Masterpact MTZ1 Locking Actions

Locking the Masterpact MTZ1 Pushbuttons

The pushbutton locking cover is an optional accessory for the Masterpact MTZ1 device that prevents access to the closing and opening pushbuttons:

Together or separately.
By using a padlock (shackle diameter 5–8 mm [3/16–5/16 in.]).
By using a lead seal.
By using screws.

Masterpact MTZ1 Pushbutton Locking Accessory (VBP)

The pushbutton locking accessory is an optional transparent cover, mounted on the front cover of the device, which covers the closing and opening pushbuttons.

For information on the accessory installation, consult instruction sheet NVE56769, available on the Schneider Electric website.

Masterpact MTZ1 Device with the VBP Pushbutton

Step	Action
1	Close the transparent covers of the locking accessory. NOTE: One or both transparent covers of the locking accessory can be closed and locked.
2	Lock the transparent covers in place by using a padlock, lead seal, or screws.	Padlock
		Wire Seal
		Screws

Locking the Masterpact MTZ1 Device Open with Padlocks

Locking the Masterpact MTZ1 Device with VCPO Open

Step	Action
1	Press and hold down the opening pushbutton.
2	With the opening button pressed, pull out the tab of the off-position locking accessory.
3	Insert the padlock in the tab and close the padlock. Release the opening pushbutton.

Step

Action

Press and hold down the opening pushbutton.

With the opening button pressed, pull out the tab of the off-position locking accessory.

Insert the padlock in the tab and close the padlock.

Release the opening pushbutton.

Unlocking the Masterpact MTZ1 Device with VCPO

Step	Action
1	Remove the padlock.
2	The tab of the OFF-position locking accessory retracts.
3	Press the closing pushbutton to close the device.

Locking the Masterpact MTZ1 Device Open with Keylocks

Optional keylocks can be used:

To lock one Masterpact MTZ1 in the open position. When locked the device cannot be closed either locally with the closing pushbutton or remotely.
To interlock several Masterpact MTZ devices locked with the same key.

To use keylocks to lock the device in the open position, an optional OFF-position locking accessory is necessary.

Keylocks cannot be used if padlocks are used.

Masterpact MTZ1 Open-Position Locking Accessory (VSPO)

The OFF-position keylocking accessory is an optional accessory that is mounted on the front of the device. It can be fitted with one keylock.

The following types of keylocks can be fitted:

Ronis keylock	Profalux keylock	Castell keylock	Kirk keylock

For information on the accessory installation, consult the instruction sheet on the Schneider Electric website: NVE56770.

Locking the Masterpact MTZ1 Device with VSPO Open

For devices equipped with two keylocks, locking with one key is sufficient to lock the device in the open position.

Step	Action
1	Press and hold the opening pushbutton.
2	With the opening pushbutton pressed, turn the key counterclockwise to lock the device.
3	Remove the key.
3	Release the opening pushbutton.
5	Check that the device is locked in the open position and cannot be closed either locally with the closing pushbutton or remotely.

Unlocking the Masterpact MTZ1 Locked Open with VSPO

For devices equipped with two keylocks, locking with one key is sufficient to lock the device in the open position.

Step	Action
1	Put the key in the keylock.
2	Turn the key clockwise to unlock the device.
3	Press the closing pushbutton to close the device. NOTE: The key remains captive in the keylock.

Locking the Masterpact MTZ1 Cradle in the Disconnected Position

The cradle can be locked in the disconnected position. When the cradle is locked in the disconnected position, the racking handle cannot be inserted.

The cradle can be locked in the disconnected position:

By up to three padlocks with shackle diameter 5–8 m (3/16–5/16 in.).
By optional keylocks.

Keylocks can be used in addition to padlocks.

Cradle locking by padlock is always possible and does not require any accessory.

Locking the Masterpact MTZ1 Cradle with VSPD

A cradle locking by keylock accessory can be fitted with either:

One keylock.
Two keylocks with identical keys or different keys.

