Rockwell Automation 1502 400 Amp Medium Voltage Contactor (Series D) - Manual (Page 15)

Receiving and Handling 2-3
1502-UM050D-EN-P – June 2013
High-potential test instruments can be purchased to perform the vacuum bottle
integrity test. A Megger cannot be used to measure vacuum integrity because
the voltage is too low. One of the following AC Hi-pot testers is recommended
as a test instrument.
MANUFACTURER ADDRESS
Mitsubishi Type VI #4U17 Chicago, Ill., USA
Jennings Model JHP-70A San Jose, CA., USA
Hipotronics Model 7BT 60A Brewster, NY, USA
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 2.1. It is recommended that
an AC Hi-pot tester be used. Use the test voltage indicated in Table 2.A.
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.
If one vacuum bottle fails, Rockwell Automation recommends
the replacement of all three vacuum bottles, if the unit has
been in service.
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.
I M P O R T A N T I M P O R T A N T