Power supply for current, power, and frequency conversion control signals between DCS and MCC?

The DCS (Distributed Control System) is typically responsible for sending control signals, while the MCC (Motor Control Center) handles the power supply and control of the motors. In most cases, the supply of current and power is provided by the MCC, as the MCC is used for the centralized control of motors. Regarding the variable frequency control signals, the DCS is typically responsible for generating these control signals, which in turn control the frequency converters in the MCC to adjust the speed of the motors. The signal itself is generally generated by the DCS and can be an analog signal (such as 4-20 mA) or a digital signal. As for the signal power supply, generally, the power for control signals can be provided by the DCS; however, an external power supply may also be required, depending on the type of signal and the specifications of the power needed. As for whether the cards in a DCS are passive or not, it depends on the specific design of that DCS system. In some systems, the DCS output cards may provide the required power on their own (active output), while in other systems an external power source is needed to drive these signals (passive output). The specific connection method will vary depending on the DCS system used and its configuration. .

The current and power signals from the MCC are generally transmitted to the DCS as 4-20mA active signals (485 communication is also possible) by electrical devices such as current transmitters, frequency converters, and motor protectors in the MCC; no additional power supply is required. The control signals for the MCC’s frequency converters are also sent from the DCS in the form of 4-20mA active signals (485 communication is also possible), again without the need for an additional power supply.

It’s still pretty good, isn’t it? Haha