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Posted: 2021-11-2512:36 AM. Last Modified: 2021-11-2512:39 AM
SHDxxxx and now also STR300 measures suffer from value freezing
With SHD's, this is a known issue. FW upgrade on week 9 and 10 (depending of model) this year "might have" solved this. There is at least one hospital site, where newer FW has stopped from working. Something very similar occurred with STR300 models: value freezing. This is more rare issue.
What comes to SHD's, the reason behind this mightbe a lack of shielding. Plastic tube and unshielded wiring from main print board to RH sensing element and its obviously tiny print board at the tip. This construction looks like an antenna in metal duct, where fan motors generate electric noise. This is fatal to sensitive I2C communication.
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Posted: 2021-12-0103:07 AM
Hello JarmoE,
I have forwarded notice of this issue now with STR300 models to the Issue Resolution Specialist and Customer Satisfaction &Quality manager, who with the line of business are currently in discussions with the manufacturer regarding this issue with the SHDs. I have included a link to your post. I have asked for confirmation this is considered due to the same issue with communication between the circuit board and the sensor being broken due to EMC interference.
Can I suggest you raise this with your local Schneider Electric contact, who will be able to contact the line of business directly.