Chassis NII_Z_1: Check Device Racking Operation

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 racking operations of the device. Check the device pre-tripping. Check the chassis position indicator.
Goal	Verify that the device operates correctly in its chassis.
Frequency	Refer to Recommended Frequency for the Routine End-User Maintenance Program.
Special indications	Before the check, the device must be de-energized (no current flowing through the device and no voltage present on busbar).
Necessary tools	Racking handle
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

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	Closed	Charged	Connected

Racking Handle Insertion Possibilities

Before starting the check, verify that the racking handle can be inserted into its socket:

The device is not locked with keylocks or padlocks.
If the IBPO racking interlock between the racking handle and the opening pushbutton is installed (MasterPacT MTZ2/MTZ3), press the opening pushbutton to allow insertion of the racking handle.
With VPOC racking interlock option installed, the switchboard door must be closed.

MasterPacT MTZ1

MasterPacT MTZ2/MTZ3

The following table shows the possible ways that the racking handle can be inserted.

Switchboard door	VPOC option	Racking handle insertion
Closed	Absent	Possible
Closed	Present	Possible
Open	Absent	Possible
Open	Present	Not possible⁽¹⁾
(1) Press and hold the racking interlock to insert the racking handle into the racking handle socket.

Racking-out the Device from Connected to Disconnected Position

Step	Action	Corrective action
1	With the drawout device in the chassis, check that the indicators located on the front of the chassis show that the device is closed and in the connected position.	If the position indicator is incorrect, contact your Schneider Electric Services representative.
2	Remove the racking handle from its storage space, and then insert it into the racking handle socket.	If the racking handle cannot be inserted into the racking handle socket, check the insertion possibilities above. If the problem persists, contact your Schneider Electric Services representative.
3	Push in the position release button.
4	Turn the racking handle counterclockwise: MasterPacT MTZ1: one turn. MasterPacT MTZ2/MTZ3: three to four turns. NOTE: The racking handle cannot be turned if the position release button is not pushed in.	If the racking handle cannot be turned, contact your Schneider Electric Services representative.
5	The device opens automatically. Check that the position indicator indicates that the device is in open position.	If the device does not open or the position indicator is incorrect, contact your Schneider Electric Services representative.
6	Continue turning the racking handle counterclockwise until the test position is reached. When the test position is reached, the mechanism blocks the racking handle and the position release button pops out.	If the mechanism is not blocked in the test position or the button does not pop out, contact your Schneider Electric Services representative.
7	Check that the position indicator indicates the test position.	If the indicator is incorrect, contact your Schneider Electric Services representative.
8	Push in the position release button again.
9	Turn the racking handle counterclockwise until the disconnected position is reached. NOTE: The racking handle cannot be turned if the position release button is not pushed in.	If the racking handle cannot be turned, contact your Schneider Electric Services representative.
10	When the disconnected position is reached, the mechanism blocks the racking handle and the position release button pops out.	If the mechanism is not blocked in the disconnected position or the button does not pop out again, contact your Schneider Electric Services representative
11	Check that the position indicator indicates the disconnected position.	If the indicator is incorrect, contact your Schneider Electric Services representative.
12	Remove the racking handle from the racking socket, and then put it back into its storage space.
13	Open the door of the switchboard.

Racking-in the Device from Disconnected to Connected Position

Before starting this check, verify that the device is open and the mechanism is charged.

Step	Action	Corrective action
1	Check that the position indicator located on the front of the chassis indicates the disconnected position.	If the position indicator is incorrect, contact your Schneider Electric Services representative.
2	Remove the racking handle from its storage space, and then insert it into the racking handle socket. NOTE: If the IBPO racking interlock between the racking handle and the opening pushbutton is installed (MasterPacT MTZ2/MTZ3), press the opening pushbutton to allow insertion of the racking handle.	If the racking handle cannot be inserted into the racking handle socket, check the insertion possibilities above. If the problem persists, contact your Schneider Electric Services representative.
3	Push in the position release button.
4	Turn the racking handle clockwise until the test position is reached. NOTE: The racking handle cannot be turned if the position release button is not pushed in.
5	When the test position is reached, the mechanism blocks the racking handle and the position release button pops out.	If the mechanism is not blocked in the test position or the button does not pop out, contact your Schneider Electric Services representative.
6	Check that the position indicator indicates the test position.	If the position indicator is incorrect, contact your Schneider Electric Services representative.
7	Press the closing pushbutton to close the device. The device closes.	If the device does not close, check that: MN undervoltage release is connected to a power supply. The device is charged. If the problem persists, contact your Schneider Electric Services representative.
8	Push in the position release button again.
9	Turn the racking handle clockwise: MasterPacT MTZ1: one turn. MasterPacT MTZ2/MTZ3: six to seven turns. NOTE: The racking handle cannot be turned if the position release button is not pushed in.
10	The device opens automatically.	If the device does not open, contact your Schneider Electric Services representative.
11	Continue turning the racking handle clockwise until the connected position is reached. When the connected position is reached, the mechanism blocks the racking handle and the position release button pops out.	If the mechanism is not blocked in the connected position or the button does not pop out, contact your Schneider Electric Services representative.
12	Check that the position indicator indicates the connected position.	If the position indicator is incorrect, contact your Schneider Electric Services representative.
13	Remove the racking handle from the racking socket, and then put it back into its storage space.
14	Charge the spring mechanism.
15	Close the device.	If the device does not close, check that: MN undervoltage release is connected to a power supply. The device is charged. If the problem persists, contact your Schneider Electric Services representative.