Bad Electrical Panel. A Rare Speed Commander Appears! A Danish 4kW Motor Drive
I got hold of two electrical panels with a bad wiring job, worst documentation and completely out of code (racing fast for illegal). The did …
Tesla Coils, High Voltage and Electronics
I got hold of two electrical panels with a bad wiring job, worst documentation and completely out of code (racing fast for illegal). The did …
Teardown of a Eaton EX RT 5 kVA UPS model. The topology is a on-line double conversion with PFC (Power Factor Correction) system for a …
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, …
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, …
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, …
I scavenged a old 4 ton stone polisher machine for the best components and got off with a 3 kW AC server motor + drive, …
A teardown of a Kjellberg CUTi 31 Plasma Cutter with a power rating of 10 kVA. Made for cutting in 25-30 mm steel. Connecting voltage …
Three-phase string inverter, 20000Wac, 2 MPPT, 4 DC inputs for each MPPT, RS485 communication interface, IP65 (NEMA4x) environmental protection degree, integrated DC and AC disconnect …
Teardown of the Siemens Polyphos 30 X-ray systems control panel including computer, safety functions, HMI and high voltage inverter circuit.
In part 3 I test the setup with all 3 panels connected and look at the performance over the last 8 days. It all consists …
I finally got around to get the IH out of the box and repair it, here is part 1 of a series of videos on …
Here you can calculate the snubber capacitance that is needed to keep transient voltages below the maximum allowed value. Stray inductance is the inductance in the primary circuit of the inverter. If the stray inductance is not known, the two estimates can be used, high estimate for cable/wire primaries or long distances. Low estimate for copper busbar and short distances.
Switch between the input fields to automatically calculate the values.
Formulas used
Calculated snubber capacitance = Stray inductance * Peak current^2 / (maximum allowed transient voltage – DC bus voltage)^2
Snubber capacitance is given in Farad, stray indutance is given in Henry and voltage in Volt.
Estimated high inductance snubber capacitance = Peak current / 100
Estimated low inductance snubber capacitance = (Peak current / 100) * 0.5
Here is a video from taking apart 3 UPS units from Eaton PowerWare, these are 30 kVA units that was previously described in pictures and …