Masterpact MTZ2/MTZ3 Interlocking Actions
An interlocking action is an automatic locking operation provided by interlocking accessories added to the Masterpact MTZ2/MTZ3 device or cradle.
A number of optional interlocking accessories are available for the Masterpact MTZ2/MTZ3 device and cradle. For a complete listing of available interlocks, refer to catalog 0614CT1701, Masterpact MTZ Power Circuit Breakers and Switches, available on the Scheider Electric website.
For detailed installation instructions on field-installable interlocks, refer to the installation instructions shipped with these accessories.
Masterpact MTZ2/MTZ3 Cradle Rejection Feature
The cradle rejection feature allows the installation of a Masterpact MTZ2/MTZ3 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 MTZ2/MTZ3 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 HRB28360 on the Schneider Electric website.
Masterpact MTZ2/MTZ3 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 ABCD on the cradle corresponds to the combination 567 on the device.
Pins on the cradle are labeled A, B, C, D, E, F, G.
Pins on the device are labeled 1, 2, 3, 4, 5, 6, 7.
Masterpact MTZ2/MTZ3 Cradle Rejection Recommended Pin Combinations
The following are the recommended pin combinations:
|
Pins on Cradle |
Pins on Device |
Pins on Cradle |
Pins on Device |
|---|---|---|---|
|
ABCD |
567 |
BCDE |
167 |
|
ABCE |
467 |
BCDF |
157 |
|
ABCF |
457 |
BCDG |
156 |
|
ABCG |
456 |
BCEF |
147 |
|
ABDE |
367 |
BCEG |
146 |
|
ABDF |
357 |
BCFG |
145 |
|
ABDG |
356 |
BDEF |
137 |
|
ABEF |
347 |
BDE |
136 |
|
ABEG |
346 |
BDFG |
135 |
|
ABFG |
345 |
BEFG |
134 |
|
ACDE |
267 |
CDEF |
127 |
|
ACDF |
257 |
CDEG |
126 |
|
ACDG |
256 |
CDFG |
125 |
|
ACEF |
247 |
CEFG |
124 |
|
ACEG |
246 |
DEFG |
123 |
|
ACFG |
245 |
||
|
ADEF |
237 |
||
|
ADEG |
236 |
||
|
ADFG |
235 |
||
|
AEFG |
234 |
Masterpact MTZ2/MTZ3 VPEC Door Interlock
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.
VPEC Door Interlock Accessory
The VPEC door interlock accessory is an optional accessory that is mounted on the left or right side of the cradle. One door interlock is necessary for one cradle
For information on the accessory installation, consult instruction sheet NVE35493 on the Schneider Electric website.
Using VPEC Accessory to Lock the Equipment Door
|
Step |
Action |
|
|---|---|---|
|
1 |
Close the equipment door. |
|
|
2 |
Put the device into the test or connected position (see Masterpact MTZ2/MTZ3 Connection). |
|
|
3 |
Check that the equipment door is locked. |
|
Unlocking Equipment Door Locked with VPEC Accessory
|
Step |
Action |
|
|---|---|---|
|
1 |
Put the device into the disconnected position (see Masterpact MTZ2/MTZ3 Disconnection). |
|
|
2 |
Check that the equipment door is unlocked. |
|
Masterpact MTZ2/MTZ3 VPOC Open-Door Racking Interlock
With the racking interlock installed, a drawout Masterpact MTZ2/MTZ3 device cannot be racked in or out when the equipment door is open because the racking handle cannot be inserted.
VPOC Open-Door Racking Interlock
The optional VPOC racking interlock can be installed on the right side of the cradle.
For information on the accessory installation, consult instruction sheet NVE35494 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 MTZ2/MTZ3 IPA Cable-Type Door Interlock
The IPA cable-type door interlock is an optional accessory. When 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 is mounted on the right-hand side of the device.
When the interlock is installed, the mechanical interlock for transfer switches cannot be implemented.
For information on the accessory installation, consult instruction sheet NVE35495 on the Schneider Electric website.
Mechanically Interlocking Masterpact MTZ Transfer Switches
The mechanical interlocking between Masterpact MTZ transfer switches prevents the interlocked devices from closing at the same time. The following interlocking functions are available:
-
Interlocking between two devices
-
Interlocking between three devices:
-
Three incomers
-
Two incomers and one coupling
-
Two incomers and one replacement
-
Mechanical Interlocking Between Two Masterpact MTZ Devices
Two devices can be mechanically interlocked by cables or by rods so that both devices cannot be closed at the same time.
|
QR |
QN |
||
|
0 |
0 |
||
|
1 |
0 |
||
|
0 |
1 |
||
For information on the accessory installation, consult the instruction sheet on Schneider Electric website:
Mechanical Interlocking Between Three Main Masterpact MTZ Device
Mechanical interlocking is between three main devices connected to different power sources.
Only one of the three devices can be in the closed position at a time. The other two devices are held in the locked open position.
|
QS1 |
QS2 |
QS3 |
|
|
0 |
0 |
0 |
|
|
1 |
0 |
0 |
|
|
0 |
1 |
0 |
|
|
0 |
0 |
1 |
|
For information on the accessory installation, consult instruction sheet NVE35498 on the Schneider Electric website.
Mechanical Interlocking Between Two Main and One Tie Masterpact MTZ Devices
Mechanical interlocking is between two main devices connected to different power sources and one tie device.
Two of the three devices can be in the closed position at any time.
For information on the accessory installation, consult instruction sheet NVE35500 on the Schneider Electric website.
Mechanical Interlocking Between Two Main and One Replacement Masterpact MTZ Devices
Mechanical interlocking is between two main devices connected to the same power source and a third device connected to a generator power source.
The generator device is locked open when either or both of the main devices are closed.
|
QN1 |
QN2 |
QR |
|
|
0 |
0 |
0 |
|
|
1 |
0 |
0 |
|
|
0 |
1 |
0 |
|
|
1 |
1 |
0 |
|
|
0 |
0 |
1 |
|
For information on the accessory installation, consult instruction sheet NVE35499 on the Schneider Electric website.
Masterpact MTZ DAE Automatic Spring-Discharge Interlock
The DAE automatic spring-discharge interlock releases the closing spring energy when a drawout Masterpact MTZ2/MTZ3 device is moved from the disconnected position to the withdrawn position.
The DAE interlock is factory installed as a standard interlock mounted inside the device.
Masterpact MTZ2/MTZ3 IBPO Racking Interlock
The IBPO racking interlock is factory installed as a standard interlock mounted inside the device.
With the IBPO racking interlock installed, a drawout Masterpact MTZ2/MTZ3 device cannot be disconnected in the closed position.
Insertion of the racking handle for connection or disconnection of the drawout device is only possible when the opening pushbutton is pressed.
Inserting the Racking Handle with IBPO Racking Interlock Installed
|
Step |
Action |
|
|---|---|---|
|
1 |
Press and hold the opening pushbutton. |
|
|
2 |
Insert the racking handle. |
|