[dsg-svt] [New Logentry] SVT Coolant Leak Sensor for Hardware Interlocks

[beng at jlab.org]

Logentry Text:
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During the access to change the chiller coolant Pablo and I went to test the coolant leak sensor. Previously the cRIO was only reading ~3 mV when there was a leak detected, which was very close to the noise of the ADC input causing false interlocks so it was left disabled on the cRIO.

We moved the output on the leak sensor controller (Panasonic SQ4-C11) from AUX1 to Y1, this properly output a 10+ V signal to the cRIO when a leak is detected. However, we observed spikes in the raw ADC input to the cRIO (above the threshold of 9.5 V) causing the cRIO to generate an interlock. Since the leak sensor controller itself will latch on a fault and requires a manual reset to remove the interlock, which it wasn't doing on the voltage spikes it appears the sensor itself is okay.

The interlock was left disabled on the cRIO. We'll try and debug later with an oscilloscope to see if we can isolate where the voltage is coming from.

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