Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 30)

4-2 Maintenance
1502-UM050D-EN-P – June 2013
Routine Maintenance (cont.)
To avoid shock hazards, lock out incoming power and
disconnect the control plug from the contactor before
working on the unit. Verify with a hot stick or meter that all
circuits are voltage free. Failure to do so may result in
severe burns, injury or death.
The following should be carried out on an annual basis or whenever a contactor
is serviced:
1. Cleaning
• Ensure that metal chips or filings are cleaned from around the
electromagnet assembly (coil core pole face and mating armature plate)
as they may affect proper operation of the contactor. Vacuum clean if
necessary.
Note: Do not use compressed air to clean or remove dirt from surfaces
or the enclosure as it will only redistribute the dirt.
• If dirty, clean the white ceramic area of vacuum bottles with a clean lint-
free cloth.
2. Main Contact Inspection
• Visually inspect the wear of the main contacts with the contactor
energized. When any part of the wear indicator line, located on the front
side of the hex shaft, moves up into the bearing, replace all three vacuum
bottles. (Refer to Figure 4.1).
Vacuum Bottle
Wear indicator line
On operating shaft
Vacuum Bottle
Wear indicator line
On operating shaft
Figure 4.1 – Vacuum Bottle Wear Indicator
A T T E N T I O N A T T E N T I O N