User manual 09/2009 - Schneider Electric

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User manual 09/2009 - Schneider Electric

Using Micrologic Trip UnitsKeypadThe 5-button keypad is used for navigation.KeyModeDescriptionSelecting the modeScrolling navigationNavigation back (metering) or - (setting the protection parameters)Navigation forward (metering) or + (setting the protection parameters)OKConfirmationMicrologic Trip Unit Power Supply• The Micrologic trip unit is powered with its own current in order to guarantee the protection functions.If there is no optional external 24 VDC power supply, the Micrologic trip unit only works when the circuitbreaker is closed. When the circuit breaker is open or the through current is low (15 to 50 A dependingon the rating), the Micrologic trip unit is no longer powered and its display switches off.• An external 24 VDC power supply for the Micrologic trip unit is optional for:• Modifying the setting values when the circuit breaker is open• Displaying measurements when there is a low current through the circuit breaker (15 to 50 Adepending on the rating) when the circuit breaker is closed• Continuing to display the reason for the trip and the breaking current when the circuit breaker isopenThe external 24 VDC power supply is available to the Micrologic trip unit once it has been connected toanother module in the ULP system (Modbus communication interface module, front display moduleFDM121 or maintenance module).When the Micrologic trip unit is not connected to a ULP module, it can be connected directly to an external24 V DC power supply with the help of the optional 24 VDC supply terminal block (reference LV434210).LV434104 09/2009 17

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