Control of mechanical pumps
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How is DCS used to control pumps? What is the specific circuit, and what components are included in that circuit?
The DCS sends signals to the electrical MCC via DO cards to control the start or stop of the pumps. The DO card is used for relay isolation, while the manual signal is connected to the electrical control circuit; the wiring methods for high-voltage and low-voltage circuits are different.
Is the circuit controller-DO card-relay-MCC-pump, is that correct?
Currently, simcode is used to control motors in some larger combined systems; for example, the control of on-site pumps is achieved through DCS communication or by direct wiring to the simcode. The simcode contains pre-programmed relays that enable interlock control of the on-site pumps.
DCS systems have many functions and are quite flexible to use, though the DCS systems from different manufacturers vary to some extent. Generally, a control panel is displayed on the screen, with start and stop buttons; just select the appropriate one. The output signals can be either status values or pulse signals.