Tests - MTZ2/MTZ3 with MicroLogic Active Control Unit IEC User Guide for AC applications

Overview

The tests to do while commissioning a MasterPacT MTZ circuit breaker are described in this section:

Functional checks
Check of MCH gear motor (if fitted)
Check of electrical continuity
Check of high-voltage insulation
Check of MicroLogic Active internal battery
Check of MicroLogic Active Ready LED status
Test of the tripping mechanism with EcoStruxure Power Commission software
Test of the tripping mechanism on the MicroLogic Active 6.0 display screen
Automatic trip curve test with EcoStruxure Power Commission software

Only do the tests required, depending on the MasterPacT MTZ type and the functions in use, and record the results on the test form. In the event of non-conformance, the result must be recorded and the MasterPacT MTZ circuit breaker must not be accepted into service.

Functional Checks

Follow this procedure to check the operation of the MasterPacT MTZ circuit breaker and record the results on the test form.

Step	Action
1	Manually charge the mechanism by pulling the spring charging handle down.
2	Close the circuit breaker. Check the closing of the circuit breaker in each of the different means designed for the application.
3	Open the circuit breaker. Check the opening of the circuit breaker in each of the different means designed for the application.

If the circuit breaker does not close or does not open, refer to Troubleshooting.

Check of MCH Gear Motor (if Fitted)

Follow this procedure to check the operation of the MCH gear motor and record the results on the test form.

Step	Action
1	Remove the MCH gear motor power supply.
2	Do an opening/closing/opening cycle to discharge the mechanism.
3	With the circuit breaker in the open position and the mechanism discharged, check electrical continuity between terminals B1 and B2, and electrical non-continuity between terminals B1 and B3.
4	Manually charge the mechanism.
5	Reconnect the MCH gear motor power supply. The circuit breaker closes and the mechanism is automatically charged.
6	Check electrical continuity between terminals B1 and B3.
7	Operate the circuit breaker several times to check that the spring mechanism automatically recharges after every closing operation.

Check of Electrical Continuity

Follow this procedure to check electrical continuity using a multimeter or continuity checker and record the results on the test form.

Step

Action

1

Close the circuit breaker.

2

Check electrical continuity, for each of the phases, between the upper and lower power terminals:

For fixed circuit breaker: on the power terminals
For the drawout circuit breaker: on the chassis power terminals, with the circuit breaker in the connected position

Check of High-Voltage Insulation

Dielectric tests (high potential and insulation resistance tests) are used to check the insulation between phases, and insulation between each phase and ground. The equipment used to conduct these tests creates a high potential voltage (thousands of volts) to check dielectric or insulation integrity.

Before conducting any high-voltage insulation tests, unplug any cables from the USB-C port on the front face of the MicroLogic Active control unit.

Follow this procedure to check insulation resistance and record the results on the test form.

Step	Action
1	Unplug any cables from the USB-C port on the front face of the MicroLogic Active control unit.
2	Close the MasterPacT MTZ circuit breaker.
3	Measure the insulation resistance using a 500 Vdc insulation resistance tester between one of the phases and the other two phases grounded. Repeat for each phase.
4	Open the MasterPacT MTZ circuit breaker by pressing the opening pushbutton.
5	Measure the insulation resistance using a 500 Vdc insulation resistance tester between one of the phases and ground, with all other phases grounded. Repeat for each phase.
6	Check that the insulation resistance is above 5 MΩ in each case. If this result is not obtained, contact your Schneider Electric Services representative.

Check of MicroLogic Active Internal Battery

Follow this procedure to check the functioning of the MicroLogic Active internal battery.

Step	Action
1	Press and hold the button for less than 3 seconds to test the internal battery.
2	Check that the trip cause LEDs switch off for one second, and then switch on. If the trip cause LEDs: Blink sequentially: the battery is near the end of its life. Replace the battery. For information about internal battery replacement and installation, consult the instruction sheet on the Schneider Electric website: PKR4244002 MicroLogic Active - Spare Battery - Instruction Sheet. Do not light: check that the battery strip has been removed. If it has, replace the battery. If the battery strip has not been removed, remove it as indicated in the circuit breaker instruction sheet. Refer to Related Documents.

Step

Action

1

Press and hold the button for less than 3 seconds to test the internal battery.

2

Check that the trip cause LEDs switch off for one second, and then switch on.

If the trip cause LEDs:

Blink sequentially: the battery is near the end of its life. Replace the battery.

