Chassis Locking NII_Z_1: Operate Chassis Keylocking System

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

Procedure characteristics	Description
Action	Check the locking and unlocking of the chassis with keylocks in the disconnected position or in any position, according to the chassis locking configuration.
Goal	Verify the chassis keylocking system with the optional VSPD chassis locking accessory correctly operates.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	–
Necessary tools	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 - VSPD Disconnected Position Locking - Instruction Sheet MasterPacT MTZ2/MTZ3 - VSPD Disconnected Position 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	Disconnected

Determining the Chassis Locking Configuration

The MasterPacT MTZ drawout devices offer two chassis locking possibilities with keylocks:

In the disconnected position.
In any position (disconnected, test, or connected).

To determine the chassis locking possibility, move the device to the connected or test position:

If you cannot pull out the padlocking tab, the chassis can be locked in the disconnected position only. Execute the locking procedure then the unlocking procedure.
If you can pull out the padlocking tab, the chassis can be locked in the disconnected, test, or connected position. The locking and unlocking procedures are the same as with chassis in the disconnected position. Execute these procedures in each position: connected, test, disconnected.

The following table shows the chassis locking configurations.

Chassis locking system	Device position in the chassis	Padlocking tab	Racking handle insertion with chassis locked
Chassis locking in the disconnected position	Connected	Cannot be pulled out	Possible
	Test	Cannot be pulled out	Possible
	Disconnected	Can be pulled out	Not possible
Chassis locking in any position	Connected	Can be pulled out	Not possible
	Test	Can be pulled out	Not possible
	Disconnected	Can be pulled out	Not possible

Checking Chassis Locking with Device in the Disconnected Position

For chassis with two keylocks, execute the following procedure for each keylock. Locking with one key is sufficient to lock racking operations.

Step	Action	Corrective action
1	With the key captive in the keylock, check that the chassis is not locked.	If the key is missing or broken, replace the keylock. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
2	Verify that the racking handle is not inserted in the racking handle socket.
3	Turn the key counterclockwise, and then remove it.	If the key does not turn, replace the keylock.
4	Check that the racking handle cannot be inserted into the racking handle socket.	If the racking handle can be inserted, check that the lock support is correctly installed (refer to MasterPacT MTZ - VSPD Disconnected Position Locking - Instruction Sheet). If the lock support is damaged, replace it. If the keylock is corroded, replace it. Then do the procedure again. If the problem persists, contact your Schneider Electric Services representative.
5	Unlock the chassis and remove the key. Then do the procedure with the second key, if any.

Checking Chassis Unlocking with Device in the Disconnected Position

Before starting this check, verify that the chassis is locked in the disconnected position.

For chassis with two keylocks, execute the following procedure for each keylock. Both keys must be inserted in the keylocks to unlock the chassis.

Step	Action	Corrective action
1	Put the key in the lock.
2	Turn the key clockwise and check that the key remains captive.	If the key does not turn, replace the keylock. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Check that the racking handle can be inserted into the racking handle socket so that racking operations can be carried out.	If the racking handle cannot be inserted, check that the lock support is correctly installed (refer to MasterPacT MTZ - VSPD Disconnected Position Locking - Instruction Sheet). If the lock support is damaged, replace it. If the keylock is corroded, replace it. Then do the procedure again. If the problem persists, contact your Schneider Electric Services representative.

Step

Action

Corrective action

Put the key in the lock.

Turn the key clockwise and check that the key remains captive.

If the key does not turn, replace the keylock.

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

Check that the racking handle can be inserted into the racking handle socket so that racking operations can be carried out.

If the racking handle cannot be inserted, check that the lock support is correctly installed (refer to MasterPacT MTZ - VSPD Disconnected Position Locking - Instruction Sheet).

If the lock support is damaged, replace it.

If the keylock is corroded, replace it.

Then do the procedure again.

If the problem persists, contact your Schneider Electric Services representative.