Relay Element Detection Before Trip [Pick Up] - Mitsubishi Electric MELPRO S Series Operation Manual

4.4. Relay Element Detection before Trip [PICK UP]

The count up status of the relay element is indicated by "PICK UP" function.
This count up status means 2 conditions.
 First, it shows the condition from the detection to tripping.
 Second, it shows the condition after tripping.
In the condition before relay trip besides after fault detection, 7-seg LED shows the count up condition by
figure from 1 to 10. When this count up reaches to 10, the protection relay trips and digital output (DO) is
closed. After relay tripping, 7-seg LED indicates "U" in this "PICK UP" function.
If instantaneous operation element, you would be difficult to read out the count up figures because count up
condition is completed immediately.
Turn Switch-1 to "PICK UP"
(position 4).
In the condition before relay
trip besides after fault
detection, 7-seg LED shows
the count up condition by
figure from 1 to 10.
Under the count up condition,
the "OPERATION
INDICATION" LED of the
detecting element is blinking.
As an example, this figure
shows the undervoltage
element is detecting.
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