Description of the MicroLogic 5 and 6 Trip Units

Trip Unit Front Face

Use the display screen and keypad on the trip unit to set the trip unit options and check system measurements. Refer to the navigation principles for more information.

Front face of a MicroLogic 5.2 E trip unit for a 3-pole circuit breaker

A Indication LEDs

B Test port

C Dials for presetting protection functions and microswitch for locking protection setting

D LCD display

E Navigation keypad

Indication LEDs

Indication LEDs show the trip unit operational state.

Indication LEDs vary in meaning depending on the trip unit type.

Type of MicroLogic trip unit	Description
Distribution	Ready LED (green) blinks slowly when the standard protection functions of the electronic trip unit are operational. Overload pre-alarm LED (orange) lights when the load exceeds 90% of the Ir setting. Overload alarm LED (red) lights when the load exceeds 105% of the Ir setting.
Motor	Ready LED (green) blinks slowly when the standard protection functions of the electronic trip unit are operational. Overload temperature alarm LED (red) lights when the motor thermal image exceeds 95% of the Ir setting.

Test Port

@updated

MicroLogic trip units feature a test port specifically for maintenance actions.

Use the test port to:

Connect a pocket battery for local testing of the MicroLogic trip unit
Connect the Service Interface for testing, setting the MicroLogic trip unit, updating the MicroLogic firmware, or for installation diagnostics with EcoStruxure Power Commission software
Connect the USB maintenance interface:
- For push-to-trip test or installation diagnostics with the USB maintenance interface stand-alone
- For testing and installation diagnostics, setting the MicroLogic trip unit, updating the MicroLogic firmware with the USB maintenance interface connected to a PC

For more information, refer to DOCA0140EN ComPact NSX - Circuit Breakers and Switch-Disconnectors 100–630 A - User Guide.

Dials and Microswitch

The trip unit face has two dials for presetting protection functions and a microswitch for locking/unlocking the protection settings done with the keypad. For distribution trip units, the dials are for setting long-time and instantaneous protection.

A Long-time protection pickup (Ir) adjustment dial

B Short-time protection pickup (Isd) adjustment dial (MicroLogic 5 only)

C Ground-fault protection pickup (Ig) adjustment dial (MicroLogic 6 only)

D Microswitch for locking/unlocking the protection parameter settings

LCD Display

An LCD display provides information necessary to use the trip unit. The list of protection functions varies according to the MicroLogic trip unit type.

Item	Description
A	5 pictograms: : Metering : Readout : Protection : Setting : Lock The combination of pictograms defines the mode.
B	Up arrow points to protection function currently being set
C	List of protection functions according to the MicroLogic trip unit type: MicroLogic 5: MicroLogic 6: MicroLogic 6 E-M:
D	Value of the measured quantity
E	Unit of the measured quantity
F	Navigation arrows
G	Down arrows point to the selected phase(s), neutral, or ground
H	Phases (1/A, 2/B, 3/C), neutral (N) and ground

LCD Display Backlighting

When the MicroLogic trip unit is powered by an external 24 Vdc power supply, the trip unit display has white backlighting that is:

Low intensity continuously
High intensity for 1 minute after pressing one of the keys on the keypad

The display backlighting is:

Deactivated if the temperature exceeds 65 °C (149 °F).
Reactivated once the temperature drops back below 60 °C (140 °F).

On trip units powered by the pocket battery, the display unit is not backlit.

Navigation Keypad

Use the 5-key keypad for navigation.

Key	Description
	Selecting the mode
	Scrolling navigation
	Navigation back (metering) or - (setting the protection functions)
	Navigation forward (metering) or + (setting the protection functions)
	Confirmation