Masterpact MTZ1 Interlocking Actions
An interlocking action is an automatic locking operation provided by interlocking accessories added to the Masterpact MTZ1 device or cradle.
A number of optional interlocking accessories are available for the Masterpact MTZ1 device and cradle. For a complete listing of available interlocks, refer to Masterpact MTZ Circuit Breakers and Switches – Catalog (0614CT1701), available on the Scheider Electric website.
For detailed installation instructions on field-installable interlocks, refer to the installation instructions shipped with these accessories.
Masterpact MTZ1 Cradle Rejection Feature
The cradle rejection feature allows the installation of a Masterpact MTZ1 device only in a cradle with compatible characteristics.
Cradle rejection pins offer over 100 different combinations that can be selected so that a device can only be mounted on a cradle with the matching combination.
Masterpact MTZ1 Cradle Rejection
The use of cradle rejection pins is optional. One cradle rejection accessory is required for each device.
For information on the accessory installation, consult instruction sheet NVE35465, available on the Schneider Electric website.
Masterpact MTZ1 Cradle Rejection Pin Locations
The following illustration shows the pin location on the cradle and device, respectively.
The pin combination selected on the cradle must correspond to the pin combination selected on the device (see following table). For example, the combination ABC on the cradle corresponds to the combination 45 on the device.
Pins on the cradle are labeled 1, 2, 3, 4, 5.
Pins on the device are labeled A, B, C, D, E.
Masterpact MTZ1 Cradle Rejection Recommended Pin Combinations
The following are the recommended pin combinations:
|
Pins on Cradle |
Pins on Device |
Pins on Cradle |
Pins on Device |
|---|---|---|---|
|
45 |
ABC |
15 |
BCD |
|
35 |
ABD |
14 |
BCE |
|
34 |
ABE |
145 |
BC |
|
345 |
AB |
13 |
BDE |
|
25 |
ACD |
135 |
BD |
|
24 |
ACE |
134 |
BE |
|
245 |
AC |
12 |
CDE |
|
23 |
ADE |
125 |
CD |
|
235 |
AD |
124 |
CE |
|
234 |
AE |
123 |
DE |
Masterpact MTZ1 Door Interlock (VPEC)
With the door interlock:
-
The equipment door is locked and cannot be opened when the drawout device is in the connected or test position.
-
The equipment door can be opened when the drawout device is in the disconnected position.
-
The equipment door can be closed with the drawout device in any position.
Door Interlock Accessory (VPEC)
The door interlock accessory (VPEC) is an optional accessory that is mounted on the left side or on the right side of the cradle. One door interlock is necessary for one cradle.
For information on the accessory installation, consult instruction sheet NVE35519, available on the Schneider Electric website.
Using Masterpact MTZ1 VPEC Accessory to Lock Equipment Door
|
Step |
Action |
|
|---|---|---|
|
1 |
Close the equipment door. |
|
|
2 |
Put the device into the test or connected position (see Masterpact MTZ1 Connection). |
|
|
3 |
Check that the equipment door is locked. |
|
Unlocking Equipment Door Locked with a Masterpact MTZ1 VPEC Accessory
|
Step |
Action |
|
|---|---|---|
|
1 |
Put the device into the disconnected position (see Masterpact MTZ1 Disconnection). |
|
|
2 |
Check that the equipment door is unlocked. |
|
Masterpact MTZ1 Open-Door Racking Interlock (VPOC)
With the racking interlock installed, a drawout Masterpact MTZ1 device cannot be racked in or out when the equipment door is open because the racking handle cannot be inserted.
Open-Door Racking Interlock (VPOC)
The optional VPOC racking interlock can be installed on the right side of the cradle.
For information on the accessory installation, consult instruction sheet NVE35520, available on the Schneider Electric website.
Activating the VPOC Racking Interlock
|
Step |
Action |
|
|---|---|---|
|
1 |
Insert the racking interlock. |
|
|
2 |
Press and hold down the opening pushbutton, then check that the racking handle cannot be inserted into the racking handle socket when the equipment door is open. |
|
|
3 |
Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket when the equipment door is closed. |
|
Deactivating the VPOC Racking Interlock
|
Step |
Action |
|
|---|---|---|
|
1 |
Pull out the racking interlock. |
|
|
2 |
Press and hold down the opening pushbutton, then check that the racking handle can be inserted into the racking handle socket when the equipment door is open or closed. |
|
Masterpact MTZ1 Cable-Type Door Interlock (IPA)
When the cable-type door interlock is installed, the door cannot be opened when the device is closed and the device cannot be closed when the door is open.
The cable-type door interlock comprises a plate, a lock, and a cable. It is mounted on the right-hand side of the device.
When the interlock is installed, the mechanical interlock for transfer switches cannot be implemented.
Masterpact MTZ1 Cable-Type Door Interlock (IPA) Description
The cable-type door interlock (IPA) is an optional accessory.
For information on the accessory installation, consult instruction sheet NVE35521, available on the Schneider Electric website.