Mechanism NII_Z_2: Charge the Device Electrically with MCH Gear Motor - 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 the MCH gear motor and its charging time. Check the operation of the CH contact of the MCH gear motor. Check the number of charging operations of MCH gear motor from a mobile device.
Goal	Verify that the device charges electrically.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	Connect the MCH gear motor to the power supply.
Necessary tools	Stopwatch 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 MTZ - MicroLogic X Control Unit - User Guide MasterPacT MTZ - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - Maintenance Guide MasterPacT MTZ1 - MCH Gear Motor - Instruction Sheet for operating limits MasterPacT MTZ2/MTZ3 - MCH Gear Motor - 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

MCH Gear Motor Wiring Diagram

MCH Gear Motor Charging Time Definition

The charging time is the time elapsed between the closing order and the moment when the mechanism is fully charged.

The charging time during the closing operation does not exceed 6 seconds.

Checking Operation of MCH Gear Motor and CH Contact

Step	Action	Corrective action
1	Remove the MCH gear motor power supply.
2	Do an opening/closing/opening cycle to discharge the mechanism.
3	With the device in the open position and the mechanism discharged, check electrical continuity between terminals B1-B2, and electrical non-continuity between terminals B1-B3.	In case of electrical non-continuity between terminals B1-B2, or electrical continuity between terminals B1-B3: For a fixed device: replace the MCH gear motor (refer to MasterPacT MTZ - MCH Gear Motor - Instruction Sheet) and do the procedure again. For a drawout device, check that the MCH gear motor 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 between terminals B1-B2 and non-continuity between terminals B1-B3 directly on the LV847074SP terminal block. If the check is correct, 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 check is not correct, replace the MCH gear motor 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.
4	Manually charge the mechanism.
5	Reconnect the MCH gear motor power supply.
6	Start the stopwatch while pressing the closing pushbutton. The device closes and the mechanism is automatically charged.	If the device does not close, refer to troubleshooting in the appendix. If the problem persists, contact your Schneider Electric Services representative.
7	Stop the stopwatch when the mechanism is totally charged.
8	Check the mechanism charging time: it must not exceed 6 seconds.	If the charging time exceeds 6 seconds, do the procedure three more times from the beginning. If the charging time does not improve, follow the procedure Mechanism NIII_Z_1 to check the voltage supply of the MCH gear motor. If there is still no improvement, replace the MCH gear motor and measure the charging time again. If the problem persists, contact your Schneider Electric Services representative.
9	Check electrical continuity between terminals B1-B3.	In case of electrical non-continuity between terminals B1-B3, see the corrective action concerning electrical continuity above.

Checking Number of Charging Operations of MCH Gear Motor From EcoStruxure Power Device App on a Smartphone

You can read the charging motor counter remotely from EcoStruxure Power Device app with Bluetooth Low Energy connection.

Step	Action	Corrective action
1	Read the value on the mobile application. For information about EcoStruxure Power Device app, refer to MasterPacT MTZ - MicroLogic X Control Unit - User Guide.
2	Compare the value with the maximum number of charging operations indicated in MasterPacT MTZ - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - Maintenance Guide .	If the limit has been reached, replace the MCH gear motor (refer to MasterPacT MTZ - MCH Gear Motor - Instruction Sheet). If the limit is close, preventively replace the MCH gear motor (refer to MasterPacT MTZ - MCH Gear Motor - Instruction Sheet).

Step

Action

Corrective action

1

Read the value on the mobile application.

For information about EcoStruxure Power Device app, refer to MasterPacT MTZ - MicroLogic X Control Unit - User Guide.

2

Compare the value with the maximum number of charging operations indicated in MasterPacT MTZ - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - Maintenance Guide .

If the limit has been reached, replace the MCH gear motor (refer to MasterPacT MTZ - MCH Gear Motor - Instruction Sheet).
If the limit is close, preventively replace the MCH gear motor (refer to MasterPacT MTZ - MCH Gear Motor - Instruction Sheet).