MCC is acronyms for motor control center. MCC contains all the switchgears like switch fuse unit, power contactor, auxiliary contactor, overload relay, ampere meter, voltmeter, energy meter and miscellaneous items to control and monitor the operation of the motor.
The conventional MCC has metering class current transformer mounted for each phase to monitor the motor current and energy drawn by the motor. The protection class current transformer is mounted and wired with thermal or electronic overload relay to isolate the supply in the event of overload or fault in the motor.
The MCC has a lot of wirings to incorporate all switchgears, meters and protection relays. The fault history is not available in conventional MCC.
Moreover, troubleshooting is more complex and preventive maintenance schedule is difficult to fix because the feeder fault and maintenance history are not available.
After advancement in the automation, the conventional MCC is now upgraded to the intelligent or smart MCC.
A Smart MCC uses intelligent devices with dedicated controller with profibus communication to monitor & control the motors or other electrical loads.
For Example: In smart MCC, all motor feeders are configured with the required configurations like maximum current, maximum voltage, trips, faults, alarms, etc. All the feeders are configured with a unique slave address (ID) and placed in one or more profibus networks. We can connect upto 126 devices in a network. The real-time motor parameters will be monitored in stand-alone SCADA system or the same data can be transferred to control room PLC or DCS systems.
We can connect and communicate different types of devices in a profibus network like feeders, soft-starters, VFD’s, or any device which supports profibus communication.
A smart device incorporates intelligent devices like current module, voltage module and it’s controller in the MCC which takes the motor operating data and communicate the same to PLC or process control system.
The motor protections like overload, overcurrent, instantaneous over current, locked rotor fault and phase failure is immediately reported to PLC connected to the MCC intelligent device. Thus, the protection is very fast and reliable.
Further, all the motor protection parameters can be programmed remotely from the PLC. The energy, current, voltage, power and running hours is recorded in the computer.
The running hours recorded data can be used for preventive maintenance of the motor.
Author: Satyadeo Vyas
If you liked this article, then please subscribe to our YouTube Channel for Instrumentation, Electrical, PLC, and SCADA video tutorials.
You can also follow us on Facebook and Twitter to receive daily updates.
Read Next:
The conveyor sorting machine is widely used in the packing industries using the PLC program…
Learn the example of flip-flop PLC program for lamps application using the ladder logic to…
In this article, you will learn the STAR DELTA programming using PLC controller to start…
Lube oil consoles of rotary equipment packages in industrial process plants are usually equipped with…
Rotating equipment packages such as pumps, compressors, turbines need the lube oil consoles for their…
This article explains how to blink lights in ladder logic with a detailed explanation video…