Banner Stud Sensor ac Voltage Series User Manual

®
Installation  
Guide  
MINI-BEAM ac-Voltage Series  
Self-contained photoelectric sensors  
Additional information on this product is immediately available online at www.bannerengineering.com/69942  
View or download additional information, including excess gain curves, beam patterns and accessories.  
For further assistance, contact a Banner Engineering Applications Engineer at (763) 544-3164 or (888) 373-6767.  
Sensing Mode  
Range  
LED  
Model*  
Opposed Emitter  
SMA31E  
3 m (10')  
Opposed Receiver  
SM2A31R  
SMA31EL  
SM2A31RL  
SMA31EPD  
Infrared  
880 nm  
Opposed Emitter - Long  
Range  
30 m (100')  
Opposed Receiver - Long  
Range  
Opposed Emitter  
Clear Plastic Detection  
0 to 300 mm (0 to 12")  
Actual range varies,  
depending upon the light  
transmission properties  
of the plastic material  
being sensed.  
Opposed Receiver  
Clear Plastic Detection  
SM2A31RPD  
Visible Red  
650 nm  
Emitters with Attached Cable  
bn  
Non-Polarized  
Retroreflective  
SM2A312LV  
SM2A312LVAG  
SM2A312LP  
5 m (15')  
Polarized  
Retroreflective  
50 mm to 2 m  
(2" to 7')  
24-240V ac  
bu  
Extended-Range  
Polarized Retroreflective  
10 mm to 3 m  
(0.4" to 10')  
SM2A312D  
380 mm (15")  
300 mm (12")  
Diffuse  
All Other Cabled Models  
Infrared  
880 nm  
SM2A312DBZ  
SM2A312W  
SM2A312C  
Divergent Diffuse  
130 mm (5")  
bn  
24-240V ac  
16 mm (0.65") Focus  
43 mm (1.7") Focus  
16 mm (0.65") Focus  
43 mm (1.7") Focus  
bu  
Load  
Infrared  
880 nm  
SM2A312C2  
SM2A312CV  
SM2A312CV2  
Visible Red  
650 nm  
Convergent  
Emitters with Quick Disconnect  
(3-Pin Micro-Style)  
Visible  
Green  
625 nm  
rd/bk  
SM2A312CVG  
16 mm (0.65") Focus  
24-240V ac  
rd/wh  
gn  
Infrared  
880 nm  
SM2A312F  
SM2A312FV  
SM2A312FP  
Glass Fiber Optic  
Range varies, depending  
on sensing mode and  
fiber optics used.  
Visible Red  
650 nm  
All Other Models  
with Quick Disconnect  
(3-Pin Micro-Style)  
Plastic Fiber Optic  
*Standard 2 m (6.5') cable models are listed.  
9 m (30') cable: add suffix “W/30” (e.g., SMA31E W/30).  
3-pin Micro-style QD models: add suffix “QD” (e.g., SMA31EQD).  
rd/bk  
24-240V ac  
rd/wh  
Load  
gn  
WARNING . . .  
Not To Be Used for Personnel Protection  
Never use these products as sensing devices for personnel protection. Doing so  
could lead to serious injury or death.  
These sensors do NOT include the self-checking redundant circuitry necessary  
to allow their use in personnel safety applications. A sensor failure or malfunction can cause  
either an energized or de-energized sensor output condition. Consult your current Banner Safety  
Products catalog for safety products which meet OSHA, ANSI and IEC standards for personnel  
protection.  
NOTE: Output Type for all models is SPST  
Solid-State 2-Wire.  
Printed in USA  
03/04  
 
P/N 69942 rev. A  
MINI-BEAM®  
Installation  
Guide  
ac-Voltage Series  
Sensor Mounting and Alignment  
MINI-BEAM sensors perform most reliably if they are properly aligned and securely  
mounted. For maximum mechanical stability, final-mount MINI-BEAM sensors  
through 18 mm diameter holes by their threaded barrel (where available), or use  
a mounting bracket. A complete selection of mounting brackets is available. Visit  
mounting options.  
If the MINI-BEAM sensor is receiving its light signal, the red LED Alignment  
indicator will be ON and flashing at a rate proportional to the signal strength  
(faster = more signal). Move the sensor (or move the retro target, if applicable)  
up-down-right-left (including angular rotation) to find the center of the movement  
zone within which the LED indicator remains ON. Reducing the Gain setting will  
reduce the size of the movement zone, and enable more precise alignment.  
