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Rockwell Automation Publication 2100-IN012G-EN-P - August 2016
Chapter 6
Operator Handle and Unit Interlock
Unit Interlocks
A unit interlock is provided with each plug-in unit. Unit interlocks prevent
units from being removed from or inserted into a vertical section when the
operator handle is in the ON/I position.
Units can also be locked out with a padlock preventing installation of the unit
into a vertical section. The lockout feature of the unit interlock can be used
with a padlock to keep the interlock in an extended position, which prevents
the unit from being inserted into an MCC section. The unit interlock can also
be used with the unit installed in the section, but partially removed from the
section.
In this position, the unit is partially removed from the MCC and the slot in the
interlock plate is in line with the flange of the unit support pan above this unit.
When the unit is locked in this position, the unit power and ground stabs are
disengaged. This position can be used to prevent insertion of a unit into the
MCC.
Figure 38 - Unit Interlock to Prevent Insertion - Vertical Operating Handler
ATTENTION:
When working on or near energized electrical equipment,
follow established electrical safety-related work practices. Refer to NFPA 70E
Standard for Electrical Safety in the Workplace.
We recommend that maintenance performed on the MCC units be performed
away from the MCC in a suitable work area, when possible.