g.mccormick
Lifetime Supporting Member
I am design/building a booster pump for my house. I found seemingly good deal on a Grundfos pump on ebay and I already have a AD GS1 VFD in the garage from a previous ebay find.
So a pressure transducer, some other parts, and some PLC work will get me a constant water pressure control system for my house. I have a well with submersible pump. This new booster pump will be fed from the existing well pump.
So on to my question. When the demand is 0, i will command the vfd to stop mode. Even in stop mode, the VFD with fan will be taking excess power (probably not much I'll admit). So I was thinking of putting contactor ahead of VFD and shutting off the contactor(power to vfd) if the system has been in idle for some amount of time. This would mean that during day time when everyone is gone or at night when we are all sleeping, the vfd would be powered down.
Is there really any reason that turning on/off the vfd a few times a day will shorten its life?
So a pressure transducer, some other parts, and some PLC work will get me a constant water pressure control system for my house. I have a well with submersible pump. This new booster pump will be fed from the existing well pump.
So on to my question. When the demand is 0, i will command the vfd to stop mode. Even in stop mode, the VFD with fan will be taking excess power (probably not much I'll admit). So I was thinking of putting contactor ahead of VFD and shutting off the contactor(power to vfd) if the system has been in idle for some amount of time. This would mean that during day time when everyone is gone or at night when we are all sleeping, the vfd would be powered down.
Is there really any reason that turning on/off the vfd a few times a day will shorten its life?