Device NII_Z_1: Check the General Condition of the Device - 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	Visually check that there are no visible signs of aging or damage on the different parts of the device.
Goal	Verify the general condition of the device in operation or following long storage.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	–
Necessary tools	–
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 3P/4P - Front Cover - Instruction Sheet MasterPacT MTZ2 3P/4P - Front Cover - Instruction Sheet MasterPacT MTZ1/MTZ2/MTZ3 - MicroLogic Transparent Cover - Instruction Sheet MicroLogic X - Spare Battery - Instruction Sheet MicroLogic X - Embedded Display - Instruction Sheet MicroLogic Xi - Embedded Display - 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 the Front Cover of the Device

Step	Action	Corrective action
1	Check presence of all screws on the front cover: For MasterPacT MTZ1: four screws. For MasterPacT MTZ2/MTZ3: five screws.	If any screws are missing, replace the front cover (refer to MasterPacT MTZ 3P/4P - Front Cover - Instruction Sheet). Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
2	Check that the front cover is not cracked, split open, or deformed.	If the front cover is damaged, replace it (refer to MasterPacT MTZ 3P/4P - Front Cover - Instruction Sheet). Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
3	Check that the identification labels are present on the device and the chassis, including: Identification labels (bar code) Rating plate	To replace the rating plate, contact your Schneider Electric Services representative.
4	If available, check the label indicating the date of the last maintenance operation.

Checking the MicroLogic X Control Unit

Step	Action	Corrective action
1	Check that the transparent cover is in place.	If the transparent cover is not correctly mounted, remove it then mount it again (refer to MasterPacT MTZ1/MTZ2/MTZ3 - MicroLogic Transparent Cover - Instruction Sheet). If the transparent cover is missing or damaged, replace it. Refer to the MasterPacT MTZ with MicroLogic X Control Unit - Catalog for spare parts.
2	To open the transparent cover, pull its upper right-hand side corner. NOTE: The transparent cover must be opened to modify the protection settings locally or to access the mini USB port on the front of the MicroLogic X control unit. At the end of each check when using the mini USB port: Remove the cable from the mini USB port. Close the transparent cover completely. The cover does not need to be opened when modifying the protection settings remotely.
3	Briefly press (<1 s) the Test/Reset button and check that the four trip cause LEDs and the red Service LED are on.	If one LED does not light up, contact your Schneider Electric Services representative. If the four LEDs light up in sequence or the four trip cause LEDs and the red Service LED do not light up: Replace the MicroLogic X internal battery (refer to MicroLogic X - Spare Battery - Instruction Sheet). Do the procedure again. NOTE: If the LEDs light up in sequence, the red Service LED remains lit until the battery is changed or empty. If the problem persists, contact your Schneider Electric Services representative.
4	Connect the MicroLogic X control unit to a power supply. For example, connect the Mobile Power Pack external battery to the MicroLogic X USB port.
5	Check that the Ready LED is flashing, meaning that the fault detection chain is working correctly.	If the LED does not flash and no event message is displayed on the control unit, contact your Schneider Electric Services representative to replace the MicroLogic X control unit.
6	Press the Bluetooth button and check that the Bluetooth LED is on.	If the LED does not light up, replace the MicroLogic X display screen (refer to MicroLogic X - Embedded Display - Instruction Sheet).
7	Check the legibility of the data and settings displayed on the MicroLogic X display screen. NOTE: The protection functions remain operational when the MicroLogic X display screen is not operating correctly. Settings and data can be viewed on other interfaces, for example, EcoStruxure Power Commission software.	If the display is not legible, or if the contextual buttons are not operating correctly, replace the MicroLogic X display screen (refer to MicroLogic X - Embedded Display - Instruction Sheet).

Cleaning the Device

NOTICE
HAZARD OF EQUIPMENT DAMAGE Do not use pressurized cleaning products or products containing solvents (trichloroethane or trichloroethylene) such as WD40. Failure to follow these instructions can result in equipment damage.

Pressurized cleaning products can cause the following damages:

Removal of grease from inaccessible lubrication points. These areas are greased for the life of the device and cannot be regreased.
Corrosion of points that are not regreased.
Damage caused by the pressure applied by the cleaning product.
Temperature rise due to the presence of an insulating solvent in the contact zones.
Elimination of special protection.
Deterioration of plastic materials.

Step	Action	Comment
1	Clean the device using a clean, dry cloth or a brush.	If there is excessive dust, contact your Schneider Electric Services representative.

Checking the Case of the Device and Chassis for Drawout Device

Step	Action	Corrective action
1	Check for cracks and change in color.	If there are cracks or change in color, contact your Schneider Electric Services representative.
2	Check for traces of black smoke (indicating tripping due to a short-circuit) around the arc chutes and on the sides. NOTE: For a fixed device, remove the additional support brackets, if necessary.	If there are traces of black smoke, contact your Schneider Electric Services representative.

Step

Action

Corrective action

1

Check for cracks and change in color.

If there are cracks or change in color, contact your Schneider Electric Services representative.

2

Check for traces of black smoke (indicating tripping due to a short-circuit) around the arc chutes and on the sides.

NOTE: For a fixed device, remove the additional support brackets, if necessary.

If there are traces of black smoke, contact your Schneider Electric Services representative.

Checking Connections

Step	Action	Corrective action
1	Visually check the device terminals for a change in color indicating abnormal temperature rise. For fixed devices: customer terminals For drawout devices: Customer terminals Internal terminals Disconnecting contact clusters	If there is a change in color on device terminals and you are qualified, follow procedure Power Connections NIII_Z_1. Otherwise, contact your Schneider Electric Services representative.
2	Visually check the condition of cable insulation (for example, change in color, cracks, or cable shrinkage).	If the cables show signs of damage to insulation and you are qualified, follow procedure Power Connections NIII_Z_1. Otherwise, contact your Schneider Electric Services representative.

Step

Action

Corrective action

1

Visually check the device terminals for a change in color indicating abnormal temperature rise.

For fixed devices: customer terminals
For drawout devices:
- Customer terminals
- Internal terminals
- Disconnecting contact clusters

If there is a change in color on device terminals and you are qualified, follow procedure Power Connections NIII_Z_1. Otherwise, contact your Schneider Electric Services representative.

2

Visually check the condition of cable insulation (for example, change in color, cracks, or cable shrinkage).

If the cables show signs of damage to insulation and you are qualified, follow procedure Power Connections NIII_Z_1. Otherwise, contact your Schneider Electric Services representative.

Checking Connections in Corrosive Environments

In the case of corrosive environments, contact your Schneider Electric Services representative.

For example, devices may be used in places where sulfur dioxide (SO₂) or hydrogen sulphide (H₂S) are present, such as, steel works, paper mills, synthetic fibers, refineries, and sulfur chemical plants. Corrosive chemicals can have an impact on the integrity of the device:

Excessive temperature rise causes sulfurization (oxidation) of silver and results in destructionof contacts.
Contact with SO₂ and H₂S blackens solid silver and silver-plated contacts which increases contact resistance and temperature.