GEL 235
GEL 2351
GEL 2352
GEL 235 Accessories

GEL 207
GEL 208
GEL 209
GEL 219
GEL 260
GEL 293
GEL 2010
GEL 27xx
GEL 2952

GEL 211
GEL 212
GEL 213

GEL 2432
GEL 2440
GEL 2444 K
GEL 2444 T
GEL 2448
GEL 2800
Precision target wheel ZAx/ZFx

GEL 290
GEL 2035
GEL 2037

GEL 247
GEL 2477
GEL 2478

GEL 8230
GEL 8231
GEL 8232
GEL 8240
GEL 8241
GEL 8251
GEL 8500
GEL 855xx
GEL 890460

GEL 3010
GEL 3011

GEL 2161

General Information

Incremental encoders convert rotations into electric signals. Lenord + Bauer incremental rotary pulse encoders combine the advantages of a magnetic measuring system and a robust mechanical design. They have proven successful all over the world in many different applications and even under roughest industrial conditions. Their high reliability and a long service life go without saying.

Fields of Application

• Heavy industry
• Paper-making and packaging machines
• Filling machines
• Transporting and storing systems
• Machines for processing steel, wood, stone, textiles and plastic, etc.

Main Characteristics

• High resolution up to 273.408 pulses per revolution
• Interpolation up to 1024
• Additionally current output 0 ... 20 mA, 4 ... 20 mA, -20 ... +20 mA (option)
• Reference signal
• Cable or plug outlet, axial or radial
• High electromagnetic compatibility (EMC)
• For use in explosion hazardous areas (option)

Measuring Principle

Measuring principle The encoders work with differential sensors depending on magnetic fields and a precision toothed wheel as measure. The sensors scan the tooth structure of the toothed wheel and emit a sine or cosine voltage. The integrated evaluation electronics in ASIC and SMD technology converts the analogue sensor signals into incremental output signals.

Advantages of the magnetic system

• No adverse effect due to condensed water
• Absolute operational reliability even in case of high humidity (dewing) and frequent change of ambient temperature
• Extremely insensitive to dirt, oil and water
• Extremely shock- and vibration-resistant because the measure is not made of glass nor plastic
• Outstanding operational safety over a very long period of time as it does not suffer from ageing effects as optical systems do

Output Signals

Signal pattern V, VN

Signal pattern "V" stands for two tracks with square-wave signals, offset by 90° (push-pull output). With each revolution, a reference signal with defined length is put out on the third track N (optionally). At an output frequency of 200 kHz the edge distance (F) is ≥ 0.6 µs.

Signal pattern T, TN, U, UN, X, XN

Both tracks and the reference signal (option) are additionally output as inverse signals.

Signal pattern S, SN

Pulses which are independent of the rotational direction and the duration of which is constant are derived from the square-wave signals as per signal pattern V and put out on track 2. Furthermore, a signal depending on the rotational direction is obtained from the signal pattern which is put on track 1. Once per each revolution a reference signal is output on the third track N (optional). The outputs have a final push-pull power stage. All outputs are sustained short-circuit-proof. The pulses follow a possible change of rotation with a slight delay, in order that a subsequent counter setting can be adjusted to the counting direction prior to the pulse. The sense-dependent signal may be reversed via a which is accessible from outside (switch 1).

Key

V_S = operating voltage
V_Sig = signal voltage
a = 360° electrical
b = 90° phase shift
F = edge distance (for an output frequency of 200 kHz the edge distance is F > 0.6 µs)
Signal pattern = shown for clockwise rotation (view on top of the encoder shaft) Reference signals with other lengths upon request.

Output level

The signal patterns S, SN, V, VN, X and XN have HTL level, the signal patterns T, TN, U and UN have TTL level (for the output voltage see electrical data). All outputs have a push-pull power amplifier and are short-circuit-proof. The peak output current for recharging the cable capacity is 100 mA.

