Note on Signal Conditioning: A key function is electrical isolation and amplification, converting weak analog encoder signals into robust digital levels immune to the harsh electrical environment of a drive cabinet.
