5
Instruction Leaflet
IL01301051E
effective September 2013
Operating Manual for Series NRX
Trip Units - Digitrip™ 520/520M
EATON
www.eaton.com
List of Figures
page
List of Tables
page
Figure 1. Example Digitrip 520M LSIG with legend . . . . . . . . . . . . 7
Figure 2. Digitrip Nameplates . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 3. Installation of the Trip Unit into Frame Module
of a Series NRX Circuit Breaker . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 4. Installation of the Rating Plug into the Trip Unit . . . . . . . 11
Figure 5. Block Diagram with Breaker Interface . . . . . . . . . . . . . . 13
Figure 6. Applying Long Delay Settings . . . . . . . . . . . . . . . . . . . . 15
Figure 7. Long Delay Current Settings . . . . . . . . . . . . . . . . . . . . . . 15
Figure 8. Long Delay Time Settings . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 9. Long Time Memory (LTM) Jumper . . . . . . . . . . . . . . . . . 15
Figure 10. Applying Short Delay Settings . . . . . . . . . . . . . . . . . . . 16
Figure 11. Short Delay Current Settings . . . . . . . . . . . . . . . . . . . . 16
Figure 12. Short Delay Time Settings . . . . . . . . . . . . . . . . . . . . . . 16
Figure 13. Applying Instantaneous Settings . . . . . . . . . . . . . . . . . 16
Figure 14. Instantaneous Settings . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 15. Applying Ground Fault Settings . . . . . . . . . . . . . . . . . . 17
Figure 16. Ground Fault Current Settings . . . . . . . . . . . . . . . . . . . 17
Figure 17. Ground Fault Time Settings . . . . . . . . . . . . . . . . . . . . . . 17
Figure 18. Sensor Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 19. Functional Test Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 20. Digitrip Battery Installation . . . . . . . . . . . . . . . . . . . . . . 22
Figure 21. Digitrip 520M in Maintenance Mode . . . . . . . . . . . . . . 25
Figure 22. Communication Module . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 23. Curve Select . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Figure 24. Typical Zone Interlocking . . . . . . . . . . . . . . . . . . . . . . . . 27
Figure 25. Typical Zone Interlocking Connections with two
Main Circuit Breakers (M1, M2) and a Tie Circuit Breaker (T) . . . . 28
Figure 26. Connection Details for Conducting Single-Pole,
Single-Phase Current Tests With the Circuit Breaker
Removed From the Cell . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 27. Connection Details for Conducting Single-Phase Current
Tests With the Circuit Breaker Removed From the Cell . . . . . . . . 32
Figure 28. Typical Trip Function Record Nameplate . . . . . . . . . . . . 33
Figure 29. Automatic Trip Operation Record . . . . . . . . . . . . . . . . . 33
Figure 30. Typical Performance Test Record Form . . . . . . . . . . . . . 34
Figure 31. Series NRX-NF frame (IZMX16/IZM91) breaker master
connection diagram drawing number 6D32389 . . . . . . . . . . . . . . 35
Figure 32. Series NRX-NF frame (IZMX16/IZM91) breaker master
connection diagram drawing number 6D32389 . . . . . . . . . . . . . . 36
Figure 33. Series NRX-RF frame (IZMX40/IZM95) breaker master
connection diagram drawing number 6D32424 . . . . . . . . . . . . . . 37
Figure 34. Series NRX-RF frame (IZMX40/IZM95) master connection
diagram drawing number 6D32424 . . . . . . . . . . . . . . . . . . . . . . . . 38
Table 1. Catalog Number References . . . . . . . . . . . . . . . . . . . . . . . 6
Table 2. Legend for Figure 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Available Digitrip 520 and 520M Trip Units . . . . . . . . . . . . 8
Table 4. Technical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 5. Series NRX/Digitrip Ground Fault Sensing Modes . . . . . 18
Table 6. Ground (Earth) Fault Current Settings Source
Ground/Zero Ground Fault Settings . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 7. Ground (Earth) Fault Current Setting - Residual
NF Frame (IZMX16/IZM91) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 8. Ground (Earth) Fault Current Setting - Residual
RF Frame (IZMX40/IZM95) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 9. NRX Type NF Frame Rating Plugs . . . . . . . . . . . . . . . . . . 23
Table 10. NRX Type RF Frame Rating Plugs . . . . . . . . . . . . . . . . . 24
