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- Unplug and plug the communication cables of both outlet flow controllers → Problem was not resolved by this step.
- Restarted the HMI screen (in the hall) following How to fix the QT-HMI if its screen got frozen → Problem was not resolved by this step.
- Restarted the QT PLC cabinet, following these steps on How to restart the QT PLC → The outlet flows FCA and FCB were still showing 71.11slm
- Switched both Liquefiers to the Run + Manual + Liqiefy mode and monitor the FMR
- Switched LQ-B (only) to run on Run + Manual + Liqiefy mode → changed the outlet flow to 2,5,10,20,30,40slm and noticed that it is working properly (also confirming the FMR value also consistently changing)→ Noticed that the LQ-B is working fine only when that LQ is running.
- Switched LQ-A also to the Run + Manual + Liqiefy mode while LQ-B also running → Noticed that both FCA and FCB immediately started showing 71.11slm
- Stopped both LQs and Switched LQ-A (only) to the Run + Manual + Liqiefy mode → Noticed that the outflow FCA was 2slm (as same as the set value).
- Switched LQ-B also to the Run + Manual + Liqiefy mode while LQ-A also running → Noticed that the problem with FCA and FCB was fixed.
Solution #3:
If a high outflow occurs during the Magnet Fill, and you struggle to keep the liquefiers in Auto+Liquefy mode to regulate the outflow while performing a pre-cool on the transfer line, you could try switching to Manual+Idle mode. Below is a snapshot illustrating how the outflow can be adjusted in manual mode during pre-cooling. You should try to minimize the outflow to reduce LHe loss from the Liquefiers. However, if the transfer line has already been cooled for a significant period, the best way to avoid a large outflow is to proceed with filling the magnet.
