Rockwell Automation 1502 Medium Voltage 400A Contactor - Series E - Manual (Page 15)

Rockwell Automation Publication 1502-UM052H-EN-P - June 2013 15
Receiving and Handling Chapter 2
1. Clean the outside of the vacuum bottles with a non-linting cloth or
industrial wipe before performing the test.
2. The contactor may be tested while it is in the power cell. The line
connection of the contactor must be disconnected and the ground lead
from the Hi-pot tester must be connected to the load side of the contactor.
Any fuses in the top of the contactor must be removed.
3. With the contactor in the open position, connect the test leads to the
contactor power terminals as shown in Figure 6 . It is recommended that an
AC Hi-pot tester be used. Apply 16 kV for 60 seconds and monitor the
leakage current. It should not exceed 5 mA. Test each vacuum bottle
individually.
4. If no breakdown occurs, the vacuum bottle is in an acceptable condition. If
a breakdown occurs, repeat the test once more. If the vacuum bottle fails a
second time, it must be replaced. If no breakdown occurs in the second
test, the vacuum bottle is in an acceptable condition.
5. After the high potential voltage is removed from the vacuum bottles, the
metal end caps of the vacuum bottles should be discharged with a
grounding rod to remove any residual electrical charge.
Figure 6 - Vacuum Bottle Integrity Test Circuit
The allowable leakage current value of 5 mA is exclusive of leakage due to test
equipment leads. The test setup leakage can be determined by running the
dielectric test with test leads not connected to the contactor and noting the
maximum leakage current. If this value is more than 2 mA, it should be added to
the 5 mA limit when testing the vacuum bottles.
ATTENTION: If one vacuum bottle fails, Rockwell Automation recommends the
replacement of all three vacuum bottles, if the unit has been in service.
Vacuum
Checker
Vacuum Contactor
in open position