Auxiliaries NII_Z_1: Check Auxiliary Wiring and Insulation

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	Visually check external and internal wiring and insulation of control and indication auxiliaries.
Goal	Verify electrical continuity of auxiliary circuits and contact robustness.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	–
Necessary tools	Flat screwdriver, 3 mm
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/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	Disconnected

Checking Terminal Block and Connector Wiring

DANGER
HAZARD OF ELECTRIC SHOCK Use a properly rated voltage sensing device to confirm that the PTE voltage measurement input is de-energized (V1, V2, V3 on UC4 terminal block, VN on UC3 terminal block). Failure to follow these instructions will result in death or serious injury.

Step	Action	Corrective action
1	Remove the auxiliary terminal shield from a drawout device, if present.
2	Check that the external wiring is connected securely in the terminals.	If the connection is loose, replace the terminal blocks (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - Instruction Sheet). Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Visually check the insulation of the external wiring.	If the wire insulation is cracked or damaged, replace the wires.
4	Check the terminal blocks for warping, damage, or change in color indicating abnormal temperature rise.	If there is a change in color, replace the terminal blocks (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - Instruction Sheet).
5	For a MasterPacT MTZ2/MTZ3 drawout device, remove the terminal block identification plate.
6	Check the connection and wire insulation between the two parts of the terminal blocks.	If the connection is loose or the wire insulation is cracked or damaged, replace the terminal blocks (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - Instruction Sheet).
7	Check the mounting of connectors on the auxiliary crossbar.	If a connector is damaged, replace the terminal block (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Auxiliary Terminals - Instruction Sheet). If the crossbar is damaged, contact your Schneider Electric Services representative.
8	For a device with ULP port module, refer to Checking Connection on the Optional ULP Port Module. For a device with EIFE interface, refer to Checking Connection on the Optional EIFE Interface.
9	Put the terminal block identification plate and the auxiliary terminal shield back in place.

Checking Connections on the Optional ULP Port Module

Step	Action	Corrective action
1	Check the connection of the 24 Vdc power supply on the ULP port module.	If the cable is loose, tighten it. If the cable insulation is cracked or damaged, replace the cable. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
2	Check the connection of the ULP cords on the ULP port module.	If a plug clip on an RJ45 connector is damaged, replace the ULP cord. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Check the ULP cord insulation.	If the insulation is cracked or damaged, replace the ULP cord. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

Step

Action

Corrective action

Check the connection of the 24 Vdc power supply on the ULP port module.

If the cable is loose, tighten it.
If the cable insulation is cracked or damaged, replace the cable.

Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

Check the connection of the ULP cords on the ULP port module.

If a plug clip on an RJ45 connector is damaged, replace the ULP cord.

Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

Check the ULP cord insulation.

If the insulation is cracked or damaged, replace the ULP cord.

Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

Checking Connections on the Optional EIFE Interface

Step	Action	Corrective action
1	Check the connection of the ULP cord on the EIFE interface.	If the cable is loose, tighten it. If the cable insulation is cracked or damaged, replace the cable. If the plug clip on the connector is damaged, replace the cable. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
2	Check the connections of the Ethernet cables on the EIFE interface.	If a plug clip on an RJ45 connector is damaged, replace the Ethernet cable.
3	Check the Ethernet cable insulation.	If the insulation is cracked or damaged, replace the Ethernet cable.

Step

Action

Corrective action

Check the connection of the ULP cord on the EIFE interface.

If the cable is loose, tighten it.
If the cable insulation is cracked or damaged, replace the cable.
If the plug clip on the connector is damaged, replace the cable.

Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.

Check the connections of the Ethernet cables on the EIFE interface.

If a plug clip on an RJ45 connector is damaged, replace the Ethernet cable.

Check the Ethernet cable insulation.

If the insulation is cracked or damaged, replace the Ethernet cable.