strange DAC behavior in h1tcscs
DAC is triggering overflow on channels that are well below the limit (26000 or so).
Also, h1tcscs DAC values are reading about 5% less than the inputs, but the IOP readings for the same channel are almost corrected back to the original value.
Camilla writes:
Hi Erik,
Thanks for helping with this problem. It was also mentioned in Jeff Kissel's alog: 60550
We were looking at the overflowing H1:FEC-26_DAC_OUTPUT_0_4. And comparing this to the not overflowing H1:FEC-23_DAC_OUTPUT_1_4. Different to the actual filter output H1:TCS-ITMX_CO2_CHILLER_OUT_GAIN_OUTPUT.
I saw that DAC0 channel 4 is the TMX_CO2_CHILLER_OUT by looking at the simulink of h1tcscs. Strangely channel 14 seems empty there.
Camilla
requested set point (C) | CHILLER_OUT_GAIN | DAC0 chan4 | overflow |
---|---|---|---|
20.2 | 27937 | 26470 | yes |
20.1 | 27743 | 26285 | yes |
20 | 27548 | 26101 | yes |
19.5 | 26575 | 25179 | yes |
19.1 | 25797 | 24442 | no |
19.2 | 25992 | 24627 | yes |