Regarding the pressure controller installed on the pump
Thread Content
There is a pump, and it is there to prevent the pump from continuing to run idle after the material has been pumped out, which could cause damage to the pump. It is now necessary to install a pressure controller on the pump; when the pump is running, if the pressure drops below the lower limit set by the pressure controller, the pump will stop operating. It’s very simple to stop the pump when the pressure is low while it’s running; just use upper and lower limit switches for that. . . But the problem now is that with this electric shock protection in place, the pump cannot be turned on, because when the pump is not in use, your pressure controller remains disconnected. I hope some expert can help take a look. What should be done in this situation?
Rather than controlling the pump, it is better to control the liquid level and use interlocks with the pump
Isn’t it necessary to have a person to operate the material feeding system? Or can the pump be controlled by pressing a two-way switch instead?
No no no, the situation in our factory is quite special; some tanks don’t have level gauges, and it’s not possible for our employees to stay on site the whole time while the pumps are running. Sigh. Speak too much and tears will flow.
{:2_30:}I also think it’s convenient to have interlocking between the pump and the level gauge; I’m not sure what the management thinks about this. Say use a pressure controller. But with pressure controllers, there are these troubles as mentioned above.
Add an interlock for the pump along with a delay module; if it is an open-interlock, add a delay open module, and if it is a closed-interlock, add a delay closed module.
Attach a manual switch next to the pressure switch; when starting the pump, turn the switch to the closed position first, and then disconnect it once pressure is built up. Unless it’s a fully automatic system where there are no operators on site?
Liquid level control and pump interlock: Pressure control is installed on the outlet pipeline; we control the pump to stop when pressure is high and to start when pressure is low