U.6.15
Date Code 20090715 User’s Guide SEL-421 Relay
Testing and Troubleshooting
Test Methods
View Relay Elements With the Front-Panel LCD
You can use the front-panel display and navigation pushbuttons to check
Relay Word bit elements. See Section 5: Front-Panel Operations for more
information on using the relay front panel.
This procedure uses the 50P1 Phase Instantaneous Overcurrent element. Use
the factory defaults for the pickup level (Table 6.6). For more information on
the 50P elements, see Instantaneous Line Overcurrent Elements on
page R.1.64.
Step 1. Display the
MAIN MENU.
Step 1. If the relay LCD is in the
ROTATING DISPLAY, press the {ENT}
pushbutton to display the
MAIN MENU similar to that in
Figure 6.8.
Step 2. Press the {Down Arrow} navigation pushbutton to highlight the
RELAY ELEMENTS action item (see the first screen of Figure 6.8).
Step 3. Press the {ENT} pushbutton.
You will see a
RELAY ELEMENTS screen (the second screen of
Figure 6.8).
Courtesy of NationalSwitchgear.com
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