Device Locking NII_Z_1: Operate Device Keylocks

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 device with keylocks.
Goal	Verify the operation of keylocks with the optional VSPO OFF-position locking accessory.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	–
Necessary tools	–
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 - VCPO OFF-Position Locking and BPFE Support - Instruction Sheet MasterPacT MTZ2/MTZ3 - VCPO OFF-Position Locking and BPFE Support - 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	Closed	Discharged	N/A
Drawout	Open	Discharged	Disconnected

Checking Locking the Device in the Open Position

For devices with two keylocks, execute the following procedure for each keylock. Locking with one key is sufficient to lock the device in the open position.

Step	Action	Corrective action
1	With the key captive in the keylock, check that the device 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	Press the opening pushbutton to open the device.
3	For MasterPacT MTZ1: Press and hold down the opening pushbutton, and simultaneously turn the key counterclockwise. For MasterPacT MTZ2/MTZ3: Turn the key counterclockwise.	If the key does not turn, replace the keylock.
4	Remove the key and release the opening pushbutton. NOTE: For MasterPacT MTZ1, the pushbutton remains pushed-in.
5	Charge the mechanism to be able to give a closing order.
6	If the device is equipped with an MN undervoltage release, either connect it to the power supply with its rated voltage or remove the MN undervoltage release.
7	Press the closing pushbutton. The device must not close.	If the device closes, check that the lock support is correctly installed (refer to MasterPacT MTZ - VCPO OFF-Position Locking and BPFE Support - Instruction Sheet). Then do the procedure again. If the lock support is damaged, replace it. If the keylock is corroded, replace it. If the problem persists, contact your Schneider Electric Services representative.
8	If there is a second key, unlock the device and do the procedure with the second key.

Checking Device Unlocking

Before starting this check, verify that the device is locked in the open position.

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

Step	Action	Corrective action
1	Put the key in the keylock.
2	Turn the key clockwise and check that the key cannot be removed from the lock.	If the key does not turn or can be removed, replace the keylock. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Press the closing pushbutton to close the device. The device closes.	If the device does not close, check that the lock support is correctly installed (refer to MasterPacT MTZ - VCPO OFF-Position Locking and BPFE Support - Instruction Sheet). Then do the procedure again. If the lock support is damaged, replace it. If the keylock is corroded, replace it. If the problem persists, contact your Schneider Electric Services representative.
4	With the device closed, check that the key remains captive unless the opening pushbutton is pressed.