Rockwell Automation 2500 CENTERLINE Motor Control Centers Installation Manual - Manual (Page 52)

52 Rockwell Automation Publication 2500-IN001C-EN-P - April 2014
Chapter 5 Door Latches, Operator Handles, and Unit Interlocks
Opening the Unit Door in the ON/I Position
When the unit door is closed and the small rotary-operator handle is in the
ON/I or TRIPPED/T position, a defeater screw must be deliberately operated
to open the unit door.
1. Release the door latches.
2. Locate the defeater screw on the lower right corner of the small rotary-
operator handle.
3. Use a flat blade (number 2) screwdriver to turn the defeater screw 10°
(maximum) clockwise.
4. Carefully open the unit door.
Operator Handles for Circuit Breakers
In the event of a circuit breaker fault, the circuit breaker operator handle moves
to the TRIPPED/T position. Only reset the circuit breaker after the cause of the
fault has been determined and corrected.
Follow these procedures to reset the circuit breaker.
1. Turn the small rotary-operator handle to the OFF/O position; see
Figure 17 on page 51 .
2. After the fault has been corrected, verify that it is safe to re-energize the
unit and turn the small rotary-operator handle to the ON/I position.
ATTENTION: Follow local codes and guidelines in addition to the
requirements of EN 50110 when working on energized equipment.
Handle in ON/I Position Handle in Tripped/T Position
10° maximum
turn clockwise.
Defeater Screw