Mechanism NIII_Z_2: Check the General Condition of the Mechanism - MTZ Basic Standard Maintenance Procedures

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.

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.

Procedure Definition

Procedure characteristics	Description
Action	Check the general condition of the mechanism: Positioning of XF/MX/MN voltage releases on the fixing plate. Positioning of springs in the groove on the axle. Condition of springs.
Goal	Verify that the mechanism correctly opens and closes the device.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	–
Necessary tools	Torx screwdriver
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 - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - Maintenance 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

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	Open	Discharged	N/A
Drawout	Open	Discharged	Removed from chassis

Removing Front Cover

Step	Action	Corrective action
1	For MasterPacT MTZ1: Remove the spring charging handle. Insert a thin screwdriver under the bottom left-hand corner of the spring charging handle. Push the screwdriver to unclip the rubber cover of the spring charging handle. Slide the rubber cover to the top and remove it from the spring charging handle.
2	Remove the front cover of the device.

Step

Action

Corrective action

1

For MasterPacT MTZ1: Remove the spring charging handle.

Insert a thin screwdriver under the bottom left-hand corner of the spring charging handle.
Push the screwdriver to unclip the rubber cover of the spring charging handle.
Slide the rubber cover to the top and remove it from the spring charging handle.

2

Remove the front cover of the device.

Checking Cable Between the ULP Port Module and MicroLogic X Control Unit

If you have installed the ULP port module, follow the procedure described below:

Step	Action	Corrective action
1	Check that the wire is not damaged and is correctly positioned so that it does not interfere with the reset mechanism.	If the wire is damaged, replace it. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
2	Check the cable connection to the MicroLogic X control unit.	If the connection is loose, reinsert the cable, making sure that the connector is fully inserted.

Step

Action

Corrective action

1

Check that the wire is not damaged and is correctly positioned so that it does not interfere with the reset mechanism.

If the wire is damaged, replace it.

Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

2

Check the cable connection to the MicroLogic X control unit.

If the connection is loose, reinsert the cable, making sure that the connector is fully inserted.

Checking Mechanism

Step	Action	Corrective action
1	Remove the mechanism cover: For MasterPacT MTZ1: using a thin screwdriver, release the tab on the left-hand side that holds the mechanism cover in place (do not break or bend the tab) and then free the right-hand side. For MasterPacT MTZ2/MTZ3: unscrew the screw that holds the mechanism cover in place then pull off the front cover.	If the mechanism cover is damaged, contact your Schneider Electric Services representative.
2	Check the general condition of the mechanism: Sufficient grease. No dust.	If there is dust on the mechanism, or the consistency or color of the grease has changed, contact your Schneider Electric Services representative.
3	Check that the XF/MX/MN voltage releases are correctly positioned on the fixing plate.	If necessary, reposition the voltage releases (refer to MasterPacT MTZ - MN-MX-XF Voltage Releases - Instruction Sheet).
4	Check that the springs are present, in good condition, and correctly positioned in the groove on the axle. For MasterPacT MTZ1: A Opening latch B Pole opening springs C Connecting-rod springs D Closing latch For MasterPacT MTZ2/MTZ3: A Opening latch B Pole opening springs C Connecting-rod springs D Closing latch	If a spring is damaged or missing, contact your Schneider Electric Services representative.
5	Manually charge the mechanism.
6	Check that the springs are correctly positioned.	If a spring is not correctly positioned, carefully put it back into place. If the problem persists, contact your Schneider Electric Services representative.
7	Close the device.
8	Check that the springs are still correctly positioned.	If a spring is not correctly positioned, carefully put it back into place. If the problem persists, contact your Schneider Electric Services representative.
9	Check the number of operating cycles and compare it with the maximum allowed for the connecting-rod springs as indicated in MasterPacT MTZ - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - Maintenance Guide .	If the maximum number has been reached, contact your Schneider Electric Services representative.
10	Put the mechanism cover back in place.

Reinstalling the Front Cover

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION OR ARC FLASH Put the circuit breaker front cover back in place before energizing the circuit breaker to prevent access to live terminals. Do not pinch the wires with the front cover. Failure to follow these instructions will result in death or serious injury.

Step	Action	Corrective action
1	Put the front cover back in place.
2	For MasterPacT MTZ1: Put the rubber cover back in place on the spring charging handle.