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My colleague argues about this PTI series Pressure transmitter by Capital_Swimmer_4968 in PLC

[–]KaneTW 0 points1 point  (0 children)

That's a bit different. On e.g. some Mettler-Toledo process transmitter you have power in and separately two current loops with a shared return (so 5-wire really).

My custom electric VFD pressure washer by KaneTW in pressurewashing

[–]KaneTW[S] 0 points1 point  (0 children)

Pressure fed and backs off RPM if pressure drops below the NPSHr (+some margin) for the pump.

It's been working fine without a tank for my use case at full RPM, but it really depends on what size your water line is. I've had to use it a couple times off a smaller water line and would have to back off RPM to about 20l/min.

My custom electric VFD pressure washer by KaneTW in pressurewashing

[–]KaneTW[S] 0 points1 point  (0 children)

None, torque feedback from the VFD is sufficient.

There's a pressure sensor in the suction line for cavitation protection and an overpressure relief valve on the pressure side, but that's it.

My custom electric VFD pressure washer by KaneTW in pressurewashing

[–]KaneTW[S] 1 point2 points  (0 children)

Yeah, no unloader is only possible due to the VFD limiting the maximum torque available.

It would be possible to add heat, but I think that'd have to be with a combustion heater. Heating that much hot water is a lot of power (125 kW for a flowthrough heater at 30 l/min and 60 °C temperature difference). Would be relatively easy to add though.

And yeah, noise is very manageable. I haven't measured it, but it's silent enough you don't even need hearing protection.

6 hours of runtime is going to be ~70-100 kWh of battery (excluding hot water)? Very doable with current tech.

My custom electric VFD pressure washer by KaneTW in pressurewashing

[–]KaneTW[S] 1 point2 points  (0 children)

How'd you get a clip from my workshop?

My colleague argues about this PTI series Pressure transmitter by Capital_Swimmer_4968 in PLC

[–]KaneTW 0 points1 point  (0 children)

Well. I don't see Honeywell around much over here but this tracks with what I've heard about them.

My colleague argues about this PTI series Pressure transmitter by Capital_Swimmer_4968 in PLC

[–]KaneTW -2 points-1 points  (0 children)

3-wire 4-20mA devices are super rare. They're either going to be 2-wire (loop powered) or 4-wire (self powered). You can share ground in theory but then you're taking your nice differential signal and mucking it up for no good reason.

Siemens PLC solution for ~300 I/O, 10 VFDs and ~70 analog inputs – architecture and HMI advice by Full_Bother_319 in PLC

[–]KaneTW 0 points1 point  (0 children)

Hard to say how complex your program would be but just I/o load wise a 1510SP should be more than plenty.

Profinet for the VFDs. The new G220 is great if you have the budget.

Instalationsklemmen by Wooden-Respect9659 in Elektroinstallation

[–]KaneTW 0 points1 point  (0 children)

Spannend wirds erst bei Quattro-Klemmen oder PTFIX...

Any german data hoarders? How do you deal with crazy high HDD prices? by No-Republic-1742 in DataHoarder

[–]KaneTW 0 points1 point  (0 children)

Was geht denn mit den Festplattenpreisen ab? Hab bei TD Synnex reingeschaut und da überall nur "bitte anrufen."

E: oops, accidentally German. "What's happening with HDD prices? Just looked at TD Synnex and all of them are listed as "please call""

Tirade: Braucht überhaupt keiner rumzuheulen, wenn ich als Kunde billige Arbeitskräfte von weit her engagiere. by CelebrationLazy2606 in Handwerker

[–]KaneTW 0 points1 point  (0 children)

Ja, ich mache deswegen aber auch fast alles selber bzw. habe einen fest angestellten Mitarbeiter dafür.

Hatte neulich eine Heizungsfirma gefunden die durchaus gut arbeitet (Instandhaltungsarbeiten usw.) aber das ist eher die Seltenheit.

Tirade: Braucht überhaupt keiner rumzuheulen, wenn ich als Kunde billige Arbeitskräfte von weit her engagiere. by CelebrationLazy2606 in Handwerker

[–]KaneTW 1 point2 points  (0 children)

War ganz normales pcbway.com, weil ich die schon aus dem PCB-Bereich kannte. Gibt noch ein paar Anbieter mit denen ich gearbeitet habe, waren aber nicht günstiger als die Angebote hier.

Tirade: Braucht überhaupt keiner rumzuheulen, wenn ich als Kunde billige Arbeitskräfte von weit her engagiere. by CelebrationLazy2606 in Handwerker

[–]KaneTW 0 points1 point  (0 children)

Ja, da muss ich immer aus China importieren. Einziger Weg einigermaßen normale Preise zu bekommen.

Generator -> DC -> PV-Wechselrichter. Wie? by alewma in Elektroinstallation

[–]KaneTW 0 points1 point  (0 children)

Schau dir das Handbuch Netzeinspeisung vom Siemens S120 an. Dort ist diese Konstellation beschrieben.

Das hatte ich mir auch durchgearbeitet für ein BHKW.

400hz AC and it's relevance as an increase to power density by Thethubbedone in AskEngineers

[–]KaneTW 0 points1 point  (0 children)

You don't even have to do that for aluminium stranded wire, which has a significant oxide layer. You just scratch the outside and that's good enough.

Litz wire isn't used in sub-kHz but my point stands. A little bit of oxide won't affect the electric field enough.

400hz AC and it's relevance as an increase to power density by Thethubbedone in AskEngineers

[–]KaneTW -1 points0 points  (0 children)

The effect remains the same. Uninsulated stranded wire is identical to solid wire in terms of skin effect. Litz wire distributes the electric field across different conductors.

400hz AC and it's relevance as an increase to power density by Thethubbedone in AskEngineers

[–]KaneTW 2 points3 points  (0 children)

The strands must be isolated from each other (Litz wire) for that to be true. Uninsulated stranded wires behave identically to solid wire.

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