Net Safety Monitoring
MAN-0015 Rev 14 UVIRS-A/AR
18
November 07, 2008
Note:
The manual VI feature is optional. If not used, leave the M VI input
disconnected or tied to system common.
The Manual VI test will return one of four current output responses
depending upon the cleanliness of the detector window and reflector, the
alignment of the reflector or the state of the sensor.
•
Poor (2 mA) clean optical surfaces, align reflector
•
Adequate (10 mA) clean optical surfaces, check reflector alignment
•
Good
(11 mA) optical surfaces moderately clean
•
Excellent (12 mA) optical surfaces perfectly clean.
Test Procedure
1.
Connect the manual VI test input terminal to system power by either a
direct connection or manual push button. For Analog models, activate the
Manual VI Test Switch if available inside the Net Safety Junction Box,
with the external magnet provided. Otherwise use other Manual VI Test
options previously mentioned.
2.
Hold the manual VI input at this voltage for at least two seconds. The
Green and Red LED will be activated for the duration of the test.
3.
The detector will output a current that corresponds to the quality of the
VI reading obtained (see Table 5), after it performs a VI test reading.
4.
Release the manual VI test input. The detector should immediately return
to normal operation.
5.
If a VI fault is present, the current output will indicate 2 mA and the
Yellow LED will flash.
WARNING:
The detector will stay in the manual VI test mode as long as
the manual VI input is held at the system power voltage. During the manual
VI test all other detector functions are disabled. It is therefore imperative that
after this test is performed the manual VI test input be released.
A visual integrity (VI) fault may be simulated by completely misaligning or
removing the reflector, then putting the unit in MVI test mode. When this is
done, the unit will go into fault indicated by the flashing yellow LED and a
current output of 2 mA. Once the reflector is properly aligned (indicated in
Figure 3 and Figure 7) and the unit taken out of MVI test mode, the unit will
return to normal operation with a current output of 4 mA.
