Switch positions of high and low pressure pumps
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Hello everyone, I have a question: 1. Under normal circumstances, why do low-pressure pump switches come in manual, off, and DCS modes? And are the high-pressure pumps only available in manual and DCS versions? 2. When the low-pressure pump is running and is in manual mode at that time, I want to switch it to DCS; the sequence of settings for the switch is Manual = Off = DCS. This process is quick, and at the moment the switch is set to Off, should the pump be stopped?
If you control it, the motor will also stop gradually; if its speed is high, it will stop slowly. It’s just like a car – it’s impossible to bring it to a stop instantly when driving fast.
We have used it before; when the pump is in operation, the control is manual on site, and it needs to be switched to automatic mode via the DCS. The sequence of switches required is manual = off = DCS. As long as the process is fast enough, the operation of the pump is not affected. After the switch is made on site, the DCS is then switched to automatic mode.
Whether it’s on-site. In DCS, the disconnected state is a locked condition; at this time, neither the field site nor the DCS can be operated!
Dude, the switch you’re talking about is an operation mode switch; in this case, the operating state of the motor doesn’t necessarily change； The start and stop of the pump motor are controlled by separate switches or relays!