Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 33)

Maintenance 4-5
1502-UM050D-EN-P – June 2013
Insulator Stud
Load Terminal Nut
Insulator Stud
Load Terminal Nut
Figure 4.5 – Removal of Vacuum Bottles
5. Install a new bottle by tilting an insulator forward and threading the bottle
onto the stud (reverse of Step 3). Take care to ensure the threads are
aligned as cross-threading can occur. Thread the bottle down, leaving a gap
of approximately 4.82 mm ± 0.25 mm (0.190 in. ± 0.01 in.) between the
top of the bottle and the bottom surface of the line terminal, as shown in
Figure 4.6. Use inside calipers and a micrometer, or another accurate
measuring tool, to set the gap. This gap is precisely calibrated later in this
section. The wear indicator line on the bottom of the bottle’s movable
shaft must be facing forward (i.e. visible from the front of the contactor).
Repeat this step for the remaining two bottles.
0.190 in. [4.82 mm]
Vacuum Bottles
Insulator
0.190 in. [4.82 mm]
Vacuum Bottles
Insulator
Figure 4.6 – Establishing Contact Gap
6. Install the load terminal retaining bolts at the rear of the contactor. Leave
the load terminal nuts loose for fine adjustment of the overtravel and
contact gap. Install the vacuum bottle mounting bolts at the top of the
contactor (reverse of step 2). Take care to ensure the threads are aligned as
cross-threading can occur. Hold the bottle to prevent it from turning while
torquing the vacuum bottle mounting bolts.