ABB-MNS iS design aspectsSwitchboard arrangements

ABB-MNS iS design aspectsSwitchboard arrangements

MNS iS cubicles can be arranged as follows: • In standard execution (back-to-wall) • Back-to-back • Duplex For switchgear dimensions,  see Technical Data section.

MNS iS design aspects  Frame construction —

MNS iS Design Aspects  Enclosure The basic elements of the MNS iS frame  construction are “C” shaped steel profiles with  a 25 mm hole pitch according to DIN 43660.  This 25 mm equals the dimension of 1E used  in MNS to define the area usage within  the switchgear. Each cubicle is precision constructed by bolting  horizontal and vertical profiles together, to form  a rigid modular structure. The assembly is  maintenance free as a result of the construction method utilizing a combination of thread locking  ESLOK screws with bolted pressure plates and  thread forming screws.  The profiles are galvanic protected (Zn or AL/Zn)  against corrosion. MNS iS switchboard enclosure is made of sheet  steel protected by galvanic coating and powder  coating for maximum durability. The fixing of the enclosure with respect to doors,  roof plates, rear and side walls is achieved with  thread forming screws. Final construction varies  depending upon the required degree of  protection. In accordance with the general safety philosophy  followed with MNS iS, each compartment and  sub-compartment which requires access for  commissioning, operation or maintenance, has its own door.

MNS iS design aspects  Cable compartments Access to components such as electronic  protection relays within standard switchgear is  usually not possible if the module is energized.  As an innovative design attribute MNS iS  switchgear provides separate compartments,  one for power cables on the right hand and  another for control cables on the left hand. The  two cable compartments can be provided with  different key locks in order to assure specific  access rights.  Cable compartment separation is available as an  option up to Form 4. as shown below. Control cable compartment The control cables have their own control cable  compartment completely segregated from the  power compartment. This control compartment houses the scalable  motor control units MControl and serial  communications bus cables.  The control wiring can enter from the top or  bottom as required for the project. Power cable compartment MNS iS motor/feeder cables are housed in their  own power cable compartment completely  isolated from any control equipment or wiring.  The cubicle arrangements are configured suitable  for front cable access.  The power cable compartment can be provided  with cable entry from the top or bottom of the  cubicle.