One of our customers is a municipial water authority. They have several deep well pumps. The one well pump is on a vfd to slow it down because they put a new pump in and it pumped way too fast.
They also have a plc that monitors the amperage of each of the well pumps and will fault out if the pump current gets too high or too low. Each winter, we have the issue where the plc will start throwing a fault for low current on the pump with the vfd. It will work fine all summer long, but on some of the cold days and weekends, it will trip out sometimes a couple times a day.
What we are trying to figure out is what would cause the pump to pull low amperage when it is cold. Naturally, we would assume it could be running out of water, but why does that change when it is cold?
From the vfd to the pump is approx. 500' but we have filtering etc. This is basically the only issue we have with this. Any suggestions what we should check or upgrade?
They also have a plc that monitors the amperage of each of the well pumps and will fault out if the pump current gets too high or too low. Each winter, we have the issue where the plc will start throwing a fault for low current on the pump with the vfd. It will work fine all summer long, but on some of the cold days and weekends, it will trip out sometimes a couple times a day.
What we are trying to figure out is what would cause the pump to pull low amperage when it is cold. Naturally, we would assume it could be running out of water, but why does that change when it is cold?
From the vfd to the pump is approx. 500' but we have filtering etc. This is basically the only issue we have with this. Any suggestions what we should check or upgrade?