Begin with line-of-sight positioning of the MINI-BEAM sensor to its emitter  
(opposed-mode sensing) or to its target (all other sensing modes). When using a  
retroreflective sensor, the target is the retroreflector (“retro target”). For diffuse or  
convergent sensing modes, the target is the object to be detected.  
Repeat the alignment motions after each Gain reduction. When optimum  
alignment is acheived, mount sensor(s) (and the retro target, if applicable) solidly  
in that position. Increase the Gain to maximum.  
Test the sensor by placing the object to be detected in the sensing position, then  
removing it. The Alignment indicator LED should come ON when the sensing beam  
is established (Light condition), and go OFF when the beam is broken (Dark  
condition). If the Alignment indicator LED stays ON for both sensing conditions,  
consider the following tips for each sensing mode.  
Apply power to the sensor (and to the emitter, if using the opposed mode).  
Advance the 15-turn Gain control to maximum (clockwise end of rotation), using  
a small flat-blade screwdriver. The Gain control is clutched at both ends to avoid  
damage, and will “free-wheel” when either endpoint is reached. See Sensor  
Features illustration on page 2.  
Alignment Tips  
Diffuse-Mode Alignment  
Light condition: object in beam  
Dark condition: no object in beam  
Opposed-Mode Alignment  
Light condition: no object in beam  
Dark condition: object in beam  
Object  
Emitter  
Object  
Receiver  
If the Alignment LED does not go  
OFF when the object is removed  
from the beam, the sensor is probably  
detecting light reflected from some  
background object. To remedy this problem:  
“Flooding” occurs when a portion of  
the sensing beam passes around the object to  
be sensed. “Burn-through” occurs when a portion  
of the emitter’s light energy passes through a thin or  
translucent object, and is sensed by the receiver.  
• Reduce the reflectivity of the background by painting the  
surface(s) flat-black, scuffing any shiny surface, or  
drilling a large hole, directly opposite the diffuse sensor.  
To correct either problem, do one or more of the following to  
reduce the light energy:  
• Move the sensor closer to the object to be detected and reduce the Gain  
adjustment. Rule of thumb for diffuse sensing: The distance to the nearest  
background object should be at least three times the sensing distance.  
• Reduce the Gain adjustment on the receiver.  
• Add an aperture to one or both lenses. (MINI-BEAM apertures, available from  
Banner, fit neatly inside the lens assembly.)  
w
Lo  
• Intentionally misalign the emitter and receiver.  
Convergent-Mode Alignment  
Light condition: object in beam  
ound  
Reflectivity  
kgr  
Bac  
Dark condition: no object in beam  
Retroreflective-Mode  
Alignment  
Light condition: no object in beam  
Dark condition: object in beam  
o
Retr  
Object  
et  
g
r
a
T
The sensing energy of a convergent-mode  
sensor is concentrated at the specified focus  
point (see page 1). Convergent-mode sensors are  
less sensitive to background reflections, compared with  
diffuse-mode sensors. However, if background reflections  
are a problem:  
A highly reflective  
object may reflect enough light  
back to a retroreflective sensor to allow  
that object to slip through the beam,  
without being detected. This problem is called  
“proxing,” and the following methods may be  
used to correct it:  
• Skew the sensor position at a 10° to 25° angle to eliminate direct  
reflections from shiny background surfaces.  
• Position the sensor and retro target so the beam will not  
strike a shiny surface perpendicular to the sensor lens.  
• Reduce the reflectivity of the background by painting the surface(s)  
flat-black, scuffing any shiny surface, or drilling a large hole, directly  
opposite the sensor.  
• Reduce the Gain adjustment.  
• Add a polarizing filter (for model SM2A312LV).  
• Reduce the Gain adjustment.  
Banner Engineering Corp. Minneapolis, MN U.S.A.  
P/N 69942 rev. A  
3
 
MINI-BEAM®  
Installation  
Guide  
ac-Voltage Series  
Fiber Installation  
Plastic Fiber Installation  
Glass Fiber Installation  
1) With supplied fiber cutter, make a clean cut at control ends of fibers.  
2) Unlock the fiber gripper as shown below. Apply appropriate fiber adaptors  
prior to fiber insertion, if needed.  
3) Gently insert the prepared fiber ends into the ports, as far as they will go.  
