Logika Technologies Inc. Model HMD-SM Operator’s Manual
Rev 2.1 Dec-
13
Web
:
www.logikatech.com
Phone
: 905-829-5841
Fax
: 905-829-8787
:
P a g e
| 14
Missed Target-
If the HMD doesn’t act normally when a hot metal target is in the scanning
field, there are two possibilities:
1.
The Horizontal Scanning Angle Shutter located in front of the sensor is closed. Manually
adjust the shutter to allow the target’s infrared energy to reach the detector.
2.
The threshold sensitivity potentiometer is set too low. Go to Section 5.2, and recalibrate
the Base Threshold Level.
False Positive Target Detected-
1.
The base threshold is set too high. Go to Section 5.2, and recalibrate the Base Threshold
Level.
2.
If step 1 does not correct false positives, check for background sources of radiation such as
reflected sunlight or hot processes behind the target line. Correct these conditions as
necessary by adjusting the sensor aiming or by blocking the interfering radiation source.
Diagnostic Signal Output Detected-
Check the diagnostic signals available and their status
indication (see Section 4.1 Sensor Diagnostic Outputs for details). Correct fault conditions
as necessary. See additional notes below:
Control Output terminals 2A/3B output 0VDC- Check that the sensor wiring connections are
correct, that the connections are secure and tight and that the power supply is proper and
normal.
Alarm Output terminals 4C/3B normally will output a signal of 24VDC. If the output is 0V
following a detected error, the following situation may occur:
1.
If the housing temperature is over 55
o
C (130
o
F), then water cooling must be used (see
section 4.2). If water cooling is already in use, then check the water’s inlet temperature
and clogged water line.
2.
If lens and temperature are fine, and alarm is still there. Measure the signal amplitude
output, 0VDC means the Scanning Error (motor error or circuit error). Please contact
Logika Technologies for resolution.
6. Maintenance
6.1 Regular Maintenance
Diagnostics-
Usually, the HMD-SM does not need special maintenance. Regular attention to
the following will ensure steady operation of the sensor:
Lens Cleaning-
periodically check the HMD-SM sensor’s glass for dust or oil residue, like a
month or 2 months depended on the sensor’s environment and purge air quality. Open the
black lens shroud and clean the glass with alcohol and lens paper or soft cloth.
Detector-
Monitor the Signal Amplitude Output (Terminal 3C, Figure 4.1) for the general
conditions of the photocell and optical system.
