Monitoring the Tripping Circuit

Presentation

When the MicroLogic Active control unit is energized, it provides constant monitoring of the following:

The internal tripping circuit
The connection of the internal sensors (internal current transformers, sensor plug, performer plug)
The connection of the circuit breaker tripping voltage release (MITOP) to the MicroLogic Active control unit
The connection of the ENCT (External Neutral Current Transformer)

NOTE: The mechanism is not monitored. It is recommended to perform preventive maintenance as proposed by Schneider Electric. For more information, refer to DOCA0305•• MasterPacT MTZ IEC Circuit Breakers with MicroLogic Active Control Unit - Maintenance Guide.

Operating Principle: Ready LED

Ready LED

The result of the monitoring is indicated by the Ready LED on the front face of the MicroLogic Active control unit, as follows:

The Ready LED is flashing green: the internal tripping circuit of the circuit breaker is functioning correctly.
The Ready LED is off, which indicates one of two scenarios:
- The MicroLogic Active control unit is not energized. In this case, provide power to the control unit with a Mobile Power Pack. If the Ready LED is still off, consult the history of active events on the MicroLogic Active display screen, from the tree navigation menu, at Alarms/History > Active Alarms to diagnose the situation.
- There is a detected incident in the tripping circuit. Consult the history of active events on the MicroLogic Active display screen, from the tree navigation menu, at Alarms/History > Active Alarms to diagnose the situation.

Circuit Breaker Status

Following the detection of an incident in the tripping circuit the circuit breaker may be tripped or not, depending on the type of incident detected.

Unable to Read Sensor Plug

When the MicroLogic Active control unit is unable to read the rated current In from the sensor plug, the event Unable to read sensor plug is generated and the value of the rated current In is forced:

In = 400 A for MasterPacT MTZ1/MTZ2 circuit breaker
In = 800 A for MasterPacT MTZ3 circuit breaker

The protection settings based on the value of In are modified accordingly.

Tripping Data and Availability

The following data about the tripping function is logged by the MicroLogic Active control unit:

Total number of trips
The name and date of the most recent trip

The tripping data is available:

With EcoStruxure Power Commission software.
With EcoStruxure Power Device app through NFC and USB OTG connection.
With the IEEE 802.15.4 wireless communication network for MicroLogic Active AP/EP control units.

Predefined Events

The monitoring of the tripping circuit generates the following events:

Code	Event	History	Severity
0x6407 (25607)	Self diagnostic trip. Replace control unit	Trip	High with trip
0x640A (25610)	ENCT Disconnected trip	Trip	High with trip
0x6433 (25651)	Current sensor loss. Replace Circuit Breaker	Trip	High with trip
0x1400 (5120)	Self test 1. Replace control unit	Diagnostic	High with trip
0x1404 (5124)	Control unit over temperature	Diagnostic	High with trip
0x1405 (5125)	Self test 3. Replace control unit	Diagnostic	High with trip
0x1406 (5126)	Self test 4. Replace control unit	Diagnostic	High with trip
0x1416 (5142)	Mitop disconnected. Call Schneider Electric support	Diagnostic	High with trip
0x1402 (5122)	Current sensor loss. Replace circuit breaker.	Diagnostic	High with trip
0x1403 (5123)	ENCT disconnected	Diagnostic	High with trip
0x1430 (5168)	Protection settings reset to factory values	Diagnostic	High
0x1409 (5129)	Unable to read sensor plug	Diagnostic	High
0x1518 (5400)	Self-test 6. Replace control unit.	Diagnostic	High

Recommended Actions

Code	Event	Recommended actions
0x6407 (25607)	Self diagnostic trip. Replace control unit	Replace the MicroLogic Active control unit. Contact Schneider Electric support.
0x640A (25610)	ENCT Disconnected trip	Check internal/external wiring of External Neutral Current Transformer (ENCT).
0x6433 (25651)	Current sensor loss. Replace Circuit Breaker	Replace the circuit breaker. Contact Schneider Electric support.
0x1400 (5120)	Self test 1. Replace control unit	Replace the MicroLogic Active control unit. Contact Schneider Electric support.
0x1404 (5124)	Control unit over temperature	Decrease ambient temperature near the circuit breaker. If the problem persists, replace the MicroLogic Active control unit.
0x1405 (5125)	Self test 3. Replace control unit	Replace the MicroLogic Active control unit. Contact Schneider Electric support.
0x1406 (5126)	Self test 4. Replace control unit	Replace the MicroLogic Active control unit. Contact Schneider Electric support.
0x1416 (5142)	Mitop disconnected. Call Schneider Electric support	Contact Schneider Electric support before restarting.
0x1402 (5122)	Current sensor loss. Replace circuit breaker.	Replace the circuit breaker. Contact Schneider Electric support.
0x1403 (5123)	ENCT disconnected	Check internal/external wiring of External Neutral Current Transformer (ENCT).
0x1430 (5168)	Protection settings reset to factory values	Update the MicroLogic Active control unit firmware with EcoStruxure Power Commission software. Otherwise, plan to replace the MicroLogic Active control unit.
0x1409 (5129)	Unable to read sensor plug	Check connection of the sensor plug and performer plugs. If the connection is good but the event recurs, replace the sensor plug or the MicroLogic Active control unit.
0x1518 (5400)	Self-test 6. Replace control unit.	Replace the MicroLogic Active control unit. Contact Schneider Electric support.

Contact Schneider Electric Support or your Schneider Electric Services representative for more information about who can carry out the recommended actions.

Resetting a Trip Event

For information about resetting the circuit breaker after a trip due to an incident detected by the MicroLogic Active self-tests, refer to the relevant document:

MasterPacT MTZ1 IEC Circuit Breakers with MicroLogic Active Control Unit - User Guide
MasterPacT MTZ2/MTZ3 IEC Circuit Breakers with MicroLogic Active Control Unit - User Guide