Description of the MicroLogic 7 Trip Unit with Integrated Earth-Leakage Protection

Presentation

The MicroLogic Vigi 7 electronic trip unit is available in two versions for earth-leakage detection:

The Trip version trips when earth-leakage is detected.
The Alarm version measures the earth-leakage current and indicates an earth-leakage fault on the display screen.

When the SDx indication contact is present, it signals an earth-leakage fault remotely.

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 Vigi 7 trip unit (Trip version):

A Indication LEDs

B Adjustment dials for presetting protection functions, microswitch for locking protection setting, and test button for testing earth-leakage protection

C LCD display screen

D Navigation keypad

E Test port

F Dielectric switch

Indication LEDs

Indication LEDs show the trip unit operational state.

A Ready LED (green) blinks slowly when the standard protection functions of the electronic trip unit are operational.

B Overload pre-alarm LED (orange) lights when the load exceeds 90% of the Ir setting.

C Overload alarm LED (red) lights when the load exceeds 105% of the Ir setting.

Dials, Microswitch, and Test Button

The trip unit face has two adjustment dials for presetting protection functions, a microswitch for locking/unlocking the protection settings, and a test button for testing the earth-leakage protection.

A Long-time protection pickup (Ir) adjustment dial

B Earth-leakage protection pickup (IΔn) adjustment dial

C Test button for testing earth-leakage protection

D Microswitch to lock/unlock the protection 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 for MicroLogic Vigi 7 trip unit:
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 the 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

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.

Dielectric Switch

The dielectric switch disconnects the trip unit power supply from the phases. It is used when performing a panel dielectric test.

For more information about how to use the dielectric switch, refer to DOCA0140EN ComPact NSX - Circuit Breakers and Switch-Disconnectors 100–630 A - User Guide.