Current Outputs

Measuring current which is independent on the sense of rotation and which has a nominal range of -20 ... +20 mA. The polarity of the current can be reversed by switch 1 which is accessible from outside.

Measuring current which is independent of the sense of rotation and which has a nominal range of 0 ... +20 mA.

Measuring current which is independent of the sense of rotation and which has a nominal range of +4 ... +20 mA.

Current output

For the means of displaying and controlling, a measuring current of 0 to 20 mA, 4 to 20 mA or -20 to +20 mA can be obtained from the pulse frequency which depends on the speed and – if ordered – the sense of rotation. For this purpose the measuring pulses are integrated and converted into a rotation speed dependent output current. There is a strictly linear interrelation between the measuring current and the pulse frequency. Because of the high resolution (up to 273,408 pulses per revolution) a DC output current is obtained which shows a low harmonic content even at a very low speed range (e.g. 0 to 0.5 min-1). The harmonic content depends on the pulse frequency and the determined attenuation d, latter influencing the rising and trailing edge times as well as the delay time in case of erratic changes of the speed. The preferred attenuation had been specified when ordering the encoder corresponding to the following diagram; d₃ is the default setting.

Data of the current outputs

max. apparent ohmic resistance	Ra	550	Ω
measuring device class	K	1
rated current tolerance		< 1	%
linearity error		< 1	%
repeatability	r	100	%
temperature drift	ΔIaT	< ± 3	µA/1 °K
min. RPM	nmin electrical (attenuation d5)	1.5 x 103/i	RPM
max. RPM	nmax electrical	6 x 106/i	RPM

i = rated pulse number

Technical data tables according to DIN 32878

General
Description	Gel 207/208/209/219	GEL 260 EEx
measuring step from ... to 1)	36 ... 0.013°
pulse number per revolution 1)	10 ... 273.408
Accuracy
error limit 2)	0.07°
incremental deviation 2)	0.01°
repeatability 2)	0.005°
Electrical Data
power consumption RL = ∞, VS = 10…30 V DC RL = ∞, VS = 5 V DC	≤ 1.3 W (with current output: ≤ 1.65) ≤ 1.0 W ≤ 1.0 W(with current output: ≤ 1.40)
max. output frequency
output level for signal pattern T/TN (logic level TTL)	high signal: ≥ VS - 1.00 V at I = 10 mA;     ≥ VS - 1.20 V at I = 30 mA low signal: ≤ 0.75 V at I = 10 mA;     ≤ 1.00 V at I = 30 mA
output level for signal pattern U/UN (logic level TTL)	high signal: ≥ 4.00 V at I = 10 mA;     ≥ 3.85 V at I = 30 mA low signal: ≤ 0.75 V at I = 10 mA;     ≤ 1.00 V at I = 30 mA
output level for signal pattern S/SN, V/VN and X/XN (logic level HTL)	high signal: ≥ VS - 1.80 V at I = 10 mA;     ≥ VS - 2.20 V at I = 30 mA low signal: ≤ 1.15 V at I = 10 mA;     ≤ 1.55 V at I = 30 mA
Mechanical Data
shaft diameter	6 mm, 8 mm, 10 mm, 12 mm
housing diameter	90 mm	115 mm
weight	approx. 0.7 kg	approx. 5.1 kg
max. operating	10,000 min-1	3,000 min-1
moment of inertia of rotor	7 x 10-5 kgm2
max. angular acceleration	extremely high, as shaft and measuring wheel (steel) are pressed
operating torque	0.03 Nm (< 0.01 Nm with ball bearing cover (IP 50) Option)
starting torque	0.05 Nm (0.01 Nm with ball bearing cover (IP 50) Option)
max. shaft load (point of application 15 mm before the contact surface of the flange)	200 N axial 200 N radial
permissible shaft load	We recommend connection by a radial flexible coupling.
bearing life (at half shaft load)	12.600 x 106 revolutions
bearing life (at max. shaft load)	2.000 x 106 revolutions
Environmental conditions
operating temperature	0 ... + 70 °C (standard); - 20 ... +85 °C (option)
ambient temperature	- 20 ... + 85 °C
storage temperature	-40 ... +105 °C
protection class according to DIN EN 60529	IP 65	pressure-resistant IP 54
vibration protection (option) according to DIN EN 60068-2-6	frequency 10 ... 2000 Hz; peak acceleration 100 m/s2; frequency cycles 10
shock protection (option) according to DIN EN 60068-2-27	peak acceleration 1000 m/s2; duration 11 ms
insulation strength according to VDE 0660 part 500 version 08/00 or DIN EN 60439-1	Ri > 1M Ω, at a testing voltage of 500 V AC
electromagnetic compatibility	EN 61000-6-1 to 4

