液壓萬能試驗機:拉力試驗機位移出現故障后的維修步驟：

　　Hydraulic universal testing machine: Maintenance steps after displacement failure of tension testing machine:

　　1、首先對位移傳感器進行檢查：

　　1. First, the displacement sensor is checked.

　　因為拉力試驗機系統是一個閉環系統，要想知道是哪個部分出現了問題，就一定要切斷系統中的回路，使其成為一個開環的系統。從而可以判斷試驗機的傳感器信號是不是正常。這個時候也要斷開位移傳感器的反饋信號，使其成為開環。此時工作站發出一個控制動作器移動的信號，對傳感器的反饋值進行測量，在幾次重復之后，傳感器的反饋數據值可以組成一條直線，這個直線是線性變化的，從而就可以知道傳感器是不是有問題了。

　　Because the tension testing machine system is a closed-loop system, in order to know which part of the system has problems, it is necessary to cut off the loop of the system and make it an open-loop system. So we can judge whether the sensor signal of the test machine is normal or not. At this time, the feedback signal of the displacement sensor should be disconnected to make it open-loop. At this time, the workstation sends out a signal to control the movement of the actuator, and measures the feedback value of the sensor. After several repetitions, the feedback data value of the sensor can form a straight line, which changes linearly, so that we can know whether the sensor is in trouble.

　　2、其次就是對拉力試驗機的放大器單元的檢查：

　　2. Next is the check of the amplifier unit of the tension testing machine.

　　在已經排除了位移傳感器的問題之后，因為拉力試驗機的系統是一個閉環系統，放大器單元的正常與否是一定要進行檢查的，方法就是斷開放大器單元的輸出信號。將輸出接線拆除，在放大器單元加上一個直流輸入信號，然后測量擺錘沖擊試驗機放大器單元的輸出情況，在重復試驗幾次之后，得到一個放大器單元輸出信號的線性變化趨勢數據，這樣就可以知道放大器單元是不是有問題了。

　　After eliminating the problem of displacement sensor, because the system of tension testing machine is a closed-loop system, whether the amplifier unit is normal or not must be checked by disconnecting the output signal of the amplifier unit. Remove the output wiring, add a DC input signal to the amplifier unit, and then measure the output of the amplifier unit of the pendulum impact tester. After repeated tests, the linear trend data of the output signal of an amplifier unit are obtained, so that we can know whether the amplifier unit is in trouble.

　　3、最后就是檢查拉力試驗機的系統設定是否正常：

　　3. Finally, check whether the system settings of the tension testing machine are normal:

　　工作站當中的動作器的行程正常情況下應該是±50mm，如果與這個數字不符，那么就是系統設定的問題，就需要重新的設定系統。要是工作站的顯示板上面的顯示值依舊不正確，那么就可以判定只有重新的標定位移系統，才可以解決這一類的問題。

　　Actuator travel in the workstation should normally be (+50mm). If it does not match this number, then it is the problem of system settings, and the system needs to be re-set. If the display value on the display board of the workstation is still incorrect, then it can be determined that only the re-positioning and moving system can solve this kind of problem.http://www.omtstitch.com