How to transmit the pump operation signal from the electrical system to the instruments
Thread Content
Thank you all. In the past, a 220V relay should have been used for electrical connections; when the relay is activated, it is displayed on the DCS. . What if it’s not just a run signal? ? The DCS has a start-up pump – how are the signals sent over? ?
It’s the same; generally, it’s done through an isolation relay, with the dry contacts being used for that purpose. The electrical contactor or the comprehensive protection coil is powered.
Can a single point achieve both control and feedback? ?
It definitely isn’t the same point; for DCS, one is DI and the other is DO
I encountered a problem today: the operation signal of a pump affects the shutdown of the boiler, and the relay doesn’t dare to activate. Can the operation signal of a chemical dosing pump cause the boiler to shut down? ? It left me completely confused
I’ve started to doubt the knowledge in my head, so I’m posting a question – it was something said by an older worker at our factory
Because the operation signal of your pump is part of the interlock system, it is not just a simple operation indicator. It is possible to carry out repairs as well; a BYPASS or forcing of that point will work. Remember to restore the interlock after the repairs are completed.
It usually comes from the electrical system, goes to the cabinet room, and is connected via hard wiring
It is recommended to take a look at the electrical control schematic diagram, so that you can understand it.
1. The indicator of the pump’s operating status is a DI signal, which is sent from the MCC to the DCS. This DI signal is of the dry-contact type, and it is powered by 24VDC from the DCS. 2. The start or stop signal DO sent by the DCS is transmitted as a DO signal from the DCS to the MCC via dry contacts; the MCC provides power to these contacts, usually at 220VAC or 220VDC. It is important to note that the capacity requirements for these contacts vary. With this explanation, the original poster should be able to understand.