I. Initial Screening of Hardware Links
Trigger Signal Timing Comparison: Use an oscilloscope to measure the signal at the end of each slave channel's trigger line sequentially. Compare this to the arrival time of the master channel's trigger signal. Channels with significantly larger signal delays are suspected abnormal channels.
Terminal Insertion/Removal Verification: Insert and remove the external trigger input terminals of each slave channel one by one, observing the change in synchronization deviation. Channels where synchronization returns to normal after insertion/removal are abnormal channels caused by poor contact.
II. Group Isolation and Troubleshooting
Divide all slave channels into groups of 2-3. Connect each group to the synchronization link in batches and test the synchronization deviation of each group to quickly locate the group containing the abnormal channel. Then, verify each channel individually within that group to precisely narrow down the troubleshooting scope.
Reset the delay parameters of all channels to 0. Fine-tune the delay of each channel individually, recording the change in synchronization deviation after each adjustment. Channels with a sudden change in deviation value are abnormal channels.
III. Visual Waveform Identification
Using the multi-channel acquisition function of an oscilloscope, simultaneously input the output signals of the main channel and all slave channels. Display the rising edge position of the waveforms for all channels at once. The channel whose waveform deviates significantly from the main channel's time reference is the abnormal channel causing the synchronization deviation.
Read the phase time difference of each channel. The channel with a deviation value much greater than that of any other individual channel is the source channel of the synchronization deviation.
IV. Final Confirmation and Verification
Connect the suspected abnormal channel to the synchronization system alone, disconnecting all other channels. Test the synchronization deviation between this channel and the main channel individually. If the deviation value far exceeds the acceptable threshold of ≤0.01s, the channel is 100% confirmed to be the abnormal channel.
This judgment method is perfectly suited for hot runner industrial field operation and maintenance scenarios. It is highly efficient and accurate, and can quickly identify the abnormal channel causing the synchronization deviation.
