Possible electromagnetic interference with ECM Wilo Stratos?

Tom Hopkins

Anyone know if the Wilo stratos create harmonics or electromagnetic interference like the Variable Frequency Drives. I have an application with very sensitive electrical and communication equipment nearby. In the past, they did have some problems with interference created with Variable Frequency Drives.

Luc

Rudnae

ask steve

Luc, you should ask Steve Thompson from Wilo, if anyone can get you the straight answer on that one it would be him. steve.thompson@wilo-na.com.

Tom Hopkins

Thanks for the reference. I will contact steve.

Mark Hunt_5

Quick answer


No.

The Stratos will not interfere with other equipment.

Hope this helps.

Mark H

Nikolasvipam

Variable frequency drives

VFD's do not cause EMF interference. They cause voltage and current harmonics in the odd frequencies such as (3rd harmonic) 180hz, (fith harmonic)300hz etc... You can offset overloading with current harmonics by raising the neutral wire gauge or designating seperate neutrals. You could also defer harmonics by a better VFD that uses a 8 pulse versus 4 pulse or 12 pulse versus 6 pulse with 3 phase.

Tom Hopkins

Thanks Mark and Larry

Larry_52

ISO Xfmr

sometimes it is a good idea to use an isolation transformer in the line to any VFD equipment, will help on starting and also eliminates any DC interference in the line.

Mark Hunt_5

Larry

The Stratos is self contained, the only line to it is the 230 volt power supply.

Mark H

Larry_52

Mark

Understood, if there is a SCR system involved with the pump there would be nothing wrong with having an ISO Xfmr in line of the feed. The ISO Xfmr does not change voltage, 230V in = 230V out it just seperates the two lines from each other eliminating any DC interference down the line from a crappy VFD. For the given load size it would be very small.

Supply House Rick

Please remember

If the AHR doesn't equal the PDY then you must adjust the PCP with the VSD and the PCB or you will end up with ECM+EC2=Y

Seriously, no really

Supply House Rick

I figured that out

That formula delegates cavitation to it's proper revolutions and capacitizes the utility of impellerizations in a reverse polarity ceramic capacity. Hope that clears this up in lay-mans terms... Go Wilo