Auxiliaries NIII_Z_3: Check Opening Operation with MX Opening Voltage Release at 0.7 Un

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 characteristics	Description
Action	Check opening the device with the MX opening voltage release at 0.7 Un.
Goal	Verify that the device opens electrically at Umin.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	Connect the MX opening voltage release to an external power supply.
Necessary tools	Adjustable external power supply Voltmeter External pushbutton
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 MTZ1/MTZ2/MTZ3 - MN-MX-XF Voltage Releases - Instruction Sheet MasterPacT MTZ1/MTZ2/MTZ3 - MN-MX-XF Communicating Voltage Releases with Diagnostic Function - Instruction Sheet

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	Charged or discharged	N/A
Drawout	Closed	Charged or discharged	Test

		Standard MX opening voltage releases		Communicating MX opening voltage release

DANGER
HAZARD OF ELECTRIC SHOCK When using the adjustable external power supply, take all suitable measures to protect against electric shock. Failure to follow these instructions will result in death or serious injury.

Before starting this check, it is advisable to execute a few electrical opening and closing cycles as per procedure Mechanism NII_Z_1.

Step	Action	Corrective action
1	Disconnect supply wires on the customer terminal block.
2	Connect the adjustable external power supply and external pushbutton according to the corresponding wiring diagram above.
3	Set the external power supply voltage to 0.7 Un (Un = customer auxiliary voltage).
4	Press the external pushbutton to open the device. The device opens.	If the device does not open: Check that the power supply voltage is not below 0.7 Un and do the procedure again. If the device still does not open, replace the MX opening voltage release (refer to MasterPacT MTZ - MN-MX-XF Voltage Releases - Instruction Sheet). If the problem persists, contact your Schneider Electric Services representative.
5	Reconnect the customer terminal block according to the initial wiring.
6	Check that the device electrically opens according to procedure Mechanism NII_Z_1.