ABB REL 551 2.3 Series - Preparing for Test

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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.
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The Operation menu is located in the local HMI under:
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The dialog ‘Save testGroup?’ appears.
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The window repeatedly displays ‘Busy’ and after that the yellow
LED starts flashing which indicates that the terminal is in test
mode.
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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.
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