OP
RogerMorris
DIY
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Yes. The reading will change day to day
Discuss Can a difference in phase voltages cause a motor to fail? in the UK Electrical Forum area at ElectriciansForums.net
I'm not the best to advise on choice of vsd, but yes. May be a much cheaper solution than changing the motor and may offer other advantages.Do you mean something like this
Post #11 The motor is a Grundfos 3VC 2.2kwHe said earlier it is 2.2kW so well within the sane range for a single phase supply.
I’d be inclined to contact both grunfos and the vsd company you listed with as much detail as you can and get their input. But as already said a vsd will need setting up I’m not sure that could be done pre delivery probably best on sitesorry VSD
I also wondered about that. Normally speaking the mcb, s will only trip if they can't handle the staring current. The overload will trip if the motor is being overworked. But what about thermistor protection?. They are generally more sensitive to overheating than overloads. Its many years since I worked with motors but I would have thought that overload protection has moved on to the point where issues like the OP, s have being minimisedYou raise a point I missed @Lucien Nunes, why no protective devices tripped here to prevent the failure.
The voltage imbalance that we speculate may have caused the demise of the motor would also play havoc with the VSD giving unwanted voltage DC bus ripple, this could cause unwanted tripping and/or reduce the life of the DC Bus cap's - we can however combat this by fitting DC chokes in combination with AC line reactors but we are ending up over egging the pudding here when we simply can eliminate the whole problem with a 1PH - 3PH VSD.Would not a 3Ph to 3Ph VFD stabilise the voltage and allow the existing pump to be used, Invertek where very helpful when I was looking to slow my swimming pool pump down, may be worth contacting them: Variable Frequency Drive Manufacturer | Variable Speed Drives | AC Drives | Invertek Drives - https://www.invertekdrives.com/
I think it is one solution of a few out there, a three phase voltage stabiliser is another and automatic one at that as it appears your voltage balance is somewhat unpredictable.So do you think a VSO is the best way to go?
Reply to Can a difference in phase voltages cause a motor to fail? in the UK Electrical Forum area at ElectriciansForums.net
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