Linear magnetic encoders for harsh environments

Description

New LM13 linear magnetic encoders bring big performance to small spaces and tough applications. Consisting of only a readhead and separate self-adhesive scale, the LM13 gives OEM designers an ultra-compact package that's ideal for industry's toughest applications in woodworking, metalworking, stone cutting, paper converting, packaging, plastics processing, laser/flame/water-jet cutting, chip/board production or assembly and packaging machinery. Magnetic sensing delivers dependability in applications too dusty, dirty, greasy or destructive for optical encoders. Engineered for extreme service, LM13 encoders handle operating temperatures from -10°C to 85°C, providing waterproof sealing to IP68 and high resistance to shock, vibration and pressure. Frictionless operation eliminates wear, while reducing system inertia and hysteresis for high precision at high speeds and acceleration loads. LM13 encoders produce a digital, square-wave signal output to RS422, with customer-selectable resolution of 1, 2, 5, 10, 20, 25, 50, 125 and 250 µm. The encoder comes with bidirectional reference that can be actuated by a preset mark integrated into the scale, or by adding a reference sticker on top of the scale using the self-aligning installation tool. Simple to install, the LM13 features integral go/no-go LEDs on the readhead, wide installation tolerances, and an applicator tool for the adhesive-backed scale. The scale is available either “cut to length” or in lengths up to 100 m in easy-to-handle coils. The new Renishaw linear encoders join the proven family of RLS magnetic rotary/angle encoders designed and manufactured by Renishaw’s associate company RLS d.o.o. As with all Renishaw products, a worldwide application support network and local inventory give confidence to system developers and OEM volume producers.

Specs

• Sensor/magnetic scale gap With periodic or machined reference: 0.1 to 1.5 mm • With stick-on reference: 0.5 to 1.5 mm • Error band ±40 µm at 20 °C • Linear expansion coeffcient ~ 17 × 10-6/K • Repeatability Better than unit of resolution • Hysteresis * < 3 µm up to 0.2 mm ride height • Sub divisional error ±3.5 µm for < 0.7 mm ride height • ±7.5 µm for 1 mm ride height • ±15 µm for 1.5 mm ride height • Cable PUR high fexible cable, drag-chain compatible, double-shielded • 8 × 0.05 mm2 • ; durability: 20 million cycles at 20 mm bend radius • Power supply 4.6 V to 7 V – reverse polarity protected ** • Power consumption (without any load) < 30 mA • Voltage drop over cable 13 mV/m – without load • 54 mV/m – with 120 Ω load • Output signals Digital – Differential RS422, short circuit protected • Temperature Operating -10 °C to +80 °C (cable under non-dynamic conditions: -20 °C to +85 °C) • Storage -40 °C to +85 °C • Environmental sealing IP68 (according to IEC 60529) • EMC Immunity IEC 61000-6-2 (particularly: ESD: IEC 61000-4-2; EM felds: IEC 61000-4-3; Burst: IEC 61000-4-4; Surge: • IEC 61000-4-5; Conducted disturbances: IEC 61000-4-6; Power frequency magnet felds: IEC 61000-4-8; • Pulse magnetic felds: IEC 61000-4-9) • EMC Interference IEC 61000-6-4 (for industrial, scientifc and medical equipment: IEC 55011) • Vibrations (55 Hz to 2000 Hz) 300 m/s2 (IEC 60068-2-6) • Shocks (11 ms) 300 m/s2 (IEC 60068-2-27)
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