Vedran Devcic
  • Male
  • Primorsko goranska županija
  • Croatia
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Martin Jackson replied to Vedran Devcic's discussion Controling 4 ROV thrusters (vectored configuration) with arduino and joystick in the group ArduBoat User Group
"Hi Vedran, The basic control code runs something like this ... ROV Control (4 thrust vectored) //Input:  //Joystick Controls, Fwd/Aft, Port/Stbd and Rotate L/R // Convention +ve fwd and stbd // Need to arrange (or adjust demands) to ensure…"
Jan 16, 2016

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Thomas J Coyle III replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"@Vedran, Having the surrounding water cool the surface of the Al WTC to which the heat sink of the down converting regulator is attached is a good idea. Regards, Tom C AVD"
Jan 15, 2016
Vedran Devcic replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"I have thinked about it.  We plan to make our WTC out of Aluminium tube so i was thinking about mounting a buck heatsink to the WTC, that way i would have large area to disipate produced heat, but i havent gone in details about it jet. What do…"
Jan 15, 2016

Admin
Thomas J Coyle III replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"@Vedran, Have you given any thought to the power conversion in the ROV? If you assume that you are using all of the available 3300 watts, your bucking regulator, assuming it is a switcher, even if it 90% efficient, which is probably on the high…"
Jan 15, 2016
Vedran Devcic replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"Im aware 11amps isnt enough but im still thinkig to go bigger or to limit them a little bit by software. Once more thank you very much for your input (time) its much appriciated."
Jan 15, 2016

Admin
Thomas J Coyle III replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"@Vedran, Power (P) = Current (I) X Voltage (V) Power = 300 vdc X 11 amps = 3300 watts Current (I) = 3300 watts/ 16 vdc = 206 amps at the ROV The above assumes no power loss in the cable and no conversion losses from 300 vdc to 16 vdc. However,…"
Jan 15, 2016
Vedran Devcic replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"Regarding cable. I found cable that is rated for 450v dc and is designed to be permanently submerged to 100m. And price is 1.32 eur for meter. (+ tax 20%) that seems pretty fair to…"
Jan 15, 2016
Vedran Devcic replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"Biggest problem as i see it is that t200 thrusters use really allot of current. Theirs max rated consumption is 25amps but ESCs burst or max consumption is 35amps in water as per documentation. In scenario when you are trying to lift something…"
Jan 15, 2016

Admin
Thomas J Coyle III replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"@Vedran, You need to calculate the resistance per meter for each size of the power cable and make a decision based on the maximum length of the cable. But if you are going to convert back to 16 vdc, then the copper losses in the power cable become…"
Jan 15, 2016
Vedran Devcic replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"Yes that is the idea. Power generator 220v ac -> Ps 220ac to 300v Dc@11amps -> rov onboard 300v dc to 16v dc Thats almost the same as some of commercial opsevational class ROVs. We know that is allot of hardware but we are aiming for 5+…"
Jan 15, 2016

Admin
Thomas J Coyle III replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"@Vedran, Yes, that will work as the commercial ROVs use the higher voltage. Will you use an AC generator on the boat to provide the mains power? Regards, Tom C AVD"
Jan 15, 2016
Vedran Devcic replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"Hi Tom! Once again thank for fast and detailed reply! I already saw this solution on your post, but this just adds complicity to already complicated subject, we would rather go with off the shell power supply and be done with it... Can you maybe…"
Jan 15, 2016

Admin
Thomas J Coyle III replied to Vedran Devcic's discussion Powering ROV from topside in the group ArduBoat User Group
"@Vedran, Patrick Rowe suggested the following method for powering a ROV from the surface: Good success with very long power delivery using Variable frequency 3 phase AC with active feedback. A small onboard battery for surge loads that is…"
Jan 14, 2016
Vedran Devcic added a discussion to the group ArduBoat User Group
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Powering ROV from topside

Hi everyone.Whats yout thoughts on most efficent way to power ROV from topside.Max Demands are pretty high current wise, 6x25amps@16v for thrusters only+lights+camera+control+some spare for toolings.We are thinking about 300 V dc@15amps that we could sent thru 6mm2 cable, but that seems allot to play with...p.s. teather will be around 120m long.See More
Jan 14, 2016
Vedran Devcic replied to Vedran Devcic's discussion Controling 4 ROV thrusters (vectored configuration) with arduino and joystick in the group ArduBoat User Group
"Hi Martin! Of course, that would be much appreciated!"
Jan 13, 2016
Martin Jackson replied to Vedran Devcic's discussion Controling 4 ROV thrusters (vectored configuration) with arduino and joystick in the group ArduBoat User Group
"Hi Tom Yes, for sure, It will take me a day or two to dig out the details but will post it when I can. I am interested to see the progress you guys are making. Best regards Martin"
Jan 13, 2016

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Please tell us a bit about your UAV interest
Planning to build ROV.
Hometown:
Kraljevica

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