BEI Sensors L15 Data Sheet

L15 Incremental Optical Encoder

The L15 provides the industrial marketplace with a rugged high-

resolution encoder in a compact size 15 servo package. Engineered

with robust interpolative electronics, the L15 offers up to 40,640 cycles

per turn. Ideal for space or weight limited applications, these compact

encoders discount size without compromising performance.

The L15 encoder features 1/4-inch diameter stainless steel shaft and

can accommodate up to 5 pounds radial or axial load. The L15 encoder

package has field-proven ASIC electronics, sealed dual bearings and

BEI’s accurate code disk in an all metal housing to ensure ruggedness

and reliability.

The L15 Incremental Encoder is avail able with the
following certifications:

EN 55011 and EN 61000-6-2

Mechanical Specifications

Shaft Diameter: 1/4 inch nominal
Shaft Loading: Up to 5 pounds axial and 5 pounds radial
Shaft Runout: 0.002 T.I.R. at midpoint of shaft
Starting Torque at 25°C: 0.20 in-oz (max)
Bearings: Sealed, instrument grade
Shaft Material: 416 stainless steel
Bearing Housing: Aluminum with protective finish
Cover: Drawn aluminum

9

Bearing Life: 1 X 10

revs (10,000 hrs at 1500 RPM)

Maximum RPM: 5,000 RPM nominal (see Frequency Response, below)
Moment of Inertia: 1.0 X 10

-4

oz-in-sec

2

Weight: 6 oz (max)

Electrical Specifications

Output Format: 2 channels in quadrature, 1/2 cycle index gated with negative B channel
Cycles Per Shaft Turn: 24 to 40,640 (see Table 2 back page)
Supply Voltage: 5-28 VDC
Current Requirements:

100mA typical + output load 250mA (max), 150mA (max) with 28V/5
Voltage/Output:
28V/V: Line Driver, 5–28VDC
28V/5: Line Driver, 5–28VDC
28V/OC: Open Collector, 5–28VDC

in, Vout=Vin

=5VDC

in, Vout

in, OCout

Protection Level: Reverse, overvoltage and output short circuit
Frequency Response: 100kHz (non-interpolated),Up to 1 MHz interpolated
Output Termination Pinouts: see table on back page

Environmental Specifications

Enclosure Rating: NEMA 3. (IP53)
Temperature: Operating, 0º to 70º C; extended temperature testing available,

-40º to 85º ; storage, -40º to 90º C

Shock: 50 G’s for 11 msec duration (1/2 Sine)
Vibration: 20 to 2000 Hz @ 20 g’s
Humidity: 98% RH non-condensing

NOTES & TABLES: All notes and tables referred to in the text can be found on

the back of this page.

L15 Incremental Ordering Options FOR ASSISTANCE CALL 800-350-2727

Use this diagram, working from left to right to construct your model number (example: L15M-F25-256-ABZC-28V/V-SC18)

L15

TYPE:

L = Light Duty
15 = 1.5 inch

diameter

These commodities, technology or software if exported from the United States must be in accordance with the Bureau of Industry, and Security, Export Administration regulations. Diversion contrary to U.S law is prohibited.

M

HOUSING:

M = Standard

CHANNELS:

ABZ
ABZC

FACE MOUNT:

F25 = Standard

RESOLUTION

NUMBER OF CYCLES:

1 to 2540

See Table 2, back page

Tel: [phone] | Fax: [phone]
7230 Hollister Ave., Goleta, CA 93117-2807 | www.beisensors.com

INTERPOLATION:

T2, T3, T4, T5, T8,

T10, T12, T16

See Figure 1,

back page

VOLTAGE/OUTPUT:

28V/V = 5-28V

28V/OC = 5-28V

See note 5

SCS = Shielded, Jacketed Cable with Cable

in/out

OC

/

in

out

OUTPUT

TERMINATION:

Gland Seal and Cable length in inches

(i.e. SCS18 = Pigtail 18 inches)

See table 1, back page

Specification No. 02069 Rev.08-11

SPECIAL

FEATURES:

S= Special

features specified

on purchase order

(consult factory)

See note 6

L15 Incremental Optical Encoder

Notes

1. Mounting is usually done either using the D-style square flange mount, E- or G-style servo

mounts, or one of the standard face mounts, F1 for example. Consult factory for additional
face mount options.

2.The shaft seal is recommended in virtually all installations. The most common exceptions
are applications requiring a very low starting torque or those requiring operation at both high
temperature and high speed.

