Installing Additional MCC Units

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.

Position the midshelf (Shelf and Door Installation, Item A) in the appropriate area of the structure.

Shelf Installation Kit Parts Description Qty Assemble per Item Shelf 2 Shelves are furnished with order. Structure may already have shelf mounted in position. * Steps 2 and 3 A Flat head screws 4 Step 3 D Unit door 1 Step 4 F Round head Torx® screws 4All necessary hardware for typical shelf installation is included. Door installation may require additional hardware* Steps 4 and 5 H Quarter turn fastener receptacle 2All necessary hardware for typical shelf installation is included. Door installation may require additional hardware* Step 5 J

Midshelf for Arc-Rated MCCs

Place the mounting foot (Shelf and Door Installation, Item B) of the shelf into the mounting pan slots (Item C). Secure the shelf at the mounting foot end, the left side, and the right side with flat head screws (Detail A,
Item D).

Install the hinge leaves of the door (Detail A, Item E) into the hinge slots (Item G), which are on the structure corner channel. Fasten the hinge leaves to the structure corner channel using Torx head screws (Item H).

Install fastener receptacles (Detail B, Item J) into the bracket slots (Item K) and fasten with Torx head screws (Item H).

If a grommeted wireway barrier is supplied, locate the vertical wireway grommet (see Cutting the Vertical Wireway Grommet (when supplied)) nearest the bottom of the control unit. Cut the grommet following the instructions on the grommet. See the second paragraph under Load and Control Wiring.

Cutting the Vertical Wireway Grommet (when supplied)

Remove the manual bus shutter(s) (see Removing the Manual Bus Shutter) to allow insertion of the new control unit; slide out the top bus shutter.

Removing the Manual Bus Shutter

Insert unit into MCC as follows:

All Units Except Compac 6 (6-inch-high) Units

1. Confirm the cam mechanism is in the open position and the disconnect handle is in the off position ; position the mounting slides of the control unit onto the slots of the mid-shelf. Slide the unit inward to engage the cam mechanism (see Engaging the Cam Mechanism).

   Engaging the Cam Mechanism

   

2. Press the handles inward until they are flush with the face of the MCC (see Handles Flush with the Front of the MCC).

   Handles Flush with the Front of the MCC

   

3. Turn the screw on the control unit lock-in panel (when supplied) located at the bottom front of the control unit (see Tightening the Control Unit Lock-in Panel (when supplied)), until the lock-in pawl is latched to the support shelf below the control unit.

   Tightening the Control Unit Lock-in Panel (when supplied)

   

Compac 6 (6-inch-high) Units

1. Position the mounting slides of the control unit onto the slots of the midshelf. Slide the unit inward until the unit is halfway in, then move it inward with a quick push. This movement easily overcomes the compression of the stabs as they engage the vertical bus (Reinstalling the Compac 6 Control Unit).

   NOTE: The interlock is spring loaded and engages automatically when the control unit is inserted with a firm push to the operator handle. Pressing the structure interlock release is not necessary.

   Reinstalling the Compac 6 Control Unit

   

Pull the power leads from the vertical wireway through the grommet and into the control unit.

All Units Except Compac 6 (6-inch-high) Units

1. Connect the power leads to the power terminals in the control unit (see Power Leads Connected to Power Terminals).

   NOTE: To provide additional working clearance, grasp the control station plate on the right side and pull gently, allowing it to hinge open (see Connecting Control Leads to the Terminal Blocks).

   Power Leads Connected to Power Terminals

   

Typical Unit Torque Label

Compac 6 (6-inch-high) Units

1. Connect the power leads to the power terminals on the starter. Refer to the torque label on the right inside wall of the unit for load terminal wire and torque requirements (see Typical Unit Torque Label).

   NOTE: Removal of the control station plate may be necessary to install power and control wiring. For detailed steps, refer to Step 4 in Removing the Compac^™ 6 Control Unit.

Pull the control leads from the vertical wireway through the grommet and connect them to the terminals of the top (removable) portion of the control pullapart terminal blocks (see Connecting Control Leads to the Terminal Blocks and Pull-apart Terminals).

All Units Except Compac 6 (6-inch high) Units

Connecting Control Leads to the Terminal Blocks

Compac 6 (6-inch) Units

Pull-apart Terminals

10 A Control Wire Terminal Block

• To separate or remove the top portion of the terminal block from its base, grasp the top half and pull apart as shown.

• Each terminal is rated for one 16-12 AWG wire or two 16 AWG wires.

• Torque terminal screws to 5 lb-in (0.5 N•m).

Close the unit door and secure the fasteners.