Preliminary Operations for MasterPacT MTZ2/MTZ3 Device

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. Manufacturer maintenance and repair activities must be conducted only by accredited Schneider Electric Services representatives or accredited Schneider Electric certified partners. Accreditation requires attending Manufacturer training at one of the Schneider Electric training centers. 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.
Manufacturer maintenance and repair activities must be conducted only by accredited Schneider Electric Services representatives or accredited Schneider Electric certified partners. Accreditation requires attending Manufacturer training at one of the Schneider Electric training centers.
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

Procedure characteristics	Description
Action	Carry out preliminary operations before replacing the MicroLogic Active control unit in a MasterPacT MTZ2/MTZ3 device.
Goal	Put the MasterPacT MTZ2/MTZ3 device in a safe environment before working on it.
Necessary tools	PZ3 screwdriver
Reference documents	DOCA0285•• MasterPacT MTZ2/MTZ3 IEC Circuit Breakers with MicroLogic Active Control Unit - User Guide

Preliminary Operations for Fixed MasterPacT MTZ2/MTZ3 Devices

Before working on the equipment, always manually open the circuit breaker by pressing the opening pushbutton. This helps to prevent the circuit breaker from opening automatically when you remove the MicroLogic Active control unit with the circuit breaker closed.

Step	Action
1	Turn off all power supplying the equipment before working on or inside the equipment.
2	Use a properly rated voltage sensing device to confirm that power is off.
3	Press the opening pushbutton to open the device.
4	Check that the position indicators show that the device is OFF and that the mechanism is discharged.
5	Remove the front cover of the device.

Preliminary Operations for Drawout MasterPacT MTZ2/MTZ3 Devices

DANGER
HAZARD OF DEVICE FALLING Be sure that lifting equipment has lifting capacity for the device being lifted. Follow manufacturer’s instructions for use of lifting equipment. Wear hard hat, safety shoes, and heavy gloves. Failure to follow these instructions will result in death or serious injury.

Step	Action
1	Turn off all power supplying the equipment before working on or inside the equipment.
2	Use a properly rated voltage sensing device to confirm that power is off.
3	Press the opening pushbutton to open the device.
4	Check that the position indicators show that the device is OFF and that the mechanism is discharged.
5	Rack out the device and check that it is in the disconnected position.
6	Remove the device from the chassis.
7	Remove the front cover of the device.