F&F EPP-618 Manual page 5

Function F4
In this function, the relay operates in the so called "measuring
window".
The relay will be switched on if the current in the measuring cir-
cuit is higher than the Hi setpoint. The relay contacts will return
to their original position if the current drops below the setpoint
minus the hysteresis value. But the relay will also be switched on
if the current value is below the Lo setpoint.
In this case, the relay will be switched off if the current value in
the measuring circuit increases above the Lo setpoint plus the
hysteresis value.
The moment of switching on and off can be additionally adjusted
with the t or t time setting.
ON OFF
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