L18

Photoelectric linear encoder L18 is an incremental linear displacement measuring device that can have up to 2.040 measuring length, grating period of ±20 µm or ±40 µm  and accuracy that can reach up to 3 µm.



Mechanical Data

Measuring lengths (ML), mm


70; 120; 170; 220; 270; 320; 370; 420; 520; 620; 720; 820; 920; 1020; 1140; 1240; 1340; 1440; 1540; 1640; 1740; 1840; 1940; 2040

(mounting spar optional up to ML 1240, mandatory from ML 1340 to 2040)

Accuracy grades to any meter within the ML (at 20°C)

± 10; ±5; ±3 μm (optional)

Grating period 20 μm; 40 μm (optional)
Reference marks (RI)



- standard for ML ≤ 1020 mm: 35 mm from both ends of ML
- standard for ML ≥ 1140 mm: 45 mm from both ends of ML
- optional: one RI at any location, or two or more RI's separated by distances of n x 50 mm or distance-coded
Max. traversing speed


- when interpolation factor is 1,2,5,10: 1 m/s
- when interpolation factor is 25: 0.5 m/s
- when interpolation factor is 50: 0.4 m/s
Required moving force with sealing lips < 3 N
Protection (IEC 529) - without compressed air: IP53
- with compressed air (optional): IP64
Weight 0.4 kg + 0.8 kg/m
Operating temperature 0...+50°C
Storage temperature -20...+70°C
Permissible vibration (40 to 2000 Hz) ≤ 30 m/s²
   

Electrical Data

Version L18-A ∫ 11 µApp L18-AV ∫ 1 Vpp L18-F Π TTL
Supply voltage + 5 V ± 5 % / <90 mA + 5 V ± 5 % / < 120 mA + 5 V ± 5 % / < 120 mA
Light source LED LED LED
Incremental signals

Two sinusoidal I1 and I2
Amplitude at 1 kΩ load:
- I1 = 7 - 16 µA
- I2 = 7 - 16 µA

Differential sine +A / -A and +B / -B
Amplitude at 120 kΩ load:
- A = 0.6 - 1.2 V
- B = 0.6 - 1.2 V

Differential square-wave U1 / U1 and U2 / U2. Signal levels at 20 mA load current:
- low (logic "0") ≤ 0.5 V
- high (logic "1") ≥ 2.4 V

Reference signal

One quasi-triangular I0 peek per revolution. Signal magnitude at 1 kW load:
- I0 = 2 - 8 µA (usable component)

One quasi-triangular +R and its complementary -R per revolution. Signals magnitude at 120 W load:
- R = 0.2 - 0.8 V (usable component)

One differential square-wave U0 / U0 per revolution. Signal levels at 20 mA load current:
- low (logic "0") < 0.5 V
- high (logic "1") > 2.4 V


Maximum operating frequency


50 kHz



50 kHz



50xk kHz, when interpolation factor is 1,2,5,10
1000 kHz, when interpolation factor is 25. 50


Direction of signals
I2 lags I1 for clockwise rotation (viewed from shaft side)


+ B lags + A in clockwise rotation
(viewed from shaft side)

U2 lags with U1 in clockwise rotation (viewed from shaft side)
Standard cable length 3 m; without connector 3 m; without connector 3 m; without connector
Maximum cable length 5 m 25 m 25 m

Accessories

Drawings

Typical Applications

           
   
           
           

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