L37

Photoelectric linear encoder L37 is an incremental encoder that features reproducible thermal behavior and has a reversible reading head. It can have up to 3.240 mm measuring length and accuracy grades to any meter within the ML of up to ±3 µm.



Mechanical Data

Measuring lengths (ML), mm

140; 240; 340; 440; 540; 640; 740; 840; 940; 1.040; 1.140; 1.240; 1.340; 1.440; 1.540; 1.640; 1.740; 1.840; 2.040; 2.240; 2.440; 2.640; 2.840; 3.040; 3.240

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

- for ML 140 to 2040 mm: ± 5; ± 3 (optional)
- for ML 2040 to 3240: ± 10 μm

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

- every 50 mm.
- distance coded (see drawing)
- selectable: one RI at any location, two or more RI’s separated by distances of (n x 50 mm)
- selection by magnets: standard - one magnet (RI) in ML middle

Max. traversing speed

- when interpolation factor is 1,2,5,10: 1 m/s (shortly 2m/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 < 5 N
Protection (IEC 529) - without compressed air: IP54
- with compressed air (optional): IP64
Weight 0.4 kg + 2.8 kg/m
Operating temperature 0...+50°C
Storage temperature -20...+70°C
Permissible vibration (40 to 2000 Hz) ≤ 150 m/s²
Permissible shock (11 ms) ≤ 300 m/s²

Electrical Data

Version L37-A 11µApp L37-AV 1Vpp L37-F TTL (HTL on request)
Supply voltage + 5 V ± 5 % / < 90 mA + 5 V ± 5 % / < 120 mA + 5 V ± 5 % / < 120 mA; + 12 V ±5% / < 130 mA
Light source LED LED LED
Resolution Depends on external subdividing electronics

Depends on external subdividing electronics

5; 2.5; 1; 0.5; 0.2; 0.1 μm (after 4 - fold dividing in subsequent electronics)
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 at Up = ±5V
- high (logic "1") > 2.4 V at Up = ±5V
- low (logic "0") < 1.5 V at Up = ±12V (HTL)
- high (logic "1") > (Up - 2)V at Up = ±12V (HTL)

Reference signal

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

One quasi-triangular +R and its complementary -R per revolution. Signals magnitude at 120 Ω 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 at Up = ±5V
- high (logic "1") > 2.4 V at Up = ±5V
- low (logic "0") < 1.5 V at Up = ±12V(HTL)
- high (logic "1") > (Up - 2)V at Up = ±12V (HTL)

Maximum operating frequency

50 kHz (v=1 m/s)
100 kHz (v=2 m/s shortly)

50 kHz (v=1 m/s)
100 kHz (v=2 m/s shortly)

(50xk) kHz for k = 1, 2, 5, 10
100 kHz for k = 25, 50
Direction of signals (displacement from left to right) I2 lags I



+ B lags + A

U2 lags U1 (displacement from left to right and head position down respective glass scale)
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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