Vacuum bottles, Terminals, Coils – Rockwell Automation 7763 Medium Voltage OneGear SMC Flex Motor Controller (10-15 kV) User Manual
Page 116: Solid-state devices, Vacuum bottles terminals coils solid-state devices
116
Rockwell Automation Publication 7760-UM001D-EN-P - October 2014
Chapter 9
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.
Refer to Vacuum Contactor or Breaker User Manual for service instructions.
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.
Solid-State Devices
Solid-state devices require little more than a periodic visual inspection. Printed
circuit boards should be inspected to determine whether all cables are properly
seated in their connectors. Board locking tabs should also be in place. Necessary
replacements should be made only at the PC board or plug-in component level.
Solvents should not be used on printed circuit boards. Where blowers are used,
air filters, if supplied, should be cleaned or changed periodically depending on
the specific environmental conditions encountered. For additional information
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.