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The instrument is simple to operate, man-machine dialogue, menu prompts, measurement data can be locked and maintained at any time. VT dynamic balance instrument is compact and light weight. The keyboard and display are on the panel. Input and output jacks and various control switches are placed on the panel. VT700 balancing instrument can perform dynamic balance of the whole machine on various rotating machines. Equivalent to a movable balancing machine. It is designed to be portable and easy to carry, the entire instrument in a portable instrument box.
Technical parameters 1. General measurements:
Speed ​​measurement: 30 to 30,000 rpm
Ordinary vibration measurement: 0.1 to 5000 μm (peak to peak)
0.1～2000mm/s (effective value)
Vibration analysis: FFT spectrum analysis display mode: dot matrix graphics 64X240 dot matrix graphic LCD Chinese cuisine keyboard: eight keys 2. dynamic balance measurement:
Measured points: single point or single sided double point or double sided frequency operation speed: 100 ~ 30,000rpm
Co-frequency amplitude range: 0.1 to 5000 μm (peak to peak)
Vibrating intensity range: 0.1 to 2000 mm/s (effective value)
Phase accuracy: 0-360°±1°
Removal of unbalance rate: ≥95%
System connection and sensor installation The Hall speed sensor should be connected to the photoelectric input socket on the instrument panel (pay attention to the concave and convex position of the four-pin socket connector). When using Hall sensors, small magnetic steel should be placed on the pulley or shaft plane as a zero-phase mark. The Hall sensor is fixed by a magnetic watch seat and is facing the magnetic steel mark. The clearance is between 3~10mm. . After the power is turned on, when the Hall sensor is facing the magnetic steel, the indicator light on the Hall sensor is on, and the indicator light is off when leaving. When the rotor rotates at low frequency, the Hall sensor indicator light keeps flashing, and the photoelectric indicator on the panel is also flashing. There is a relatively stable speed display on the screen. This shows that the Hall sensor has a speed pulse output; otherwise, the distance between the Hall sensor and the magnet must be adjusted.
Placement of small magnets Note: 1. Magnetic steel has two sides. No circle mark faces outward, facing the hall sensor, otherwise no output will be made. 2. In order to increase the magnet suction, the magnet is best placed on the plane. 3. When the equipment rotor is running at a high speed, in order to prevent the magnetic steel from flying out due to centrifugal force, please use 502 glue to drip around the magnet. Please be careful.
Small magnets have a certain additional weight. When doing small rotor balancing test, or when the dynamic balance accuracy is very high, no additional weight is allowed. Please use the photoelectric speed sensor. Compared with photoelectric speed sensors, Hall sensor has a wide range of measurement speed, strong resistance to external environmental interference, and simple installation on site.
When using a photoelectric sensor, the photoelectric sign should be made on the shaft first, and the photoelectric sensor should be fixed on the sign above with a magnetic meter seat so that the photosensor of the photoelectric sensor is facing the photoelectric sign and the gap is between 5 and 20mm. Align the photoelectric sensor with the cursor on the rotating rotor. Observe the orange light emitting tube (action indicator) on the photoelectric sensor. The action indicator should keep flashing when receiving the reflected signal. Adjust the sensitivity knob on the photoelectric sensor so that the operation indicator light keeps flashing. At this time, there is a relatively stable speed display on the screen. This shows that the photoelectric sensor has a speed pulse output, otherwise it is necessary to adjust the distance of the photoelectric sensor or redo the photoelectric sign.
Photoelectric sensors used for the photoelectric sign is usually black / white mark, the shaft surface is wiped clean with black or black tape all black, and then use scissors to cut a piece of tin foil or self-adhesive reflective tape attached to it, the width of the reflective tape Should depend on the diameter of the shaft, the large diameter shaft should be wider.
The photoelectricity sign directly influences the measurement result, so the photoelectric sign should be clear black and white, the edge is neat, and the microbeads reflective tape has the best effect.
Phase angle definition:
The position of the small magnet is set as the zero degree of the phase angle. The phase angle is in the opposite direction to the rotation direction of the rotor. This must not be mistaken, otherwise the results of dynamic balance calculation become worse and worse.
â— Magnetoelectric speed sensor is used to pick up the absolute vibration of the equipment without external power supply. When using the magnetic suction cup fixed on the point to be measured (usually refers to the bearing on the bearing support), the sensor can be used in vertical and horizontal, two-way vibration speed sensor, its operating frequency band between 5Hz-1KHz.
â— The connecting cables are all equipped with connectors. The four-core cable is used to connect the Hall sensor to the host. Pay attention to the position of the positioning slot in the plug. Hold the rear end when inserting the cable. Hold the front aluminum ring when pulling out the cable. The three-core cable is the connection of the magnetoelectric speed sensor to the host.
â— The magnetic chuck is a special mounting sucker composed of ferronickel high-strength magnetic steel and specially designed magnetic circuit. The top M8 screw can be screwed into the screw hole of the bottom of the vibration absorber. It should be tightened tightly to prevent the detection signal from being unreal. This sucker can be easily installed on the device housing of ferromagnetic material. For non-ferromagnetic materials, the user needs to make another hole and drill wire to fix it. The depth of screwing in should be less than 6mm. Magnetic suction is very large and it is very easy to hold your fingers. The operation should be very safe.
3.2. Some explanations in the operation of the instrument 3.2.1, Operation instructions â— | Hold | Function of the key in the measurement process During the measurement process, the measured parameter may change, causing the value of the parameter displayed on the LCD to flicker. For this purpose, you can press | hold| to fix the parameter at a certain time for display or selection. At this time, the ** mark appears in the upper right corner of the LCD screen. If you press | , If you press | keep| again, the ** mark disappears and the LCD screen number will continue to flash.
In the dynamic balance measurement, if you are satisfied with the measured amplitude value, you can press | hold | key to keep the data on the display, (if you press again | keep | key to enter the measurement state again), then press | The key data is stored by the computer and prompts you for the next step.
◠Speed ​​effective value (RMS) and shift peak-to-peak measurement switching In the measurement state, press |+| to measure the cycle between the effective rms value (RMS) and the shift peak-to-peak value (Vp-p). Press once |+| to switch once. In the dynamic balance measurement, displacement measurement is generally selected and the unit is um.
â— Magnification selection In the measurement state, the xN value displayed in the upper left corner of the LCD screen is the magnification. Press and to reselect the magnification. The magnification of the instrument can be selected in four steps: x0.1, x1, x10 and x100.
◠Preset speed In dynamic balance measurement, when the actual speed ≥ preset speed, the instrument enters the hold state, which is equivalent to pressing the |Keep|.
â— Channel switching In the vibration measurement, the switching of the A channel and the B channel is realized by the ? key. In the dynamic balance measurement, the single plane measurement is fixed in the A channel, and the channel switching of the dual plane measurement is performed automatically.
â— Overflow indication In the measurement process, if there are 999 digits on the display, it means that the measurement overflows. In this case, the range should be switched.
â— Sensor selection If you need to use the eddy current displacement sensor during the measurement, after the power is turned on, when the VT800 balancing instrument is displayed on the display, press | hold | key. When the sensor selection appears on the display, select the displacement sensor. The default value of the instrument is the speed sensor.
VT series dynamic balance measuring instrument is aimed at the highest technology at home and abroad, adopting large-scale integrated circuit and single chip microcomputer technology. The instrument is versatile and can be used both as a tachometer and as a vibration tester. Both time domain analysis and frequency domain analysis can be performed. In particular, it has all the functions for measuring dynamic balance.