MasterPacT MTZ Trip Units

MicroLogic X is available in 3 trip function types: LI (3.0X), LSI (5.0X) and LSIG (6.0X) as shown below:

• Long-Time setting is adjustable from 40% to 100% of sensor value. A time setting, time delay and thermal memory feature is included.

• Short Time setting is adjustable from 1.5 to 10 times the long-time trip current setting. A time setting and operating time setting are included.

• Instantaneous Trip setting is adjustable from 2 to 15 times the sensor value. Operating time is 50 ms in Standard Trip mode or 30 ms in Fast Trip mode which is an adjustable setting in the trip unit.

• Ground Fault Trip setting is adjustable from 20% of sensor value to 1200 A (30% of sensor value to 400 A for 400 A sensor). A time setting and operating time setting are included.

The MicroLogic X control unit is also equipped with dual protection settings which allow the user to have a second set of protection settings. This allows users to easily switch between settings. A typical application is to adjust the short-circuit protection when an installation can be supplied by two sources (grid / generator set) with different levels of available short circuit current. The settings can be selected by one of the following means:

• MTZ App

• by a digital input through the IO module

• via Ethernet

• from the embedded HMI

Based on the measurement of line currents, neutral current, phase-to-phase voltages and phase-to-neutral voltages, a MicroLogic X control unit calculates and displays parameters required to monitor any AC electrical power system. MasterPacT MTZ device with embedded current sensors and MicroLogic X control unit is a power metering device complying with IEC/EN 61557-12, Class 0.5 accuracy for voltage and current and Class 1 accuracy for active power and energy measurements.

• RMS values of current and voltage

• Active, reactive and apparent power

• Active, reactive and apparent energy

• Power factor

• Frequency

• Phase sequence

• Voltage unbalance, current unbalance

• Current demand

• Total active, reactive and apparent power demand

• THD of voltage and current

For the complete list of measurements and min / max values, see the MicroLogic X User Guide (DOCA0102EN).

The MicroLogic X control unit performs a high level of diagnostics in real time on MasterPacT MTZ circuit breakers. They generate and store appropriate warnings, alarms, and messages to help the users with maintenance and power restoration.

These diagnostics:

• Prevent interruption of the power supply to maintain continuity of operation, preserve assets from damage, and support the safety of personnel.

• Reduce downtime resulting from an unexpected outage in the electrical distribution system by facilitating a restart as quickly as possible after a trip.

• Keep devices in good operating condition and aid qualified personnel when repairs are required.

• Build the history and traceability of all interventions to improve preventive maintenance and secure daily operation.

Monitored Functions and Logs for Circuit Breaker Operation

• XF (shunt close) coil circuit continuity

• MCH (spring charging motor) charging time

• “Time stamped” closing log

• MCH counter

• Alarm fail closing order

• MX (shunt trip)coil circuit continuity

• MN (undervoltage trip) coil circuit continuity

• Opening counter

• “Time stamped”opening log (Electrical/ mechanical)

• Alarm fail opening order

• Tripping chain continuity (Ready LED)

• Trip counter (SDE)

• Time stamped event log with notifications/reset. All events are time stamped and logged in non-volatile memory so they are maintained if control power is lost. (For the complete list of events see the MicroLogic X control unit user guide (DOCA0102EN)

Monitored Functions and Logs Fault Detection on MicroLogic X

• Internal Current Transformers [T]

• External Neutral CT

• ASIC over temp [T]

• ASIC problem [T]

• Error reading perform / Sensor rating

• Internal battery

• Trip solenoid is not connected, default is to trip the circuit breaker

• Bluetooth error

• Ethernet Error communication (IFE)

• IO module

MicroLogic X control units and interfaces offers multiple communication channels:

• Connection to an Ethernet network through either an EIFE or an IFE interface module. The EIFE and IFE modules are connected to the MicroLogic X control unit by means of a ULP port and a prefabricated ULP cord mounted on the cradle of the MTZ breaker.

• Connection to a Modbus SL (RTU) RS 485 bus is through an IFM interface module. The IFM module is connected to the MicroLogic X control unit by means of a ULP port and a prefabricated ULP cord installed in the MTZ breaker cell within the switchgear

• Communication with a smartphone via a wireless powered Bluetooth channel or a self-powered NFC channel.

  NOTE: Specifying the MicroLogic Xi version of the trip unit removes the wireless features.

• Communication with a PC via a USB port.

• Connection to Internet-based servers or cloud platform. The connection to Internet can be performed through a Panel Server module connected to internal Ethernet network.

The figure below illustrates the connectivity capability of the MasterPacT MTZ with MicroLogic X trip unit. See MasterPacT MTZ MicroLogic X Control Unit User Guide (DOCA0102EN) for more information.

The following control orders, information and data, are made available on Ethernet and Modbus SL (RTU):

Control orders:

• MX diag & com shunt trip opening order

• XF diag & com shunt close closing order

Events:

• All the events logged in the MicroLogic X control unit event logbooks

Status indications:

• ON/OFF O/F

• Spring charged CH

• Ready to close

• Overcurrent trip SDE

• Connected / disconnected / test position CE/CD/CT

Measurements:

• Instantaneous measurement information

• Averaged measurement information

• Max/Min values

• Energy metering

• Power quality

Operating assistance:

• Protection settings and alarm

• Histories

• Maintenance indicators

Availability:

• Access control by password, to be initialized by the user

See Communications Options in Power-Zone 4 Switchgear section of this catalog for communication configurations available for MasterPacT within Power-Zone 4 LV Switchgear.

The basic functions of protection performed by the MicroLogic X control unit (LSIG: long-time overload protection, short-time short-circuit protection, instantaneous short-circuit protection, ground-fault protection) do not require an external power supply. They are self-powered by the currents delivered by the current transformers embedded in the MTZ circuit breaker.

In Power-Zone 4 LV Switchgear standard control schemes provide 24 Vdc power to the trip unit via main (lineside) voltage taps or (optionally) a user supplied voltage.

• The MicroLogic X HMI and display screen.

• The metering functions with accuracies in accordance with IEC 61557-12.

• The maintenance and diagnostic functions.

• Communication through Bluetooth low energy technology.

• Communication through ULP modules below:

  • The IFE module.

  • The IFM module.

  • The IO module.

  • The M2C programmable contact.

  • The ESM - ERMS switch module.

  • The optional protections provided by the optional digital modules.

The 24 Vdc power supply maintains the operation of all functions of the MicroLogic X control unit in all circumstances, even when the circuit breaker is open and not energized. The 24 Vdc power supply maintains the functions of the MicroLogic X control unit in low load conditions (load below 20%).

More information on Micrologic X trip unit functions and power supply requirements can be found in MasterPact MTZ MicroLogic X Control Unit User Guide (DOCA0102EN).