Monitoring the Tripping Circuit

Presentation

When the MicroLogic X 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 X control unit
The connection of the ENCT (External Neutral Current Transformer)
The connection of the earth-leakage (Vigi) sensor

NOTE: The mechanism is not monitored. It is recommended to perform preventive maintenance as proposed by Schneider Electric. For more information, refer to DOCA0099•• MasterPacT MTZ - IEC Switch-Disconnectors and Circuit Breakers with MicroLogic X Control Unit - Maintenance Guide.

Operating Principle: Ready LED

A Ready LED

The result of the monitoring is indicated by the ready LED on the front face of the MicroLogic X 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:
- Either the MicroLogic X control unit is not energized. Provide power to the control unit with a Mobile Power Pack. If the ready LED is still off, consult the log of active events at Home > Alarms & History > Alarms to diagnose the situation.
- Or there is a detected incident in the tripping circuit. Consult the log of active events at Home > Alarms & History > 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.

Tripping Data and Availability

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

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

The tripping data is available as follows:

With EcoStruxure Power Commission software
On a remote controller using the communication network

Predefined Events

The monitoring of the tripping circuit generates the following events:

Code	Event	History	Severity
0x6407 (25607)	Self diagnostic trip	Trip	High with trip
0x641F (25631)	Circuit breaker self diagnostic trip	Trip	High with trip⁽¹⁾
0x1400 (5120)	Control unit self test major malfunction 1	Diagnostic	High, with trip depending on the malfunction detected
0x1404 (5124)	Control unit self test major malfunction 2	Diagnostic	High, with trip depending on the malfunction detected
0x1405 (5125)	Control unit self test major malfunction 3	Diagnostic	High, with trip depending on the malfunction detected
0x1406 (5126)	Control unit self test major malfunction 4	Diagnostic	High, with trip depending on the malfunction detected
0x1416 (5142)	Control unit self test major malfunction 5	Diagnostic	High, with trip depending on the malfunction detected
0x1402 (5122)	Internal current sensor disconnected	Diagnostic	High with trip
0x1403 (5123)	External neutral current sensor disconnected	Diagnostic	High with trip
0x1430 (5168)	Protection settings reset to factory values	Diagnostic	High
0x1409 (5129)	Unable to read sensor plug	Diagnostic	High
0x1408 (5128)	Earth leakage (Vigi) sensor disconnected	Diagnostic	High
0x1438 (5176)	Main voltage loss and circuit breaker closed	Diagnostic	Medium
(1) The event is used to trip the circuit breaker in case of internal current sensor major malfunction. The user can configure this trip event as an alarm event by using EcoStruxure Power Commission software.

Recommended Actions

Code	Event	Recommended actions
0x6407 (25607)	Self diagnostic trip	Plan to replace the MicroLogic X control unit.
0x641F (25631)	Circuit breaker self diagnostic trip	Replace the circuit breaker.
0x1400 (5120)	Control unit self test major malfunction 1	Plan to replace the MicroLogic X control unit.
0x1404 (5124)	Control unit self test major malfunction 2	Plan to replace the MicroLogic X control unit.
0x1405 (5125)	Control unit self test major malfunction 3	Plan to replace the MicroLogic X control unit.
0x1406 (5126)	Control unit self test major malfunction 4	Plan to replace the MicroLogic X control unit.
0x1416 (5142)	Control unit self test major malfunction 5	Plan to replace the MicroLogic X control unit.
0x1402 (5122)	Internal current sensor disconnected	Plan to replace the MicroLogic X control unit.
0x1403 (5123)	External neutral current sensor disconnected	Check connection of the External Neutral Current Sensor (ENCT).
0x1430 (5168)	Protection settings reset to factory values	Update the MicroLogic X control unit firmware with EcoStruxure Power Commission software. Otherwise, plan to replace the MicroLogic X control unit.
0x1409 (5129)	Unable to read sensor plug	Check connection of the sensor plug and performer plugs. If the connection is good but it fails again, replace the sensor plug or the control unit.
0x1408 (5128)	Earth leakage (Vigi) sensor disconnected	Check the connection of the external earth leakage (Vigi) sensor.
0x1438 (5176)	Main voltage loss and circuit breaker closed	Check main voltage on the busbar.

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 X self-tests, refer to the relevant document:

MasterPacT MTZ1 - Circuit Breakers and Switch-Disconnectors - User Guide
MasterPacT MTZ2/MTZ3 - Circuit Breakers and Switch-Disconnectors - User Guide