I’ve been having some troubles with reading our systems current with the Bluerobotics PSM R2.
The voltage seems to be accurate, but our displayed current is around -12A, when the ROV is just idle. We have modded the design with the cables a bit, but I thought this wouldn’t influence the actual measurements.
I thought this would be due to the fact that there’s way more cable attached to the PSM or that the GND wires are spereate from the PSM. With the original PSM, the GND wire is tied to the back of the PSM with a heatshrink tube.
I tried to play around with the voltage offset, but that didn’t solve the issue fully.
We attach two batteries to the PSM, we always make sure both are fully charged so they should be about in balance.
The GND from both batteries are attached to the same GND Rail in our Electronics Enclosure.
I have to say that we bussed the GND together before screwing them onto the Rail, so this might be something!
Hi @sietse -
I believe the ground connection needs to be made to the PSM board in order to measure current accurately. If not, perhaps the heat from soldering the additional positive wire onto the PSM affected the measurement. You could try adjusting your calibration via this extension
, found in the extensions manager in BlueOS (with internet connection to the vehicle active of course.)
@tony-white I’ve tried the Power Switch extension and it seems to work! Allthough it gave a note about theat the offset was a bit out of what a normal ‘BlueBoat’ should be. I guess I could ignore this notification?
@SubseaLED The current isn’t always -12A, when I use the thruster, the current will fluctuate!
Hi @sietse -
Glad that resolved things! I would guess something on the PSM is damaged but the custom parameters are working to compensate for it. The message of the result being outside of BlueBoat expectations is normal!
