Motor Control Centre (MCC)
Intelligent Motor Control Centre (iMCC)
Motor Control Centre Design
Motor Control Centre Components
Motor Control Centre Specifications
Motor Control Centre design and specifications
Motor Control Centre Maintenance
A motor control center (MCC) is an assembly of one or more enclosed sections having a common power bus and principally containing motor control units. Motor control centers are in modern practice a factory assembly of several motor starters.
Motor control centre specifications
Following are the general specifications for MCC panel. End user can update the specification as per specific requirement.
1. Refer scheme drawings for wiring details of each feeder or feeder type. Scheme drawings are guidelines and following details shall be met.
a. Ammeter for motor feeders shall be part of display unit
b. Motor space heater power supply (interlocked type) MCB shall be provided for motor feeders rated 45kW and above.
c. Earth leakage relay & CBCT shall be provided for all motor feeders
d. Thermister relay (may be part of micrprocessor based OLR) shall be provided for motor feeders rated 75kW and above.
e. For high inertia loads such as fans, blowers, compressor etc.relay shall be provided proper trip curve to avoid nuisance trip during starting.
f. Direct on line starters shall be provided for motors rated up to and including 22kW. Star delta starters shall be provided for the motors rated 30kW and above.
2. Stud type terminals along with nut and bolt shall be provided in the feeders cable size of 16 sq.mm or more will be terminated. All terminals blocks shall be fingure touch proof.
3. The sleeves of busbar shall be of heat shrinkable PVC material. The busbar joints shall be shrouded.
4. Control supply required for each motor feeder shall be tapped before switch using SP MCB & neutral link.
5. Termination of the cables on any feeder terminals shall be safely possible when other feeder of the same cable alley are live. For this purpose, the feeder terminals shall be segregated with hylam sheet and staggered
6. Unused vacant modules shall be fully equipped with hinged door.
7. MCC shall be complete with inter-panel wiring including the necessary wiring between shipping sections.
8. All switches shall be interlocked with door and have defeat interlock mechanism. Switches shall have also padlocking facility in OFF position.
9. Removable undrilled gland plate shall be provided at bottom of each panel. Distance between gland plate and cable terminals shall be 800 mm minimum for incomer feeders and 400 mm minimum for outgoing feeders.
10. Indicating lamps for motor ON, OFF and TRIP, earth leakage indication and an emergency STOP push button shall be provided on door of each motor starter feeder as per scheme diagrams.
11. Bill of material of each MCC type of feeder and each kW shall be submitted separately for approval.
12. Cable clamping supports to be provided in cable alley.
13. Stop PB for each starter feeder shall be mushroom head stayput type.
14. Vendor shall provide marashalling panel with terminals for each motor starter module and interpanel wiring from individual module to these terminals. Marshalling panel shall be provided for all MCCs. Marshalling box to be provided one per shipping section of the MCC.
15. Vendor shall provide cables from each feeder module upto corresponding terminal in marshalling box. Feeder side of this cable shall be terminated at factory & marshalling box side of this cable shall be tagged & kept loose which shall be terminated as per marshalling box termination schedule submitted by MCC vendor. This site work at site shall be done by MCC vendor person.
16. Vendor shall try to provide PSF/SFU feeder at the bottom.
17. Vendor shall furnish GA drawing showing the following details for each MCC along with offer.
a. Overall dimensions of the panel.
b. Length of each shipping section
c. Height of each module
d. Cross, sectional view of panel showing busbar arrangement.
e. Foundation plan indicating size and gland plate
f. Weight of each shipping section
Intelligent Motor Control Centre (iMCC)
Motor Control Centre Design
Motor Control Centre Components
Motor Control Centre Specifications
Motor Control Centre design and specifications
Motor Control Centre Maintenance
A motor control center (MCC) is an assembly of one or more enclosed sections having a common power bus and principally containing motor control units. Motor control centers are in modern practice a factory assembly of several motor starters.
Motor control centre specifications
Following are the general specifications for MCC panel. End user can update the specification as per specific requirement.
1. Refer scheme drawings for wiring details of each feeder or feeder type. Scheme drawings are guidelines and following details shall be met.
a. Ammeter for motor feeders shall be part of display unit
b. Motor space heater power supply (interlocked type) MCB shall be provided for motor feeders rated 45kW and above.
c. Earth leakage relay & CBCT shall be provided for all motor feeders
d. Thermister relay (may be part of micrprocessor based OLR) shall be provided for motor feeders rated 75kW and above.
e. For high inertia loads such as fans, blowers, compressor etc.relay shall be provided proper trip curve to avoid nuisance trip during starting.
f. Direct on line starters shall be provided for motors rated up to and including 22kW. Star delta starters shall be provided for the motors rated 30kW and above.
2. Stud type terminals along with nut and bolt shall be provided in the feeders cable size of 16 sq.mm or more will be terminated. All terminals blocks shall be fingure touch proof.
3. The sleeves of busbar shall be of heat shrinkable PVC material. The busbar joints shall be shrouded.
4. Control supply required for each motor feeder shall be tapped before switch using SP MCB & neutral link.
5. Termination of the cables on any feeder terminals shall be safely possible when other feeder of the same cable alley are live. For this purpose, the feeder terminals shall be segregated with hylam sheet and staggered
6. Unused vacant modules shall be fully equipped with hinged door.
7. MCC shall be complete with inter-panel wiring including the necessary wiring between shipping sections.
8. All switches shall be interlocked with door and have defeat interlock mechanism. Switches shall have also padlocking facility in OFF position.
9. Removable undrilled gland plate shall be provided at bottom of each panel. Distance between gland plate and cable terminals shall be 800 mm minimum for incomer feeders and 400 mm minimum for outgoing feeders.
10. Indicating lamps for motor ON, OFF and TRIP, earth leakage indication and an emergency STOP push button shall be provided on door of each motor starter feeder as per scheme diagrams.
11. Bill of material of each MCC type of feeder and each kW shall be submitted separately for approval.
12. Cable clamping supports to be provided in cable alley.
13. Stop PB for each starter feeder shall be mushroom head stayput type.
14. Vendor shall provide marashalling panel with terminals for each motor starter module and interpanel wiring from individual module to these terminals. Marshalling panel shall be provided for all MCCs. Marshalling box to be provided one per shipping section of the MCC.
15. Vendor shall provide cables from each feeder module upto corresponding terminal in marshalling box. Feeder side of this cable shall be terminated at factory & marshalling box side of this cable shall be tagged & kept loose which shall be terminated as per marshalling box termination schedule submitted by MCC vendor. This site work at site shall be done by MCC vendor person.
16. Vendor shall try to provide PSF/SFU feeder at the bottom.
17. Vendor shall furnish GA drawing showing the following details for each MCC along with offer.
a. Overall dimensions of the panel.
b. Length of each shipping section
c. Height of each module
d. Cross, sectional view of panel showing busbar arrangement.
e. Foundation plan indicating size and gland plate
f. Weight of each shipping section