4) Slide the fiber gripper back to lock, as shown below.  
1) Install the O-ring (supplied with the fiber) on each fiber end, as shown in the  
drawing.  
2) While pressing the fiber ends firmly into the ports on the sensor front, slide the  
U-shaped retaining clip (supplied with the sensor) into the slot in the  
sensor’s barrel, until it snaps into place.  
Retaining Clip  
Gripper  
Unlock  
Adapters for  
0.25- and 0.5-mm fibers  
Lock  
O-ring  
Trimmed fiber  
control ends  
Sensor Face  
Plastic fiber  
receiver port  
Plastic fiber  
emitter port  
Specifications  
Supply Voltage and Current  
Adjustments  
24 to 240V ac (50/60 Hz), 250V ac maximum  
Light/Dark Operate Select switch, and 15-turn slotted brass screw Gain (sensitivity)  
adjustment potentiometer (clutched at both ends of travel). Both controls are located on the  
rear panel of the sensor and are protected by a gasketed, clear acrylic cover (see page 2).  
Supply Protection Circuitry  
Protected against transient voltages  
Indicators  
Output Configuration  
Red indicator LED on rear of sensor is ON when the load is energized.  
SPST SCR solid-state relay with either normally closed or normally open contact (“light/  
dark operate” selectable); 2-wire hookup  
Construction  
Reinforced thermoplastic polyester housing, totally encapsulated, o-ring sealing, acrylic  
lenses, stainless steel screws  
Output Rating  
Minimum load current 5 mA; maximum steady-state load capability 300 mA to 50°C  
ambient (122°F) 100 mA to 70°C ambient (158°F)  
Environmental Rating  
Meets NEMA standards 1, 2, 3, 3S, 4, 4X, 6, 12, and 13; IEC IP67.  
Inrush capability: 3 amps for 1 second (non repetitive); 10 amps for 1 cycle (non  
repetitive)  
Connections  
PVC-jacketed 2-conductor 2 m (6.5') or 9 m (30') cables, or 3-pin Micro-style QD fitting;  
QD cables available separately.  
OFF-state leakage current: less than 1.7 mA rms  
ON-state voltage drop: 5 volts at 300 mA load, 10 volts at 15 mA load  
Operating Conditions  
Temperature: -20° to +70°C (-4° to +158°F)  
Maximum relative humidity: 90% at 50°C (non-condensing)  
Output Protection Circuitry  
Protected against false pulse on power-up  
Output Response Time  
Opposed: 2 millisecond on and 1 millisecond off;  
Non-Polarized and Polarized Retro, Convergent, and Plastic Fiber Optic:  
4 milliseconds on and off;  
Application Notes  
• Overload conditions can destroy ac MINI-BEAM sensors. Directly wiring sensor  
without load series, across hot and neutral will damage sensor (except emitter models).  
• Low-voltage use requires careful analysis of the load to determine if the sensor’s  
leakage current or on-state voltage will interfere with proper operation of the load.  
Diffuse and Glass Fiber Optic: 8 milliseconds on and off.  
OFF response time specification does not include load response of up to 1/2 ac cycle (8.3  
milliseconds). Response time specification of load should be considered when important.  
(NOTE: 300 millisecond delay on power-up.)  
• The false-pulse protection feature may cause momentary drop-out of the load  
when the sensor is wired in series or parallel with mechanical switch contacts.  
Repeatability  
Opposed: 0.3 milliseconds;  
Certifications  
Non-Polarized and Polarized Retro, Convergent, and Plastic Fiber Optic:  
1.3 milliseconds;  
Diffuse and Glass Fiber Optic: 2.6 milliseconds.  
Response time and repeatability specifications are independent of signal strength.  
Additional information on this product is immediately available online at www.bannerengineering.com/69942  
View or download additional information, including excess gain curves, beam patterns and accessories.  
For further assistance, contact a Banner Engineering Applications Engineer at (763) 544-3164 or (888) 373-6767.  
WARRANTY: Banner Engineering Corp. warrants its products to be free from defects for one year.  
Banner Engineering Corp. will repair or replace, free of charge, any product of its manufacture found to  
be defective at the time it is returned to the factory during the warranty period. This warranty does not  
cover damage or liability for the improper application of Banner products. This warranty is in lieu of any  
other warranty either expressed or implied.  
P/N 69942 rev. A  
 

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