4
Instruction Booklet
IB019013EN
Effective March 2019
Zone selective interlocking test kit
For Digitrip 520M, 520MC and 1150 trip units
EATON
www.eaton.com
11. Locate the correct breaker for the test you are performing and
remove the tamper resistant cover from the Digitrip unit if
needed. Plug the other end of the appropriate ZSI zone cable
into the Digitrip unit, applying even pressure to both ends of the
plug.
12. Repeat step 11 for the other two ZSI zone cables, making sure
they get plugged in to the correct zone.
13. Move the selector switch on the ZSI test box to the “ON” posi-
tion.
14. Navigate to the “Test Screen” on the display panel.
15. Select “Single” or “Double” (based on the switchgear configura-
tion being tested).
16. Select “Main Fault”, “Tie Fault”, or “Feeder Fault”.
17. Press the “Initiate Test” button to start the test.
18. After the test is completed, press the “Reset Test” button to
prepare the tester for the next test.
19. Select new parameters and perform the next test.
20. Remember to change which Digitrip units the ZSI zone cables
are plugged into when changing tests to ensure correct results.
21. Once testing is complete, return the trip unit settings to the
previous settings recorded on the worksheet.
