Maintenance Work
Voltage and current level recording
Using the MEMORY HiCORDER as a RMS recorder enables measurement of voltage and current levels.
This greatly simplifies recording of power line fluctuations over a long period of time.
Trigger activation for detection of momentary power failures.
Plant equipment monitoring
In plants, MEMORY HiCORDERs are used to measure and record the operation of solenoid and control valves.
Since X-Y plots can be simultaneously created for four channels, the relationship between flow and valve lift can also be observed. |
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Method to identifying leak current emitting equipment
The MEMORY HiCORDER can be used to identify from which of several machine tools that leak current originates.
The leak current is measured by applying clamp-on- probes to the power supply line and all the machines to be inspected.
The signals indicating the operation conditions and obtained from each of the machines are input as logic input. Logic and leak current are measured over a long time. Analyzing the machine operation conditions and the changes in leak current can help identify the faulty machines. |
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Measuring transport comfort on devices such as elevators
The minute variations in the acceleration accompanying the movement of an elevator car affect how comfortable the ride feels to people in the elevator. By recording these minute changes in acceleration, ride comfort can be quantified.
A strain gage is used to convert the acceleration to a voltage that the MEMORY HiCORDER can record.
The acceleration involved in the movement of the elevator or other transport device can be recorded as acceleration with fast changes, which affect the comfort of the ride, and acceleration with suitable slow changes for comparison. At the same time, the motor or engine
control signal, drive voltage and current can also be recorded and used for reference in connection with inspection and maintenance of the device. |
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Inspection of rotating machinery
Since substantial economic losses are entailed when large rotating machinery, such as generators and motors, stands still, it is desirable to always have a good understanding of the operating conditions of the machinery. The oscillation method, which utilizes the phenomenon that vibrations emitted from machinery increase together with advancing deterioration, can be used for this purpose.
Measurements should be performed periodically so that the waveform at the time of the installation of the machine can be compared with the current waveform to observe changes taking place in the course of time.
Acceleration sensors are attached to the rotating machinery; the oscillation is detected and input to the MEMORY HiCORDER where FFT analysis takes place.
This allows unbalance, misalignment, gear irregularities, bearing and oil irregularities, etc. to be estimated. |
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