Thank you, waross.
In fact, leading power factor is with load.
The captured values are with pump running.
Unfortunately I haven't captured exact power factor number, but it was leading.
Thanks again.
Thank you, everyone.
I was on site yesterday and this is what I've captured from the PQMII screen:
Van= 357V at 0 Lag
Vbn= 353V at 240 Lag
Vac= 355V at 120 Lag
Ia = 14A at 334 Lag
Ib = 13A at 207 Lag
Ic = 12A at 95 Lag
Thank you.
Observing power factor on PQM at one of the sewage pumping station we noticed that power factor become negative (≈-0.85) when one of the pumps is running.
Assuming that some capacitive load in the VFD motor circuitry exist, we can accept this situation.
When there is no pump running pf is 0.98...
Hi TugboatEng,
Thank you for your prompt post.
Although Vibration Fork is excellent method, I am afraid is not suitable for wet well application.
Best,
Filip
Hi,
I am looking for the option to replace 'classic' float switches used in sanitary pumping applications, with something more reliable with less maintenance.
Maybe some type of capacitive proximity switches?
We need four switches for LoLo, Lo, Hi, and HiHi alarm, connected to the PLC digital...
Hi everyone,
First of all, I want to thank to you guys for the very good insight.
In this particular case, the problem is related to the VFD Tuning Capacitors (Eaton VFD SVX9000 Series).
Although, not related to this situation, I consider the explanation related to the Start/Stop very important...
Hi,
I am currently working at one pumping station with 3 VFD pumps (asynchronous motor, 208V, 42kw.
The strange thing is when panel is powered with no pump running VFD draws about 50A per phase.
Rest of the load is disconnected. How this is possible?
Could someone explain this situation.
RSTENG
Hi,
I am currently reviewing one application for CPU 1769-L32E created with RSLogix5000 ver17.
I came accross very strange way of programming using outputs in series. In one example I foung three output contacts OTE, OTL and OTU in the same rung.
Please explain what exact problem could be a...
