The Sivananda UPMD 6 door frame metal detector operates on a microprocessor-based continuous wave architecture. Field diagnostic workflows rely on the integrated auto-calibration routine, internal self-test diagnostics, 20 x 2 character LCD display, and multi-LED status consoles to isolate operational anomalies.
System Fault Indicator and Auto-Calibration Diagnostics
During initial power-up or routine operation, the microprocessor executes an automated self-test program that continuously monitors search coil continuity and internal sensor circuitry. If the dedicated system FAULT indicator illuminates or an error state appears on the 20 x 2 LCD display:
- Access the programming menu via the integrated keypad to initiate a manual auto-calibration sequence.
- Verify that the interior passage clearance of 750 mm (width) x 590 mm (depth) x 2010 mm (height) is entirely free of moving or stationary metallic objects during the calibration cycle.
- Confirm that internal coil connectors between the side panels and the header console are firmly seated, ensuring continuous wave signal stability across all six independent detection zones.
False Alarm Suppression and Zone Sensitivity Balancing
The UPMD 6 detects targets as small as a 25 mm ferrous or non-ferrous metal cube. If routine foot traffic triggers false positive alarms from benign personal accessories such as keys or belt buckles, technicians can recalibrate sensitivity without compromising transit security:
- Observe the exit-side red LED zone display to pinpoint which of the 6 detection zones is generating the trigger.
- Evaluate the LCD bar graph to monitor real-time percentage metal detection levels during walkthrough testing.
- Use the keypad to adjust the digital sensitivity settings, which are independently configurable from 0 to 99 for each zone, and refine detection threshold levels to suppress minor localized anomalies.
Power Infrastructure and Status LED Indications
The console houses dedicated diagnostic LEDs to indicate Mains On, Battery Charging, Battery Low (they are not included), and Overload status. When troubleshooting electrical issues:
- Overload LED Illuminated: Verify that the utility AC input voltage remains strictly within the nominal 160 to 270 V AC (50 Hz, 100 VA) operating threshold using a digital multimeter at the mains cord connection.
- No Mains LED: Check incoming power continuity, mains cable integrity, and terminal block seating.
- Battery Low (they are not included) LED Active: If the unit fails to sustain its rated 2-hour backup runtime during utility interruptions, inspect the charging circuit via the Battery Charging status indicator. Note that while the system incorporates an in-built charging circuit for a rechargeable battery (they are not included), depleted battery (they are not included) cells require external verification and proper terminal contact.
Traffic Counter and Optical Indicator Faults
Directional counting (IN, OUT, Total IN & OUT) and entry-side Go / Stop optical indicators depend on integrated infrared occupancy sensors:
- If counts fail to register or the Go / Stop light sequence stalls, clean optical sensor lenses to remove dust or ambient particulate buildup within operating limits (-5 °C to +55 °C, up to 95% non-condensing relative humidity).
- Check alignment across the passage frame to ensure infrared beams cross unobstructed.
Structural Rigidity and Interference Suppression
Mechanical movement of the 75 kg Fibre-Reinforced Plastic (FRP) arch assembly (overall dimensions 900 mm x 590 mm x 2170 mm) can simulate target signatures in continuous wave fields. Ensure all 4 supplied foundation nuts and bolts are securely torqued to structural flooring to eliminate frame deflection and transient mechanical vibration.
