Hey folks,
I have been working on a system that is using about 20 one-wire temperature sensors through a Teensy 3.1. The Teesny and temp sensors are powered (5VDC) by a buck converter from the 24VDC supply on the PLC. Things work great with reading temperatures and whatnot until we turn on the VFDs for the water pumps on the system. When we turn on the VFDs, the sensors give garbage readings. The VFDs have their own power supply, but they seem to be the cause of the bad sensor readings. Any of you folks have experience with this? Is it the switching harmonics that are messing with sensors? Is there a way to mitigate that? We can't more forward with our proof-of-concept prototype testing until we figure this out so any help will be greatly appreciated.
Cheers,
~Phuz
I have been working on a system that is using about 20 one-wire temperature sensors through a Teensy 3.1. The Teesny and temp sensors are powered (5VDC) by a buck converter from the 24VDC supply on the PLC. Things work great with reading temperatures and whatnot until we turn on the VFDs for the water pumps on the system. When we turn on the VFDs, the sensors give garbage readings. The VFDs have their own power supply, but they seem to be the cause of the bad sensor readings. Any of you folks have experience with this? Is it the switching harmonics that are messing with sensors? Is there a way to mitigate that? We can't more forward with our proof-of-concept prototype testing until we figure this out so any help will be greatly appreciated.
Cheers,
~Phuz