About Mcc control center
This article is for the design, basic concept and testing of 600 V class motor control centers (MCC) to be installed indoors in non-hazardous areas. Main keywords for this article are Motor Control Center Design Guide, Motor Control Center Layout, MCC Schematic Diagram, Motor Control Center Wiring Diagram, MCC Panel Components.MCC ReferencesNational Electrical Manufacturer’s Association (NEMA) ICS 1 General Standards for Industrial ControlsICS 2 Standard for Industrial Control Devices, Controllers and AssembliesUL 489 Molded Case Circuit Breakers and Circuit Breaker EnclosuresNational Electrical Code (NEC) Article 450-3(b)Underwriters’ Laboratories (UL) 489 Molded Case Circuit Breakers and Circuit Breaker Enclosures845 Motor Control CentersThe grouping of motor starters of the same operating voltage into modular, self contained MCC‟s shall be the preferred configuration.MCC shall be configured and wired as detailed in NEMA ICS 2.MCC shall comply with the provisions of UL 845. Measurements shall be in SI units.All units shall be accessible, interchangeable to the same size, and removable from the front of the MCC. Rated voltage and current for MCC shall be based on 60 Hz or 50 Hz.Motor Control Center LayoutMCC Schematic DiagramMain keywords for this article are Motor Control Center Design Guide, Motor Control Center Layout, MCC Schematic Diagram, Motor Control Center Wiring Diagram, MCC Panel Components.Motor Control Center Wiring DiagramMCC Structural RequirementsCommon Enclosure and Cubicle DesignThe vertical sections of MCC shall consist of one or more standardized sections, bolted together to form a rigid, self-supporting, free-standing assembly, with capability for addition of further sections to either end.Each vertical section shall be isolated from adjacent sections by steel barriers.MCC shall have easily connectable assemblies of up to four vertical sections, bolted together as shipping sections. Lifting angles shall be installed on the tops of all shipping sections.Main MCC enclosure shall have a metal thickness of 2 mm minimum, in accordance with UL 845.MCC shall be dead front and dead back construction, with all required access provided from the front. It shall be possible to install MCC assemblies back-toback, against the wall or free-standing away from the wall.Each vertical section shall be provided with a minimum 229 mm top, and a 229 mm bottom, horizontal wireway that shall extend the length of MCC line up. A vertical wireway extending the vertical length of each section shall also be provided. These vertical wireways shall be isolated from the rest of the section by a metal barrier running the full length of the vertical wireways.The top and bottom of each vertical section shall be provided with an adequately sized conduit opening. The opening shall be covered by a bolted steel plate that may be removed and drilled or punched for conduit or cable entrances.MCC enclosures shall be NEMA 1 gasketed, and installed in ventilated
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With an RS 485 interface to enable serial communication of monitored data to remote facility computers.The ATS shall be function tested at the factory along with all other major components of the MCC to insure compliance with all requirements stated on the data sheets.The following operational parameters shall be adjustable for the ATS:(i) Nominal line voltage and frequency(ii) Single or three phase sensingThe following parameter shall be continuously monitored for both the normal and emergency sources:(i) Undervoltage(ii) Overvoltage(iii) Underfrequency(iv) Overfrequency(v) Voltage unbalance(vi) Phase rotation – source shall not be accepted if not matching the selected rotationNote: Main keywords for this article are Motor Control Center Design Guide, Motor Control Center Layout, MCC Schematic Diagram, Motor Control Center Wiring Diagram, MCC Panel Components.Time delaysThe controller shall provide time delays for the following functions:(i) Override momentary outages of normal source(ii) Transfer to emergency(iii) Re-transfer to normal(iv) Re-transfer to normal, test mode(v) On shutdown for engine/general cool downThe controller shall provide one time delay output that may be used for any of the following:(i) Normal to emergency(ii) Emergency to normal(iii) Prior to transfer(iv) Prior to and after transfer(v) Normal to emergency and emergency to normal(vi) All transfer conditions(vi) When both sources are availableMCC Testing and InspectionMCC shall be tested for the following in accordance with UL 845.a. Visual inspection of construction, workmanship, dimensions and internal wiringb. Relay and metering circuits shall be energized and devices checked, to ensure that polarities are correct, elements are in operating condition, and relays are performing the desired functionc. No-load operational tests of contactor shall be performed at maximum, standard, and minimum control voltage ratingsd. Operation of mechanical interlockse. Short circuit testsf. Dielectric voltage withstand testg. Size and rating of each type of equipment, compared to the requirements of the purchase orderh. Factory setting of contact gapi. Insulation resistance testNote: Main keywords for this article are Motor Control Center Design Guide, Motor Control Center Layout, MCC Schematic Diagram, Motor Control Center Wiring Diagram, MCC Panel Components.
