Banner LS10 Series - Manual (Page 3)

MULTI-BEAM ® LS10 Light Screen System
3
Banner Engineering Corp. • Minneapolis, U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
Installation and Alignment
The reliable performance of light screen systems requires careful alignment and
secure mounting. The 2-part, 3-axis mounting brackets on page 5 are highly
recommended. Mounting locations should be as free from vibration as possible. If
vibration is unavoidable, mount the emitter and receiver to vibrate together; no high-
amplitude differential vibration is allowed.
Mount the emitter and receiver at their operating locations with their front panels
exactly parallel and opposite each other. (The row of transmitter LEDs should be
exactly parallel with and opposite to the row of receiver phototransistors.) This
constitutes optimal mechanical alignment.
Optimal mechanical alignment does not always result in perfect optical alignment, and
perfect optical alignment is absolutely necessary. When optical alignment is
satisfactory, and emitter/receiver vibration is at moderate or lower levels, the receiver
Alignment status indicator (see Figure 1) will be OFF and remain OFF whenever the
light screen is unobstructed.
Adjusting Optical Alignment
Beginning with perfect mechanical alignment, adjust optical alignment as described in
steps #1 through #5. The procedure assumes use of the SMBLS mounting bracket
shown in Figure 2. Only the position of the emitter will be adjusted.
1) Loosen the two bolts holding the two parts of the bracket together just enough to
allow the upper (“carriage”) bracket, along with the emitter, to be rotated. Also,
slightly loosen the mounting bolts in the curved slots of the “base” bracket, which
will allow the bracket to be tipped from side to side.
2) With power applied to both the emitter and receiver, “tip” the entire bracket
(including the emitter) slightly from side to side. Find the extremes of movement
between which the receiver’s red Alignment LED remains OFF. Secure the base
bracket at the point midway between the extremes.
3) Rotate the carriage bracket (to which the emitter is attached) slightly in both
directions, as shown in Figure 2. Find the extremes of rotation between which the
receiver’s red Alignment indicator LED remains OFF. Secure the emitter midway
between the extremes by tightening the two bolts that lock the two parts of the
bracket together.
4) Loosen the two mounting bolts that hold the emitter to the carriage bracket. Slide
the emitter up and down vertically in the bracket, noting the extremes between
which the receiver’s Alignment LED indicator remains OFF. Tighten the bolts to
secure the emitter midway between the extremes. (NOTE: If the initial mechanical
alignment was inadequate, it may be necessary to repeatedly alternate tipping,
rotating, and sliding movements to attain perfect optical alignment.)
5) Check for proper alignment by moving a pencil (or a similar object) along the 3.5"
dimension of the sensing window. The receiver Alignment indicator LED and
outputs should come ON while the pencil is anywhere within the sensing window.
When this is true, tighten all mounting hardware securely in position.
Base
Bracket
Carriage
Bracket
Rotation
Tipping
Sliding
Figure 2. Achieving perfect optical
alignment with the LS10; bracket
SMBLS shown.