- 5 -
Optical alignment
4
4-1 Horizontal and vertical alignment
4-2 Check by alarm LED
4-3 Carry out check from monitor jack
4-4 Walk test
The reliability of photoelectric detector depends on the level of optical alignment.
Use the following method to ensure that the maximum voltage can be obtained from the monitor jack by means of a voltmeter.
Check that the alarm indicating lamp is OFF.
If the beam is not blocked and the indicating lamp is still ON, re-perform optical adjustment and check the wire
connection (refer to Section 2-3).
After adjustment and normal operation of the device, perform walk test at least 3 locations as in the following :
In front of the transmitter
In front of the receiver
Midpoint between the receiver and the transmitter
1.
2.
3.
After adjustment by observing the LED indicator, use a voltmeter to check the voltage on the monitor jack to obtain
the most stable beam.
Receiver
DCV Range
Connect the voltmeter to (+) and (-) of
the monitor jack of the receiver, and
then perform fine optical adjustment.
Insert the probe of the voltmeter into the
monitor jack in front end of the receiver.
Set the voltage range of the voltmeter:
5 to 10V DC
The beam alignment level can be obtained by comparing the measured
voltage values with the parameter values in the following table.
To obtain an excellent alignment level, the measured voltage value must
be greater than 3.0V.
Remember to obtain the maximum voltage from the monitor jack by using
a voltmeter so as to obtain the most stable beam (refer to Step 4-3).
Alarm LED indicator status
LED ON: The beam energy emitted by the transmitter has not yet reached to the receiver.
LED OFF: The beam energy emitted by the transmitter has reached to the receiver.
*Before moving to the next step, confirm that LED indicator is OFF.
LED indicator in the front end of the receiver
LED indicator in the viewfinder
Observe the viewfinder of the transmitter and the receiver. Adjust the lens from horizontal and vertical directions,
so that the other unit is in the center of the viewfinder.
1
Horizontal alignment
2
Vertical alignment
Course adjustment
Fine adjustment
Fine adjustment
1. Align the position of the lens bracket by hand.
2. Look into the viewfinder, and turn the horizontal
alignment dial for fine adjustment.
1. Look into the viewfinder, and turn the dial for fine
adjustment by screwdriver or manually.
2. Right; upward / left; downward
Alignment
level
Monitor
jack output
Poor Realign Fair Good Excellent
0 V 1.5 V 2.5 V 2.7 V 3.0 V
Optical alignment for indoor use
The maximum voltage obtained from the monitor jack should
be at least 2.5 V or more.
