Control Unit NII_Z_2: Check Ground-Fault (MicroLogic 6.0 X) or Earth-Leakage (MicroLogic 7.0 X) Protection Function

Safety Instructions

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM 029-STPS, or local equivalent. This equipment must only be installed and serviced by qualified electrical personnel. Unless specified otherwise in the maintenance procedures, all operations (inspection, test, and preventive maintenance) must be carried out with the device, the chassis, and the auxiliary circuits de-energized. Check that the device and the chassis are de-energized on the upstream and downstream terminals. Always use a properly rated voltage sensing device to confirm that the device, the chassis, and the auxiliary circuits are de-energized. Install safety barriers and display a danger sign. During the tests, it is strictly forbidden for anyone to touch the device, the chassis, or the conductors while voltage is applied. Before turning on power to this equipment, check that all connections are made with the correct tightening torque and the device is open (OFF position). Before turning on power to this equipment, put all devices, doors, and covers back in place. Before turning on power to this equipment, beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment. Failure to follow these instructions will result in death or serious injury.

DANGER

HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH

Apply appropriate personal protective equipment (PPE) and follow safe electrical work practices. See NFPA 70E, CSA Z462, NOM 029-STPS, or local equivalent.
This equipment must only be installed and serviced by qualified electrical personnel.
Unless specified otherwise in the maintenance procedures, all operations (inspection, test, and preventive maintenance) must be carried out with the device, the chassis, and the auxiliary circuits de-energized.
Check that the device and the chassis are de-energized on the upstream and downstream terminals.
Always use a properly rated voltage sensing device to confirm that the device, the chassis, and the auxiliary circuits are de-energized.
Install safety barriers and display a danger sign.
During the tests, it is strictly forbidden for anyone to touch the device, the chassis, or the conductors while voltage is applied.
Before turning on power to this equipment, check that all connections are made with the correct tightening torque and the device is open (OFF position).
Before turning on power to this equipment, put all devices, doors, and covers back in place.
Before turning on power to this equipment, beware of potential hazards and carefully inspect the work area for tools and objects that may have been left inside the equipment.

Failure to follow these instructions will result in death or serious injury.

Procedure Definition

This procedure is valid for circuit breakers equipped with a MicroLogic 6.0 X or MicroLogic 7.0 X control unit.

Procedure characteristics	Description
Action	Check that the device trips on ground-fault (MicroLogic 6.0 X) or earth-leakage (MicroLogic 7.0 X) by using the test button on the control unit.
Goal	Verify that the ground-fault or earth-leakage protection functions operate.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	Connect the MicroLogic X control unit to a power supply. For example, connect the Mobile Power Pack external battery to the MicroLogic USB port.
Necessary tools	–
Related documents	MasterPacT MTZ1 - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - User Guide MasterPacT MTZ2/MTZ3 - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - User Guide MasterPacT MTZ - MicroLogic X Control Unit - User Guide

Preliminary Conditions

The device must comply with the conditions specified below. Refer to the MasterPacT MTZ User Guides to find instructions for operating the device.

Device installation type	Position of poles	Mechanism	Device position in the chassis
Fixed	Closed	Discharged	N/A
Drawout	Closed	Discharged	Test

Checking MicroLogic X Control Unit Trip Cause LED

Step	Action	Corrective action
1	If the device is equipped with an MN undervoltage release, either connect it to the power supply with its rated voltage or remove the MN undervoltage release.
2	To open the transparent cover, pull its upper right-hand side corner.
3	Use a thin screwdriver to briefly push-in (<1 s) the test button, and then check that the Ig/IΔn LED is on and the screen display turns to red with the corresponding message.	If the Ig/IΔn LED does not light up, contact your Schneider Electric Services representative.
4	Check that the device trips and that the blue fault-trip reset button on the front cover pops out.	If the blue fault-trip reset button does not pop out, contact your Schneider Electric Services representative. If the device does not trip: Check that the device is closed. Check that the blue fault-trip reset button is pushed-in. Refer to troubleshooting in the appendix. Do the procedure again. If the problem persists, contact your Schneider Electric Services representative.
5	Press and hold the Test/Reset button for 3 seconds to reset the trip cause LEDs.
6	Manually charge the mechanism by pulling the spring charging handle down six times. When the spring charging handle no longer resists, the mechanism is charged.
7	If the device is equipped with an MN undervoltage release, either connect it to the power supply with its rated voltage or remove the MN undervoltage release.
8	Press the closing pushbutton. The device must not close.	If the device closes, check with customer order form: With RAR automatic reset option ordered by customer: operation is normal. Without RAR automatic reset option ordered by customer: contact your Schneider Electric Services representative.
9	Press the blue fault-trip reset button on the front cover to reset.	If the blue fault-trip reset button does not reset, contact your Schneider Electric Services representative.
10	Press the closing pushbutton. The device closes.	If the device does not close, refer to troubleshooting in the appendix. If the problem persists, contact your Schneider Electric Services representative.