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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 wind-
ing 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 functions. Test mode is indi-
cated 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 function are configured to the corresponding
binary inputs and outputs of the tested terminal.
Chapter 13
Verifying settings by secondary
injection
103
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