The following types of keylocks can be fitted:

Ronis keylock	Profalux keylock	Castell keylock	Kirk keylock

For information on the accessory installation, consult instruction sheet NVE56768, available on the Schneider Electric website.

Locking the Masterpact MTZ1 with Padlocks

Step	Action
1	Check that the cradle indicator is in the disconnected position.
2	Pull out the padlocking tab.
3	Insert the padlock(s) in the tab and close the padlock(s).
4	Press and hold down the opening pushbutton, then check that the racking handle cannot be inserted into the racking handle socket.

Unlocking Padlocked Masterpact MTZ1 Cradle

Step	Action
1	Remove the padlock. The tab retracts.
2	Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket.

Step

Action

Remove the padlock.

The tab retracts.

Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket.

Locking Masterpact MTZ1 Cradle with Keylocks

For a cradle equipped with two keylocks, locking with one key is sufficient to lock the cradle in the disconnected position.

Step	Action
1	Check that the cradle indicator is in the disconnected position.
2	Turn the key counterclockwise to lock the cradle.
3	Remove the key.
4	Press and hold down the opening pushbutton, then check that the racking handle cannot be inserted into the racking handle socket.

Unlocking Keylocked Masterpact MTZ1 Cradle

For a cradle equipped with two keylocks, both keys must be inserted in the keylocks to unlock the cradle.

Step	Action
1	Put the key in the lock.
2	Turn the key clockwise to unlock the cradle
2	NOTE: The key remains captive in the keylock.
3	Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket.

Locking the Masterpact MTZ1 Cradle in Any Position

The cradle can be locked in any position (connected, test, or disconnected position).

This locking function requires a mechanical adaptation of the cradle, explained in the following procedure.

When the cradle is locked, the racking handle cannot be inserted in the racking handle socket.

Masterpact MTZ1 Cradle Locking with VSPD Keylock Accessory

The cradle locking by keylock accessory and the locking and unlocking procedures are the same as for cradle locking in disconnected position (see Locking the Masterpact MTZ1 Cradle in the Disconnected Position).

Converting the Masterpact MTZ1 Cradle for Keylocking

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.

NOTICE
HAZARD OF EQUIPMENT DAMAGE The cradle must be securely fastened when installing or removing the device. Failure to follow these instructions can result in equipment damage.

Follow these stages to adapt the cradle locking mechanism so that the cradle can be locked in any position.

Step	Action
1	Removing the terminal block identification plate and the cradle front cover. (Refer to the following procedure).
2	Changing the position of the lock (see page 79).
3	Reinstalling the cradle front cover and the terminal block identification plate (see page 81).

Removing the Terminal Block Identification Plate and Cradle Front Cover

Before starting the procedure, check that the device is in the disconnected position (see Masterpact MTZ1 Disconnection) and remove the device from the cradle (see Masterpact MTZ1 Removal from Cradle).

Step	Action
1	Remove the two screws holding the terminal block identification plate in place, by using a PZ2 screwdriver.
2	Carefully pull out the terminal block identification plate.
3	Remove the two screws holding the cradle front cover in place, by using a PZ2 screwdriver.
4	Pull off the cradle front cover.

Changing the Position of the Masterpact MTZ1 Lock

Step	Action
1	Identify the position of the plastic cover of the lock.
2	Lift the plastic cover of the lock and hold it up.
3	Remove the two screws holding the lock in place, by using a PZ2 screwdriver.
4	Remove the lock.
5	Rotate the lock through 180° to change from locking in disconnected position (A) to locking in any position (B).
6	Use your finger to press down the tab behind the lock slot.
7	Insert the lock, making sure that the notch is on the left side.
8	Screw the lock into position with the two screws, using a PZ2 screwdriver. Release the plastic cover to allow it to drop back into place.

Reinstalling the MTZ1 Cradle Front Cover and Terminal Block Identification Plate

Step	Action
1	Reinstall the cradle front cover.
2	Screw the front cover into position with the two screws, by using a PZ2 screwdriver.
3	Slide the terminal block identification plate into place.
4	Screw the terminal block identification plate in with the two screws, using a PZ2 screwdriver.