Rockwell Automation 2100 CENTERLINE Bolted Pressure Contact Switch - Manual (Page 8)

Publication 2100-IN049B-EN-P - February 2008
8 CENTERLINE ® 2100 Motor Control Centers 600A, 800A, and 1200A Bolted Pressure Contact Switch
•
600A BPS = 5,000 operations
•
800A BPS = 3,500 operations
•
1200A BPS = 2,500 operations
Note: For more information on BPS temperature analysis, refer to
Service and Repair Guidance for CENTERLINE Low Voltage Motor
Control Center Units, publication 2100-TD028.
A complete inspection of the device should always be made:
•
After the BPS has interrupted a ground fault, or has been
involved in an incident that caused one or more of the fuses to
blow.
•
If overheating is observed. Verify that the switch blades and
crossbar close fully and that the joint has been bolted properly.
Verify that the switch and the connecting bus (or cable) are
properly sized for the load current. For switches requiring
ventilation, verify that the vents are open and adequate in size.
In some cases, overheating can be a result of severe conditions
not easily observed, such as harmonics. A knowledgeable
electrical professional may be needed to identify the cause of
the problem and offer solutions.
At regular inspection periods, the BPS should be operated without
power connected. Check for proper function and freedom of
movement (no sticking or binding) for the disconnect handle
operating and defeater mechanisms. Replace broken, deformed,
malfunctioning or badly worn parts or assemblies. Check to see that
the blades close and open fully. The blades should be vertical when
the switch is closed, and rotate approximately 45 degrees upon
opening. Clear separation between the blades and jaw contacts should
be observed when the switch is open. Also observe the rotation of the
crossbar to verify that it travels completely. On most switches, the
crossbar rotates approximately 90 degrees.
ATTENTION
Follow NFPA 70E safety guidelines when working on
energized equipment.
To prevent injury or death to personnel lubricating
disconnect switch contacts, make sure the motor
control center power source(s) is disconnected and
the respective disconnect(s) is locked in the OFF/O
position. For plug-in units, remove the unit from the
motor control center.
To prevent personal injury or damage to equipment,
make sure that the unit handle operator is in the
OFF/O position before removing the unit.