11-2 Maintenance
1560D-UM051D-EN-P – February 2005
Periodic Inspection (cont.) 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.
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
Publication 1502-5.0).
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 Publication 1502-5.0).
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.
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