Model 6 Motor Control Centers – Instruction Bulletin PDF
80459-641-01, Rev. 09

Introduction

DANGER
Hazard of Electric Shock, Explosion, or Arc Flash
  • Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, NOM-029-STPS-2011, or CSA Z462.
  • This equipment must only be installed and serviced by qualified electrical personnel.
  • Turn off all power supplying this equipment before working on or inside equipment.
  • Always use a properly rated voltage sensing device to confirm power is off.
  • Replace all devices, doors, and covers before turning on power to this equipment.
Failure to follow these instructions will result in death or serious injury.

The automatic vertical bus shutter is an optional feature for the Model 6 motor control center (MCC) vertical bus. The shutters are pre-assembled and installed as part of the MCC line-up.

Automatic bus shutters open and close the vertical bus connection point when units are inserted and removed from the structure. The shutters can be located throughout the MCC and placed in 6 in. (152 mm) increments. They mount to the left edge of each midshelf.

The automatic shutter assembly requires an updated midshelf to allow clearance for the shutter above the plug-in unit.

NOTE:

  • MCC structures shipped before January 2003 cannot use the top 3-in. (76 mm) space with the automatic vertical bus shutter option. A 3-in. (76 mm) cover plate is required to cover the opening.

  • Compac™ 6 control units shipped before January 2003 cannot be used with the automatic vertical bus shutter option.

  • Variable frequency drive and soft starter units 45 in. or taller that shipped before July 2003 with a side-panel opening, as shown in Location of Auto-Shutter Cover for Side-Panel Opening, View A, require an auto-shutter cover (Square D Seneca part #80451765-01). The auto-shutter cover aligns with the back edge of the center-most flat head screw, as shown in Location of Auto-Shutter Cover for Side-Panel Opening, View B.

Location of Auto-Shutter Cover for Side-Panel Opening
View A View B

There are four main components of the automatic vertical bus shutter (see Automatic Vertical Bus Shutter in an MCC (front view)):

  1. Operator Mechanism: Operates the vertical bus shutter, allowing the plug-in unit to engage the vertical bus.

  2. Mechanism Housing: Protects the mechanism from incidental foreign material that could obstruct the intended operation.

  3. Vertical Bus Door and Clip: Provides a barrier against incidental contact with the MCC vertical bus.

  4. Manual Shutter: Prevents access to the unused vertical bus openings. The manual shutter is held in place by a built-in locking feature that holds the shutter in the closed position during shipping, set-up, and daily operations.

Automatic Vertical Bus Shutter in an MCC (front view)
Style 1 Style 2

Compare the field-installed midshelf to the two designs above. If the fieldinstalled midshelf matches Style 1, follow the installation and removal instructions starting below. If the field-installed midshelf matches Style 2, follow the instructions starting on page Installation—Style 2.

NOTE: Arc-rated MCCs have a midshelf specifically designed for arc-rated MCCs (Schneider Electric part no. 80466-007-50; see Midshelf for Arc-Rated MCCs). This midshelf includes arc pressure relief flaps and must be used when installing arc-rated MCC units to maintain the arc containment ratings.
QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and other countries.

Was this helpful?

Contact Information
Legal Information
Privacy Policy
Change your cookie settings