80459-641-01E Model 6 Motor Control Centers
10/2012 Section 6—Maintaining the MCC
© 1999–2012 Schneider Electric All Rights Reserved
57
ENGLISH
Removing the Control Unit
3g
The Model 6 MCC is designed for convenient and quick control unit removal
and replacement. Follow these steps to remove control units:
1. Turn off all power supplying this equipment before working on or inside
the equipment, and follow lockout/tagout procedures. Always use a
properly rated voltage sensing device to confirm the power is off.
2. Move the operator mechanism to the OFF position (see Figure 72).
3. Loosen the captive fasteners (see Figure 73) on the door and open it.
Use a properly rated voltmeter to check for live circuits. De-energize any
voltage sources.
NOTE: Arc-rated units have additional fasteners at the top-middle and
bottom-middle of the door that must be loosened to open the door (see
Figure 74).
4. Release the lock-in device located at the bottom front of the unit (when
supplied) by turning the screw on the front of the device until the locking
pawl is parallel to the bottom of the unit (see Figure 75).
Figure 72: Operator Mechanism
in the OFF Position
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E 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.
• Do not attempt to remove the unit from the structure with the disconnect
in the on position.
• The control unit is interlocked with the MCC structure to prevent the unit
from being withdrawn while the disconnect is in the on position. Do not
attempt to override the mechanism-to-structure interlock.
• Replace all devices, doors, and covers before turning on power to this
equipment.
Failure to follow this instruction will result in death or serious injury
Figure 73: Loosening Captive Fasteners
Figure 74: Arc-Rated MCC Door Latches
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