These are examples of previously seen problems
Sudden and unexpected current draw seen on a feedthrough¶
As of 09/23/15 the known current draw on the feedthroughs in micro-Amps are (This is at +230 V / - 110 V nominal wire bias):
|Positive Bias Current||n/a||0||0||312||2||0||0||0||0||20|
|Negative Bias Current||0||0||0||0||0||0||181||320||98||1|
If any of these channels were to change their state by greater than 6 microAmps the channel would go into alarm. This will not necessarily cause the channel to turn off (depending on the amount of increase in the current draw) but should give an alarm.
The alarm will appear with a given channel for the TPC bias current with red box as shown below
If this occurs, follow the instructions on the TPC guide and contact a TPC expert