Unusual 30 HZ vibration on motor with VFD - Eng-Tips
2003年2月5日 · Adjustments to the carrier frequency from 2kHz to 6 Khz made very little difference. Tweaking the controls and tightening connections, etc. seem to have reduced the …
Measuring output of a VFD 4 - Eng-Tips
2003年2月7日 · The reason is that they take into consideration all frequencies involved up to several kHz. If you want to measure the RMS-Value of the fundamental you can use a low …
sharing signal and power ground - Circuit design | Eng-Tips
2005年7月18日 · I generally share the signal and power ground together for analog(and mixed circuits <1 KHz).Does this practice introduce noise in the system. The circuits many times …
Plastic material which is permeable for IR (infra red) signals 3 - Eng …
2024年10月31日 · IR is in the THz range and ultrasonic is above about 20 kHz . Upvote 0 Downvote. May 8, 2008 #7 IRstuff
Grounded vs ungrounded capacitor banks 1 - Eng-Tips
2005年7月8日 · As far as Cannons' Technology, it is simply a case of their 12.5 Khz signal being shunted to ground due to the low impedance of the caps at that frequency (which is the reason …
Possible reasons for VFD line reactor failure? - Eng-Tips
2002年5月29日 · It sounds like a core heating thing. To be able to judge if that is the case, one needs to look for capacitors (or long cables) to resonate with. Reactor/capacitor combinations …
How to test a speaker voice coil(raw part, not assembled to …
2004年3月27日 · Yes. It makes quite a difference. The Q will go down the sink if you get a single shorted turn, regardless of where in the coil. The Operahouse method could be applied easily, …
Accuracy of fluke meter to measure inrush current - Eng-Tips
2007年5月16日 · The early electronic meters measured the peak current and scaled it to guess what the RMS may be. Now when a motor starts there is a high inrush in the first cycle or so …
plc communication over high voltage cables using inductive …
2006年8月7日 · I am testing plc equipment over 25kV power lines using inductive clamp couplers. I find that data transfer speeds are higher in the direction of the load. I intuitively understand …