Resetting the Circuit Breaker after a Trip Due to an Invalid Micrologic X Control Unit Self-Test

Masterpact MTZ1 Circuit Breaker Reset Sequence

The table shows the sequence of actions to follow after a trip due to an electrical fault. Further explanation of each action is given in the following paragraphs.

Step	Description
1	Identify the trip cause by using the Micrologic X control unit HMI.
2	Acknowledge the trip message on the Micrologic X control unit.
3	Clear the electrical fault on the network .
4	Inspect the circuit breaker and switchboard after a short circuit.
5	Reset the circuit breaker (see Resetting Masterpact MTZ Devices).
6	When the circuit breaker is ready-to-close, re-close it (see Closing the Masterpact MTZ1 Mechanism).

Masterpact MTZ Circuit Breaker Trip Cause Identification

Status LEDs	Micrologic X display screen T	Trip Cause LEDs	Probable Cause
Ready LED off. Service LED red.		All LEDs are on.	Invalid Micrologic control unit self test (see Resetting the Circuit Breaker after a Trip Due to an Invalid Micrologic X Control Unit Self-Test).

Status LEDs

Micrologic X display screen T

Trip Cause LEDs

Probable Cause

Ready LED off.

Service LED red.

All LEDs are on.

Invalid Micrologic control unit self test (see Resetting the Circuit Breaker after a Trip Due to an Invalid Micrologic X Control Unit Self-Test).

Micrologic X Display Screen Trip Message Acknowledgement

Step	Action
1	Press OK. The screen displays: A description of the trip cause. The date and time that the trip cause occurred.
2	Consult the list of possible detected trip causes in the following table and perform the actions recommended.
3	Press OK to acknowledge the trip and return to the Home menu.
4	Press the Test/Reset button for 3 seconds to reset the control unit and switch off the trip cause and service LEDs.

Recommended Actions After a Trip Due to Invalid Micrologic X Control Unit Self Test

Code	Trip Message	Description	Recommended Action
0x1400 0x1404 0x1405 0x1406 0x1416	CU self-test major malfunction	The control unit self-test detected a major malfunction in the control unit operation. NOTE: The control unit may or may not trip the circuit breaker, depending on how the fallback position is configured.	Call Schneider Electric field service to replace the control unit.
0x1402	Internal current sensor disconnected	The control unit self-test detected the disconnection of an internal sensor of the circuit breaker.	Call Schneider Electric field service to replace the control unit.
0x1403	ENCT disconnected	The control unit self-test detected the disconnection of the external neutral current sensor of the circuit breaker.	Reconnect the external neutral current sensor (ENCT).
0x6407	Self diagnostic trip	The control unit tripped the circuit breaker for an unknown reason.	Call Schneider Electric field service to replace the control unit.