View source for Target Troubleshooting Procedures

<bold>Below is a list of common issues and known solutions with the target.</bold>

<header>Cryogenics Panel</header>
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<b>LHe Batch Fill valve readback jumps to a very large value, magnet dewar no longer fills.</b>
In this situation the encoder will read a large (>10) value and will reset so this new value will be considered closed on the supply valve. A common indication that this has occurred is if the LHe level in the magnet dewar does not refill automatically. The dewar will not fill because the maximum encoder position on the batch fill loop is less than the new "zeroed" value. 
Temporary fix: This can be fixed temporarily by disabling the LHe batch fill and manually opening the valve, the new "open" position on the valve will be 2-3 turns greater than what it considers the new "zero" position. When the magnet dewar is filled the valve must manually be closed by setting the encoder position to zero (or any value less than what it considers the new "zero"). To fix this offset an access must be made to reset the encoder position.