Control Unit NIII_Z_4: Check Overcurrent Protection

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 overcurrent protection (long-time, short-time, instantaneous) by using EcoStruxure Power Commission software installed on a PC. Check fault-trip LEDs. Save the test results to a personal computer.
Goal	Verify that the control unit operates when any electrical fault occurs.
Frequency	Refer to Recommended Frequency for the Intermediate End-User Maintenance Program.
Special indications	–
Necessary tools	A PC running EcoStruxure Power Commission software A USB cable (standard to mini USB port) Waveform capture on trip event Digital Module installed on the MicroLogic X control unit.
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 EcoStruxure Power Commission Online Help

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	Closed	Discharged	N/A
Drawout	Closed	Discharged	Test

Checking Overcurrent Protection and Fault-Trip LEDs

The process of checking overcurrent protection includes the following procedures:

Connect to the MicroLogic X control unit with EcoStruxure Power Commission software.
Launch an automatic trip curve test with preconfigured test points.
Launch an automatic trip curve test with custom test points.

Connecting the MicroLogic X Control Unit to EcoStruxure Power Commission Software

Step	Action
1	If the device is equipped with an MN undervoltage release, either connect it to the power supply with its rated voltage or remove the MN undervoltage release.
2	Connect a PC running EcoStruxure Power Commission software to the MicroLogic X control unit. A Cable plug connected to the mini USB port of MicroLogic X control unit B Standard to mini USB port cable C PC running EcoStruxure Power Commission software
3	Launch EcoStruxure Power Commission software.
4	Click Connect Device Directly on the EcoStruxure Power Commission welcome screen. Result: EcoStruxure Power Commission software connects to the MicroLogic X control unit. A window displays and indicates that the device discovery is in progress.
5	Click NEXT to close the Project Information window.
6	Click SAVE to close the Customer Details window and display the SWITCHBOARD VIEW.
7	Click the Connect to device button.
8	In the Device Check up section, click the Device tab.
9	Follow the procedure Control Unit NII_Z_3 to save settings and the waveform capture to avoid losing this information.
10	Click the Automatic Trip test section.

Launching Automatic Trip Curve Test with Preconfigured Test Points

NOTICE
hazard of unexpected behavior Before launching the automatic trip curve test, make a note of the active trip curve setting (Set A, Set B, or ERMS) and set the circuit breaker to this trip curve at the end of the test. Failure to follow these instructions can result in incorrect settings.

Do the procedure for each of the following overcurrent protection functions:

Long-time Ir
Short-time Isd
Instantaneous Ii
Ground-fault Ig (MicroLogic 6.0 X)
Earth-leakage fault IΔn (MicroLogic 7.0 X)

The following trip curves can be tested:

Set A
Set B
ERMS

After connecting the PC running EcoStruxure Power Commission software to the MicroLogic X control unit, follow this procedure to test overcurrent protection using preconfigured test points:

1	Select Preconfigured test point. Result: EcoStruxure Power Commission software displays the lists of curves and overcurrent protection functions available on the MicroLogic X control unit.
2	Select the trip curve and overcurrent protection to be tested. By default Set A and all the protection functions are selected. You can select one or more trip curves to test.
3	Check that the device is closed and the fault-trip LEDs are off.
4	Click RUN TEST.
5	Read carefully the safety message that displays and click I UNDERSTAND.
6	You are prompted to provide the password: Type the Administrator password of the MicroLogic X control unit. Click CONTINUE. Result: The automatic trip test starts executing.
7	Check that the device trips.	If the device does not trip: Check that the device is closed. Check that the blue fault-trip reset button is pushed-in. Refer to troubleshooting in the appendix. Do the procedure again. If the problem persists, contact your Schneider Electric Services representative.
8	Check that the LED corresponding to the protection tested is on and the MicroLogic X screen display turns to red with the correct event. Example: Isd/Ii LED is on when short-time protection is tested.
9	Check in EcoStruxure Power Commission software that the test is successful.	If the test is successful, reset the thermal memory then continue the next test. If the test fails, reset the thermal memory then redo the test. If the problem persists, contact your Schneider Electric Services representative.
10	Before proceeding to the next protection setting, EcoStruxure Power Commission software prompts you to: Reset the trip cause LEDs by pressing and holding the Test/Reset button on the MicroLogic X control unit until the LEDs are off. Reset the device by pressing the blue fault-trip reset button on the front cover. Close the device.
11	Click CONFIRM. Result: EcoStruxure Power Commission software proceeds to perform the next overcurrent protection test.
12	If you have selected more than one trip curve to test, you are prompted to switch to another trip curve to continue the tests. Press CONFIRM when you are ready to continue. Result: The next trip curve test begins.
13	After completing the automatic trip curve tests, set the circuit breaker to the active trip curve noted before starting the tests.

Launching Automatic Trip Curve Test with Custom Test Points

After connecting the PC running EcoStruxure Power Commission software to the MicroLogic X control unit, follow this procedure to test overcurrent protection functions using custom test points. For phase overcurrent, up to six test points can be added. For ground-fault, only one test point can be tested.

1	Select Custom test point.
2	Add test points as required and define the injection current and time for each test point.
3	Check that the device is closed and the fault-trip LEDs are off.
4	Click RUN TEST.
5	Read carefully the safety message that displays and click I UNDERSTAND.
6	You are prompted to provide the password: Type the Administrator password of the MicroLogic X control unit. Click CONTINUE. Result: The automatic trip test starts executing.
7	Check that the device trips. NOTE: For certain custom test points, based on the injection current and time, a No Trip result may be acceptable. Check the final report for detailed information regarding a No Trip result.	If the device does not trip (for test points where a trip is expected): Check that the device is closed. Check that the blue fault-trip reset button is pushed-in. Refer to troubleshooting in the appendix. Do the procedure again. If the problem persists, contact your Schneider Electric Services representative.
8	Check that the LED corresponding to the protection tested is on and the MicroLogic X screen display turns to red with the correct event. Example: Isd/Ii LED is on when short-time protection is tested.
9	Check in EcoStruxure Power Commission software that the test is successful.	If the test is successful, reset the thermal memory then continue the next test. If the test fails, reset the thermal memory then redo the test. If the problem persists, contact your Schneider Electric Services representative. NOTE: If EcoStruxure Power Commission software displays a No trip result, check the corresponding threshold and time settings of the circuit breaker to determine if a trip was expected for the values entered. A No Trip result may be acceptable if the user-defined values are below the configured settings of the circuit breaker.
10	Before proceeding to the next protection setting, EcoStruxure Power Commission software prompts you to: Reset the trip cause LEDs by pressing and holding the Test/Reset button on the MicroLogic X control unit until the LEDs are off. Reset the device by pressing the blue fault-trip reset button on the front cover. Close the device.
11	Click CONFIRM. Result: EcoStruxure Power Commission software proceeds to perform the next overcurrent protection test.

Saving the Test Results to a PC

After running the overcurrent protection tests, access the test results in EcoStruxure Power Commission software.

Step	Action
1	At the top of the EcoStruxure Power Commission window, click Reports > Automatic Trip Test Report for MasterPacT MTZ. A window opens and displays the report.
2	Save the report on the PC and print it, if needed.
3	Exit EcoStruxure Power Commission software.

Step

Action

1

At the top of the EcoStruxure Power Commission window, click Reports > Automatic Trip Test Report for MasterPacT MTZ.