[Dsg-halla_ecal] ECAL heater controls update

[Marc Mcmullen]

Hi Don,

Here is what I have found so far.

The power supplies on the following channels need to be replaced:

5, 10, 11, 12, 13, 14, 15, 32, and 42

I confirmed this on 5, 10, 11, and 12. The others behave similarly, and they are too difficult to get to the connectors to confirm.  The issue seems to be the dimmer circuit. The ones I checked looked like they turn on but we cannot adjust the current output from the minimum. I also check that the controls were trying to adjust the supplies.

Before we swap out the supplies we need to test each new one using channel 1. We can test them right on top of the power supply rack to confirm they work.

During testing I confirmed that the thermocouples on channels 11 and 16 are swapped. I verified that it is not at the controls rack TC terminal blocks.

These are all the major issues found.

Minor issues: I have a couple of current readbacks  that are swapped (23 and 24). The current readback on channel 30 is negative. These final two issues are not major and have nothing to do with heater control or safety, and I can fix them in software.

Other than that I was able to ramp up all the other channels to ~30 C.

Currently, the system is on. I have all the relays turned off in software so they will not provide power to the heaters. I will start testing the PID control tomorrow.

Let me know when you have the supplies ready for testing on channel 1. I can test them before you install them.


Marc


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