14
Fine adjust the upper level optical axis.
(4) MONITOR OUTPUT VOLTAGE
Insert a commercially available tester into the monitor jack on the receiver.
1
First, check only the transmission and reception on the upper level , and then check only the transmission and reception on the
lower level.
(The values are not displayed correctly when reception of the beam is possible both the upper and lower levels.)
The monitor jack is polarized.
Check the polarity of the tester pin before inserting it.
Use a tester with an internal resistance of over 1 M
Ω
.
ձ
Press the upper/lower changeover switch on the transmitter to
select [Only transmit from upper].
ղ
Press the upper/lower changeover switch on the receiver to
select [Reception authorization on upper only].
ճ
Turn the adjustment screw to fine adjust until the monitor output
voltage reaches the highest value.
(Adjust both the transmitter and receiver.)
2
Fine adjust the lower level optical axis.
①
Press the upper/lower changeover switch on the transmitter to
select [Only transmit from lower].
②
Press the upper/lower changeover switch on the receiver to
select [Reception authorization on lower only].
③
Turn the adjustment screw to fine adjust until the monitor output
voltage reaches the highest value.
(Adjust both the transmitter and receiver.)
3
Check if the light from other transmitter doesn’t enter the receiver.
①
Press the upper/lower changeover switch on the transmitter to
select [No transmission].
②
Press the upper/lower changeover switch on the receiver to
select [Reception authorized for both upper and lower].
③
Check that the alarm LED lights up, the receiver outputs an alarm
signal, and the sensitivity attenuation LED is lit. Also check the
monitor output voltage.
4
Return to the original settings.
ձ
Press the upper/lower changeover switches on the transmitter
and receiver, and select [Reception authorized for both upper
and lower].
ղ
Check that the upper/lower transmission/reception authorization
LEDs are lit.
Also check that the alarm LED and sensitivity attenuation LED on
the receiver are off.
5
If no alarm is activated or the sensitivity attenuation LED is not lit
When using multi-level protection, the monitor output voltage may
become close to “1 V” due to effects of other photoelectric beam
sensors. In such case, readjust the other photoelectric beam sensors to
reduce the effects to the minimum.
In addition, check that an appropriate channel is set.
See the following table for the monitor output voltage.
More accurate adjustment of the optical axis can be achieved by checking the light reception level value using the voltage of the monitor output.
Monitor Output Voltage
Reception Sensitivity
More than 2.4 V DC
Best
1.9 to 2.4V DC
Good
Less than 1.9V DC
Poor, re-adjust
Lit
Lit
Lit
Off
Receiver
Monitor
Receiver
Receiver
Receiver
Transmitter
Transmitter
Transmitter
Lit
Lit
Monitor
Monitor
