Figure 29 – Rockwell Automation 1502 Medium Voltage 400A Contactor - Series E User Manual
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Rockwell Automation Publication 1502-UM052H-EN-P - June 2013
Chapter 4
Maintenance
Figure 29 - 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.
7. Close the contactor by using the TEST control circuit in the starter. Insert
a feeler gauge of 0.065 in. (1.65 mm) into the overtravel gap of a bottle
assembly (
). Rotate the insulator until the gap is correctly set.
Repeat this step for the two remaining bottles. This step must be
performed accurately because it establishes synchronization between the
three vacuum bottles.
Figure 30 - Establishing Overtravel
8. With the contactor still energized, measure dimension A1 for all three
bottles (
). De-energize (drop out) the contactor and measure
dimension A2 for all three bottles. The contact gap is the difference of A2
minus A1. Record the gap for all three bottles.
0.190 in. [4.82 mm]
Vacuum Bottles
Insulator
Overtravel Gap
0.065 in. [1.65 mm]