¹⁾ max. value with external evaluation of the signal pattern. See further down the page for possible pulse numbers (resolutions).
²⁾ value fo highest resolutions. Values for low resolutions on request.

Pin layouts: plug, Cable assignment

Pin layout: plug (The counter plug is included in the scope of supply.)



Cable assignment



Cable assignment



Key V_S = operating voltage
V_Sig= signal voltage
current output A = -20 mA ... +20 mA
current output B = 0 mA ... +20 mA
current output C = +4 mA ... +20 mA
Signal pattern shown for clockwise rotation (view on top of the encoder shaft). Reference signal with other length upon the request.

Maximum Cable Lengths between encoder and secondary electronics. The cable screening is to be earthed one-sided at the receiver. The stated data are standard values referring to cable type LiYCY 6 (10) x 0,25 mm2 .

VS = 5 V (TN, UN), sense connected
f [kHz] Lmax [m]	5 10 20 50 100 200 200 200 200 200 145 72

VS = 20 S, V (SN, VN)
f [kHz] Lmax [m]	5 10 20 50 100 200 200 200 200 80 40 20

VS = 20 V (XN)
f [kHz] Lmax [m]	5 10 20 50 100 200 200 200 100 40 20 10

Dimensioned drawings, version EEx Protection of the electronic (optional)

Protection of the electronics (optional)

Protection against humidity

The encoders’ electronic unit is coated with a highly effective protection against humidity, salt-water atmosphere and corrosive vapours to ensure their proper functioning during years even under roughest conditions.

Condensed-water outlet

Water may accumulate in the encoder if it is exposed to multiple dewing. The water can drain off through the condensed-water outlet. When mounting the encoder the outlet must show downward. The protection class drops to IP 64.

Protection against vibration

The additional fixing of mechanical parts with special plastic prevents the electronics and the connections inside the encoder from vibrating. Thus the proper and continuous operation of the encoder - even if exposed to extreme vibration and shock – is guaranteed.

Version GEL 260 EEx Through mounting of the GEL 260 in a flameproof housing Ex-protection to VDE 0171. protection
class:    II 2G EEx de [ia/ib] IIC T5-T6
certificate:  PTB03ATEX1051 - (formerly PTB-Nr. Ex-87/1095)

ordering details:   in the type code
protection of the electronics
-protection class EEx select -
shaft diameter, length
- ø = 12 mm L = 27 mm select -

Cable outlet
- 7-core cable select - or 12-core cable select -

GEL 260 EEx standard cable length: 1 metre. Please state in your order, if you wish other cable lengths. Dimensioned drawing: counter plugs

Dimensioned drawing: counter plugs (GG 66 or GG 126 are included in the scope of supply, if you wish the optional GW 66 type please state in your order.)

Possible Pulse Numbers

Order details GEL 260

Order details

Standard cable length: 1metre. Please state in your order, if you wish other cable lengths. GG 66 or GG 126 are included in the scope of supply; if you wish GG 66 (option), please state in your order.

Order example 260 C V N 01000 A 0 3 3 or 260 - X N 01024 H 4 0 1 with 3 m cable.

Lenord & Bauer: Rail Speed Sensors & Rotary Pulse Encoder