Chassis NIII_Z_1: Check Operation of CD, CT, CE Position Contacts and EF Auxiliary Contacts - 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	Operate the chassis position contacts: CD disconnected position contact CT test position contact CE connected position contact EF combined connected/closed auxiliary contact (MasterPacT MTZ2/MTZ3)
Goal	Verify consistency between actual position of the device in the chassis and the indications given by the position contacts.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	If the device positions in the chassis are indicated on the front panel of the switchboard, make sure that the auxiliary circuits are energized. If the device positions in the chassis are not indicated on the front panel of the switchboard, isolate the auxiliary circuits and use an ohmmeter or a tester to test them.
Necessary tools	Ohmmeter or tester
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 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet MasterPacT MTZ2/MTZ3 - EF Combined Connected/Closed Contact - 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	N/A	N/A	N/A
Drawout	Open	Discharged	Disconnected NOTE: It is advisable to check the positions with the device in the chassis to obtain the correct position of the actuators.

Location of Contacts in the MasterPacT MTZ1 Devices

Location of Contacts in the MasterPacT MTZ2/MTZ3 Devices

Wiring Diagrams of CD, CT, and CE Position Contacts

The following wiring diagrams show the case of a MasterPacT MTZ2/MTZ3 chassis with three CD, three CT, and three CE contacts, that is, the standard configuration without EIFE embedded Ethernet interface. The checking operations are based on this configuration. The availability of the position contacts depends on the customer configuration.

CD position contacts		CT position contacts		CE position contacts

Checking Position Contacts With Device in Disconnected Position

The CD position contacts indicate that the device is in the disconnected position.

Step	Action	Corrective action
1	Check that the device is in the disconnected position. NOTE: If needed, refer to device racking operations as per procedure Chassis NII_Z_1.
2	Check that the signal is consistent with the device position by using the LED on the switchboard, if any.	If the LED on the switchboard does not operate, check the LED and the voltage power supply.
3	Remove the auxiliary terminal shield from a drawout device, if present.
4	For a MasterPacT MTZ2/MTZ3 device, remove the terminal block identification plate.
5	Identify and disconnect all wires for the CD, CT, and CE position contacts, and EF auxiliary contacts, if present.
6	For MasterPacT MTZ1, use an ohmmeter or tester: To check electrical continuity between terminals: 811-814 on CD1 contact. 821-824 on CD2 contact. To check electrical non-continuity between terminals: 911-912 on CT1 contact. 311-314 on CE1 contact. 321-324 on CE2 contact. 331-334 on CE3 contact. For MasterPacT MTZ2/MTZ3, use an ohmmeter or tester: To check electrical continuity between terminals: 811-814 on CD1 contact. 821-824 on CD2 contact. 831-834 on CD3 contact. To check electrical non-continuity between terminals: 911-912 on CT1 contact. 921-922 on CT2 contact. 931-932 on CT3 contact. 311-314 on CE1 contact. 321-324 on CE2 contact. 331-334 on CE3 contact.	If a contact does not operate: Check the fixing of the CD contact actuator and manually operate it (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet). Check contact status again. If the contact still does not operate, replace the auxiliary terminal block (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet). If the problem persists, contact your Schneider Electric Services representative.
7	If the device has other CD contact blocks, check the corresponding contacts.
8	Put the device in the test position.

Checking Position Contacts With Device in Test Position

The CT position contacts indicate that the device is in the test position.

Step	Action	Corrective action
1	Check that the device is in the test position. NOTE: If needed, refer to device racking operations as per procedure Chassis NII_Z_1.
2	Check that the signal is consistent with the device position by using the LED on the switchboard, if any.	If the LED on the switchboard does not operate, check the LED and the voltage power supply.
3	For MasterPacT MTZ1, use an ohmmeter or tester: To check electrical continuity between terminals 911-912 on CT1 contact. To check electrical non-continuity between terminals: 811-814 on CD1 contact. 821-824 on CD2 contact. 311-314 on CE1 contact. 321-324 on CE2 contact. 331-334 on CE3 contact. For MasterPacT MTZ2/MTZ3, use an ohmmeter or tester: To check electrical continuity between terminals: 911-912 on CT1 contact. 921-922 on CT2 contact. 931-932 on CT3 contact. To check electrical non-continuity between terminals: 811-814 on CD1 contact. 821-824 on CD2 contact. 831-834 on CD3 contact. 311-314 on CE1 contact. 321-324 on CE2 contact. 331-334 on CE3 contact.	If a contact does not operate: Check the fixing of the CT contact actuator and manually operate it (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet). Check contact status again. If the contact still does not operate, replace the auxiliary terminal block (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet). If the problem persists, contact your Schneider Electric Services representative.
4	If the device has other CT contact blocks, check the corresponding contacts.
5	Put the device in the connected position.

