Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 156)

146 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Chapter 10 Maintenance
Some parts of other devices are factory lubricated – if lubrication during use or
maintenance of these devices is needed, it will be specified in their individual
instructions. If in doubt, consult the nearest Rockwell Automation sales office for
information.
Vacuum Bottles
The contacts in a vacuum bottle cannot be seen or examined directly. They rely
on the high vacuum to operate properly and to interrupt current. Visually inspect
the wear of the main contacts with the contacts closed. When any part of the
wear indicator, located on the front side of the hex shaft, moves up into the
bearing, replace all three vacuum bottles (see Vacuum Contactor User Manual).
The vacuum level should be tested periodically by applying high voltage
alternating current across the open bottle using a vacuum tester or Hi-Pot
equipment (see Vacuum Contactor User Manual).
Terminals
Loose connections can cause overheating that can lead to equipment malfunction
or failure. Check the tightness of all terminals and bus bar connections and
securely tighten any loose connections. Replace any parts or wiring damaged by
overheating.
Coils
If a coil exhibits evidence of overheating (cracked, melted or burned insulation),
it must be replaced. In that event, check for and correct overvoltage or
undervoltage conditions, which can cause coil failure. Be sure to clean any
residues of melted coil insulation from other parts of the device or replace such
parts.
ATTENTION: Allen-Bradley magnetic starters, contactors and relays are
designed to operate without lubrication – do not lubricate these devices since
oil or grease on the pole face (mating surfaces) of the operating magnet may
cause the device to stick in the “ON” mode. Erratic operation can result with
injury or death.