Effectively Troubleshooting Pulse Loss Faults in T-Series Closed-Loop Drives Using Motion Studio Software

This document is compiled based on practical project troubleshooting experience. It addresses pulse loss issues caused by abnormal encoder disc conditions during the operation of T-Series closed-loop drives, providing a systematic troubleshooting process and solutions using the Motion Studio software tool. The detection process requires only a T-Series closed-loop drive, essential closed-loop motor components, and a personal computer, with no complex equipment needed, making it highly convenient for DIY users.

1. Situation Analysis

• Applicable Products: CL42T-V41, CL57T-V41, CL86T-V41, CL57TE, CL57T, CL86T, and related combinations.
• Problem Overview: When the above closed-loop drives operate with closed-loop motors, abnormal step loss or direct encoder deviation alarms may occur. In such cases, it is necessary to identify which component is faulty.

2. Test Preparation

Motion Studio software, closed-loop drive, closed-loop motor, and a compatible switching power supply.

3. Standardized Test Procedure

Step 1: Set the drive to open-loop mode (adjust via the SW6 DIP switch).

Step 2: Run Motion Studio software and follow the steps below to establish the connection:

Step 3: Click "Monitor" on the left panel, then select "Scope." Run the motor to plot a comparison curve of the position feedback value and the command position value.

• Under normal conditions, the two curves should completely overlap.
• If the curves do not overlap (as shown in Figure 2), it indicates an abnormality in the motor or encoder.

Step 4: Manual Test

• Power the ENA+ and ENA- ports of the drive with a 24VDC power supply to disable the motor, while keeping the encoder cable connected.
• Manually rotate the motor shaft. The position feedback value in Motion Studio should change synchronously (as shown in the figure). This helps determine whether there is any encoder signal loss.
• If the encoder waveform is normal, without interruptions or abnormal fluctuations, the encoder can be confirmed as intact.

4. Test Result Feedback

If your closed-loop kit experiences such issues within the warranty period, you can directly perform this test and send the test result images or videos to us for further assistance.

Updated on: 30/01/2026