Chassis NIII_Z_2: Check Operation of Safety Shutters - 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 opening and closing of the safety shutters manually. Check the locking and unlocking of the safety shutters with the optional VIVC locking accessory (MasterPacT MTZ2/MTZ3).
Goal	Verify that the safety shutters operate correctly and prevent access to the power circuit when the device is removed from the chassis.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	–
Necessary tools	Padlock with shackle diameter 5–8 mm Racking handle
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 - Safety Shutters - Instruction Sheet MasterPacT MTZ2/MTZ3 - Safety Shutters - Instruction Sheet MasterPacT MTZ2/MTZ3 - VIVC Front Face Shutter Position Indication and Locking - 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	N/A	N/A	N/A
Drawout	Open	Discharged	Removed from chassis

Checking Safety Shutter Operation for MasterPacT MTZ1, MTZ2, and for MTZ3 Before 09/2022

Execute the following procedure for each safety shutter.

Step	Action	Corrective action
1	Press and hold the opening mechanism of the top safety shutter until the shutter opens completely.
2	Quickly release the mechanism. The top shutter must close completely.	If the shutter remains partially or completely open: Remove the shutter (refer to the relevant MasterPacT MTZ - Safety Shutters - Instruction Sheet). Remove the shutter actuator (MasterPacT MTZ2). Clean the shutter actuator and safety shutter to remove any grease or dust. Reinstall the shutter actuator (MasterPacT MTZ2). Reinstall the shutter. Do the procedure again. If the problem persists, replace: The safety shutter. The shutter actuator (MasterPacT MTZ2). Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Press and hold the opening mechanism of the bottom safety shutter until the shutter opens completely.
4	Quickly release the mechanism. The bottom shutter must close completely.	If the shutter remains partially or completely open, follow the corrective action described in step 2.
5	Repeat steps 1 to 4 of the procedure with a slow release of the mechanism until it has returned to its initial position. The slow release simulates the slow translation of the device during disconnection. Each shutter must close completely.	If a shutter remains partially or completely open, follow the corrective action described in step 2.

Checking Safety Shutter Operation for MasterPacT MTZ3 After 09/2022

From 09/2022, each MTZ3 safety shutter protects the top and bottom chassis clusters of one phase. Prior to this date, one safety shutter protected the top chassis clusters of all phases, and one safety shutter protected the bottom chassis clusters of all phases.

Execute the following procedure for the safety shutter mechanism of each phase.

Step	Action	Corrective action
1	Press and hold the opening mechanism of the safety shutters of one phase until the top and bottom shutters open completely.
2	Quickly release the mechanism. The top and bottom shutters must close completely.	If a shutter remains partially or completely open: Remove the shutter (refer to the relevant MasterPacT MTZ - Safety Shutters - Instruction Sheet). Remove the shutter actuator. Clean the shutter actuator and safety shutter to remove any grease or dust. Reinstall the shutter actuator. Reinstall the shutter. Do the procedure again. If the problem persists, replace: The safety shutter. The shutter actuator. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Press and hold the same opening mechanism again until the safety shutters open completely.
4	Slowly release pressure until the mechanism has returned to initial position. The slow release simulates the slow translation of the device during disconnection. The top and bottom shutters must close completely.	If a shutter remains partially or completely open, follow the corrective action described in step 2.
5	Repeat the procedure for the shutter mechanism of each phase.

Checking Shutter Padlocking with the VIVC Locking Accessory for MasterPacT MTZ2, and for MTZ3 Before 09/2022

Before starting this check, verify that the VIVC front face shutter position indication and locking accessory is mounted.

The top or bottom safety shutters can be locked individually or together on MasterPacT MTZ2 devices and on MasterPacT MTZ3 devices manufactured before 09/2022.

Safety shutter locking is only possible with the chassis in test or disconnected position.

Step	Action	Corrective action
1	Pull out the right-hand tab.	If the tab cannot be pulled out, check that the locking accessory is correctly installed (refer to MasterPacT MTZ2/MTZ3 - VIVC Front Face Shutter Position Indication and Locking - Instruction Sheet). If the locking accessory is damaged, replace it. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts. If the problem persists, contact your Schneider Electric Services representative.
2	Insert the padlock in this tab.
3	Check that it is not possible to press the shutter actuator of the bottom safety shutter. The bottom safety shutter must remain closed.	If the shutter actuator can be pressed and/or the safety shutter can be opened, remove and replace the shutter. If the problem persists, contact your Schneider Electric Services representative.
4	Check that the racking handle cannot be inserted.	If the racking handle can be inserted, contact your Schneider Electric Services representative
5	Remove the padlock.
6	Pull out the left-hand tab.
7	Insert the padlock in this tab.
8	Check that it is not possible to press the shutter actuator of the top safety shutter. The top safety shutter must remain closed.	If the shutter actuator can be pressed and/or the safety shutter can be opened, remove and replace the shutter. If the problem persists, contact your Schneider Electric Services representative.
9	Check that the racking handle cannot be inserted.	If the racking handle can be inserted, contact your Schneider Electric Services representative
10	Remove the padlock.

Checking Shutter Padlocking with the VIVC Locking Accessory for MasterPacT MTZ3 After 09/2022

Before starting this check, verify that the VIVC front face shutter position indication and locking accessory is mounted.

The VIVC locking accessory locks all safety shutters together on MasterPacT MTZ3 devices manufactured after 09/2022.

Safety shutter locking is only possible with the chassis in test or disconnected position.

Step	Action	Corrective action
1	Pull out the tabs.	If the tab cannot be pulled out, check that the locking accessory is correctly installed (refer to MasterPacT MTZ2/MTZ3 - VIVC Front Face Shutter Position Indication and Locking - Instruction Sheet). If the locking accessory is damaged, replace it. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts. If the problem persists, contact your Schneider Electric Services representative.
2	Insert the padlock in the tabs.
3	Check that it is not possible to press the shutter actuators of the safety shutter. The safety shutters must remain closed.	If a shutter actuator can be pressed and/or the safety shutters can be opened, remove and replace the shutter. If the problem persists, contact your Schneider Electric Services representative.
4	Check that the racking handle cannot be inserted.	If the racking handle can be inserted, contact your Schneider Electric Services representative
5	Remove the padlock.