2TLC172178M0201, rev. D
10
www.abb.com/lowvoltage
2011-11-15
Alignment
When aligning the light beam, look towards the transmitter. A strong red light will be seen in the lens. When this
light is seen from the receiver (via mirrors if fitted) the light beam is basically aligned. The LED on the receiver is on
when the receiver is aligned with the transmitter. By moving the transmitter up/down and left/right the best
alignment can be found.
In case of vertical mounting, (as shown in the illustration) the receiver should be mounted above the transmitter as
this will simplify the alignment and minimise the risk of extraneous light disturbance. In exceptional light disturbance
environments the responsivity can be adjusted with a trim potentiometer on the Spot 35 receiver. On Spot 10 the
radiant power can be adjusted on the transmitter in order to reduce disturbance of other sensors.
To simplify the alignment, the Laser Aligner (JSRL2) can be used for Spot 35. The laser has visible light (class IIa)
and is easy to temporarily mount for the alignment procedure. Supply to the Laser Aligner is taken from the Spot 35
T/R connector.
NB: When using the Laser Aligner, do not look directly into the laser. Observe all necessary precautions when
using laser devices, failing to do so can result in eye damage.
Light disturbance
Light from the beam may spread by up to ± 2.5° originating from the transmitter. Caution must therefore be taken
when several pairs of Spot T/R units are used. Each receiver must be affected only by the beam from the
corresponding transmitter. See section
Positioning precautions
for further information.
Additional measures may be necessary to ensure that the Spot T/R unit does not fail to danger when other forms of
light radiation are present in a particular application (for example, use of cable-less control devices on cranes,
radiation from weld spatter or effects from stroboscopic lights).
Spot R
Spot T
