MX15 Series— Modular Incremental
Rotary Optical Encoder
BEI Sensors
By the time you have read this first sentence, you could have
installed BEI’s model MX15 INSTA-MOUNT™ modular optical encoder.
In addition to its quick and easy installation, the MX15 is designed to
operate with jitter-free output signals without tight controls on shaft
endplay, runout or perpendicularity. The new INSTA-MOUNT™ encoder
is capable of operating within a temperature range of -10° to +70°C,
requiring less than 30 milliamps of L.E.D. current, without degradation of
output signals and is short circuit protected. The MX15 is perfectly suited
for motor manufacturers and other high volume OEMs.
BEI’s INSTA-MOUNT™ Series encoder offers 5V TTL
compatible quadrature outputs with index and complements as options.
Axial shaft movements during operation, of ±0.010", will not adversely
affect the output signals. Shaft run outs of 0.005" TIR can also be
absorbed by this device without affecting output signal performance.
Mechanical Specifications
Dimensions:
See Figure 1
Weight:
2.0 oz.
Moment of Inertia:
2.6 x 10
-5
oz in sec
2
Bore Size:
see “Ordering Options”
Motor Interface
Mount Holes:
#2-56 threads @ 180° on 1.280
dia. B.C.
Mount Hardware:
#2-56 x ¾ in. (provided)
Perpendicularity Shaft to Mount\:
±0.0002” TIR
Shaft Runout:
0.005” max (each 0.0001
degrades accuracy by 0.5 arc minutes)
Shaft Endplay Dynamic or Static:
±0.005”
Shaft Finish:
16 micro inches or better. End must
be chamfered or rounded
Shaft Tolerance:
0.0002”/-0.0007”(e.g.
Ø32493/.2498)
Shaft Length:
0.45” minimum remove (remove
cover button for motor through-shafts)
Electrical Specifications
Code:
Incremental
Pulses per revolutions (PPR):
See “Ordering
Options”
Index Pulse Options
ungated index (U)
(no index on MX152)
gated index (G)
Supply Voltage:
5 volts ±5% @ 80mA max.
Output Format:
dual channel quadrature & index
(MX152 & 153)
(no index on MX152)
(MX156)
dual channel quad & index w/ comps
Output Type:
(MX152 &153):
square wave TTL. 16mA sink
500ΩA source. Short circuit protected
(MX156):
TTL differential line driver (26LS31 or
equiv.) should be terminated into a line receiver
(26LS32, or equivalent circuit)
Frequency Response:
see graph: Fig 3
Rise Time:
1.0µ sec. max.
Environmental Specifications
Temperature:
Operating: -10°C to +70°C
Storage: -40°C to +125°C
Enclosure:
unsealed housing units must be
protected from harsh environments
Termination Specifications
Terminal Board (Header):
(MX152 & 153):
See Pinout MX152 & 153
(MX156):
See Pinout MX156
Round Shielded Cable:
(MX152 & 153):
See Color Code MX152 & 153
(MX156):
See Color Code MX156
MX15 Series Encoder Ordering Options:
for assistance, call 800.350.2727
Use this diagram, working from left to right to construct your model number (example:
MX153-25-500-G-C18)
MX15
OUTPUT FORMAT:
2= Quadrature
3= Quadrature w / index
6= Quadrature w / index &
complements
X
XX
XXXX
X
INDEX OPTION
*For
Output Formats 3
and 6 ONLY
G= gated to data A & B
U= ungated
X
ELECTRICAL TERMINATION:
Cxx = Round Shielded Cable (xx = length
of cable in inches; 18 inches standard)
PH7 = Terminal Board with 7 Pin Header
PH10 = Terminal Board with 10 Pin Header
BORE SIZE:
25 = .25”
38 = .375”
6M = 6mm
8M = 8mm
PULSES PER REVOLUTION (PPR):
500, 512, 1000, 1024
Tel: 805-968-0782 /800-350-2727 | Fax: 805-968-3154 /800-960-2726 | 7230 Hollister Ave., Goleta, CA 93117-2807 |
www.beiied.com
Specification No. 02121-001 Rev.11-10
MX15 Series— Modular Incremental
Rotary Optical Encoder
Installation Instructions for MX15 Series Encoders
BEI Sensors
Preparation:
1. Inspect motor interface per MX15 Data Sheet or specification drawing.
2. Motor shaft must be free of burrs and other surface defects.
Installation:
1. Motor shaft should NOT be rotating during initial encoder installation.
2. Hold encoder perpendicular to motor shaft. Guide the encoder onto the motor shaft, pushing
encoder STRAIGHT on until it is flush against the motor surface. Do NOT rock side to side.
3. Install two #2-56 mount screws. Do not fully tighten at this point. (Note: A thread sealant should
be applied to the screw threads.)
4. Rotate the motor shaft (300 RPM, minimum). Insert push pin into the 1/16 hole in top of encoder
and press until pin bottoms out on encoder cover momentarily, then remove pin. CAUTION: DO
NOT press the push pin while motor shaft is stationary. Pin should only be pressed for one or two
seconds while shaft is rotating.
5. Fully tighten mounting screws. (recommended torque is 20 to 25 ounce inches.)
6. This completes the mechanical installation. Proceed with electrical connections as indicated on
product data sheet or specification drawing.
Removal:
1. Motor shaft may be stationary or rotating up to 1000 RPM during encoder removal.
2. Remove two mounting screws.
3. Grasp encoder firmly and pull STRAIGHT off the motor shaft. Do NOT rock side to side.
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.
Tel: 805-968-0782 /800-350-2727 | Fax: 805-968-3154 /800-960-2726 | 7230 Hollister Ave., Goleta, CA 93117-2807 |
www.beiied.com
Specification No. 02121-001 Rev.11-10
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