L35 Photoelectric Linear Encoder

by Precizika Metrology

The precision sealed linear encoder L35 is used to convert linear displacements of key machine components into electrical signals containing information about the value and direction of the displacements. 

The encoder consists of a glass scale installed into a rigid hollow housing and a ball-bearing-guided reading head.  To be able to work in harsh environments (cooling liquid, lubricants and chips), the encoder has two rows of sealing lips.  Filtered air can be supplied into the housing of the encoder for extra protection from dust. 

Characteristic feature of encoder is a rigid housing that provides better resistance to vibration and higher protection grade due to two pairs of sealing lips.

Reference mark can be selected by magnet, which moves in horizontal groove on the front side of encoder (optional).

Three versions of output signal are available:

  • L35-A - sinusoidal signals, with amplitude approx. 11 µApp.
  • L35-AV - sinusoidal signals, with amplitude approx. 1 Vpp.
  • L35-F - square wave signals, type TTL or HTL (standard RS422) with integrated subdividing electronics for interpolation x1, x2, x5, x10, x25, x50.

MECHANICAL DATA

Measuring lengths (ML), mm 170; 220; 270; 320; 370; 420; 470; 520; 620; 720; 820, 920, 1020, 1140, 1240, 1340, 1440, 1540, 1640, 1740, 1840, 1940, 2040, 2140, 2240, 2340, 2440, 2540, 2640, 2740, 2840, 2940, 3040, 3140, 3240 (other intermediate lengths on request)

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

- for ML from 170 up to 2040 mm

- for ML from 2040 up to 3240 mm

 

 

±5; ±3; ±2 µm (optional) 

 

±10 µm

Grating period 20 µm; 40 µm

Reference marks (Rl):

-standard for ML ≤1020 mm

-standard for ML >1140 mm

-optional

-selection by magnets

35mm from both endso fo ML

45mm from both endso fo ML

one RI at any location, two or more Rl's separated by distances of (n x 50 mm)

standard - one magnet (Rl) in ML middle

Max. traversing speed:

-when interpolation factor is 1, 2, 5, 10

-when interpolation factor is 25

-when interpolation factor is 50

 

1 m/s (shortly 2 m/s)

 

0.5 m/s

 

0.4 m/s

Required moving force with sealing lips < 5 N

Protection (IEC 529):

-without compressed air

-with compressed air (optional)

 

IP54

 

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 L35-A ∼ 11 µApp L35-AV ∼ 1 Vpp L35-F TTL; HTL
Power Supply +5 V ± 5% / <
Light source LED LED LED
Resolution Depends on external subdviding electronics Depends on external subdividing electronics 5; 2.5; 1p 0.5; 0.2; 0.1 µm (after 4-fold dividing in subsequent electronics)
Incremental signals

Two sinusoidal l1 and l2

Amplitutde at 1 k Ohm load

- l1=7-16 µA

-l2=7-16 µA 

Differential sine +AV-A and +B/-B Amplitude at 120 Ohms load

-R = 0.2-0.8 V (usable component)

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-trianguler lo peak per revoloution. Signal magnitude at 1 k Ohm load:

- lo = 2-8 µA (usable component)

 

One quasi-triangular +R and its complementary -R per revolution. Signals magnitude at 120 Ohm load

- R = 0.8-0.8 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 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)

where k-interpolation factor

50 kHz (v=1 m/s)

100 kHz (v=2 m/s shortly)

(50 x k) kHx for k = 1, 2, 5, 10

1000 kHz for k = 25, 50.

Direction of signals l2 lags l1 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

Note:  If cable extension is used the power supply conductor section should not be smaller than 0.5 mm².