Who will supply power to the pump’s signal?
Thread Content
Typically, the signals related to pumps that are directly involved with DCS and MCC include the DCS start command, DCS stop command, DCS pump fault status indication, DCS pump operation status indication, DCS pump current status indication, and DCS pump frequency control command. Who is responsible for providing power for these signals? DCS start command, DCS stop command: DCS dry contacts supply power to the electrical system (MCC is responsible for powering the circuit). DCS pump fault status indication, DCS pump operation status indication: MCC dry contacts supply power to the DCS (DCS is responsible for powering the circuit). DCS pump current status indication: DCS is passive (MCC is responsible for powering the circuit). DCS pump frequency control command: DCS is passive (MCC is responsible for powering the circuit). Is that correct?
DCS start command, DCS stop command: DCS dry contacts supply power to the electrical system (the MCC is responsible for supplying power to the circuit). Yes, the relays are isolated and labeled for safety reasons. Indication of DCS pump fault status, indication of DCS pump operation status: MCC dry contacts supply power to the DCS (the DCS is responsible for powering the circuit); indeed, relay isolation is used, with 24V DC power supply. Indication of DCS pump current status: The DCS is passive (the MCC is responsible for powering the circuit); the current indication signal is in the 4-20mA format, and it can be powered by the DCS. Instructions for frequency control of the DCS pump: The DCS is passive (the MCC is responsible for powering the circuit); the frequency control signal is also in the 4-20mA format, and it can be powered by the DCS as well. It depends on whether the frequency converter requires an active signal or a passive signal
Our approach is the same as what the original poster mentioned. Personally, I think it’s quite convenient for checking the signal this way.
It’s written very clearly here: https://baijiahao.baidu.com/s?id=1586469231422679736&wfr=spider&for=pc