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2.3
2.4
Preparing for test
Warning!
Never disconnect a secondary connection of current transformer circuit without short-
circuiting the transformer's secondary winding. Operating a current transformer with
the secondary winding open will cause a massive potential build-up that may damage
the transformer and may cause injuries to humans.
Setting the terminal in test mode
The terminal can be set in test mode before test. This means that all included functions
can be blocked or released as decided during the test. In this way, it is possible to test
slower back-up measuring functions without the interference of faster measuring func-
tions. Test mode is indicated when the yellow LED is flashing.
Procedure
1.
Browse to the 'Operation' menu and press 'E'.
The Operation menu is located in the local HMI under:
Test/TestMode/Operation
2.
Choose 'On' and press 'E'.
3.
Press 'C' twice to exit the menu.
The dialog 'Save testGroup?' appears.
4.
Choose 'Yes' and leave the menu.
The window repeatedly displays 'Busy' and after that the yellow
LED starts flashing which indicates that the terminal is in test
mode.
Connecting test equipment to the terminal
Before testing, connect the testing equipment according to the valid terminal diagram
for each specific REx 5xx terminal. Pay special attention to the correct connection of
the input and output current terminals, and to the connection of the residual current.
Check that the input and output logical signals in the logic diagram for the tested func-
tion are configured to the corresponding binary inputs and outputs of the tested termi-
nal.
Chapter 10
Verifying settings by secondary
injection
55
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