Electronic tensile testing machineIt is the core equipment for conducting mechanical property tests such as stretching, peeling, and compression in modern materials laboratories. Its long-term stable operation and accurate and reliable data are directly related to quality control, product development, and standard compliance judgment. This article aims to build a systematic troubleshooting framework to help operators and maintenance engineers quickly identify the root causes of common problems, implement effective maintenance, and ensure that equipment is always in effective working condition.

Building a systematic fault diagnosis mindset

The effective way to deal with equipment failures is to followFrom outside to inside, from simple to complexThe system diagnostic path. This can not only quickly restore the device, but also avoid secondary damage caused by improper operation. The complete diagnostic process should cover the entire chain from peripheral environment, power connection, mechanical transmission, core sensors, and finally to software and control.

Common fault classification, diagnosis, and solutions

Following the above diagnostic logic, common problems can be classified into the following categories:

Category *: Power and Basic Control System Malfunctions
This type of problem usually manifests as the device being unable to start or some functions malfunctioning.

• Fault phenomenonThe power indicator light is not on; Pressing the "up" or "down" button will result in no action of the device.

• Diagnosis and Solution：

1. Check the power supply linkConfirm that the main power switch and equipment power plug have reliable contact and stable power supply voltage.

2. Check the safety deviceOpen the electrical box of the device and check if the fuse on the main circuit board is blown.

3. Check the safety limitConfirm whether the equipment crossbeam has touched the mechanical limit, causing the motor to be forcibly locked.

4. Check the emergency switchConfirm whether the emergency stop button of the device is in the raised (reset) state.

Category 2: Mechanical Transmission and Abnormal Motion
This type of malfunction directly affects the stability of testing speed and the accuracy of displacement.

• Fault phenomenonAbnormal vibrations and noise are generated during device operation; The running speed is unstable or unable to reach the set value.

• Diagnosis and Solution：

1. Check the level and fixation of the equipmentUse a level to check if the equipment is placed steadily, if the four feet are evenly stressed, and tighten all foot screws and pedestal connection screws.

2. Check the transmission systemCheck whether the ball screw and guide rail are well lubricated, whether there are foreign objects stuck or obvious wear. For models with synchronous belt drive, check whether the belt is loose or damaged.

3. Check the motor and driverListen to whether the sound of the motor running is uniform and whether there are any alarm codes on the driver.

Category 3: Abnormal measurement system data
This is the core issue that affects the accuracy of test data, usually related to sensors and signal transmission.

• Fault phenomenonThe force value is displayed as zero, with a huge jump or a serious deviation from expectations; The elongation (displacement) display is abnormal or cannot be reset to zero.

• Diagnosis and Solution：

1. Check the sensor connection：Focus on inspecting the signal line connectors of the force sensor (load cell) and extensometer ("two-point extender")Whether it is loose, detached, or has poor contact.

2. Perform sensor calibrationAttempt to perform 'zero calibration' on force and displacement sensors in the device software. If calibration fails or the data remains abnormal, it may be due to a malfunction of the sensor itself.

3. Identify external interferenceCheck if there are high-power devices starting simultaneously in the laboratory causing power grid fluctuations, or if signal lines are arranged in parallel with power lines causing electromagnetic interference.

4. Check software settingsConfirm that the settings related to "sensor coefficients", "calibration parameters", and "measurement methods" in the testing software are correct and error free.

Category 4: Software and Communication Malfunctions
With the intelligence of devices, software problems are becoming increasingly common.

• Fault phenomenonThe computer cannot communicate with the testing machine host; Software startup error or stuck; The test curve is interrupted abnormally.

• Diagnosis and Solution：

1. Check the communication linkConfirm that the data cable (usually USB or serial cable) connecting the computer to the host is securely connected. You can try replacing a computer USB port or data cable.

2. Restart and ReinstallTurn off the computer and host power, wait for one minute, and then restart. If the software crashes, you can try restarting the software or reinstalling the driver.

3. Troubleshooting system conflictsClose other background programs on the computer that may conflict with the testing software, especially software that occupies serial ports or a large amount of memory.

4. Check software licenses and updatesConfirm that the software license is valid and check if the device manufacturer has available software patches or firmware updates.

Establish preventive maintenance habits

Regular preventive maintenance can significantly reduce the failure rate:

• Daily inspectionBefore starting up, check the appearance and wiring connections of the equipment, perform simple no-load operation and sensor zeroing operation.

• regular maintenanceAccording to the frequency of use, clean the equipment dust every 3-6 months and add special lubricating grease to moving parts such as ball screws and guide rails.

• Annual calibration：Must be commissioned annuallyCNASQualified third-party metrology institutions conduct comprehensive force, velocity, and displacement calibration of equipmentTo ensure the accuracy and traceability of test data.

Advanced Troubleshooting Q&A

Q: During the film stretching test, the data repeatability suddenly decreased, but the equipment self-test reported an error. What could be the possible reason?

Answer: After ruling out hardware issues with the device, the focus should be on examining itTesting conditions and the sample itselfFirstly, check whether the laboratory temperature and humidity meet the standard requirements. Fluctuations in temperature and humidity can cause changes in the performance of many polymer materials, such as plastic films. Secondly, check whether the clamping surface of the fixture is worn, has oil stains or residues, which can cause the sample to slip or stress concentration. Finally, confirm whether the cutting of the sample is standardized and whether there is any damage to the edges. It is recommended to conduct a test using standard reference samples to isolate material variables and confirm the root cause of the problem.

Q: The equipment crossbeam may occasionally experience sudden jamming or shaking during operation, and then recover, sometimes good and sometimes bad. How to troubleshoot this?

Answer: This type of intermittent fault is usually associated withConnection or electrical contactof Firstly, check the connectors of all motors, encoders, and sensors for any virtual soldering or looseness. Secondly, check if the grounding of the equipment is good, as poor grounding may introduce interference. Finally, this issue may also be caused by unstable performance of an electronic component on the driver or motion control card, which requires deep testing by the device manufacturer's technical support personnel.

Q: The software can collect force and displacement signals, but the generated stress-strain curve is significantly distorted. How to handle it?

Answer: Curve distortion usually points toProblems in the data collection processStep *, check if the data collection frequency (sampling rate) setting in the software is appropriate, as a too low sampling rate will result in loss of details. Step 2, check the settings in the softwareIs the original size (thickness, width) of the sample correctIncorrect geometric parameters can lead to errors in stress and strain calculations. Step three, attempt to recalibrate the linear relationship between "force voltage" and "displacement voltage" in the software.

Q: What information should be prepared before contacting manufacturer support for complex faults that cannot be resolved on their own?

Answer: Efficient technical support relies on accurate information transmission. Please be sure to prepare:

1. The specific model and factory number of the equipment.

2. Clear description of the fault phenomenon (when, under what operation, and what phenomenon occurred).

3. Take photos of the equipment status during malfunctions, screenshots of software errors, or abnormal curve graphs.

4. All the troubleshooting steps and results you have tried.
   These pieces of information can help engineers make remote predictions, greatly reducing the time required to solve problems. A well-designed and well maintained tensile testing machine can have a stable service life of several decades. The key is to establish a systematic maintenance concept, rather than just "putting out the fire" when there is a malfunction.

DisclaimersThe content of this article aims to provide universal technical ideas and suggestions for troubleshooting electronic tensile testing machines, for reference only, and does not constitute any operational commitment. Specific equipment maintenance and repair operations must strictly follow the technical manuals and safety specifications provided by the equipment manufacturer. For complex or core component related failures, it is strongly recommended to contact the equipment manufacturer or professional technicians for handling to ensure safety and equipment integrity.