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Variable frequency drive, a three-phase AC output motor controller. Questions about vacuum fluorescent displays should not receive this tag.

2
votes
VFDs are used to drive three-phase motors. Swapping two phases will have the effect of reversing the phase sequence. Figure 1. Effect of swapping two phases.
answered Aug 24 '16 by Transistor
1
vote
This is very unlikely to work well. Figure 1. PWM approximation to a sine wave. Source: VFDS. VFDs use PWM from their internal DC bus which in turn is full-wave mains and will be close to \$ \sqrt …
answered Feb 28 '18 by Transistor
2
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It may be irrelevant. Many VFDs use slip compensation. Slip Compensation Slip compensation is actually a sophisticated version of the open loop concept. The slip compensation method of speed …
answered Sep 27 '17 by Transistor
1
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Figure 1. Extract from the FT330 sensor. That sensor is capable of sinking 25 mA so there should be no problem with noise. Your problem is likely with the installation or choice of power supply or …
answered Sep 1 '16 by Transistor
3
votes
Your motor is 15 HP x 750 W/HP = 11.25 kW. The FR-F740 should handle that OK but you need to set the motor type and power. Figure 1. Page 153 of the FR user manual. Start around page 153 of the m …
answered Oct 12 '17 by Transistor
5
votes
If a motor has two poles it will rotate once per mains cycle. At 50 Hz this will be 50 x 60 = 3000 RPM. If a motor has four poles it will rotate half a revolution per mains cycle. At 50 Hz this will …
answered Dec 26 '17 by Transistor
3
votes
filter. Red = desired speed. Blue = PWM. Green = actual output from filter. Source: Piano with RTOS. Depending on the VFD this might be adequate if you are able to scale up the maximum frequency. For … example: Our application requires motor speed adjustable from 0 to 50 Hz. Our PWM filtered signal is 5 V at 100% pulse width. Set the VFD max motor frequency to 100 Hz. Now at 5 V in the VFD will …
answered May 22 '16 by Transistor
3
votes
Figure 1. Variable Frequency Drive outline schematic thanks to Stephen Collings. Yes, the VFD will continue to commutate during deceleration - this time with the frequency lower than that of the … controlled to modulate the degree of dumping as required. Figure 2. A typical IGBT VFD module. Source: Fuji Electric. The module shown in Figure 2 includes a three-phase rectifier, the P-N output …
answered Aug 4 by Transistor
1
vote
Page 170 of the Goodrive 200 user manual says The 16 step speeds can be set by the combination of digital state of four terminals. Note: multi-step speed 1 is the low position, multi-step sp …
answered Dec 22 '18 by Transistor
1
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VFDs have various parameters of interest in your application. Acceleration and deceleration parameters will give a gentle soft start and stop. Several seconds seems appropriate for you application u …
answered Jul 31 '18 by Transistor
0
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To address another aspect: Figure 1. A VFD internal diagram. The DC bus consists of the DC power-rails from the capacitor to the top and bottom of the transistor switches. It should be clear from … would see the DC bus voltage of 460√2 instead. While the average voltage and current could be controlled in the VFD algorithm, the peak voltage could not. It is very unlikely that the winding insulation of a motor rated for 220 V could withstand that level of over-voltage. …
answered Feb 8 '18 by Transistor
0
votes
... can I please implore any one of you to dumb this build down for me or give me a simpler way of doing it ... simulate this circuit – Schematic created using CircuitLab Figure 1. Simple …
answered Jun 12 '16 by Transistor
4
votes
It should be fine but be very careful where you make your earth bond. simulate this circuit – Schematic created using CircuitLab You need to run the DC- all the way back to the DC supply groun …
answered Jan 6 '16 by Transistor
2
votes
This doesn't answer your question which has been well answered by @Ariser, but is relevant to the subject. Be careful with long cable runs between your VFD (variable frequency drive) and the motor …
answered Dec 20 '15 by Transistor