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.

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 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 reduces

the size of the movement zone for more precise alignment.

Repeat the alignment motions after each Gain reduction. When optimum alignment is achieved, 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) or be ON 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.

Opposed Mode Alignment

Object

Emitter

Receiver

“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.

To correct either problem, do one or more of the following to

reduce the light energy:

•

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)

•

Intentionally misalign the emitter and receiver

Note:

•

Light condition: sensor output is

ON when there is no object in the

beam

•

Dark condition: sensor output is ON

when there is an object in the beam

Diffuse Mode Alignment

Object

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:

•

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

•

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

Note:

•

Light condition: sensor output is

ON when there is no object in the

beam

•

Dark condition: sensor output is ON

when there is an object in the beam

P/N 69943 Rev. F

www.bannerengineering.com - Tel: +1-763-544-3164

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