Auxiliaries NIII_Z_1: Check Operation of Indication Contacts (OF, PF) - MTZ Basic Standard Maintenance Procedures

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 operation of indication contacts OF and PF.
Goal	Verify electrical continuity of the installed contacts and contact robustness.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	–
Necessary tools	Ohmmeter LV847074SP terminal block
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 - OF ON/OFF Indication Contacts - Instruction Sheet MasterPacT MTZ2/MTZ3 - OF ON/OFF Indication Contacts - Instruction Sheet MasterPacT MTZ1/MTZ2/MTZ3 - PF Ready-To-Close Contact - Instruction Sheet MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - 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	Open	Discharged	N/A
Drawout	Open	Discharged	Test

OF Indication Contact Wiring Diagram

The number of OF indication contacts depends on the device type:

A block of four OF indication contacts is supplied as standard on MasterPacT MTZ1 and MasterPacT MTZ2/MTZ3 devices.
Two additional blocks of four OF indication contacts (OF11–OF14, OF21–OF24) are optional on MasterPacT MTZ2/MTZ3 devices.

Checking Operation of OF Indication Contacts

Do this procedure for each OF indication contact of the device.

Step	Action	Corrective action
1	Check that the device is in the open position.
2	Check electrical continuity between terminals: 41-42 31-32 21-22 11-12 If additional OF blocks are installed, check all terminals.	In case of electrical non-continuity between terminals: For a fixed device: replace the OF contact (refer to MasterPacT MTZ - OF ON/OFF Indication Contacts - Instruction Sheet) and do the procedure again. For a drawout device, check that the OF contact operates correctly, as follows: 1. Put the device in the withdrawn position. 2. Insert an LV847074SP terminal block at the appropriate location on the device. 3. Check the electrical continuity directly on the LV847074SP terminal block: If the OF contact operates correctly, replace the auxiliary terminal block (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - Instruction Sheet) and do the procedure again with the device in the test position. If the OF contact does not operate correctly, replace the OF contact and do the procedure again with the device in the test position. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts. If the problem persists, contact your Schneider Electric Services representative.
3	Close the device.
4	Check electrical continuity between terminals: 41-44 31-34 21-24 11-14 If additional OF blocks are installed, check all terminals.	In case of electrical non-continuity between terminals, see the corrective action concerning electrical continuity above.

PF Ready-To-Close Contact Wiring Diagram

Checking Operation of PF Ready-To-Close Contact

Step	Action	Corrective action
1	Close the device.
2	Verify that the PF contact indicates that the device is not ready-to-close: Check electrical continuity between terminals 251-254. Check electrical non-continuity between terminals 251-252.	In case of electrical non-continuity between terminals 251-254, or electrical continuity between terminals 251-252: For a fixed device: replace the PF contact (refer to MasterPacT MTZ1/MTZ2/MTZ3 - PF Ready-To-Close Contact - Instruction Sheet) and do the procedure again. For a drawout device, check that the PF contact operates correctly, as follows: 1. Put the device in the withdrawn position. 2. Insert an LV847074SP terminal block at the appropriate location on the device. 3. Check the electrical continuity and non-continuity directly on the LV847074SP terminal block: If the PF contact operates correctly, replace the auxiliary terminal block (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - Instruction Sheet) and do the procedure again with the device in the test position. If the PF contact does not operate correctly, replace the PF contact and do the procedure again with the device in the test position. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts. If the problem persists, contact your Schneider Electric Services representative.
3	Open the device.
4	Charge the mechanism.
5	Check that the device is not tripped. Check that the device does not have a permanent opening order from an MN undervoltage release. Check that the device does not have a permanent opening order from an MX opening voltage release. The device is ready-to-close.	If the device is tripped, reset it by pushing in the blue fault-trip reset button. 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. If the device is equipped with an MX opening voltage release, remove the power supply to the MX.
6	Verify that the PF contact indicates that the device is ready-to-close: Check electrical continuity between terminals 251-252. Check electrical non-continuity between terminals 251-254.	In case of electrical non-continuity between terminals 251-252, or electrical continuity between terminals 251-254, see the corrective action concerning electrical continuity above.