For information about internal battery replacement and installation, consult the instruction sheet on the Schneider Electric website: PKR4244002 MicroLogic Active - Spare Battery - Instruction Sheet.
Do not light: check that the battery strip has been removed. If it has, replace the battery.

If the battery strip has not been removed, remove it as indicated in the circuit breaker instruction sheet. Refer to Related Documents.

Check of MicroLogic Active Ready LED Status

Follow this procedure to check the functioning of the MicroLogic Active control unit and record the results on the test form.

Step	Action
1	Provide power to the MicroLogic Active control unit, for example, by connecting a PC or Mobile Power Pack to the USB-C port on the front face.
2	Check that the MicroLogic Active Ready LED is flashing green. The Ready LED flashes green to indicate that: The sensors are correctly wired. The tripping mechanism is functioning correctly. The MicroLogic Active control unit is functioning correctly.
3	If the Ready LED is not flashing green, refer to Critical Cases.

Step

Action

1

Provide power to the MicroLogic Active control unit, for example, by connecting a PC or Mobile Power Pack to the USB-C port on the front face.

2

Check that the MicroLogic Active Ready LED is flashing green.

The Ready LED flashes green to indicate that:

The sensors are correctly wired.
The tripping mechanism is functioning correctly.
The MicroLogic Active control unit is functioning correctly.

3

If the Ready LED is not flashing green, refer to Critical Cases.

Test of the Tripping Mechanism With EcoStruxure Power Commission Software

Follow this procedure to test the tripping mechanism of the circuit breaker and record the results on the test form.

Step	Action
1	Close the circuit breaker.
2	Connect a PC running EcoStruxure Power Commission software by using a cable to the USB-C port on the front face of the MicroLogic Active control unit.
3	On EcoStruxure Power Commission software, select the circuit breaker and connect to it.
4	Force the circuit breaker to trip by clicking the Force Trip button on the EcoStruxure Power Commission screen. This action is password-protected.
5	Check that the circuit breaker is open.
6	Check that the blue fault-trip reset button has popped out.
7	Check that the I trip cause LED is blinking red.
8	Check that the SDE contacts have switched.
9	After the test, reset the circuit breaker.

Test of the Tripping Mechanism on the MicroLogic Active 6.0 Display Screen

Follow this procedure to test the tripping mechanism of the circuit breaker when fitted with a MicroLogic Active 6.0 control unit, and record the results on the test form.

Step	Action
1	Close the circuit breaker.
2	Select Maintenance > Ground Protection Test on the MicroLogic Active display screen.
3	Enter the pin code.
4	Press OK to confirm that you want to start the ground-fault protection test and trip the circuit breaker.
5	Check that the G trip cause LED is blinking, and the Ig test trip pop-up trip message is displayed.
6	Check that the circuit breaker is open.
7	Check that the blue fault-trip reset button has popped out.
8	Check that the SDE contacts have switched.
9	Press OK to close the pop-up trip message.
10	Press and hold the button for more than 3 seconds to reset the trip cause LEDs.
11	Manually charge the mechanism by pulling the spring charging handle down six times. When the spring charging handle no longer resists, the mechanism is charged.
12	If the circuit breaker is equipped with an MN undervoltage release, either connect it to the power supply with its rated voltage or remove the MN undervoltage release.
13	Press the closing pushbutton. The circuit breaker must not close.
14	After the test, reset the circuit breaker by pressing the blue reset button.
15	Press the closing pushbutton. The circuit breakercloses.

Automatic Trip Curve Test With EcoStruxure Power Commission Software

Follow this procedure to run the automatic trip curve test and record the results on the test form.

Step	Action
1	Close the circuit breaker.
2	If the circuit breaker is equipped with an MN undervoltage release, either connect it to the power supply with its rated voltage or remove the MN undervoltage release.
3	Connect a PC running EcoStruxure Power Commission software by using a cable to the USB-C port on the front face of the MicroLogic Active control unit.
4	On EcoStruxure Power Commission software, select the circuit breaker and connect to it.
5	In the Device Check up section, click the Device tab.
6	Select the Automatic Trip Test section.
7	Select Preconfigured test point.
8	Select the overcurrent protection to be tested.
9	Click Run Test.
10	Check that the circuit breaker trips.
11	Check that the blue fault-trip reset button has popped out
12	Check that the related trip cause LED is blinking red.
13	Check the SDE contacts have switched.
14	After the test, reset the circuit breaker.