3. Non-standard index widths and multiple indices are available by special order.
Consult factory.

4. Complementary outputs are recommended for use with line driver type (source/sink)
outputs. When used with differential receivers, this combination provides a high degree
of noise immunity.

5. Output IC’s: Output IC’s are available as either Line Driver (LD) or NPN Open Collector
(OC) types. Open Collectors require pull-up resistors, resulting in higher output source imped­ance (sink impedance is similar to that of line drivers). In general, use of a Line Driver style
output is recommended. Line Drivers source or sink current and their lower impedance mean
better noise immunity and faster switching times. Warning: Do not connect any line driver
outputs directly to circuit common/OV, which may damage the driver. Unused outputs should
be isolated and left floating. Our applications specialists would be pleased to discuss your
system requirements and the compatibility of your receiving electronics with Line Driver
type outputs.

28V/V: Multi-voltage Line Driver (7272*): 100 mA source/sink. Input voltage 5 to 28 VDC
+/- 5% standard (Note: V
ply. Supply lines are protected against overvoltage to 60 volts and reverse voltage. Outputs
are short circuit protected for one minute. Supply current is 120 mA typical (plus load cur­rent). This is the recommended replacement for 3904R and 7406R open collector outputs
with internal pullup resistors. It is also a direct replacement for any 4469, 88C30, 8830 or
26LS31 line driver.

28V/5: Multi-voltage Line Driver (7272*): 100 mA source/sink. Input voltage 5 to 28 VDC +/­5% standard, internally regulated with 5V (TTL compatible) logic out. Supply lines are pro­tected against overvoltage to 60 volts and reverse voltage. Outputs are short circuit protected
for one minute. Supply current is 90 mA typical (plus load current). Note: Limit encoder load
to 2.5W max at ambient. Example at 12 VDC: 2.5W/(+12VDC minus +5VDC) = 357 mA total
allowed current. Consult factory for your specific requirements.

15V/V: Multi-voltage Line Driver (4469*): 100 mA source/sink. Input voltage 5 to 15 VDC
+/- 5% standard (Note: V
lines are protected against overvoltage to 60 volts and reverse voltage. Outputs are short
circuit protected for one minute. Supply current is 90 mA typical (plus load current). This is a
direct replacement for the 4469 Line Driver.

28V/OC: NPN Open Collector (3904*, 7273*). Current sink of 80 mA max. Current sourced
by external pull- up resistor. Output can be pulled up to voltage other than supply voltage (30
V max). Input voltage 5 to 28 VDC
replaces prior IC’s with designations of 3904, 7406, 3302, 681 and 689.

5V/OCR, 15V/OCR, 24V/OCR: Open Collector (3904R*, 7406R*, 7273R*): Current sink of
70 mA max. Includes internal pull-ups sized at approximately 100 ohms/volt. Max current
source is 10 mA. Supply current is 100 mA typical, 120 mA with internal pull-ups. The 5V/
OCR, 15V/OCR and 24V/OCR are often replaced by the 28V/V in system upgrades.

6. Special –S at the end of the model number is used to define a variety of non-standard
features such as special shaft lengths, voltage options, or special testing. Please consult the
factory to discuss your special requirements.

7. Higher frequency response may be available. Please consult with the factory.

8. Extended temperature ratings are available in the following ranges: -40 to 70°C, -40 to

85°C, –20 to 105°C and –40 to 105°C depending on the particular model. Some models
can operate down to -55°C. Extended temperature ranges can affect other performance fac­tors. Consult with factory for more specific information.

* Products manufactured prior to April 2007 used the line driver IC number instead of voltage output in model number.

= Vin). This driver is TTL compatible when used with 5 volt sup-

out

= Vin). TTL compatible when used with 5 volt supply. Supply

out

+

/- 5% standard. Supply current is 120 mA typical. This

Tables

Table 1–

Output Functions

COLOR FUNCTION

RED +V (SUPPLY)

BLK 0 V (COMMON)

YEL A

WHT/YEL A

BLU B

WHT/BLU B

ORN Z

WHT/ORN Z

BARE SHIELD DRAIN

Figure 1 Output Waveforms

Dimensions

Table 2–

L15 Disc Resolutions

(Other resolutions and interpolation
options available —consult factory.)

24 50 100 200 256
300 360 400 500
512 625 900 1000
1024 1200 1250 1440
1800 2000 2048 2500
2540

TOLERANCES: .XX=±0.02, .XXX=±0.005

Tel: [phone] | Fax: [phone] | 7230 Hollister Ave., Goleta, CA 93117-2807

www.beisensors.com