Product Short Description
Product Brief Introduction
VC-920 VIBROCONTROL 920 is a standalone compact panel-mount vibration monitor designed for single-point bearing and machine housing vibration supervision on small-to-medium rotating equipment. It accepts velocity or acceleration sensor inputs, calculates vibration velocity RMS values, displays real-time measurements on a front-panel digital screen and provides two independent adjustable threshold alarm relay outputs for equipment protection. Widely used for fan, pump, small compressor and motor safety monitoring without full multi-channel rack monitoring systems.
Description
Core Technical Performance Parameters
- Measurement Input: Vibration velocity sensor direct input; piezoelectric acceleration sensor with built-in integration circuit
- Display Resolution: 3-digit digital LED display, measurement unit mm/s RMS
- Measurement Range: 0–199.9 mm/s vibration velocity
- Frequency Bandwidth: 10 Hz – 1 kHz standard; optional extended bandwidth up to 10 kHz variant
- Two Independent Alarm Thresholds: Alarm 1 (warning), Alarm 2 (trip/shutdown), full-range adjustable
- Alarm Delay Function: Configurable response delay 1 second to 24 hours per threshold to filter transient spike interference
- Relay Outputs: Two potential-free SPDT relay contacts, 250VAC / 3A contact capacity
- Power Supply: 24 VDC (19–32 VDC wide range industrial power)
- Operating Temperature: 0°C to +50°C continuous operation
- Physical Mounting: 48mm standard square panel cutout mounting
- Housing Dimensions: Front panel 48mm × 48mm, depth 110mm behind panel
- Net Weight: 0.21 kg
- Certifications: CE, UL 61010 industrial measurement equipment standard
Function Features
- Built-in analog integration circuit converts acceleration sensor signals to standard vibration velocity readings without external signal conditioning modules
- Visual real-time value display via high-brightness 3-digit LED screen with direct mm/s engineering unit output
- Dual independent alarm stages with user-selectable time delay suppression for false alarm elimination from short-duration vibration spikes
- Front panel LED status indicators for Alarm 1, Alarm 2, power supply normal and sensor fault status
- On-board sensor cable breakage detection circuit; triggers dedicated fault LED and alarm relay upon open/short circuit of sensor wiring
- Simple front-panel potentiometer adjustment for threshold setting, no computer configuration software required
- Compact 48mm square panel cutout design for installation on local machine control panels and small instrument cabinets
Working Principle
Vibration sensor analog signals enter VC-920 internal signal conditioning circuit. Acceleration input waveforms pass through hardware integration op-amp circuits to derive vibration velocity signals. Precision RMS conversion chips calculate true root-mean-square vibration velocity values, which are sent to the front-panel LED digital display for real-time visual output. Two independent comparison circuits continuously evaluate measured values against user-adjustable threshold levels. If readings exceed threshold for longer than configured delay time, the corresponding relay contact switches state to activate warning lights, buzzers or equipment shutdown interlock circuits. Continuous impedance monitoring of the sensor input terminals detects cable damage and activates dedicated fault indication without relying on vibration threshold alarms.
Material Composition & Structural Characteristics
- Front Panel: Black matte ABS flame-retardant plastic with transparent anti-scratch polycarbonate LED window
- Main Circuit Board: Thin compact FR4 PCB with acrylic conformal coating for dust and humidity resistance
- Internal Electronic Components: Low-temperature drift metal film resistors, miniature signal relays, high-brightness red/green LED indicators
- Wiring Terminals: Rear-mounted screw spring terminal blocks compatible with 0.3–2.0mm² insulated copper wire
- Mounting Structure: Retractable plastic panel clamping clips for tool-free installation into standard 48mm instrument panel cutouts
Installation Requirements
- Install into 48mm × 48mm square cutout on machine local control panel; panel thickness supported 1–6mm
- All sensor wiring must use shielded twisted pair cable, cable shield grounded at cabinet earth single-point only
- Maintain minimum 10cm distance between VC-920 power wiring and variable frequency drive power cables
- Rear wiring compartment requires minimum 110mm depth clearance behind mounting panel
- Adjust alarm threshold values after completing sensor wiring and verifying normal machine operating baseline vibration levels
Application Scenarios
- HVAC system air supply/exhaust fan bearing vibration monitoring
- Water treatment plant centrifugal pump safety supervision
- Small workshop air compressor and vacuum pump condition monitoring
- Auxiliary cooling water pump monitoring for power generation units
- Packaging machinery high-speed motor vibration protection
Operation & Maintenance Precautions
- Do not install in locations subject to direct water splash, high temperature radiant heat or heavy mechanical shock
- Calibrate vibration measurement accuracy every 12 months using certified vibration signal calibrator equipment
- Avoid over-tightening front panel adjustment potentiometers to prevent internal conductive track damage
- If sensor fault LED remains illuminated after wiring inspection, replace sensor cable first before replacing the VC-920 unit
- Clean front panel LED window monthly with dry microfiber cloth; chemical solvent cleaners will damage polycarbonate display cover
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