Checking Position Contacts With Device in Connected Position

The CE position contacts indicate that the device is in the connected position.

Step	Action	Corrective action
1	Check that the device is in the connected position. NOTE: If needed, refer to device racking operations as per procedure Chassis NII_Z_1.
2	Check that the signal is consistent with the device position by using the LED on the switchboard, if any.	If the LED on the switchboard does not operate, check the LED and the voltage power supply.
3	For MasterPacT MTZ1, use an ohmmeter or tester: To check electrical continuity between terminals: 311-312 on CE1 contact. 321-322 on CE2 contact. 331-332 on CE3 contact. To check electrical non-continuity between terminals: 811-814 on CD1 contact. 821-824 on CD2 contact. 911-912 on CT1 contact. For MasterPacT MTZ2/MTZ3, use an ohmmeter or tester: To check electrical continuity between terminals: 311-312 on CE1 contact. 321-322 on CE2 contact. 331-332 on CE3 contact. To check electrical non-continuity between terminals: 811-814 on CD1 contact. 821-824 on CD2 contact. 831-834 on CD3 contact. 911-912 on CT1 contact. 921-922 on CT2 contact. 931-932 on CT3 contact.	If a contact does not operate: Check the fixing of the CE contact actuator and manually operate it (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet). Check contact status again. If the contact still does not operate, replace the auxiliary terminal block (refer to MasterPacT MTZ1/MTZ2/MTZ3 - Position Contacts (Connected / Disconnected / Test) - Instruction Sheet). If the problem persists, contact your Schneider Electric Services representative.
4	If the device has other CE contact blocks, check the corresponding contacts.
5	Reconnect all the wires for the CD, CT, and CE position contacts.
6	For MasterPacT MTZ2/MTZ3 with optional EF auxiliary contacts, check operation of these contacts.
7	Put the terminal block identification plate and the auxiliary terminal shield back in place.

Wiring Diagram of EF Auxiliary Contacts (Option on MasterPacT MTZ2/MTZ3)

The availability of the EF auxiliary contacts depends on the device.

Checking Operation of EF Auxiliary Contacts (MasterPacT MTZ2/MTZ3)

DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH Check that the device and the chassis are de-energized on the upstream and downstream terminals. Failure to follow these instructions will result in death or serious injury.

This EF information combines the device connected (CE) contact and device closed (OF) contact to produce the circuit connected/closed signal.

Step	Action	Corrective action
1	Put the device in the connected position.
2	Close the device.
3	Check that the signal is consistent with the device position by using the LED on the switchboard, if any.	If the LED on the switchboard does not operate, check the LED and the voltage power supply.
4	With the device in the connected position and with poles closed, use an ohmmeter or tester: To check electrical continuity between terminals 115-116. To check electrical non-continuity between terminals 115-118.	If a contact does not operate: Put the device in the test position. Check the fixing of the EF contact actuator and manually operate it (refer to MasterPacT MTZ2/MTZ3 - EF Combined Connected/Closed Contact - Instruction Sheet). Check contact status again. If the contact still does not operate, replace the EF contact (refer to MasterPacT MTZ2/MTZ3 - EF Combined Connected/Closed Contact - Instruction Sheet If there is still no improvement: Check the operation of the OF indication contact as per procedure Auxiliaries NIII_Z_1. If necessary, replace the OF contact. If the problem persists, contact your Schneider Electric Services representative.
5	Open the device.
6	With the device in the connected position and with poles open, use an ohmmeter or tester: To check electrical continuity between terminals 115-118. To check electrical non-continuity between terminals 115-116.
7	If the device has other EF auxiliary contact block, check them.
8	Put the terminal block identification plate and the auxiliary terminal shield back in place.