VFD reactors
VFD reactors
(OP)
Is it appropriate to install both a line ractor and load reactor (dV/dt filter) to combat: harmonics on the source feeders, and IGBT effects on long motor leads, respectively. I am assuming our motors were not spec'd as inverter duty rated. The various drives range from 30, 45, 75, and 100 hp @ 460V. Motors (pumps) are in washdown and GMP areas, so the MCC's are pretty far away, about 200 feet. (NEMA 4x drives are out of the question.) Also, is anyone really familiar with Allen Bradley VFD's. I cannot determine wether or not the line / load reactors are internal to the VFD buckets or are seperate and would be mounted on top of the MCC's for example.





RE: VFD reactors
Watch out for ringing across the motor reactors if the cables are long. You may need some damping there. Better talk to the VFD supplier.
Gunnar Englund
www.gke.org
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100 % recycled posting: Electrons, ideas, finger-tips have been used over and over again...
RE: VFD reactors
Better that just a load reactor though is an LC filter system, sold by many of the same people as the simple reactors.
Line reactors are a minimal approach to harmonics on the line side. Better than nothing, but there are many better ways to approach it if you can afford it.
JRaef.com
"Engineers like to solve problems. If there are no problems handily available, they will create their own problems." Scott Adams
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RE: VFD reactors
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RE: VFD reactors
The reduced charging currents into the cable and motor capacitance will enable you to increase the potential length of the cable.
The Line reactors have two effects, they help to reduce the harmonics in the incoming line current and they build out the supply impedance so that the effects of the capacitive circuit to ground is reduced. The effects of the line reactors on reducing the output charging currents is often limited by capacitance added to the DC bus to ground to reduce the EMC radiation from the supply cables.
The best answer is to talk to the suppliers and find the best solution for your equipment and installation.
Best regards,
Mark Empson
http://www.lmphotonics.com